Filed Pursuant to Rule 497
File No. 333-193308

PROSPECTUS SUPPLEMENT
(to Prospectus dated April 13, 2016)

1,750,000 Shares

GOLUB CAPITAL BDC, INC.

Common Stock
$18.35 per share

We are an externally managed, closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the Investment Company Act of 1940, as amended, or the 1940 Act. Our investment objective is to generate current income and capital appreciation by investing primarily in senior secured and one stop loans of U.S. middle-market companies. We may also selectively invest in second lien and subordinated loans of, and warrants and minority equity securities in U.S. middle-market companies.

GC Advisors LLC serves as our investment adviser. Golub Capital LLC serves as our administrator. GC Advisors LLC and Golub Capital LLC are affiliated with Golub Capital (as defined herein), a leading lender to middle-market companies with over $18.0 billion in capital under management as of June 30, 2016.

All of the 1,750,000 shares of common stock offered by this prospectus supplement are being sold by us. Our common stock is traded on the NASDAQ Global Select Market under the symbol “GBDC”. Mr. John T. Baily, one of our directors, has agreed to purchase an aggregate of 8,250 shares in this offering at the public offering price per share. The last reported closing price for our common stock on August 15, 2016 was $18.72 per share. The net asset value of our common stock as of June 30, 2016 (the last date prior to the date of this prospectus supplement on which we determined net asset value) was $15.88 per share. The offering price per share of our common stock less any underwriting commissions or discounts will not be less than the net asset value per share of our common stock at the time we make this offering.

Shares of closed-end investment companies, including business development companies, frequently trade at a discount to their net asset value. If our shares trade at a discount to our net asset value, it will likely increase the risk of loss for purchasers in this offering. Investing in our common stock involves a high degree of risk. Before buying any common stock, you should read the discussion of the material risks of investing in our common stock, including the risk of leverage, in “Risk Factors” beginning on page 15 of the accompanying prospectus.

This prospectus supplement and the accompanying prospectus contain important information you should know before investing in our common stock. Please read it before you invest and keep it for future reference. We file annual, quarterly and current reports, proxy statements and other information about us with the Securities and Exchange Commission, or the SEC. We maintain a website at http://www.golubcapitalbdc.com and make all of our annual, quarterly and current reports, proxy statements and other publicly filed information available on or through our website. You may also obtain such information, free of charge, and make shareholder inquiries by contacting us at 150 South Wacker Drive, Suite 800, Chicago, Illinois 60606, Attention: Investor Relations, or by calling us collect at (312) 205-5050. The SEC also maintains a website at http://www.sec.gov that contains such information.

We generally invest in securities that have been rated below investment grade by independent rating agencies or that would be rated below investment grade if they were rated. These securities, which may be referred to as “junk,” have predominantly speculative characteristics with respect to the issuer’s capacity to pay interest and repay principal. In addition, many of our debt investments have floating interest rates that reset on a periodic basis and typically do not fully pay down principal prior to maturity, which may increase our risk of losing part or all of our investment.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

   
  Per Share   Total
Public offering price   $ 18.35     $ 32,112,500  
Sales load (underwriting discounts and commissions)   $ 0.57     $ 997,500  
Proceeds to us (before expenses)   $ 17.78     $ 31,115,000  

In addition, the underwriter may purchase up to an additional 262,500 shares of common stock at the public offering price, less the sales load payable by us, within 30 days from the date of this prospectus supplement. If the underwriter exercises this option in full, the total sales load paid by us will be $1,147,125, and total proceeds to us, before expenses, will be $35,782,250.

The underwriter is offering the common stock as set forth in “Underwriting.” Delivery of the common stock will be made on or about August 19, 2016.

Wells Fargo Securities

The date of this prospectus supplement is August 15, 2016.


 
 

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ABOUT THIS PROSPECTUS SUPPLEMENT

You should rely only on the information contained in this prospectus supplement and the accompanying prospectus. We have not, and the underwriter has not, authorized any other person to provide you with different information. We are not, and the underwriter is not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus supplement is accurate only as of the date on the front cover of this prospectus supplement and that the information appearing in the accompanying prospectus is accurate only as of the date on its front cover. Our business, financial condition, results of operations, cash flows and prospects may have changed since that date. We will update these documents to reflect material changes only as required by law. We are offering to sell, and seeking offers to buy, securities only in jurisdictions where offers are permitted.

This document is in two parts. The first part is this prospectus supplement, which describes the terms of this offering and also adds to and updates information contained in the accompanying prospectus. The second part is the accompanying prospectus, which gives more general information and disclosure. To the extent the information contained in this prospectus supplement differs from the information contained in the accompanying prospectus, the information in this prospectus supplement will control. You should read this prospectus supplement and the accompanying prospectus together with the additional information described under the headings, “Risk Factors” included in the accompanying prospectus and “Available Information” included in this prospectus supplement before investing in our common stock.


 
 

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TABLE OF CONTENTS
PROSPECTUS SUPPLEMENT

 
  Page
PROSPECTUS SUPPLEMENT SUMMARY     S-1  
THE OFFERING     S-9  
FEES AND EXPENSES     S-11  
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS     S-16  
USE OF PROCEEDS     S-18  
CAPITALIZATION     S-19  
SELECTED CONSOLIDATED FINANCIAL DATA     S-20  
INTERIM MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION, RESULTS OF OPERATIONS AND CASH FLOWS     S-22  
PRICE RANGE OF COMMON STOCK     S-51  
UNDERWRITING     S-52  
LEGAL MATTERS     S-56  
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM     S-56  
AVAILABLE INFORMATION     S-56  
INDEX TO FINANCIAL STATEMENTS     SF-1  

PROSPECTUS

 
PROSPECTUS SUMMARY     1  
FEES AND EXPENSES     10  
RISK FACTORS     15  
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS     45  
USE OF PROCEEDS     46  
DISTRIBUTIONS     47  
SELECTED CONSOLIDATED FINANCIAL DATA     48  
MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION, RESULTS OF OPERATIONS AND CASH FLOWS     50  
PRICE RANGE OF COMMON STOCK     94  
THE COMPANY     95  
PORTFOLIO COMPANIES     105  
MANAGEMENT     122  
MANAGEMENT AGREEMENTS     132  
RELATED PARTY TRANSACTIONS AND CERTAIN RELATIONSHIPS     141  
CONTROL PERSONS AND PRINCIPAL STOCKHOLDERS     144  
DETERMINATION OF NET ASSET VALUE     146  
DIVIDEND REINVESTMENT PLAN     149  
MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS     151  
DESCRIPTION OF OUR CAPITAL STOCK     158  
DESCRIPTION OF OUR PREFERRED STOCK     163  
DESCRIPTION OF OUR SUBSCRIPTION RIGHTS     164  

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DESCRIPTION OF WARRANTS     166  
DESCRIPTION OF OUR DEBT SECURITIES     168  
REGULATION     179  
CUSTODIAN, TRANSFER AND DIVIDEND PAYING AGENT AND REGISTRAR     185  
BROKERAGE ALLOCATION AND OTHER PRACTICES     185  
PLAN OF DISTRIBUTION     186  
LEGAL MATTERS     188  
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM     188  
AVAILABLE INFORMATION     188  
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS     F-1  

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PROSPECTUS SUPPLEMENT SUMMARY

This summary highlights some of the information in this prospectus supplement and the accompanying prospectus. It is not complete and may not contain all of the information that you may want to consider. You should read the more detailed information set forth under “Risk Factors” included in the accompanying prospectus and the other information included in this prospectus supplement and the accompanying prospectus carefully.

Except as otherwise indicated, the terms:

“we,” “us,” “our” and “Golub Capital BDC” refer to Golub Capital BDC, Inc., a Delaware corporation, and its consolidated subsidiaries;
“Holdings” refers to Golub Capital BDC 2010-1 Holdings LLC, a Delaware limited liability company, or LLC, our direct subsidiary;
“2010 Issuer” refers to Golub Capital BDC 2010-1 LLC, a Delaware LLC, a direct subsidiary of Holdings and our indirect subsidiary;
“2014 Issuer” refers to Golub Capital BDC CLO 2014 LLC, a Delaware LLC, our direct subsidiary;
“2010 Debt Securitization” refers to the $350.0 million term debt securitization that we completed on July 16, 2010, as most recently amended on June 25, 2015, in which the 2010 Issuer issued an aggregate of $350.0 million of notes, or the 2010 Notes, including $203.0 million of Class A 2010 Notes, which bear interest at a rate of three-month London Interbank Offered Rate, or LIBOR, plus 1.74%, $12.0 million of Class B 2010 Notes, which bear interest at a rate of three-month LIBOR plus 2.40%, and $135.0 million face amount of Subordinated 2010 Notes that do not bear interest;
“2014 Debt Securitization” refers to the $402.6 million term debt securitization that we completed on June 5, 2014, in which the 2014 Issuer issued an aggregate of $402.6 million of notes, or the 2014 Notes, including $191.0 million of Class A-1 2014 Notes, which bear interest at a rate of three-month LIBOR plus 1.75%, $20.0 million of Class A-2 2014 Notes, which bear interest at a rate of three-month LIBOR plus 1.45% through December 4, 2015 and three-month LIBOR plus 1.95% thereafter, $35.0 million of Class B 2014 Notes, which bear interest at a rate of three-month LIBOR plus 2.50%, $37.5 million of Class C 2014 Notes, which bear interest at a rate of three-month LIBOR plus 3.50%, and $119.1 million of LLC equity interests that do not bear interest;
“Funding” refers to Golub Capital BDC Funding, LLC, a Delaware LLC, our direct subsidiary;
“Credit Facility” refers to the amended and restated senior secured revolving credit facility that Funding originally entered into on July 21, 2011, as most recently amended on March 1, 2016, with Wells Fargo Securities, LLC, as administrative agent, and Wells Fargo Bank, N.A., as lender and collateral agent, that currently allows for borrowing up to $200 million and that bears interest at a rate of one-month LIBOR plus 2.25% per annum through the reinvestment period, which ends July 29, 2017, and bears interest at a rate of one-month LIBOR plus 2.75% for the period following the reinvestment period through the stated maturity date of July 30, 2020;
“SLF” refers to Senior Loan Fund LLC, an unconsolidated Delaware LLC, in which we co-invest with RGA Reinsurance Company, or RGA, primarily in senior secured loans. SLF is capitalized as transactions are completed and all portfolio and investment decisions in respect of SLF must be approved by representatives of each of the members (with unanimous approval required from either (i) one representative of each of us and RGA or (ii) both representatives of each of us and RGA currently). As of June 30, 2016, we owned 87.5% of both the outstanding subordinated notes and LLC equity interests of SLF. As of June 30, 2016, SLF had subordinated note commitments from its members totaling $160.0 million and LLC equity interest subscriptions from its members totaling $40.0 million. We have committed to fund $140.0 million of subordinated notes and $35.0 million of LLC equity interest subscriptions to SLF;

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“GC Advisors” refers to GC Advisors LLC, a Delaware LLC, our investment adviser;
“Administrator” refers to Golub Capital LLC, a Delaware LLC, an affiliate of GC Advisors and our administrator and, for periods prior to February 5, 2013, GC Service Company, LLC; and
“Golub Capital” refers, collectively, to the activities and operations of Golub Capital Incorporated, Golub Capital LLC (formerly Golub Capital Management LLC), which entity employs all of Golub Capital’s investment professionals, GC Advisors and associated investment funds and their respective affiliates.

Golub Capital BDC

We are an externally managed, closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the 1940 Act. In addition, for U.S. federal income tax purposes, we have elected to be treated as a regulated investment company, or RIC, under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. We were formed in November 2009 to continue and expand the business of our predecessor, Golub Capital Master Funding LLC, which commenced operations in July 2007, to make investments primarily in senior secured, one stop (a loan that combines characteristics of traditional first lien senior secured loans and second lien or subordinated loans), second lien and subordinated (a loan that ranks senior only to a borrower’s equity securities and ranks junior to all of such borrower’s other indebtedness in priority of payment) loans of, and warrants and minority equity securities in, U.S. middle-market companies that are, in most cases, sponsored by private equity firms. We structure one stop loans as senior secured loans, and we obtain security interests in the assets of the portfolio company that serve as collateral in support of the repayment of these loans. This collateral may take the form of first-priority liens on the assets of the portfolio company. In many cases, we, together with our affiliates, are the sole lenders of one stop loans, which can afford us additional influence over the borrower in terms of monitoring and, if necessary, remediation in the event of underperformance. In this prospectus supplement, the term “middle-market” generally refers to companies having earnings before interest, taxes, depreciation and amortization, or EBITDA, of between $10.0 million and $50.0 million annually.

Our investment objective is to generate current income and capital appreciation by investing primarily in senior secured and one stop loans of U.S. middle-market companies. We may also selectively invest in second lien and subordinated loans of, and warrants and minority equity securities in U.S. middle-market companies. We intend to achieve our investment objective by (1) accessing the established loan origination channels developed by Golub Capital, a leading lender to middle-market companies with over $18.0 billion in capital under management as of June 30, 2016, (2) selecting investments within our core middle-market company focus, (3) partnering with experienced private equity firms, or sponsors, in many cases with whom Golub Capital has invested alongside in the past, (4) implementing the disciplined underwriting standards of Golub Capital and (5) drawing upon the aggregate experience and resources of Golub Capital.

We seek to create a portfolio that includes primarily senior secured and one stop loans by primarily investing approximately $5.0 million to $30.0 million of capital, on average, in the securities of U.S. middle-market companies. We may also selectively invest more than $30.0 million in some of our portfolio companies and generally expect that the size of our individual investments will vary proportionately with the size of our capital base.

We generally invest in securities that have been rated below investment grade by independent rating agencies or that would be rated below investment grade if they were rated. These securities, which may be referred to as “junk,” have predominantly speculative characteristics with respect to the issuer’s capacity to pay interest and repay principal. In addition, many of our debt investments have floating interest rates that reset on a periodic basis and typically do not fully pay down principal prior to maturity, which may increase our risk of losing part or all of our investment.

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As of June 30, 2016 and September 30, 2015, our portfolio at fair value was comprised of the following:

       
  As of June 30, 2016   As of September 30, 2015
Investment Type   Investments at
Fair Value
(In thousands)
  Percentage
of Total
Investments
  Investments at
Fair Value
(In thousands)
  Percentage
of Total
Investments
Senior secured   $ 174,608       10.7 %    $ 197,329       12.9 % 
One stop     1,235,496       75.9       1,134,222       74.1  
Second lien     37,461       2.3       39,774       2.6  
Subordinated debt     1,966       0.1       1,715       0.1  
Subordinated notes in SLF(1)     81,292       5.0       76,563       5.0  
LLC equity interests in SLF(1)     29,772       1.8       22,373       1.5  
Equity     67,914       4.2       57,808       3.8  
Total   $ 1,628,509       100.0 %    $ 1,529,784       100.0 % 

(1) SLF’s proceeds from the subordinated notes and LLC equity interests invested in SLF were utilized by SLF to invest in senior secured loans.

One stop loans include loans to technology companies undergoing strong growth due to new services, increased adoption and/or entry into new markets. We refer to loans to these companies as late stage lending loans. Other targeted characteristics of late stage lending businesses include strong customer revenue retention rates, a diversified customer base and backing from growth equity or venture capital firms. In some cases, the borrower’s high revenue growth is supported by a high level of discretionary spending. As part of the underwriting of such loans and consistent with industry practice, we may adjust our characterization of the earnings of such borrowers for a reduction or elimination of such discretionary expenses, if appropriate. As of June 30, 2016 and September 30, 2015, one stop loans included $109.9 million and $88.2 million, respectively, of late stage lending loans at fair value.

As of June 30, 2016 and September 30, 2015, we had debt and equity investments in 185 and 164 portfolio companies, respectively, and investments in subordinated notes and LLC equity interests in SLF. The weighted average annualized income yield and weighted average annualized investment income yield of our income producing debt investments, which represented nearly 100% of our debt investments, for the three and nine months ended June 30, 2016 and 2015 was as follows:

       
  For the three months
ended June 30,
  For the nine months
ended June 30,
     2016   2015   2016   2015
Weighted average annualized income yield(1)     7.6 %      7.6 %      7.6 %      7.7 % 
Weighted average annualized investment income yield(2)     8.2 %      8.4 %      8.1 %      8.3 % 

(1) Represents income from interest, including subordinated notes in SLF, and fees excluding amortization of capitalized fees and discounts divided by the average fair value of earning debt investments.
(2) Represents income from interest, including subordinated notes in SLF, fees and amortization of capitalized fees and discounts divided by the average fair value of earning debt investments.

As of June 30, 2016 and September 30, 2015, we and RGA owned 87.5% and 12.5%, respectively, of both the outstanding subordinated notes and LLC equity interests of SLF. Additionally, on January 17, 2014, Senior Loan Fund II LLC, a wholly-owned subsidiary of SLF, or SLF II, entered into a senior secured revolving credit facility, or the SLF Credit Facility, with Wells Fargo Securities, LLC, as administrative agent, and Wells Fargo Bank, N.A., as lender, which, as amended, allows SLF II to borrow up to $300.0 million, subject to leverage and borrowing base restrictions. The reinvestment period of the SLF Credit Facility ends May 12, 2017, and the stated maturity date is May 13, 2020. As of June 30, 2016 and September 30, 2015, SLF had subordinated note commitments from its members totaling $160.0 million, of which approximately $93.8 million and $87.5 million in aggregate principal amount was funded as of June 30, 2016 and September 30, 2015, respectively. As of June 30, 2016 and September 30, 2015, SLF had LLC equity interest subscriptions from its members totaling $40.0 million, of which approximately $35.8 million and

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$26.5 million in aggregate was called and contributed as of June 30, 2016 and September 30, 2015, respectively. Our investment in SLF is not a qualifying asset under Section 55(a) of the 1940 Act. Under the 1940 Act, we may not acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of our total assets.

Our Adviser

Our investment activities are managed by our investment adviser, GC Advisors. GC Advisors is responsible for sourcing potential investments, conducting research and due diligence on prospective investments and equity sponsors, analyzing investment opportunities, structuring our investments and monitoring our investments and portfolio companies on an ongoing basis. GC Advisors was organized in September 2008 and is a registered investment adviser under the Investment Advisers Act of 1940, as amended, or the Advisers Act. Under our amended and restated investment advisory agreement, or the Investment Advisory Agreement, with GC Advisors, we pay GC Advisors a base management fee and an incentive fee for its services. See “Management Agreements — Investment Advisory Agreement —  Management Fee” in the accompanying prospectus for a discussion of the base management fee and incentive fee, including the cumulative income incentive fee and the income and capital gains incentive fee, payable by us to GC Advisors. Unlike most closed-end funds whose fees are based on assets net of leverage, our base management fee is based on our average-adjusted gross assets (including leverage but adjusted to exclude cash and cash equivalents so that investors do not pay the base management fee on such assets) and, therefore, GC Advisors benefits when we incur debt or use leverage. For purposes of the Investment Advisory Agreement, cash equivalents means U.S. government securities and commercial paper instruments maturing within 270 days of purchase. Additionally, under the incentive fee structure, GC Advisors benefits when capital gains are recognized and, because it determines when a holding is sold, GC Advisors controls the timing of the recognition of capital gains. Our board of directors is charged with protecting our interests by monitoring how GC Advisors addresses these and other conflicts of interest associated with its management services and compensation. While not expected to review or approve each borrowing, our independent directors periodically review GC Advisors’ services and fees as well as its portfolio management decisions and portfolio performance. In connection with these reviews, our independent directors consider whether our fees and expenses (including those related to leverage) remain appropriate. See “Management Agreements —  Investment Advisory Agreement — Board Approval of the Investment Advisory Agreement” in the accompanying prospectus.

GC Advisors is an affiliate of Golub Capital and pursuant to a staffing agreement, or the Staffing Agreement, Golub Capital LLC makes experienced investment professionals available to GC Advisors and provides access to the senior investment personnel of Golub Capital LLC and its affiliates. The Staffing Agreement provides GC Advisors with access to investment opportunities, which we refer to in the aggregate as deal flow, generated by Golub Capital LLC and its affiliates in the ordinary course of their businesses and commits the members of GC Advisors’ investment committee to serve in that capacity. As our investment adviser, GC Advisors is obligated to allocate investment opportunities among us and its other clients fairly and equitably over time in accordance with its allocation policy. See “— Conflicts of Interest” below and “Related Party Transactions and Certain Relationships” in the accompanying prospectus. However, there can be no assurance that such opportunities will be allocated to us fairly or equitably in the short-term or over time. GC Advisors seeks to capitalize on the significant deal origination, credit underwriting, due diligence, investment structuring, execution, portfolio management and monitoring experience of Golub Capital LLC’s investment professionals.

An affiliate of GC Advisors, the Administrator, provides the administrative services necessary for us to operate. See “Management Agreements — Administration Agreement” in the accompanying prospectus for a discussion of the fees and expenses (subject to the review and approval of our independent directors) we are required to reimburse to the Administrator.

About Golub Capital

Golub Capital, founded in 1994, is a leading lender to middle-market companies, with a long track record of investing in senior secured, one stop, second lien and subordinated loans. As of June 30, 2016, Golub Capital managed over $13.1 billion of invested or available capital for senior secured, one stop, second lien

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and subordinated loan investments in middle-market companies. Since its inception, Golub Capital has closed deals with over 200 middle-market sponsors and repeat transactions with over 130 sponsors.

Golub Capital’s middle-market lending group is managed by a four-member senior management team consisting of Lawrence E. Golub, David B. Golub, Andrew H. Steuerman and Gregory W. Cashman. As of June 30, 2016, Golub Capital’s more than 90 investment professionals had an average of over 12 years of investment experience and were supported by more than 185 administrative and back office personnel that focus on operations, finance, legal and compliance, accounting and reporting, marketing, information technology and office management.

Market Trends

We have identified the following trends that may affect our business:

Target Market.  We believe that small and middle-market companies in the United States with annual revenues between $10.0 million and $2.5 billion represent a significant growth segment of the U.S. economy and often require substantial capital investments to grow. Middle-market companies have generated a significant number of investment opportunities for investment funds managed or advised by Golub Capital, and we believe that this market segment will continue to produce significant investment opportunities for us.

Specialized Lending Requirements.  We believe that several factors render many U.S. financial institutions ill-suited to lend to U.S. middle-market companies. For example, based on the experience of our management team, lending to U.S. middle-market companies (1) is generally more labor intensive than lending to larger companies due to the smaller size of each investment and the fragmented nature of information for such companies, (2) requires due diligence and underwriting practices consistent with the demands and economic limitations of the middle market and (3) may also require more extensive ongoing monitoring by the lender.

Demand for Debt Capital.  We believe there is a large pool of uninvested private equity capital for middle-market companies. We expect private equity firms will seek to leverage their investments by combining equity capital with senior secured loans and subordinated debt from other sources, such as us.

Competition from Bank Lenders.  We believe that many commercial and investment banks have, in recent years, de-emphasized their service and product offerings to middle-market businesses in favor of lending to large corporate clients and managing capital markets transactions. In addition, these lenders may be constrained in their ability to underwrite and hold bank loans for middle-market issuers as they seek to meet existing and future regulatory capital requirements. We believe these factors may result in opportunities for alternative funding sources to middle-market companies and therefore more market opportunities for us.

Market Environment.  We believe that as part of the path of economic recovery following the credit crisis, there has been increased competition for new middle-market investments due to some new non-bank finance companies that have entered the market and due to improving financial performance of middle-market companies. However, we believe that our scale and strong market position will continue to allow us to find investment opportunities with attractive risk-adjusted returns.

Competitive Strengths

Deep, Experienced Management Team.  We are managed by GC Advisors, which, as of June 30, 2016, had access through the Staffing Agreement to the resources and expertise of Golub Capital’s more than 280 employees, led by our chairman, Lawrence E. Golub, and our chief executive officer, David B. Golub. As of June 30, 2016, the more than 90 investment professionals of Golub Capital had an average of over 12 years of investment experience and were supported by more than 185 administrative and back office personnel that focus on operations, finance, legal and compliance, accounting and reporting, marketing, information technology and office management. Golub Capital seeks to hire and retain high-quality investment professionals and reward those personnel based on investor returns.

Leading U.S. Debt Platform Provides Access to Proprietary Relationship-Based Deal Flow.  GC Advisors gives us access to the deal flow of Golub Capital, one of the leading middle-market lenders in the United States. Golub Capital has been ranked a top 3 Traditional Middle Market Bookrunner each year from 2008 through 2Q 2016 by Thomson Reuters LPC for senior secured loans of up to $500.0 million for leveraged buyouts (based on

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number of deals completed). Since its inception, Golub Capital has closed deals with over 200 middle-market sponsors and repeat transactions with over 130 sponsors. We believe that Golub Capital receives relationship-based “early looks” and “last looks” at many investment opportunities in the U.S. middle-market market, allowing it to be highly selective in the transactions it pursues.

Disciplined Investment and Underwriting Process.  GC Advisors utilizes the established investment process of Golub Capital for reviewing lending opportunities, structuring transactions and monitoring investments. Using its disciplined approach to lending, GC Advisors seeks to minimize credit losses through effective underwriting, comprehensive due diligence investigations, structuring and the implementation of restrictive debt covenants.

Regimented Credit Monitoring.  Following each investment, GC Advisors implements a regimented credit monitoring system. This careful approach, which involves ongoing review and analysis by teams of professionals, has enabled GC Advisors to identify problems early and to assist borrowers before they face difficult liquidity constraints.

Concentrated Middle-Market Focus.  Because of our focus on the middle-market, we understand the following general characteristics of middle-market lending:

middle-market companies are generally less leveraged than large companies and, we believe, offer more attractive investment returns in the form of upfront fees, prepayment penalties and higher interest rates;
middle-market issuers are more likely to have simple capital structures;
carefully structured covenant packages enable middle-market lenders to take early action to remediate poor financial performance; and
middle-market lenders can undertake thorough due diligence investigations prior to investment.

Operating and Regulatory Structure

Our investment activities are managed by GC Advisors and supervised by our board of directors, a majority of whom are independent of us, GC Advisors and its affiliates.

As a business development company, we are required to comply with certain regulatory requirements. For example, while we are permitted to finance investments using leverage, which may include the issuance of shares of preferred stock, or notes and other borrowings, our ability to use leverage is limited in significant respects. See “Regulation” in the accompanying prospectus. Any decision on our part to use leverage will depend upon our assessment of the attractiveness of available investment opportunities in relation to the costs and perceived risks of such leverage. GC Advisors makes recommendations to our board of directors with respect to leverage policies. Our board of directors determines our leverage policy, including approving in advance the incurrence of material indebtedness and the execution of material contracts, and directs GC Advisors to implement such policies. The use of leverage to finance investments creates certain risks and potential conflicts of interest. See “Risk Factors — Risks Relating to our Business and Structure — There are significant potential conflicts of interest that could affect our investment returns — Our management and incentive fee structure may create incentives for GC Advisors that are not fully aligned with the interests of our stockholders and may induce GC Advisors to make certain investments, including speculative investments,” “— Risks Relating to our Business and Structure — Regulations governing our operation as a business development company affect our ability to, and the way in which we, raise additional capital. As a business development company, the necessity of raising additional capital exposes us to risks, including the typical risks associated with leverage” and “— Risks Relating to our Business and Structure — We intend to finance our investments with borrowed money, which will magnify the potential for gain or loss on amounts invested and may increase the risk of investing in us” in the accompanying prospectus.

Also, as a business development company, we are generally prohibited from acquiring assets other than “qualifying assets” unless, after giving effect to any acquisition, at least 70% of our total assets are qualifying assets. Qualifying assets generally include securities of “eligible portfolio companies,” cash, cash equivalents, U.S. government securities and high-quality debt investments maturing in one year or less from the time of investment. Under the 1940 Act and the rules thereunder, “eligible portfolio companies” include (1) private

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domestic operating companies, (2) public domestic operating companies whose securities are not listed on a national securities exchange (e.g., the New York Stock Exchange, NYSE MKT LLC and The NASDAQ Stock Market) or registered under the Securities Exchange Act of 1934, as amended, or the Exchange Act, and (3) public domestic operating companies having a market capitalization of less than $250.0 million. Public domestic operating companies whose securities are quoted on the over-the-counter bulletin board and through Pink Sheets LLC are not listed on a national securities exchange and therefore are eligible portfolio companies. See “Regulation” in the accompanying prospectus.

Conflicts of Interest

Subject to certain 1940 Act restrictions on co-investments with affiliates, GC Advisors offers us the right to participate in all investment opportunities that it determines are appropriate for us in view of our investment objective, positions, policies, strategies and restrictions as well as regulatory requirements and other relevant factors. Such offers are subject to the exception that, in accordance with GC Advisors’ code of ethics and allocation policies, we might not participate in each individual opportunity but will, on an overall basis, be entitled to participate equitably with other entities sponsored or managed by GC Advisors and its affiliates.

To the extent that we compete with entities sponsored or managed by GC Advisors or its affiliates for a particular investment opportunity, GC Advisors will allocate investment opportunities across the entities for which such opportunities are appropriate, consistent with (1) its internal conflict of interest and allocation policies, (2) the requirements of the Advisers Act and (3) certain restrictions under the 1940 Act regarding co-investments with affiliates. GC Advisors’ allocation policies are intended to ensure that, over time, we may generally share equitably in investment opportunities with other investment funds, accounts or other investment vehicles, together referred to as accounts, sponsored or managed by GC Advisors or its affiliates, particularly those involving a security with limited supply or involving differing classes of securities of the same issuer which may be suitable for us and such other accounts.

GC Advisors and its affiliates have other clients with similar or competing investment objectives, including several private funds that are pursuing an investment strategy similar to ours, some of which are continuing to seek new capital commitments. In serving these clients, GC Advisors may have obligations to other clients or investors in those entities. Our investment objective may overlap with such affiliated accounts. GC Advisors’ allocation procedures are designed to allocate investment opportunities among the accounts sponsored or managed by GC Advisors and its affiliates in a manner consistent with its obligations under the Advisers Act. If two or more accounts with similar investment strategies are actively investing, GC Advisors will seek to allocate investment opportunities among eligible accounts in a manner that is fair and equitable over time and consistent with its allocation policy. GC Advisors has put in place a conflict-resolution policy that addresses the co-investment restrictions set forth under the 1940 Act. See “Risk Factors — Risks Relating to our Business and Structure — There are significant potential conflicts of interest that could affect our investment returns — Conflicts related to obligations GC Advisors’ investment committee, GC Advisors or its affiliates have to other clients” in the accompanying prospectus.

GC Advisors seeks to ensure the equitable allocation of investment opportunities when we are able to invest alongside other accounts sponsored or managed by GC Advisors and its affiliates. When we invest alongside such other accounts, such investments are made consistent with GC Advisors’ allocation policy. Under this allocation policy, if an investment opportunity is appropriate for us and another similar eligible account, the opportunity will be allocated pro rata based on the relative capital available for investment of each of us and such other eligible accounts, subject to minimum and maximum investment size limits. In situations in which co-investment with other entities sponsored or managed by GC Advisors or its affiliates is not permitted or appropriate, such as when, in the absence of exemptive relief described below, we and such other entities would be making different investments in the same issuer, GC Advisors will need to decide whether we or such other entity or entities will proceed with the investment. GC Advisors will make these determinations based on its policies and procedures, which generally require that such opportunities be offered to eligible accounts on a basis that will be fair and equitable over time, including, for example, through random or rotational methods. We and GC Advisors have submitted an exemptive application to the SEC to permit greater flexibility to negotiate the terms of co-investments if our board of directors determines that it would be advantageous for us to co-invest with other accounts sponsored or managed by GC Advisors or its

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affiliates in a manner consistent with our investment objectives, positions, policies, strategies and restrictions as well as regulatory requirements and other pertinent factors. Our board of directors regularly reviews the allocation policy of Golub Capital and annually reviews the code of ethics of GC Advisors. See “Related Party Transactions and Certain Relationships” in the accompanying prospectus.

Additionally, under our incentive fee structure, GC Advisors benefits when we recognize capital gains and, because GC Advisors determines when a holding is sold, GC Advisors controls the timing of the recognition of such capital gains. See “Risk Factors — Risks Relating to our Business and Structure — There are significant potential conflicts of interest that could affect our investment returns — Our management and incentive fee structure may create incentives for GC Advisors that are not fully aligned with the interests of our stockholders and may induce GC Advisors to make certain investments, including speculative investments” in the accompanying prospectus. In addition, because the base management fee that we pay to GC Advisors is based on our average adjusted gross assets, including those assets acquired through the use of leverage, GC Advisors has a financial incentive to incur leverage.

Recent Developments

On July 18, 2016, the Company entered into a Securities Purchase Agreement between the Company and an institutional investor for the sale of 1,433,486 shares of the Company’s common stock at a price per share of $17.44. Proceeds in cash of $25.0 million were received and the transaction closed on July 21, 2016.

On August 3, 2016, our board of directors declared a quarterly distribution of $0.32 per share payable on September 29, 2016 to holders of record as of September 5, 2016.

**********

Our principal executive offices are located at 150 South Wacker Drive, Suite 800, Chicago, Illinois 60606, and our telephone number is (312) 205-5050. Our corporate website is located at www.golubcapitalbdc.com. Information on our website is not incorporated into or a part of this prospectus supplement.

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THE OFFERING

Common Stock Offered by Us    
    1,750,000 shares, excluding 262,500 shares issuable pursuant to the option granted to the underwriter.
Common Stock to be Outstanding After this Offering    
    54,806,811 shares, excluding shares issuable pursuant to the option granted to the underwriter.
Use of Proceeds    
    We intend to use the net proceeds from the sale of our common stock to invest in portfolio companies in accordance with our investment objective and strategies and for general corporate purposes. We expect that our new investments will consist primarily of senior secured and one stop loans. We will also pay operating expenses, including management and administrative fees, and may pay other expenses such as due diligence expenses relating to potential new investments, from the net proceeds of this offering. A portion of the net proceeds may be utilized to capitalize SLF. A portion of the net proceeds may also be used to capitalize GC SBIC V, L.P., or SBIC V, our small business investment company, or SBIC, subsidiary, following which we expect SBIC V to issue debentures guaranteed by the Small Business Administration, or SBA, and make investments in accordance with our investment strategy. We may also use a portion of the net proceeds from this offering to repay amounts outstanding under our Credit Facility, which bore an annual interest rate of 2.72% (i.e., one-month LIBOR plus 2.25% per annum) on the outstanding balance of $146.1 million as of June 30, 2016 and matures on July 30, 2020. See “Use of Proceeds” in this prospectus supplement for more information.
NASDAQ Global Select Market Symbol    
    “GBDC”
Trading at a Discount    
    Shares of closed-end investment companies, including business development companies, frequently trade at a discount to their net asset value. We are not generally able to issue and sell our common stock at a price below our net asset value per share unless we have stockholder approval. The risk that our shares may trade at a discount to our net asset value is separate and distinct from the risk that our net asset value per share may decline. We cannot predict whether our shares will trade above, at or below net asset value. See “Risk Factors” in the accompanying prospectus.
Dividend Reinvestment Plan    
    We have adopted a dividend reinvestment plan for our stockholders, which is an “opt out” dividend reinvestment plan. Under this plan, cash distributions to our stockholders are automatically reinvested in additional shares of our common stock unless a stockholder specifically “opts out” of our dividend reinvestment plan. If a stockholder opts out, that stockholder receives cash dividends or other distributions. Stockholders who receive distributions in the form of shares of common stock generally are subject to the same U.S. federal, state and local tax consequences as stockholders who elect to receive their distributions in cash but do not receive any

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    corresponding cash distributions with which to pay any applicable taxes. See “Dividend Reinvestment Plan” in the accompanying prospectus.
Custodian and Transfer Agent    
    U.S. Bank National Association serves as our custodian, and American Stock Transfer & Trust Company, LLC serves as our transfer and dividend paying agent and registrar. See “Custodian, Transfer and Dividend Paying Agent and Registrar” in the accompanying prospectus.
Risk Factors    
    An investment in our common stock is subject to risks and involves a heightened risk of total loss of investment. In addition, the companies in which we invest are subject to special risks. See “Risk Factors” beginning on page 15 of the accompanying prospectus to read about factors you should consider, including the risks of leverage, before investing in our common stock.

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FEES AND EXPENSES

The following table is intended to assist you in understanding the costs and expenses that an investor in shares of our common stock will bear directly or indirectly. However, we caution you that some of the percentages indicated in the table below are estimates and may vary. Actual costs and expenses incurred by investors in shares of our common stock may be greater than the percentage estimates in the table below. The following table excludes one-time fees payable to third parties not affiliated with GC Advisors that were incurred in connection with each of the 2010 Debt Securitization and the 2014 Debt Securitization, collectively the Debt Securitizations, but includes all of the applicable ongoing fees and expenses of the Debt Securitizations. Whenever this prospectus supplement contains a reference to fees or expenses paid by “us” or “Golub Capital BDC,” or that “we” will pay fees or expenses, our common stockholders will indirectly bear such fees or expenses.

 
Stockholder transaction expenses:
        
Sales load (as a percentage of offering price)     3.11 %(1) 
Offering expenses (as a percentage of offering price)     0.79 %(2) 
Dividend reinvestment plan expenses     None %(3)
Total stockholder transaction expenses (as a percentage of offering price)     3.90 % 
Annual expenses (as a percentage of net assets attributable to common stock):
        
Management fees     2.54 %(4) 
Incentive fees payable under the Investment Advisory Agreement (20%)     0.80 %(5) 
Interest payments on borrowed funds     3.21 %(6) 
Other expenses     0.60 %(7) 
Acquired fund fees and expenses     0.06 %(8) 
Total annual expenses     7.21 %(9) 

(1) The underwriting discounts and commissions with respect to the shares of our common stock being sold in this offering, which is a one-time fee, is the only sales load paid in connection with this offering.
(2) Amount reflects estimated offering expenses of approximately $255,000 and is based on 1,750,000 shares offered in this offering at the public offering price of $18.35 per share.
(3) The expenses associated with the dividend reinvestment plan are included in “Other expenses.” See “Dividend Reinvestment Plan” in the accompanying prospectus.
(4) Our management fee is calculated at an annual rate equal to 1.375% and is based on the average adjusted gross assets (including assets purchased with borrowed funds and securitization-related assets, leverage, unrealized depreciation or appreciation on derivative instruments and cash collateral on deposit with custodian but adjusted to exclude cash and cash equivalents so that investors do not pay the base management fee on such assets) at the end of the two most recently completed calendar quarters and is payable quarterly in arrears. See “Management Agreements — Investment Advisory Agreement —  Management Fee” in the accompanying prospectus. The management fee referenced in the table above is based on actual amounts incurred during the three months ended June 30, 2016 by GC Advisors in its capacity as investment adviser to us and collateral manager to the 2010 Issuer and the 2014 Issuer, collectively the Securitization Issuers, annualized for a full year.

GC Advisors, as collateral manager for the 2010 Issuer under a collateral management agreement, or the 2010 Collateral Management Agreement, is entitled to receive an annual fee in an amount equal to 0.35% of the principal balance of the portfolio loans held by the 2010 Issuer at the beginning of the collection period relating to each payment date, which is payable in arrears on each payment date. This fee, which is less than the management fee payable under the Investment Advisory Agreement, is paid directly by the 2010 Issuer to GC Advisors and offset against such management fee. Accordingly, the 1.375% management fee paid by us to GC Advisors under the Investment Advisory Agreement on all of our assets, including those indirectly held through the 2010 Issuer, is reduced, on a dollar-for-dollar basis, by an amount equal to such 0.35% fee paid to GC Advisors by the 2010 Issuer. Under the 2010 Collateral Management Agreement, the term “collection period” refers to a quarterly period running from the day after the end of the prior collection period to the fifth business day of the calendar month in which a payment date occurs. This fee may be waived by the collateral manager. The 2010 Collateral Management Agreement does not include any incentive fee payable to GC Advisors.

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GC Advisors, as collateral manager for the 2014 Issuer, under a collateral management agreement, or the 2014 Collateral Management Agreement, is entitled to receive an annual fee in an amount equal to 0.25% of the principal balance of the portfolio loans held by the 2014 Issuer at the beginning of the collection period relating to each payment date, which is payable in arrears on each payment date. This fee, which is less than the management fee payable under the Investment Advisory Agreement, is paid directly by the 2014 Issuer to GC Advisors and offset against such management fee. Accordingly, the 1.375% management fee paid by us to GC Advisors under the Investment Advisory Agreement on all of our assets, including those indirectly held through the 2014 Issuer, is reduced, on a dollar-for-dollar basis, by an amount equal to such 0.25% fee paid to GC Advisors by the 2014 Issuer. Under the 2014 Collateral Management Agreement, the term “collection period” refers to a quarterly period running from the day after the end of the prior collection period to the tenth business day prior to the payment date. This fee may be waived by the collateral manager. The 2014 Collateral Management Agreement does not include any incentive fee payable to GC Advisors.

For purposes of this table, the SEC requires that the “Management fees” percentage be calculated as a percentage of net assets attributable to common stock, rather than total assets, including assets that have been funded with borrowed monies because common stockholders bear all of this cost. If the base management fee portion of the “Management fees” percentage were calculated instead as a percentage of our total assets, our base management fee portion of the “Management fees” percentage would be approximately 1.29% of total assets. The base management fee in the table above is based on net assets of $875.8 million and leverage of $862.4 million, which reflects our net assets and leverage pro forma as of June 30, 2016 after giving effect to this offering and the issuance of 1,433,486 shares of our common stock on July 21, 2016 in a private placement at a price of $17.44 per share.

(5) The incentive fee referenced in the table above is based on actual amounts incurred during the three months ended June 30, 2016, annualized for a full year. We have structured the calculation of the incentive fee to include a fee limitation such that no incentive fee will be paid to GC Advisors for any quarter if, after such payment, the cumulative incentive fees paid to GC Advisors since the effective date of our election to become a business development company would be greater than 20.0% of our Cumulative Pre-Incentive Fee Net Income (as defined below).

We accomplish this limitation by subjecting each quarterly incentive fee payable under the Income and Capital Gain Incentive Fee Calculation (as defined below) to a cap, or the Incentive Fee Cap. The Incentive Fee Cap in any quarter is equal to the difference between (a) 20.0% of Cumulative Pre-Incentive Fee Net Income and (b) cumulative incentive fees of any kind paid to GC Advisors by Golub Capital BDC since April 13, 2010, the effective date of our election to become a business development company. To the extent the Incentive Fee Cap is zero or a negative value in any quarter, no incentive fee would be payable in that quarter. “Cumulative Pre-Incentive Fee Net Income” is equal to the sum of (a) Pre-Incentive Fee Net Investment Income (as defined below) for each period since April 13, 2010 and (b) cumulative aggregate realized capital gains, cumulative aggregate realized capital losses, cumulative aggregate unrealized capital depreciation and cumulative aggregate unrealized capital appreciation since April 13, 2010.

“Pre-Incentive Fee Net Investment Income” means interest income, dividend income and any other income (including any other fees such as commitment, origination, structuring, diligence and consulting fees or other fees that we receive from portfolio companies, but excluding fees for providing managerial assistance) accrued during the calendar quarter, minus operating expenses for the calendar quarter (including the base management fee, taxes, any expenses payable under the Investment Advisory Agreement and an administration agreement, or the Administration Agreement, with the Administrator, any expenses of securitizations and any interest expense and dividends paid on any outstanding preferred stock, but excluding the incentive fee). Pre-Incentive Fee Net Investment Income includes, in the case of investments with a deferred interest feature such as market discount, debt instruments with payment-in-kind, or PIK, interest, preferred stock with PIK dividends and zero coupon securities, accrued income that we have not yet received in cash.

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The income and capital gain incentive fee calculation, or the Income and Capital Gain Incentive Fee Calculation, has two parts. The income component is calculated quarterly in arrears based on our Pre-Incentive Fee Net Investment Income for the immediately preceding calendar quarter.

Pre-Incentive Fee Net Investment Income does not include any realized capital gains, realized capital losses or unrealized capital appreciation or depreciation. Because of the structure of the income component, it is possible that an incentive fee may be calculated under this formula with respect to a period in which we have incurred a loss. For example, if we receive Pre-Incentive Fee Net Investment Income in excess of the hurdle rate (as defined below) for a calendar quarter, the income component will result in a positive value and an incentive fee will be paid unless the payment of such incentive fee would cause us to pay incentive fees on a cumulative basis that exceed 20.0% of our Cumulative Pre-Incentive Fee Net Income. Pre-Incentive Fee Net Investment Income, expressed as a rate of return on the value of our net assets (defined as total assets less indebtedness and before taking into account any incentive fees payable during the period) at the end of the immediately preceding calendar quarter, is compared to a fixed “hurdle rate” of 2.0% quarterly. If market interest rates rise, we may be able to invest our funds in debt instruments that provide for a higher return, which would increase our Pre-Incentive Fee Net Investment Income and make it easier for GC Advisors to surpass the fixed hurdle rate and receive an incentive fee based on such net investment income. Our Pre-Incentive Fee Net Investment Income used to calculate this part of the incentive fee is also included in the amount of our total assets (excluding cash and cash equivalents but including assets purchased with borrowed funds and securitization-related assets and cash collateral on deposit with custodian) used to calculate the 1.375% base management fee.

We calculate the income component of the Income and Capital Gain Incentive Fee Calculation with respect to our Pre-Incentive Fee Net Investment Income quarterly, in arrears, as follows:

zero in any calendar quarter in which the Pre-Incentive Fee Net Investment Income does not exceed the hurdle rate;
100.0% of our Pre-Incentive Fee Net Investment Income with respect to that portion of such Pre-Incentive Fee Net Investment Income, if any, that exceeds the hurdle rate but is less than 2.5% in any calendar quarter. We refer to this portion of our Pre-Incentive Fee Net Investment Income (which exceeds the hurdle rate but is less than 2.5%) as the “catch-up” provision. The catch-up is meant to provide GC Advisors with 20.0% of the Pre-Incentive Fee Net Investment Income as if a hurdle rate did not apply if this net investment income exceeds 2.5% in any calendar quarter; and
20.0% of the amount of our Pre-Incentive Fee Net Investment Income, if any, that exceeds 2.5% in any calendar quarter.

The sum of these calculations yields the income incentive fee, or the Income Incentive Fee. This amount is appropriately adjusted for any share issuances or repurchases during the quarter.

The second part of the Income and Capital Gain Incentive Fee Calculation, or the Capital Gain Incentive Fee, equals (a) 20.0% of our Capital Gain Incentive Fee Base (as defined below), if any, calculated in arrears as of the end of each calendar year (or upon termination of the Investment Advisory Agreement, as of the termination date), commencing with the calendar year ending December 31, 2010, less (b) the aggregate amount of any previously paid Capital Gain Incentive Fees. Our “Capital Gain Incentive Fee Base” equals (1) the sum of (i) our realized capital gains, if any, on a cumulative positive basis from April 13, 2010 through the end of each calendar year, (ii) all realized capital losses on a cumulative basis and (iii) all unrealized capital depreciation on a cumulative basis less (2) all unamortized deferred financing costs, if and to the extent such costs exceed all unrealized capital appreciation on a cumulative basis.

The cumulative aggregate realized capital losses are calculated as the sum of the amounts by which (a) the net sales price of each investment in our portfolio when sold is less than (b) the accreted or amortized cost basis of such investment.
The cumulative aggregate realized capital gains are calculated as the sum of the differences, if positive, between (a) the net sales price of each investment in our portfolio when sold and (b) the accreted or amortized cost basis of such investment.

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The aggregate unrealized capital depreciation is calculated as the sum of the differences, if negative, between (a) the valuation of each investment in our portfolio as of the applicable Capital Gain Incentive Fee calculation date and (b) the accreted or amortized cost basis of such investment.

As described above, the incentive fee will not be paid at any time where after such payment the cumulative incentive fees paid to date would be greater than 20.0% of the Cumulative Pre-Incentive Net Income since April 13, 2010. In accordance with generally accepted accounting principles in the United States of America, or GAAP, we will accrue a capital gain incentive fee on a quarterly basis as if aggregate unrealized capital appreciation on investments were realized, even though such unrealized capital appreciation is not permitted to be considered in calculating the fee actually payable under the Investment Advisory Agreement. We will accrue a capital gain incentive fee under GAAP if the Capital Gain Incentive Fee Base, adjusted as required by GAAP to include unrealized appreciation, is positive. The Capital Gain Incentive Fee is calculated on a cumulative basis from the date we elected to become a business development company through the end of each calendar year. Since inception through June 30, 2016, we have not made any Capital Gain Incentive Fee payments. For the three and nine months ended June 30, 2016, we accrued a capital gain incentive fee under GAAP of $0.6 million and $1.4 million, respectively. For a more detailed discussion of the calculation of the incentive fee, see “Management Agreements — Investment Advisory Agreement — Management Fee” in the accompanying prospectus.

(6) Interest payments on borrowed funds represents our annualized interest expense as of June 30, 2016 and includes interest payable on the notes issued by each of the Securitization Issuers. For the three months ended June 30, 2016, the effective annualized average interest rate on our total debt outstanding, which includes all interest and amortization of debt issuance costs on the Debt Securitizations but excludes secured borrowings, was 3.3%. Debt issuance costs represent fees and other direct incremental costs incurred in connection with the Debt Securitizations. These fees include a structuring and placement fee paid to Wells Fargo Securities, LLC for its services in connection with the initial structuring and subsequent amendment of the 2010 Debt Securitization and the initial structuring of the 2014 Debt Securitization of $1.74 million, $0.75 million and $1.81 million, respectively, as well as legal fees, accounting fees, rating agency fees and all other costs associated with each of the Debt Securitizations. We do not currently anticipate issuing debt securities or preferred stock in the next 12 months.
(7) Includes our overhead expenses, including payments under the Administration Agreement based on our allocable portion of overhead and other expenses incurred by the Administrator, and any acquired fund fees and expenses that are not required to be disclosed separately. See “Management Agreements —  Administration Agreement” in the accompanying prospectus. “Other expenses” also includes the ongoing administrative expenses to the trustee, collateral manager, independent accountants, legal counsel, rating agencies and independent managers in connection with developing and maintaining reports and providing required services in connection with the administration of each of the Debt Securitizations. “Other expenses” are based on actual amounts incurred during the three months ended June 30, 2016, annualized for a full year. The administrative expenses of each of the Securitization Issuers are paid on each payment date in two parts: (1) a component that is paid in a priority to other amounts distributed by the 2010 Issuer or the 2014 Issuer, as applicable, subject to a cap equal to the sum of 0.04% per annum of the adjusted principal balance of the portfolio loans and other assets held by the 2010 Issuer or the 2014 Issuer, as applicable, on the last day of the collection period relating to such payment date, plus $150,000 per annum, and (2) a component that is paid in a subordinated position relative to other amounts distributed by the 2010 Issuer or the 2014 Issuer, as applicable, equal to any amounts that exceed the aforementioned administrative expense cap.
(8) Our stockholders indirectly bear the expenses of our investment in SLF. No management fee is charged by the Administrator in connection with the administrative services it provides to SLF. However, SLF does reimburse the Administrator for its costs related to providing accounting, bookkeeping, treasury, loan operations, reporting and administrative services for SLF. Future expenses for SLF may be substantially higher or lower because certain expenses may fluctuate over time.

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(9) All of our expenses, including all expenses of each of the Debt Securitizations, are disclosed in the appropriate line items under “Annual Expenses (as a percentage of net assets attributable to common stock).” “Total annual expenses” as a percentage of consolidated net assets attributable to common stock are higher than the total annual expenses percentage would be for a company that is not leveraged. We borrow money to leverage our net assets and increase our total assets. The SEC requires that the “Total annual expenses” percentage be calculated as a percentage of net assets (defined as total assets less indebtedness and after taking into account any incentive fees payable during the period), rather than the total assets, including assets that have been funded with borrowed monies. The reason for presenting expenses as a percentage of net assets attributable to common stockholders is that our common stockholders bear all of our fees and expenses.

Example

The following example demonstrates the projected dollar amount of total cumulative expenses that would be incurred over various periods with respect to a hypothetical investment in our common stock. This example and the expenses in the table above should not be considered a representation of our future expenses, and actual expenses (including the cost of debt, if any, and other expenses) may be greater or less than those shown. These amounts assume (1) a 3.11% sales load (underwriting discounts and commissions), (2) offering expenses totaling 0.79% and (3) total net annual expenses of 6.41% of net assets attributable to common shares as set forth in the table above (other than performance-based incentive fees). Transaction expenses are not included in the following example. For purposes of this table, we have assumed leverage of $862.4 million, which was our actual leverage as of June 30, 2016.

       
You would pay the following expenses on a $1,000 investment   1 year   3 years   5 years   10 years
Assuming a 5% annual return (assumes no return from net realized capital gains or net unrealized capital appreciation)   $ 101     $ 221     $ 338     $ 617  
Assuming a 5% annual return (assumes return entirely from net realized capital gains and thus subject to the capital gain incentive fee)   $ 110     $ 248     $ 378     $ 679  

The foregoing table is to assist you in understanding the various costs and expenses that an investor in our common stock will bear directly or indirectly. While the example assumes, as required by the SEC, a 5% annual return, our performance will vary and may result in a return greater or less than 5%. The incentive fee under the Investment Advisory Agreement, which, assuming a 5% annual return, would either not be payable or have an immaterial impact on the expense amounts shown above, is not included in the example. Under our Investment Advisory Agreement, no incentive fee would be payable if we have a 5% annual return. If we achieve sufficient returns on our investments, including through the realization of capital gains, to trigger an incentive fee of a material amount, our expenses, and returns to our investors, would be higher. The example assumes that all dividends and other distributions are reinvested at net asset value. Under certain circumstances, reinvestment of dividends and other distributions under our dividend reinvestment plan may occur at a price per share that differs from net asset value. See “Dividend Reinvestment Plan” in the accompanying prospectus for more information.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

Some of the statements in this prospectus supplement and the accompanying prospectus constitute forward-looking statements, which relate to future events or our future performance or financial condition. The forward-looking statements contained in this prospectus supplement and the accompanying prospectus involve risks and uncertainties, including statements as to:

our future operating results;
our business prospects and the prospects of our portfolio companies;
the effect of investments that we expect to make and the competition for those investments;
our contractual arrangements and relationships with third parties;
actual and potential conflicts of interest with GC Advisors and other affiliates of Golub Capital;
the dependence of our future success on the general economy and its effect on the industries in which we invest;
the ability of our portfolio companies to achieve their objectives;
the use of borrowed money to finance a portion of our investments;
the adequacy of our financing sources and working capital;
the timing of cash flows, if any, from the operations of our portfolio companies;
general economic trends and other external factors;
the ability of GC Advisors to locate suitable investments for us and to monitor and administer our investments;
the ability of GC Advisors or its affiliates to attract and retain highly talented professionals;
our ability to qualify and maintain our qualification as a RIC and as a business development company;
general price and volume fluctuations in the stock markets;
the impact on our business of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the rules and regulations issued thereunder; and
the effect of changes to tax legislation and our tax position.

Such forward-looking statements may include statements preceded by, followed by or that otherwise include the words “may,” “might,” “will,” “intend,” “should,” “could,” “can,” “would,” “expect,” “believe,” “estimate,” “anticipate,” “predict,” “potential,” “plan” or similar words. The forward-looking statements contained in this prospectus supplement and the accompanying prospectus involve risks and uncertainties. Our actual results could differ materially from those implied or expressed in the forward-looking statements for any reason, including the factors set forth as “Risk Factors” in the accompanying prospectus and elsewhere in this prospectus supplement and the accompanying prospectus.

We have based the forward-looking statements included in this prospectus supplement on information available to us on the date of this prospectus supplement. Actual results could differ materially from those anticipated in our forward-looking statements and future results could differ materially from historical performance. You are advised to consult any additional disclosures that we may make directly to you or through reports that we have filed or in the future may file with the SEC, including annual reports on Form 10-K, registration statements on Form N-2, quarterly reports on Form 10-Q and current reports on Form 8-K. This prospectus supplement and the accompanying prospectus contain statistics and other data that have been obtained from or compiled from information made available by third-party service providers. We have not independently verified such statistics or data.

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You should understand that, under Section 27A(b)(2)(B) of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E(b)(2)(B) of the Exchange Act, the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995 do not apply to forward-looking statements made in connection with any offering of securities pursuant to this prospectus supplement, the accompanying prospectus or in periodic reports we file under the Exchange Act.

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USE OF PROCEEDS

We estimate that net proceeds we will receive from the sale of 1,750,000 shares of our common stock in this offering will be approximately $30.9 million (or approximately $35.5 million if the underwriter fully exercises its option), in each case based on a public offering price of $18.35 per share, after deducting the underwriting discounts and commissions payable by us and estimated offering expenses of approximately $255,000 payable by us.

We intend to use the net proceeds from the sale of our common stock to invest in portfolio companies in accordance with our investment objective and strategies and for general corporate purposes. We expect that our new investments will consist primarily of senior secured and one stop loans. We will also pay operating expenses, including management and administrative fees, and may pay other expenses such as due diligence expenses relating to potential new investments, from the net proceeds of this offering. A portion of the net proceeds may be utilized to capitalize SLF. A portion of the net proceeds may also be used to capitalize SBIC V, our SBIC subsidiary, following which we expect SBIC V to issue debentures guaranteed by the SBA and make investments in accordance with our investment strategy. We may also use a portion of the net proceeds from this offering to repay amounts outstanding under our Credit Facility, which bore an annual interest rate of 2.72% (i.e., one-month LIBOR plus 2.25% per annum) on the outstanding balance of $146.1 million as of June 30, 2016 and matures on July 30, 2020.

Until appropriate investment opportunities can be found, we may also invest the net proceeds of this offering primarily in cash, cash equivalents, U.S. government securities and high-quality debt investments that mature in one year or less from the date of investment. These temporary investments may have lower yields than our other investments and, accordingly, may result in lower distributions, if any, during such period. Our ability to achieve our investment objective may be limited to the extent that the net proceeds from this offering, pending full investment, are held in lower yielding interest-bearing deposits or other short-term instruments. See “Regulation — Temporary Investments” in the accompanying prospectus for additional information about temporary investments we may make while waiting to make longer-term investments in pursuit of our investment objective.

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CAPITALIZATION

The following table sets forth:

our actual capitalization as of June 30, 2016; and
our pro forma capitalization to give effect to (i) the sale of 1,750,000 shares of common stock in this offering based on the public offering price of $18.35 per share, after deducting the underwriting discounts and commissions and estimated offering expenses of approximately $255,000 payable by us and (ii) the issuance of 1,433,486 shares of common stock on July 21, 2016 in a private placement at a price of $17.44 per share.

   
  As of June 30, 2016
     Actual   Pro Forma
     (dollars in thousands)
Assets:
                 
Cash and cash equivalents   $ 61,894     $ 117,714  
Investments, at fair value     1,628,509       1,628,509  
Other assets     6,293       6,293  
Total assets     1,696,696       1,752,516  
Liabilities:
                 
Debt     862,050       862,050  
Less unamortized debt issuance costs     6,051       6,051  
Debt less unamortized debt issuance cost     855,999       855,999  
Secured borrowings     326       326  
Other liabilities     20,390       20,390  
Total liabilities     876,715       876,715  
Net assets:
                 
Common stock, par value $0.001 per share; 100,000,000 shares authorized, 51,623,325 shares issued and outstanding; 54,806,811 shares issued and outstanding, pro forma     52       55  
Paid in capital in excess of par     796,060       851,877  
Undistributed net investment income     2,640       2,640  
Net unrealized appreciation (depreciation) on investments and secured borrowings     20,747       20,747  
Net realized gain (loss) on investments     482       482  
Total net assets     819,981       875,801  
Net asset value per common share   $ 15.88     $ 15.98  

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SELECTED CONSOLIDATED FINANCIAL DATA

The following selected consolidated financial data of Golub Capital BDC as of and for the years ended September 30, 2015, 2014, 2013, 2012 and 2011 are derived from our consolidated financial statements that have been audited by RSM US LLP, an independent registered public accounting firm. The consolidated financial statements for the nine-month periods ended June 30, 2016 and 2015 are unaudited. However, in our opinion, all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation have been made. Interim results may be subject to significant quarterly variations and may not be indicative of the results of operations to be expected for a full fiscal year. The financial data should be read in conjunction with our consolidated financial statements and related notes thereto and with “Interim Management’s Discussion and Analysis of Financial Condition, Results of Operations and Cash Flows” included elsewhere in this prospectus supplement and “Management’s Discussion and Analysis of Financial Condition, Results of Operations and Cash Flows” included in the accompanying prospectus.

             
             
  As of and for the
nine months ended
  As of and for the years ended
  June 30,
2016
  June 30,
2015
  September 30,
2015
  September 30,
2014
  September 30,
2013
  September 30,
2012
  September 30,
2011
     (unaudited)   (unaudited)     (In thousands, except per share data)
Statement of Operations Data:
                                                              
Total investment income   $ 93,368     $ 86,416     $ 119,968     $ 109,526     $ 83,774     $ 57,859     $ 39,150  
Base management fee     16,286       14,902       20,330       17,053       11,749       8,495       5,789  
Incentive fee     4,262       5,712       10,226       10,128       9,844       6,228       348  
Interest and other debt financing expenses     20,583       17,853       24,510       20,227       12,427       10,781       6,550  
All other expenses     4,152       4,433       5,905       5,583       5,359       4,479       3,647  
Net investment income     47,752 (1)      43,516       58,997       56,535       44,395       27,876       22,816  
Net realized gain (loss) on investments and derivative instruments     (260 )      4,503       9,354       5,384       (1,363 )      (3,372 )      2,037  
Net change in unrealized appreciation (depreciation) on investments, derivative instruments and secured borrowings     5,613       3,302       2,440       3,469       3,488       7,256       (3,514 ) 
Net increase (decrease) in net assets resulting from operations     53,105       51,321       70,791       65,388       46,520       31,760       21,339  
Per share data:
                                                              
Net asset value   $ 15.88     $ 15.74     $ 15.80     $ 15.55     $ 15.21     $ 14.60     $ 14.56  
Net investment income     0.93       0.90       1.20       1.26       1.29       1.15       1.16  
Net realized (loss) gain on investments and derivative instruments     (0.01 )      0.10       0.19       0.11       (0.04 )      (0.14 )      0.11  
Net change in unrealized appreciation (depreciation) on investments, derivative instruments and secured borrowings     0.11       0.06       0.05       0.07       0.10       0.30       (0.17 ) 
Net increase in net assets resulting from operations     1.03       1.06       1.44       1.44       1.35       1.31       1.09  
Per share distributions declared     0.96       0.96       1.28       1.28       1.28       1.28       1.27  
From net investment income     0.96       0.96       1.18       1.22       1.15       1.24       1.18  
From capital gains     N/A       N/A       0.10       0.06                   0.09  
From return of capital     N/A       N/A                   0.13       0.04        
Dollar amount of distributions declared     49,342       46,566       62,969       57,823       45,394       31,556       25,069  
From net investment income     49,342       46,566       58,152       54,531       40,605       30,484       23,254  
From capital gains     N/A       N/A       4,817       3,292                   1,815  
From return of capital     N/A       N/A                   4,789       1,072        
Balance Sheet data at period end:
                                                              
Investments, at fair value   $ 1,628,509     $ 1,570,687     $ 1,529,784     $ 1,347,612     $ 1,024,645     $ 672,910     $ 459,827  
Cash and cash equivalents     61,894       56,687       97,484       79,943       54,717       50,927       69,766  
Other assets     6,293       10,660 (2)      6,158 (2)      6,318 (2)      4,552 (2)      4,361 (2)      24,706 (2) 
Total assets     1,696,696       1,638,034 (2)      1,633,426 (2)      1,433,873 (2)      1,083,914 (2)      728,198 (2)      554,299 (2) 
Total debt     862,376       823,463       813,605       697,539       420,909       352,300       237,683  
Total liabilities     876,715       830,990 (2)      822,556 (2)      701,134 (2)      425,678 (2)      353,069 (2)      237,750 (2) 
Total net assets     819,981       807,044       810,870       732,739       658,236       375,129       316,549  

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  As of and for the
nine months ended
  As of and for the years ended
  June 30,
2016
  June 30,
2015
  September 30,
2015
  September 30,
2014
  September 30,
2013
  September 30,
2012
  September 30,
2011
     (unaudited)   (unaudited)     (In thousands, except per share data)
Other Data
                                                              
Weighted average annualized yield on income producing investments at fair value(3)     7.6 %      7.7 %      7.8 %      8.3 %      9.1 %      9.3 %      8.6 % 
Number of portfolio companies at period end     185       157       164       145       135       121       103  

(1) Net investment income for the nine months ended June 30, 2016 is shown after a net expense of $333,000 for U.S. federal excise tax.
(2) On October 1, 2015, we adopted Accounting Standards Update, or ASU, 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU 2015-03, which requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the carrying amount of the debt liability rather than as an asset. Adoption of ASU 2015-03 requires the changes to be applied retrospectively.
(3) Weighted average yield on income producing investments is calculated as income from interest, including subordinated notes in SLF, and fees excluding amortization of capitalized fees and discounts divided by the average fair value of earning investments.

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INTERIM MANAGEMENT’S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION, RESULTS OF OPERATIONS AND CASH FLOWS

The following discussion and analysis of our financial condition, results of operations and cash flows should be read in conjunction with “Selected Consolidated Financial Data” and the financial statements and the related notes thereto appearing elsewhere in this prospectus supplement and the accompanying prospectus. The information in this section contains forward-looking statements that involve risks and uncertainties. Please see “Risk Factors” in the accompanying prospectus and “Special Note Regarding Forward-Looking Statements” in this prospectus supplement for a discussion of the uncertainties, risks and assumptions associated with these statements.

Overview

We are an externally managed, closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the 1940 Act. In addition, for U.S. federal income tax purposes, we have elected to be treated as a RIC under Subchapter M of the Code. As a business development company and a RIC, we are also subject to certain constraints, including limitations imposed by the 1940 Act and the Code.

Our shares are currently listed on The NASDAQ Global Select Market under the symbol “GBDC”.

Our investment objective is to generate current income and capital appreciation by investing primarily in senior secured and one stop loans of U.S. middle-market companies. We may also selectively invest in second lien and subordinated loans of, and warrants and minority equity securities in U.S. middle-market companies. We intend to achieve our investment objective by (1) accessing the established loan origination channels developed by Golub Capital, a leading lender to U.S. middle-market companies with over $18.0 billion in capital under management as of June 30, 2016, (2) selecting investments within our core middle-market company focus, (3) partnering with experienced private equity firms, or sponsors, in many cases with whom Golub Capital has invested alongside in the past, (4) implementing the disciplined underwriting standards of Golub Capital and (5) drawing upon the aggregate experience and resources of Golub Capital.

Our investment activities are managed by GC Advisors and supervised by our board of directors of which a majority of the members are independent of us, GC Advisors and its affiliates.

Under the Investment Advisory Agreement, which was most recently reapproved by our board of directors in May 2016, we have agreed to pay GC Advisors an annual base management fee based on our average adjusted gross assets as well as an incentive fee based on our investment performance. Under the Administration Agreement, we are provided with certain administrative services by the Administrator, which is currently Golub Capital LLC. Under the Administration Agreement, we have agreed to reimburse the Administrator for our allocable portion (subject to the review and approval of our independent directors) of overhead and other expenses incurred by the Administrator in performing its obligations under the Administration Agreement.

We seek to create a portfolio that includes primarily senior secured and one stop loans by primarily investing approximately $5.0 million to $30.0 million of capital, on average, in the securities of U.S. middle-market companies. We may also selectively invest more than $30.0 million in some of our portfolio companies and generally expect that the size of our individual investments will vary proportionately with the size of our capital base.

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We generally invest in securities that have been rated below investment grade by independent rating agencies or that would be rated below investment grade if they were rated. These securities, which may be referred to as “junk,” have predominantly speculative characteristics with respect to the issuer’s capacity to pay interest and repay principal. In addition, many of our debt investments have floating interest rates that reset on a periodic basis and typically do not fully pay down principal prior to maturity, which may increase our risk of losing part or all of our investment.

As of June 30, 2016 and September 30, 2015, our portfolio at fair value was comprised of the following:

       
  As of June 30, 2016   As of September 30, 2015
Investment Type   Investments at
Fair Value
(In thousands)
  Percentage of
Total Investments
  Investments at
Fair Value
(In thousands)
  Percentage of
Total
Investments
Senior secured   $ 174,608       10.7 %    $ 197,329       12.9 % 
One stop     1,235,496       75.9       1,134,222       74.1  
Second lien     37,461       2.3       39,774       2.6  
Subordinated debt     1,966       0.1       1,715       0.1  
Subordinated notes in SLF(1)     81,292       5.0       76,563       5.0  
LLC equity interests in SLF(1)     29,772       1.8       22,373       1.5  
Equity     67,914       4.2       57,808       3.8  
Total   $ 1,628,509       100.0 %    $ 1,529,784       100.0 % 

(1) Proceeds from the subordinated notes and LLC equity interests invested in SLF were utilized by SLF to invest in senior secured loans.

One stop loans include loans to technology companies undergoing strong growth due to new services, increased adoption and/or entry into new markets. We refer to loans to these companies as late stage lending loans. Other targeted characteristics of late stage lending businesses include strong customer revenue retention rates, a diversified customer base and backing from growth equity or venture capital firms. In some cases, the borrower’s high revenue growth is supported by a high level of discretionary spending. As part of the underwriting of such loans and consistent with industry practice, we may adjust our characterization of the earnings of such borrowers for a reduction or elimination of such discretionary expenses, if appropriate. As of June 30, 2016 and September 30, 2015, one stop loans included $109.9 million and $88.2 million, respectively, of late stage lending loans at fair value.

As of June 30, 2016 and September 30, 2015, we had debt and equity investments in 185 and 164 portfolio companies, respectively, and investments in subordinated notes and LLC equity interests in SLF.

The weighted average annualized income yield and weighted average annualized investment income yield of our income producing debt investments, which represented nearly 100% of our debt investments, for the three and nine months ended June 30, 2016 and 2015 was as follows:

       
  For the
three months ended
June 30,
  For the
nine months ended
June 30,
     2016   2015   2016   2015
Weighted average annualized income yield(1)     7.6 %      7.6 %      7.6 %      7.7 % 
Weighted average annualized investment income yield(2)     8.2 %      8.4 %      8.1 %      8.3 % 

(1) Represents income from interest, including subordinated notes in SLF, and fees excluding amortization of capitalized fees and discounts divided by the average fair value of earning debt investments.
(2) Represents income from interest, including subordinated notes in SLF, fees and amortization of capitalized fees and discounts divided by the average fair value of earning debt investments.

Revenues:  We generate revenue in the form of interest and fee income on debt investments and capital gains and distributions, if any, on portfolio company investments that we originate or acquire. Our debt investments, whether in the form of senior secured, one stop, second lien or subordinated loans, typically have

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a term of three to seven years and bear interest at a fixed or floating rate. In some instances, we receive payments on our debt investments based on scheduled amortization of the outstanding balances. In addition, we receive repayments of some of our debt investments prior to their scheduled maturity date. The frequency or volume of these repayments fluctuates significantly from period to period. Our portfolio activity also reflects the proceeds of sales of securities. In some cases, our investments provide for deferred interest payments or PIK interest. The principal amount of loans and any accrued but unpaid interest generally become due at the maturity date. In addition, we may generate revenue in the form of commitment, origination, amendment, structuring or due diligence fees, fees for providing managerial assistance and consulting fees. Loan origination fees, original issue discount and market discount or premium are capitalized, and we accrete or amortize such amounts as interest income. We record prepayment premiums on loans as fee income. For additional details on revenues, see “— Critical Accounting Policies — Revenue Recognition”.

We recognize realized gains or losses on investments based on the difference between the net proceeds from the disposition and the cost basis of the investment or derivative instrument, without regard to unrealized gains or losses previously recognized. We record current period changes in fair value of investments and derivative instruments that are measured at fair value as a component of the net change in unrealized appreciation (depreciation) on investments in the consolidated statements of operations.

Expenses:  Our primary operating expenses include the payment of fees to GC Advisors under the Investment Advisory Agreement and interest expense on our outstanding debt. We bear all other out-of-pocket costs and expenses of our operations and transactions, including:

calculating our net asset value (including the cost and expenses of any independent valuation firm);
fees and expenses incurred by GC Advisors payable to third parties, including agents, consultants or other advisors, in monitoring financial and legal affairs for us and in monitoring our investments and performing due diligence on our prospective portfolio companies or otherwise relating to, or associated with, evaluating and making investments, which fees and expenses may include, among other items, due diligence reports, appraisal reports, any studies that may be commissioned by GC Advisors and travel and lodging expenses;
expenses related to unsuccessful portfolio acquisition efforts;
offerings of our common stock and other securities;
administration fees and expenses, if any, payable under the Administration Agreement (including payments based upon our allocable portion of the Administrator’s overhead in performing its obligations under the Administration Agreement, including rent and the allocable portion of the cost of our chief compliance officer, chief financial officer and their respective staffs);
fees payable to third parties, including agents, consultants or other advisors, relating to, or associated with, evaluating and making investments in portfolio companies, including costs associated with meeting financial sponsors;
transfer agent, dividend agent and custodial fees and expenses;
U.S. federal and state registration and franchise fees;
all costs of registration and listing our shares on any securities exchange;
U.S. federal, state and local taxes;
independent directors’ fees and expenses;
costs of preparing and filing reports or other documents required by the SEC or other regulators;
costs of any reports, proxy statements or other notices to stockholders, including printing costs;
costs associated with individual or group stockholders;
costs associated with compliance under the Sarbanes-Oxley Act of 2002, as amended;

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our allocable portion of any fidelity bond, directors and officers/errors and omissions liability insurance, and any other insurance premiums;
direct costs and expenses of administration, including printing, mailing, long distance telephone, copying, secretarial and other staff, independent auditors and outside legal costs;
proxy voting expenses; and
all other expenses incurred by us or the Administrator in connection with administering our business.

We expect our general and administrative expenses to be relatively stable or decline as a percentage of total assets during periods of asset growth and to increase during periods of asset declines.

GC Advisors, as collateral manager for the 2010 Issuer under the 2010 Collateral Management Agreement, is entitled to receive an annual fee in an amount equal to 0.35% of the principal balance of the portfolio loans held by the 2010 Issuer at the beginning of the collection period relating to each payment date, which is payable in arrears on each payment date. Under the 2010 Collateral Management Agreement, the term “collection period” refers to a quarterly period running from the day after the end of the prior collection period to the fifth business day of the calendar month in which a payment date occurs.

GC Advisors, as collateral manager for the 2014 Issuer under the 2014 Collateral Management Agreement, is entitled to receive an annual fee in an amount equal to 0.25% of the principal balance of the portfolio loans held by the 2014 Issuer at the beginning of the collection period relating to each payment date, which is payable in arrears on each payment date. Under the 2014 Collateral Management Agreement, the term “collection period” refers to a quarterly period running from the day after the end of the prior collection period to the tenth business day prior to the payment date.

Collateral management fees are paid directly by the Securitization Issuers to GC Advisors and offset against the management fees payable under the Investment Advisory Agreement. In addition, the Securitization Issuers paid Wells Fargo Securities, LLC structuring and placement fees for its services in connection with the initial structuring and subsequent amendment of the 2010 Debt Securitization and the initial structuring of the 2014 Debt Securitization. The Securitization Issuers also agreed to pay ongoing administrative expenses to the trustee, collateral manager, independent accountants, legal counsel, rating agencies and independent managers in connection with developing and maintaining reports, and providing required services in connection with the administration of the Debt Securitizations, as applicable.

We believe that these administrative expenses approximate the amount of ongoing fees and expenses that we would be required to pay in connection with a traditional secured credit facility. Our common stockholders indirectly bear all of these expenses.

Recent Developments

On July 18, 2016, the Company entered into a Securities Purchase Agreement between the Company and an institutional investor for the sale of 1,433,486 shares of the Company’s common stock at a price per share of $17.44. Proceeds in cash of $25.0 million were received and the transaction closed on July 21, 2016.

On August 3, 2016, our board of directors declared a quarterly distribution of $0.32 per share payable on September 29, 2016 to holders of record as of September 5, 2016.

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Consolidated Results of Operations

Consolidated operating results for the three and nine months ended June 30, 2016 and 2015 are as follows:

           
  For the three months ended
June 30,
  Variances   For the nine months ended
June 30,
  Variances
     2016   2015   2016 vs. 2015   2016   2015   2016 vs. 2015
     (In thousands)   (In thousands)
Interest income   $ 26,858     $ 26,195     $ 663     $ 78,082     $ 76,312     $ 1,770  
Income from accretion of discounts and origination fees     2,210       2,587       (377 )      5,896       6,076       (180 ) 
Interest income from subordinated notes of SLF     1,799       1,056       743       5,192       2,258       2,934  
Dividend income     1,179       498       681       3,364       883       2,481  
Fee income     60       74       (14 )      834       887       (53 ) 
Total investment income     32,106       30,410       1,696       93,368       86,416       6,952  
Total expenses     16,221       15,205       1,016       45,283       42,900       2,383  
Net investment income – before excise tax     15,885       15,205       680       48,085       43,516       4,569  
Excise tax                       333             333  
Net investment income – after excise tax     15,885       15,205       680       47,752       43,516       4,236  
Net realized gain (loss) on investments     (5,416 )      (1,746 )      (3,670 )      (260 )      4,503       (4,763 ) 
Net change in unrealized appreciation (depreciation) on investments, and secured borrowings     7,820       4,829       2,991       5,613       3,302       2,311  
Net income   $ 18,289     $ 18,288     $ 1     $ 53,105     $ 51,321     $ 1,784  
Average earning portfolio company investments, at fair value   $ 1,524,854     $ 1,437,003     $ 87,851     $ 1,478,618     $ 1,372,658     $ 105,960  
Average debt outstanding(1)   $ 842,888     $ 763,070     $ 79,818     $ 823,169     $ 728,560     $ 94,609  

(1) For the three and nine months ending June 30, 2016 and 2015 we have excluded $0.3 million and $0.4 million, respectively, of secured borrowings, at fair value, which were the result of participations and partial loan sales that did not meet the definition of a “participating interest”, as defined in the guidance to Accounting Standards Codification, or ASC, Topic 860 — Transfers and Servicing, or ASC Topic 860.

Net income can vary substantially from period to period for various reasons, including the recognition of realized gains and losses and unrealized appreciation and depreciation. As a result, quarterly comparisons of net income may not be meaningful.

Investment Income

Investment income increased from the three months ended June 30, 2015 to the three months ended June 30, 2016 by $1.7 million primarily as a result of an increase in income from our investments in SLF of $1.3 million.

Investment income increased from the nine months ended June 30, 2015 to the nine months ended June 30, 2016 by $7.0 million primarily as a result of an increase in the average earning investment balance, which is the annual average balance of accruing loans in our investment portfolio, of $106.0 million and an increase in income from our investment in SLF of $5.1 million.

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The annualized income yield by security type for the three and nine months ended June 30, 2016 and 2015 was as follows:

       
  For the three months ended
June 30,
  For the nine months ended
June 30,
     2016   2015   2016   2015
Senior secured     6.3 %      6.3 %      6.3 %      6.3 % 
One stop     7.6 %      7.8 %      7.7 %      7.9 % 
Second lien     10.1 %      9.6 %      9.7 %      9.5 % 
Subordinated debt     4.8 %      8.2 %      5.1 %      8.2 % 
Subordinated notes in SLF(1)     8.5 %      8.3 %      8.4 %      8.3 % 

(1) SLF’s proceeds from the subordinated notes were utilized by SLF to fund senior secured loans.

Annualized income yields on one stop loans have declined for the three and nine months ended June 30, 2016 compared to the three and nine months ended June 30, 2015 primarily due to a continued general trend of interest rate compression on new investments. Due to the limited number of second lien and subordinated debt investments, quarterly income yields on second lien and subordinated debt investments can be significantly impacted by the addition, subtraction or refinancing of one investment. The increase in the annualized income yield on second lien investments was driven by a contractual rate change on one investment representing 24% of the $37.5 million, at fair value, of second lien investments held. As of June 30, 2016, we have four remaining second lien investments and two remaining subordinated debt investments shown in our consolidated financial statements beginning on page SF-2 of this prospectus supplement.

For additional details on investment yields and asset mix, refer to the “— Liquidity and Capital Resources — Portfolio Composition, Investment Activity and Yield” section below.

Expenses

The following table summarizes our expenses:

           
  For the three months ended
June 30,
  Variances   For the nine months ended
June 30,
  Variances
     2016   2015   2016 vs. 2015   2016   2015   2016 vs. 2015
     (In thousands)   (In thousands)
Interest and other debt financing expenses   $ 6,042     $ 5,025     $ 1,017     $ 17,356     $ 14,601     $ 2,755  
Amortization of debt issuance costs     977       1,117       (140 )      3,227       3,252       (25 ) 
Base management fee     5,567       5,226       341       16,286       14,902       1,384  
Income Incentive Fee     1,750       1,651       99       2,877       3,803       (926 ) 
Capital gain incentive fee accrued under GAAP     561       732       (171 )      1,385       1,909       (524 ) 
Professional fees     692       741       (49 )      2,123       2,210       (87 ) 
Administrative service fee     531       575       (44 )      1,643       1,766       (123 ) 
General and administrative expenses     101       138       (37 )      386       457       (71 ) 
Total expenses   $ 16,221     $ 15,205     $ 1,016     $ 45,283     $ 42,900     $ 2,383  

Interest and other debt financing expenses increased by $1.0 million from the three months ended June 30, 2015 to the three months ended June 30, 2016 primarily due to an increase in the weighted average of outstanding borrowings from $763.1 million for the three months ended June 30, 2015 to $842.9 million for the three months ended June 30, 2016 and an increase in the average LIBOR, which is the index that determines the interest rate on our floating rate liabilities. The increase in our debt was primarily driven by an increase in our use of debt under our SBA debentures through our SBICs which had outstanding balances of $255.0 million as of June 30, 2016 and $220.8 million as of June 30, 2015 as well as under the Credit Facility, which increased to an outstanding balance of $146.1 million as of June 30, 2016 from an outstanding balance of $141.3 million as of June 30, 2015. The effective annualized average interest rate on our

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outstanding debt increased slightly to 3.3% for the three months ended June 30, 2016 from 3.2% for the three months ended June 30, 2015 primarily due to the increase in LIBOR.

Interest and other debt financing expenses increased by $2.8 million from the nine months ended June 30, 2015 to the nine months ended June 30, 2016 primarily due to an increase in the weighted average of outstanding borrowings from $728.6 million for the nine months ended June 30, 2015 to $823.2 million for the nine months ended June 30, 2016. The effective annualized average interest rate on our outstanding debt remained stable at 3.3% for the nine months ended June 30, 2016 and 2015.

The base management fee increased as a result of a sequential increase in average assets from June 30, 2015 to June 30, 2016. The administrative service fee declined from the nine months ended June 30, 2015 to the nine months ended June 30, 2016 due to efficiencies gained by the Administrator in servicing a growing portfolio.

The incentive fee payable under the Investment Advisory Agreement consists of two parts: (1) the Income Incentive Fee and (2) the Capital Gain Incentive Fee. The Income Incentive Fee increased by less than $0.1 million and decreased $0.9 million from the three and nine months ended June 30, 2015 to the three and nine months ended June 30, 2016 as the interest rate compression on new investments and the change in asset mix of our portfolio caused a decline in our Pre-Incentive Fee Net Investment Income, expressed as a rate of return on the value of our net assets. Due to this decline, we were not fully through the catch-up provision of the Income Incentive Fee calculation. For the three months ended June 30, 2016, the Income Incentive Fee as a percentage of Pre-Incentive Fee Net Investment Income was 9.6% compared to 9.4% for the three months ended June 30, 2015. For the nine months ended June 30, 2016, the Income Incentive Fee as a percentage of Pre-Incentive Fee Net Investment Income was 5.5% compared to 7.7% for the nine months ended June 30, 2015.

The Capital Gain Incentive Fee payable as calculated under the Investment Advisory Agreement for the three and nine months ended June 30, 2016 and 2015 was $0. However, in accordance with GAAP, we are required to include the aggregate unrealized capital appreciation on investments in the calculation and accrue a capital gain incentive fee as if such unrealized capital appreciation were realized, even though such unrealized capital appreciation is not permitted to be considered in calculating the fee actually payable under the Investment Advisory Agreement.

We recorded an accrual for capital gain incentive fee under GAAP of $0.6 million, or $0.01 per share, and $1.4 million, or $0.03 per share, for the three and nine months ended June 30, 2016, respectively. The accrual for capital gain incentive fee under GAAP was $0.7 million, or $0.02 per share, for the three months ended June 30, 2015 and $1.9 million, or $0.04 per share, for the nine months ended June 30, 2015. The decrease in the accrual for capital gain incentive fee under GAAP for the three and nine months ended June 30, 2016 from the three and nine months ended June 30, 2015 was primarily the result of the realized loss on the liquidation of one non-accrual portfolio company investment that was partially offset by unrealized appreciation of debt and equity investments.

For additional details on the liquidation of equity investments, refer to the “— Net Realized and Unrealized Gains and Losses” section below.

The Administrator pays for certain expenses incurred by us. These expenses are subsequently reimbursed in cash. Total expenses reimbursed by us to the Administrator for the three and nine months ended June 30, 2016 were $0.7 million and $2.1 million, respectively. Total expenses reimbursed by us to the Administrator for the three and nine months ended June 30, 2015 were $0.2 million and $0.7 million, respectively.

As of June 30, 2016 and September 30, 2015, included in accounts payable and accrued expenses were $0.3 million and $0.6 million, respectively, for accrued expenses paid on behalf of us by the Administrator.

Excise Tax Expense

We have elected to be treated as a RIC under Subchapter M of the Code and operate in a manner so as to qualify for the tax treatment applicable to RICs. In order to be subject to tax as a RIC, we are required to meet certain source of income and asset diversification requirements, as well as timely distribute to our stockholders at least 90% of investment company taxable income, as defined by the Code, and determined

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without regard to any deduction for dividends paid for each tax year. We have made and intend to continue to make the requisite distributions to our stockholders, which will generally relieve us from U.S. federal income taxes.

Depending on the level of taxable income earned in a tax year, we may choose to retain taxable income in excess of current year distributions into the next tax year in an amount less than what would trigger payments of federal income tax under Subchapter M of the Code. We may then be required to pay a 4% excise tax on such income. To the extent that we determine that our estimated current year annual taxable income may exceed estimated current year distributions, we accrue excise tax, if any, on estimated excess taxable income as taxable income is earned. For the three and nine months ended June 30, 2016, we recorded a net expense of $0 and $333,000, respectively, for U.S. federal excise tax. For the three and nine months ended June 30, 2015, we recorded no U.S. federal excise tax expense.

Net Realized and Unrealized Gains and Losses

The following table summarizes our net realized and unrealized gains (losses) for the periods presented:

           
  For the three months ended
June 30,
  Variances   For the nine months ended
June 30,
  Variances
     2016   2015   2016 vs. 2015   2016   2015   2016 vs. 2015
     (In thousands)   (In thousands)
Net realized gain (loss) on investments   $ (5,416 )    $ (1,746 )    $ (3,670 )    $ (260 )    $ 4,503     $ (4,763 ) 
Net realized gain (loss)     (5,416 )      (1,746 )      (3,670 )      (260 )      4,503       (4,763 ) 
Unrealized appreciation on investments     17,257       11,856       5,401       33,855       21,901       11,954  
Unrealized (depreciation) on investments     (10,256 )      (7,008 )      (3,248 )      (26,704 )      (18,803 )      (7,901 ) 
Unrealized appreciation on investments in SLF(1)     818             818             203       (203 ) 
Unrealized (depreciation) on investments in SLF(1)           (19 )      19       (1,539 )            (1,539 ) 
Unrealized depreciation on secured borrowings     1             1       1       1        
Net change in unrealized appreciation (depreciation) on investments, investments in SLF, and secured borrowings   $ 7,820     $ 4,829     $ 2,991     $ 5,613     $ 3,302     $ 2,311  

(1) Unrealized appreciation (depreciation) on investments in SLF include our investments in subordinated notes and LLC interests in SLF.

For the three months ended June 30, 2016, we had a net realized loss of $5.4 million primarily due to the realized loss on the sale of one non-accrual portfolio company investment that was partially offset by the sale of equity and debt investments. For the nine months ended June 30, 2016, we had a net realized loss of $0.3 million primarily due to the realized loss on the sale of one non-accrual portfolio company investment and the write off of one non-accrual portfolio company investment that were partially offset by the sale of, or capital gain distributions received from, five equity investments.

During the three months ended June 30, 2016, we had $17.3 million in unrealized appreciation on 114 portfolio company investments, which was offset by $10.3 million in unrealized depreciation on 143 portfolio company investments. For the nine months ended June 30, 2016, we had $33.9 million in unrealized appreciation on 135 portfolio company investments, which was offset by $26.7 million in unrealized depreciation on 138 portfolio company investments. Unrealized appreciation during the three and nine months ended June 30, 2016 resulted from an increase in fair value primarily due to the rise in market prices of portfolio company investments and the reversal of prior period unrealized depreciation associated with the non-accrual portfolio company investments that were sold and written-off. Unrealized depreciation primarily resulted from the amortization of discounts, negative credit related adjustments that caused a

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reduction in fair value and the reversal of the net unrealized appreciation associated with the sales of portfolio company investments during the three and nine months ended June 30, 2016.

For the three months ended June 30, 2016, we had $0.8 million in unrealized appreciation on our investment in SLF LLC equity interests and an amount less than $0.1 million in unrealized appreciation on our investment in SLF subordinated notes. The unrealized appreciation on the SLF LLC equity interests was driven by positive credit related adjustments associated with SLF’s investment portfolio.

For the nine months ended June 30, 2016, we had $0.7 million of unrealized depreciation on our investment in SLF LLC equity interests and $0.8 million of unrealized depreciation on our investment in SLF subordinated notes. The unrealized depreciation on the SLF subordinated notes was the result of the lower yielding contractual rate compared to comparable market pricing of subordinated notes. The unrealized depreciation on the SLF LLC equity interests was driven by negative credit related adjustments associated with SLF’s investment portfolio which was partially offset by the offsetting impact of the pricing on the subordinated notes.

For the three months ended June 30, 2015, we had a net realized loss of $1.7 million primarily due to the write off of one non-accrual portfolio company investment. For the nine months ended June 30, 2015, we had net realized gains on investments totaling $4.5 million primarily due to the sale of four equity investments, which was partially offset by the write-off of one non-accrual portfolio company investment.

During the three months ended June 30, 2015, we had $11.9 million in unrealized appreciation on 83 portfolio company investments, which was offset by $7.0 million in unrealized depreciation on 128 portfolio company investments. For the nine months ended June 30, 2015, we had $21.9 million in unrealized appreciation on 108 portfolio company investments, which was offset by $18.8 million in unrealized depreciation on 132 portfolio company investments. Unrealized appreciation during the three and nine months ended June 30, 2015 resulted from an increase in fair value primarily due to the rise in market prices of portfolio company investments and the reversal of prior period unrealized depreciation associated with the portfolio company investment write-off. Unrealized depreciation primarily resulted from the amortization of discounts, negative credit related adjustments that caused a reduction in fair value and the reversal of the net unrealized appreciation associated with the sales of portfolio company investments during the three and nine months ended June 30, 2015.

For the three and nine months ended June 30, 2015, we had less than $0.1 million in unrealized depreciation and $0.2 million in unrealized appreciation on our investment in SLF LLC equity interests, respectively. The unrealized appreciation on the SLF LLC equity interests was primarily driven by no negative mark-to-market losses in the aggregate associated with SLF’s investment portfolio. For the three and nine months ended June 30, 2015, we had no unrealized appreciation or depreciation on our investment in SLF subordinated notes.

Liquidity and Capital Resources

For the nine months ended June 30, 2016, we experienced a net decrease in cash and cash equivalents of $2.3 million. During the period, cash used in operating activities was $38.7 million primarily as a result of funding of portfolio investments of $471.5 million. This was partially offset by the proceeds from principal payments and sales of portfolio investments of $387.3 million and net investment income of $47.8 million. During the same period, cash provided by investment activities of $33.3 million was driven by the decrease in restricted cash and cash equivalents. Lastly, cash provided by financing activities was $3.1 million, primarily driven by borrowings on debt of $288.1 million that were partially offset by repayments of debt of $239.1 million and distributions paid of $44.0 million.

For the nine months ended June 30, 2015, we experienced a net increase in cash and cash equivalents of $1.4 million. During the period, we used $170.7 million in operating activities primarily as a result of fundings of portfolio investments of $667.1 million. This was partially offset by proceeds from principal payments and sales of portfolio investments of $461.5 million and net investment income of $43.5 million. During the same period, cash provided by investment activities of $24.6 million was driven by the decrease in restricted cash and cash equivalents. Lastly, cash provided by financing activities was $147.4 million,

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primarily driven by borrowings on debt of $347.4 million and proceeds from shares sold of $67.6 million that were partially offset by repayments of debt of $221.4 million and distributions paid of $44.3 million.

As of June 30, 2016 and September 30, 2015, we had cash and cash equivalents of $3.2 million and $5.5 million, respectively. In addition, we had restricted cash and cash equivalents of $58.7 million and $92.0 million as of June 30, 2016 and September 30, 2015, respectively. Cash and cash equivalents are available to fund new investments, pay operating expenses and pay distributions. As of June 30, 2016, $49.1 million of our restricted cash and cash equivalents could be used to fund new investments that meet the investment guidelines established in the Debt Securitizations and for the payment of interest expense on the notes issued in the Debt Securitizations. $5.7 million of such restricted cash and cash equivalents could be used to fund investments that meet the guidelines under the Credit Facility as well as for the payment of interest expense and revolving debt of the Credit Facility. As of June 30, 2016, $3.9 million of restricted cash and cash equivalents can be used to fund new investments that meet the regulatory and investment guidelines established by the SBA for our SBICs which are described in further detail in Note 7 to our consolidated financial statements, and for interest expense and fees on our outstanding SBA debentures.

As of June 30, 2016, the Credit Facility allowed Funding to borrow up to $200.0 million at any one time outstanding, subject to leverage and borrowing base restrictions. As of June 30, 2016 and September 30, 2015, subject to leverage and borrowing base restrictions, we had approximately $53.9 million and $72.7 million, respectively, of remaining commitments and $6.3 million and $40.1 million, respectively, of availability on the Credit Facility. As of June 30, 2016 and September 30, 2015, we had $146.1 million and $127.3 million outstanding under the Credit Facility, respectively. On June 22, 2016, we entered into an unsecured revolving credit facility with GC Advisors, or the Adviser Revolver, which permits us to borrow up to $20.0 million at any one time outstanding. As of June 30, 2016, we had no amounts outstanding on the Adviser Revolver, which was not outstanding as of September 30, 2015. On October 21, 2015, we terminated the $15.0 million revolving line of credit, or the Revolver, entered into by Golub Capital BDC Revolver Funding LLC, or Revolver Funding, our wholly-owned subsidiary, with PrivateBank and Trust Company. As of September 30, 2015, the Revolver allowed Revolver Funding to borrow up to $15.0 million at any one time outstanding, subject to leverage and borrowing base restrictions. As of September 30, 2015, subject to leverage and borrowing base restrictions, we had approximately $15.0 million of remaining commitments and $2.9 million of availability on the Revolver.

On July 16, 2010, we completed the 2010 Debt Securitization, which was subsequently increased to $350 million. The 2010 Notes were issued by the 2010 Issuer and consist of $203.0 million of Class A 2010 Notes, which bear interest at a rate of three-month LIBOR rate, plus 1.74%, $12.0 million of Class B 2010 Notes, which bear interest at a rate of three-month LIBOR plus 2.40%, and $135.0 million face amount of Subordinated 2010 Notes that do not bear interest. The Class A 2010 Notes and Class B 2010 Notes of the 2010 Debt Securitization are included in the June 30, 2016 and September 30, 2015 consolidated statements of financial condition as our debt and the Subordinated 2010 Notes were eliminated in consolidation.

On June 5, 2014, we completed the 2014 Debt Securitization in which the 2014 Issuer issued the 2014 Notes, including $191.0 million of Class A-1 2014 Notes, which bear interest at a rate of three-month LIBOR plus 1.75%, $20.0 million of Class A-2 2014 Notes, which bear interest at a rate of three-month LIBOR plus 1.95%, $35.0 million of Class B 2014 Notes, which bear interest at a rate of three-month LIBOR plus 2.50%, $37.5 million of Class C 2014 Notes, which bear interest at a rate of three-month LIBOR plus 3.50%, and $119.1 million of LLC equity interests in the 2014 Issuer that do not bear interest. We retained all of the Class C 2014 Notes and LLC equity interests in the 2014 Issuer totaling $37.5 million and $119.1 million, respectively. The Class A-1, Class A-2 and Class B 2014 Notes are included in the June 30, 2016 and September 30, 2015 consolidated statements of financial condition as our debt and the Class C 2014 Notes and LLC equity interests in the 2014 Issuer were eliminated in consolidation. As of June 30, 2016 and September 30, 2015, we had outstanding debt under the 2014 Debt Securitization of $246.0 million.

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Under present SBIC regulations, the maximum amount of SBA-guaranteed debentures that may be issued by multiple licensees under common management is $350.0 million. The maximum amount that a single SBIC licensee may issue is $150.0 million. On February 11, 2016, the SBA approved SBIC V’s application for an additional $75.0 million of debenture commitments bringing SBIC V’s total debenture commitments up to $150.0 million. GC SBIC IV, L.P., or SBIC IV, and SBIC V, our consolidated SBIC subsidiaries, may each borrow up to two times the amount of its regulatory capital, subject to customary regulatory requirements. As of June 30, 2016, SBIC IV and SBIC V had $150.0 million and $105.0 million of outstanding SBA-guaranteed debentures, respectively, that mature between March 2021 and September 2026, leaving incremental borrowing capacity of $45.0 million for SBIC V under present SBIC regulations. As of September 30, 2015, SBIC IV and SBIC V had $150.0 million and $75.0 million of outstanding SBA-guaranteed debentures, respectively, that mature between March 2021 and September 2025.

In accordance with the 1940 Act, with certain limited exceptions, we are only allowed to borrow amounts such that our asset coverage, as defined in the 1940 Act, is at least 200% after such borrowing. On September 13, 2011, we received exemptive relief from the SEC allowing us to modify the asset coverage requirement to exclude the SBA debentures from this calculation. As such, our ratio of total consolidated assets to outstanding indebtedness may be less than 200%. This provides us with increased investment flexibility but also increases our risks related to leverage. As of June 30, 2016, our asset coverage for borrowed amounts was 234.5% (excluding the SBA debentures).

As of June 30, 2016 and September 30, 2015, we had outstanding commitments to fund investments totaling $95.0 million and $121.5 million, respectively. These amounts may or may not be funded to the borrowing party now or in the future. The unfunded commitments relate to loans with various maturity dates, but the entire amount was eligible for funding to the borrowers as of June 30, 2016 and September 30, 2015, respectively, subject to the terms of each loan’s respective credit agreement. As of June 30, 2016, we believe that we had sufficient assets and liquidity to adequately cover future obligations under our unfunded commitments based on historical rates of drawings upon unfunded commitments, cash and restricted cash balances that we maintain, availability under our Credit Facility and Adviser Revolver, and ongoing principal repayments on debt investments. In addition, we generally hold some syndicated loans in larger portfolio companies that are salable over a relatively short period to generate cash.

Although we expect to fund the growth of our investment portfolio through the net proceeds from future securities offerings and through our dividend reinvestment plan as well as future borrowings, to the extent permitted by the 1940 Act, we cannot assure you that our efforts to raise capital will be successful. In addition to capital not being available, it also may not be available on favorable terms. To the extent we are not able to raise capital on what we believe are favorable terms, we will focus on optimizing returns by investing capital generated from repayments into new investments we believe are attractive from a risk/reward perspective. Furthermore, to the extent we are not able to raise capital and are at or near our targeted leverage ratios, we may receive smaller allocations, if any, on new investment opportunities under GC Advisors’ allocation policy and have, in the past, received such smaller allocations under similar circumstances.

Portfolio Composition, Investment Activity and Yield

As of June 30, 2016 and September 30, 2015, we had investments in 185 and 164 portfolio companies, respectively, with a total fair value of $1,517.4 million and $1,430.9 million, respectively, and had investments in subordinated notes and LLC equity interests in SLF with a total fair value of $111.1 million and $98.9 million, respectively.

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The following table shows the asset mix of our new investment commitments for the three and nine months ended June 30, 2016 and 2015:

               
  For the three months ended June 30,   For the nine months ended June 30,
     2016   2015   2016   2015
     (In thousands)   Percentage of
Commitments
  (In thousands)   Percentage of
Commitments
  (In thousands)   Percentage of
Commitments
  (In thousands)   Percentage of
Commitments
Senior secured   $ 27,257       17.5 %    $ 53,593       13.3 %    $ 99,420       20.8 %    $ 187,204       25.8 % 
One stop     126,245       80.9       314,127       78.3       352,666       73.9       479,844       66.0  
Subordinated debt     42       0.0                 42       0.0            
Subordinated notes in SLF(1)                 24,307       6.1       9,620       2.0       40,275       5.5  
LLC equity interests in SLF(1)                 6,562       1.6       10,820       2.3       12,557       1.7  
Equity securities     2,421       1.6       2,810       0.7       4,529       1.0       6,961       1.0  
Total new investment commitments   $ 155,965       100.0 %    $ 401,399       100.0 %    $ 477,097       100.0 %    $ 726,841       100.0 % 

* Represents an amount less than 0.1%.
(1) SLF’s proceeds from the subordinated notes and LLC equity interests were utilized by SLF to fund senior secured loans. As of June 30, 2016, SLF funded senior secured loans to 64 different borrowers.

For the three and nine months ended June 30, 2016, we had approximately $106.2 million and $239.0 million, respectively, in proceeds from principal payments and return of capital distributions of portfolio companies. For the three and nine months ended June 30, 2016, we had sales of securities in 6 and 28 portfolio companies, respectively, aggregating approximately $33.2 million and $148.1 million, respectively, in net proceeds.

For the three and nine months ended June 30, 2015, we had approximately $130.0 million and $256.5 million, respectively, in proceeds from principal payments and return of capital distributions from portfolio companies. For the three and nine months ended June 30, 2015, we had sales of securities in 14 and 39 portfolio companies, respectively, aggregating approximately $103.5 million and $205.0 million, respectively, in net proceeds.

The following table shows the par, amortized cost and fair value of our portfolio of investments by asset class:

           
  As of June 30, 2016(1)   As of September 30, 2015(1)
     Par   Amortized
Cost
  Fair Value   Par   Amortized
Cost
  Fair Value
     (In thousands)
Senior secured:
                                                     
Performing   $ 175,292     $ 173,319     $ 174,452     $ 199,573     $ 197,189     $ 197,329  
Non-accrual(2)     1,438       1,433       156                    
One stop:
                                                     
Performing     1,246,957       1,229,865       1,234,326       1,135,805       1,120,576       1,127,735  
Non-accrual(2)     3,899       3,845       1,170       17,645       17,078       6,487  
Second lien:
                                                     
Performing     37,838       37,394       37,461       39,924       39,464       39,774  
Non-accrual(2)                                    
Subordinated debt:
                                                     
Performing     1,749       1,749       1,966       1,707       1,707       1,715  
Non-accrual(2)                                    

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  As of June 30, 2016(1)   As of September 30, 2015(1)
     Par   Amortized
Cost
  Fair Value   Par   Amortized
Cost
  Fair Value
     (In thousands)
Subordinated notes in SLF(3)
                                                     
Performing     82,114       82,114       81,292       76,563       76,563       76,563  
Non-accrual(2)                                    
LLC equity interests in SLF(3)     N/A       31,339       29,772       N/A       23,222       22,373  
Equity     N/A       49,369       67,914       N/A       41,515       57,808  
Total   $ 1,549,287     $ 1,610,427     $ 1,628,509     $ 1,471,217     $ 1,517,314     $ 1,529,784  

(1) Twelve and nine of our loans included a feature permitting a portion of the interest due on such loan to be PIK interest as of June 30, 2016 and September 30, 2015, respectively.
(2) We refer to a loan as non-accrual when we cease recognizing interest income on the loan because we have stopped pursuing repayment of the loan or, in certain circumstances, it is past due 90 days or more on principal and interest or our management has reasonable doubt that principal or interest will be collected. See “— Critical Accounting Policies — Revenue Recognition.”
(3) SLF’s proceeds from the subordinated notes and LLC equity interests in SLF were utilized by SLF to fund senior secured loans.

As of June 30, 2016 and September 30, 2015, the fair value of our debt investments, including our investment in SLF subordinated notes, as a percentage of the outstanding par value was 98.8% and 98.5%, respectively.

The following table shows the weighted average rate, spread over LIBOR of floating rate, fixed rate and fees of investments originated and the weighted average rate of sales and payoffs of portfolio companies during the three and nine months ended June 30, 2016 and 2015:

       
  For the three months ended
June 30,
  For the nine months ended
June 30,
     2016   2015   2016   2015
Weighted average rate of new investment fundings(1)     7.2 %      6.8 %      7.0 %      6.7 % 
Weighted average spread over LIBOR of new floating rate investment fundings(1)     6.2 %      5.8 %      6.0 %      5.7 % 
Weighted average rate of new fixed rate investment fundings     10.6 %      N/A       10.6 %      10.8 % 
Weighted average fees of new investment fundings     2.1 %      1.4 %      1.8 %      1.5 % 
Weighted average rate of sales and payoffs of portfolio companies(2)     6.8 %      6.8 %      7.1 %      6.7 % 
Weighted average annualized income yield(3)     7.6 %      7.6 %      7.6 %      7.7 % 

(1) Excludes subordinated note investment in SLF.
(2) Excludes exits on investments on non-accrual status.
(3) Represents income from interest, including subordinated note investment in SLF, and fees excluding amortization of capitalized fees and discounts divided by the average fair value of earning debt investments.

As of June 30, 2016, 94.3% and 94.3% of our debt portfolio at fair value and at amortized cost, respectively, had interest rate floors that limit the minimum applicable interest rates on such loans. As of September 30, 2015, 94.2% and 94.1% of our debt portfolio at fair value and at amortized cost, respectively, had interest rate floors that limit the minimum applicable interest rates on such loans.

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As of June 30, 2016, the portfolio median EBITDA for our portfolio companies was $24.6 million. The portfolio median EBITDA is based on the most recently reported trailing twelve-month EBITDA received from the portfolio company. The portfolio median EBITDA excludes underlying borrowers in SLF.

As part of the monitoring process, GC Advisors regularly assesses the risk profile of each of our investments and rates each of them based on an internal system developed by Golub Capital and its affiliates. This system is not generally accepted in our industry or used by our competitors. It is based on the following categories, which we refer to as GC Advisors’ internal performance ratings:

 
Internal Performance Ratings
Rating   Definition
5   Involves the least amount of risk in our portfolio. The borrower is performing above expectations, and the trends and risk factors are generally favorable.
4   Involves an acceptable level of risk that is similar to the risk at the time of origination. The borrower is generally performing as expected, and the risk factors are neutral to favorable.
3   Involves a borrower performing below expectations and indicates that the loan’s risk has increased somewhat since origination. The borrower may be out of compliance with debt covenants; however, loan payments are generally not past due.
2   Involves a borrower performing materially below expectations and indicates that the loan’s risk has increased materially since origination. In addition to the borrower being generally out of compliance with debt covenants, loan payments may be past due (but generally not more than 180 days past due).
1   Involves a borrower performing substantially below expectations and indicates that the loan’s risk has substantially increased since origination. Most or all of the debt covenants are out of compliance and payments are substantially delinquent. Loans rated 1 are not anticipated to be repaid in full and we will reduce the fair market value of the loan to the amount we anticipate will be recovered.

Our internal performance ratings do not constitute any rating of investments by a nationally recognized statistical rating organization or represent or reflect any third-party assessment of any of our investments.

For any investment rated 1, 2 or 3, GC Advisors will increase its monitoring intensity and prepare regular updates for the investment committee, summarizing current operating results and material impending events and suggesting recommended actions.

GC Advisors monitors and, when appropriate, changes the internal performance ratings assigned to each investment in our portfolio. In connection with our valuation process, GC Advisors and our board of directors review these internal performance ratings on a quarterly basis.

The following table shows the distribution of our investments on the 1 to 5 internal performance rating scale at fair value as of June 30, 2016 and September 30, 2015:

       
  As of June 30, 2016   As of September 30, 2015
Internal Performance Rating   Investments at
Fair Value
(In thousands)
  Percentage of
Total
Investments
  Investments at
Fair Value
(In thousands)
  Percentage of
Total
Investments
5   $ 93,519       5.7 %    $ 134,142       8.8 % 
4     1,374,463       84.4       1,298,558       84.9  
3     158,788       9.8       87,687       5.7  
2     1,739       0.1       9,397       0.6  
1                        
Total   $ 1,628,509       100.0 %    $ 1,529,784       100.0 % 

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Senior Loan Fund LLC

We co-invest with RGA in senior secured loans through SLF, an unconsolidated Delaware LLC. SLF is capitalized as transactions are completed and all portfolio and investment decisions in respect of SLF must be approved by the SLF investment committee consisting of two representatives of each of us and RGA (with unanimous approval required from (i) one representative of each of us and RGA or (ii) both representatives of each of us and RGA). SLF may cease making new investments upon notification of either member but operations will continue until all investments have been sold or paid-off in the normal course of business.

SLF is capitalized with subordinated notes and LLC equity interest subscriptions from its members. As of June 30, 2016, we and RGA owned 87.5% and 12.5%, respectively, of both the outstanding subordinated notes and LLC equity interests.

As of June 30, 2016 and September 30, 2015, SLF had the following commitments from its members:

       
  As of June 30, 2016   As of September 30, 2015
     Committed   Funded(1)   Committed   Funded(1)
     (Dollars in thousands)
Subordinated note commitments(2)   $ 160,000     $ 93,844     $ 160,000     $ 87,500  
LLC equity commitments(2)     40,000       35,816       40,000       26,540  
Total   $ 200,000     $ 129,660     $ 200,000     $ 114,040  

(1) Funded subordinated note commitments are presented net of repayments subject to recall and funded LLC equity commitments are presented net of return of capital distributions subject to recall.
(2) Commitments presented are combined for us and RGA.

As of June 30, 2016, the SLF Credit Facility, which SLF entered into through its wholly-owned subsidiary, SLF II, allows SLF II to borrow up to $300.0 million subject to leverage and borrowing base restrictions. The reinvestment period of the SLF Credit Facility ends May 12, 2017, and the stated maturity date is May 13, 2020. As of June 30, 2016 and September 30, 2015, SLF II had outstanding debt under the SLF Credit Facility of $231.6 million and $212.3 million, respectively.

Through the reinvestment period, the SLF Credit Facility bears interest at one-month LIBOR plus a rate between 1.75% and 2.25%, depending on the composition of the collateral asset portfolio, per annum. After the reinvestment period, the rate will reset to one-month LIBOR plus 2.75% per annum for the remaining term of the SLF Credit Facility.

As of June 30, 2016 and September 30, 2015, SLF had total assets at fair value of $357.7 million and $323.4 million, respectively. As of both June 30, 2016 and September 30, 2015, SLF did not have any investments on non-accrual status. The portfolio companies in SLF are in industries and geographies similar to those in which we may invest directly. Additionally, as of June 30, 2016 and September 30, 2015, SLF had commitments to fund various undrawn revolving credit and delayed draw loans to its portfolio companies totaling $26.8 million and $30.8 million, respectively.

Below is a summary of SLF’s portfolio, followed by a listing of the individual loans in SLF’s portfolio as of June 30, 2016 and September 30, 2015:

   
  As of
June 30,
2016
  As of
September 30,
2015
     (Dollars in thousands)
Senior secured loans(1)   $ 356,334     $ 320,583  
Weighted average current interest rate on senior secured loans(2)     6.0 %      5.8 % 
Number of borrowers in SLF     64       62  
Largest portfolio company investment(1)   $ 13,083     $ 12,734  
Total of five largest portfolio company investments(1)   $ 61,968     $ 59,917  

(1) At principal amount.
(2) Computed as the (a) annual stated interest rate on accruing senior secured loans divided by (b) total senior secured loans at principal amount.

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SLF Loan Portfolio as of June 30, 2016

           
Portfolio Company   Business Description   Security Type   Maturity
Date
  Current
Interest
Rate(1)
  Principal/
Par Amount
  Fair
Value(2)
                         (In thousands)
5.11, Inc.(3)     Textiles and Leather       Senior loan       02/2020       6.0 %    $ 3,137     $ 3,137  
ACTIVE Network, Inc.     Electronics       Senior loan       11/2020       5.5       1,950       1,936  
Advanced Pain Management Holdings, Inc.,     Healthcare, Education and Childcare       Senior loan       02/2018       6.3       6,805       6,736  
Advanced Pain Management Holdings, Inc.,     Healthcare, Education and Childcare       Senior loan       02/2018       6.3       466       461  
Advanced Pain Management Holdings, Inc.(4)     Healthcare, Education and Childcare       Senior loan       02/2018       N/A (5)            (12 ) 
AG Kings Holdings Inc.(3)     Grocery       Senior loan       04/2020       7.3       6,168       6,168  
Aimbridge Hospitality, LLC(3)     Hotels, Motels, Inns, and Gaming       Senior loan       10/2018       5.8       5,063       5,063  
American Seafoods Group LLC     Beverage, Food and Tobacco       Senior loan       08/2021       6.0       4,892       4,818  
Argon Medical Devices, Inc.     Healthcare, Education and Childcare       Senior loan       12/2021       5.8       3,990       3,990  
Arise Virtual Solutions, Inc.(3)     Telecommunications       Senior loan       12/2018       7.3       10,957       10,299  
Arise Virtual Solutions, Inc.(3)(4)     Telecommunications       Senior loan       12/2018       N/A (5)            (34 ) 
Atkins Nutritionals, Inc(3)     Beverage, Food and Tobacco       Senior loan       01/2019       6.3       5,664       5,664  
Atrium Innovations     Personal and Non Durable Consumer
Products
      Senior loan       02/2021       4.3       3,494       3,402  
BMC Software, Inc.     Electronics       Senior loan       09/2020       5.0       1,881       1,674  
Boot Barn, Inc.     Retail Stores       Senior loan       06/2021       5.5       10,694       10,694  
Brandmuscle, Inc.     Printing and Publishing       Senior loan       12/2021       5.8       4,960       4,960  
C.B. Fleet Company, Incorporated     Personal and Non Durable Consumer
Products
      Senior loan       12/2021       5.8       7,651       7,651  
Checkers Drive-In Restaurants,
Inc.
    Beverage, Food and Tobacco       Senior loan       01/2022       6.5       4,847       4,810  
CLP Healthcare Services, Inc.     Healthcare, Education and Childcare       Senior loan       12/2020       6.3       8,699       8,699  
CLP Healthcare Services, Inc.     Healthcare, Education and Childcare       Senior loan       12/2020       6.3       4,384       4,384  
Community Veterinary Partners, LLC     Personal, Food and Miscellaneous
Services
      Senior loan       10/2021       6.5       2,473       2,473  
Community Veterinary Partners, LLC     Personal, Food and Miscellaneous
Services
      Senior loan       10/2021       6.5       807       807  
CPI Buyer, LLC (Cole-Parmer)(3)     Healthcare, Education and Childcare       Senior loan       08/2021       5.5       5,820       5,704  
Curo Health Services LLC(3)     Healthcare, Education and Childcare       Senior loan       02/2022       6.5       5,925       5,905  
DentMall MSO, LLC     Retail Stores       Senior loan       07/2019       6.0       10,173       8,851  
DentMall MSO, LLC     Retail Stores       Senior loan       07/2019       6.0       1,000       652  
DISA Holdings Acquisition Subsidiary Corp.     Diversified/Conglomerate Service       Senior loan       12/2020       5.5       4,579       4,442  
DISA Holdings Acquisition Subsidiary Corp.     Diversified/Conglomerate Service       Senior loan       12/2020       5.5       255       224  
EAG, INC. (Evans Analytical Group)     Diversified/Conglomerate Service       Senior loan       07/2017       5.0       2,146       2,125  
Express Oil Change, LLC(3)     Retail Stores       Senior loan       12/2017       6.0       4,909       4,860  
Express Oil Change, LLC(4)     Retail Stores       Senior loan       12/2017       N/A (5)            (5 ) 
Extreme Reach Inc.     Broadcasting and
Entertainment
      Senior loan       02/2020       7.3       5,032       5,027  
Federal-Mogul Corporation     Automobile       Senior loan       04/2021       4.8       3,930       3,661  
Flexan, LLC     Chemicals, Plastics and Rubber       Senior loan       02/2020       6.3       6,106       6,106  
Hygenic Corporation, The(3)     Personal and Non Durable Consumer
Products
      Senior loan       10/2020       7.5       4,481       4,481  
Jensen Hughes, Inc.     Diversified/Conglomerate Service       Senior loan       12/2021       6.0       2,354       2,354  
Jensen Hughes, Inc.     Diversified/Conglomerate Service       Senior loan       12/2021       6.0       110       110  
Joerns Healthcare, LLC(3)     Healthcare, Education and Childcare       Senior loan       05/2020       6.0       9,622       9,358  
Julio & Sons Company     Beverage, Food and Tobacco       Senior loan       09/2017       6.5       6,852       6,852  
Julio & Sons Company     Beverage, Food and Tobacco       Senior loan       09/2017       6.5       598       598  
Julio & Sons Company     Beverage, Food and Tobacco       Senior loan       09/2017       6.5       538       538  
K&N Engineering, Inc.(3)     Automobile       Senior loan       07/2019       5.3       3,791       3,791  
K&N Engineering, Inc.(3)     Automobile       Senior loan       07/2019       5.3 %      179       179  
Loar Group Inc.     Aerospace and Defense       Senior loan       01/2022       5.8       2,239       2,239  

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SLF Loan Portfolio as of June 30, 2016 (continued)

           
Portfolio Company   Business Description   Security Type   Maturity
Date
  Current
Interest
Rate(1)
  Principal/
Par Amount
  Fair
Value(2)
                         (In thousands)
Mediaocean LLC(3)     Diversified/Conglomerate Service       Senior loan       08/2022       5.8     $ 2,978     $ 2,978  
Northwestern Management Services, LLC     Healthcare, Education and Childcare       Senior loan       10/2017       6.5       3,877       3,877  
Northwestern Management Services, LLC     Healthcare, Education and Childcare       Senior loan       10/2017       6.5       424       424  
Northwestern Management Services, LLC     Healthcare, Education and Childcare       Senior loan       10/2017       7.5       352       352  
Packaging Coordinators, Inc.(3)     Containers, Packaging and Glass       Senior loan       08/2021       6.8       11,909       11,909  
Paradigm DKD Group, LLC     Buildings and Real Estate       Senior loan       11/2018       6.5       2,003       1,923  
Paradigm DKD Group, LLC     Buildings and Real Estate       Senior loan       11/2018       6.6       241       212  
Payless ShoeSource, Inc.     Retail Stores       Senior loan       03/2021       5.0       1,960       1,027  
Pentec Acquisition Sub, Inc.     Healthcare, Education and Childcare       Senior loan       05/2018       6.3       1,471       1,471  
PetVet Care Centers LLC(3)     Personal, Food and Miscellaneous
Services
      Senior loan       12/2020       5.8       5,910       5,910  
PetVet Care Centers LLC(3)     Personal, Food and Miscellaneous
Services
      Senior loan       12/2020       5.8       1,222       1,222  
PowerPlan Holdings, Inc.(3)     Utilities       Senior loan       02/2022       6.3       11,997       11,997  
PPT Management, LLC