UNITED STATES

 

 

SECURITIES AND EXCHANGE COMMISSION

 

 

Washington, D.C. 20549

 

 

 

 

SCHEDULE 13G

(Rule 13d-102)

 

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b), (c) AND (d)
AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b)

 

Under the Securities Exchange Act of 1934
(Amendment No. 3)*

 

Cytokinetics, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

23282W100

(CUSIP Number)

December 31, 2007

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o

Rule 13d-1(b)

o

Rule 13d-1(c)

x

Rule 13d-1(d)

 

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

 

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 


 

 

1.

Names of Reporting Persons
Sevin Rosen Fund VI L.P. (“SR VI”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
1,615,715 shares, except that SRB Associates VI L.P. (“SRB VI”), the general partner of SR VI, may be deemed to have sole power to vote these shares, and Jon W. Bayless (“Bayless”), Stephen M. Domenik (“Domenik”) Stephen M. Dow (“Dow”), John V. Jaggers (“Jaggers”), and Charles H. Phipps (“Phipps”), the general partners of SRB VI, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
1,615,715 shares, except that SRB VI, the general partner of SR VI, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers and Phipps, the general partners of SRB VI, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,615,715

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
3.3%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

2


 

 

1.

Names of Reporting Persons
Sevin Rosen VI Affiliates Fund L.P.  (“SR VI A”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
127,235 shares, except that SRB VI, the general partner of SR VI A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers and Phipps, the general partners of SRB VI, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
127,235 shares, except that SRB VI, the general partner of SR VI A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers and Phipps, the general partners of SRB VI, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
127,235

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
0.3%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

3


 

 

1.

Names of Reporting Persons
SRB Associates VI L.P. (“SRB VI”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
1,742,950 shares, of which 1,615,715 are directly owned by SR VI and 127,235 are directly owned by SR VI A.  SRB VI, the general partner of SR VI and SR VI A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers and Phipps, the general partners of SRB VI, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
1,742,950 shares, all of which 1,615,715 are directly owned by SR VI and 127,235 are directly owned by SR VI A.  SRB VI, the general partner of SR VI and SRVI A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers and Phipps, the general partners of SRB VI, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,742,950

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
3.5%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

4


 

 

1.

Names of Reporting Persons
Sevin Rosen Fund VII L.P. (“SR VII”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
625,950 shares, except that SRB Associates VII L.P. (“SRB VII”), the general partner of SR VII, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps and Jackie Kimzey (“Kimzey”), the general partners of SRB VII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
625,950 shares, except that SRB VII, the general partner of SR VII, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, and Kimzey, the general partners of SRB VII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
625,950

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
1.3%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

5


 

 

1.

Names of Reporting Persons
Sevin Rosen VII Affiliates Fund L.P. (“SR VII A”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
24,050 shares, except that SRB VII, the general partner of SR VII A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, and Kimzey, the general partners of SRB VII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
24,050 shares, except that SRB VII, the general partner of SR VII A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, and Kimzey, the general partners of SRB VII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
24,050

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
0.05%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

6


 

 

1.

Names of Reporting Persons
SRB Associates VII L.P. (“SRB VII”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
650,000 shares, of which 625,950 are directly owned by SR VII and 24,050 are directly owned by SR VII A.  SRB VII, the general partner of SR VII and SR VII A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, and Kimzey, the general partners of SRB VII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
650,000 shares, of which 625,950 are directly owned by SR VII and 24,050 are directly owned by SR VII A.  SRB VII, the general partner of SR VII and SR VII A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, and  Kimzey, the general partners of SRB VII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
650,000

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
1.3%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

7


 

 

1.

Names of Reporting Persons
Sevin Rosen Fund VIII L.P. (“SR VIII”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
755,631 shares, except that SRB Associates VIII L.P. (“SRB VIII”), the general partner of SR VIII, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Alan Schuele (“Schuele”), the general partners of SRB VIII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
755,631shares, except that SRB VIII, the general partner of SR VIII, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Schuele, the general partners of SRB VIII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
755,631

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
1.5%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

8


 

 

1.

Names of Reporting Persons
Sevin Rosen VIII Affiliates Fund L.P. (“SR VIII A”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
15,421 shares, except that SRB VIII, the general partner of SR VIII A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Schuele, the general partners of SRB VIII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
15,421 shares, except that SRB VIII, the general partner of SR VIII A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Schuele, the general partners of SRB VIII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
15,421

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
0.03%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

9


 

 

1.

Names of Reporting Persons
SRB Associates VIII L.P. (“SRB VIII”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
Delaware

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
771,052 shares, of which 755,631 are directly owned by SR VIII and 15,421 are directly owned by SR VIII A.  SRB VIII, the general partner of SR VIII and SR VIII A, may be deemed to have sole power to vote these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Schuele, the general partners of SRB VIII, may be deemed to have shared power to vote these shares.

 

6.

Shared Voting Power
See response to row 5.

 

7.

Sole Dispositive Power
771,052 shares, of which 755,631 are directly owned by SR VIII and 15,421 are directly owned by SR VIII A.  SRB VIII, the general partner of SR VIII and SR VIII A, may be deemed to have sole power to dispose of these shares, and Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey and Schuele, the general partners of SRB VIII, may be deemed to have shared power to dispose of these shares.

 

8.

Shared Dispositive Power
See response to row 7.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
771,052

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
1.6%

 

 

12.

Type of Reporting Person (See Instructions)
PN

 

10


 

 

1.

Names of Reporting Persons
Jon W. Bayless (“Bayless”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0 shares

 

6.

Shared Voting Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by Sevin Rosen Bayless Management Company  (“SRBMC”).  Bayless is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
0 shares

 

8.

Shared Dispositive Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Bayless is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
3,167,692

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
6.4%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

11


 

 

1.

Names of Reporting Persons
Stephen L. Domenik (“Domenik”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
11,000 shares

 

6.

Shared Voting Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Domenik is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
11,000 shares

 

8.

Shared Dispositive Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Domenik is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
3,178,692

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
6.5%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

12


 

 

1.

Names of Reporting Persons
Stephen M. Dow (“Dow”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
170,000 shares

 

6.

Shared Voting Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC. Dow is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
170,000 shares

 

8.

Shared Dispositive Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Dow is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
3,337,692

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
6.8%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

13


 

 

1.

Names of Reporting Persons
John V. Jaggers (“Jaggers”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0 shares

 

6.

Shared Voting Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC. Jaggers is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
0 shares

 

8.

Shared Dispositive Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Jaggers is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
3,167,692

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
6.4%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

14


 

 

1.

Names of Reporting Persons
Charles H. Phipps (“Phipps”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
30,000 shares

 

6.

Shared Voting Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC. Phipps is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
30,000 shares

 

8.

Shared Dispositive Power
3,167,692 shares, of which 1,615,715 are directly owned by SR VI, 127,235 are directly owned by SR VI A, 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Phipps is a general partner of SRB VI, the general partner of SR VI and SR VI A, SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
3,197,692

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
6.5%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

15


 

 

1.

Names of Reporting Persons
Jackie R. Kimzey (“Kimzey”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
513 shares

 

6.

Shared Voting Power
1,424,742 shares, of which 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Kimzey is a general partner of SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
513 shares

 

8.

Shared Dispositive Power
1,424,742 shares, of which 625,950 are directly owned by SR VII, 24,050 are directly owned by SR VII A, 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Kimzey is a general partner of SRB VII, the general partner of SR VII and SR VII A, and SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,425,255

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
2.9%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

16


 

 

1.

Names of Reporting Persons
Alan R. Schuele (“Schuele”)
Tax ID Number:

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

x

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
U.S. Citizen

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0 shares

 

6.

Shared Voting Power
774,742 shares, of which 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC. Schuele is a general partner of SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to vote these shares.

 

7.

Sole Dispositive Power
0

 

8.

Shared Dispositive Power
774,742 shares, of which 755,631 are directly owned by SR VIII, 15,421 are directly owned by SR VIII A and 3,690 are directly owned by SRBMC.  Schuele is a general partner of SRB VIII, the general partner of SR VIII and SR VIII A, and a director of SRBMC, and may be deemed to have shared power to dispose of these shares.

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
774,742

 

 

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

 

 

11.

Percent of Class Represented by Amount in Row (9)
1.6%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

17


 

This Amendment No. 3 amends the Statement on Schedule 13G/A previously filed by Sevin Rosen Fund VI L.P., a Delaware limited partnership; Sevin Rosen VI Affiliates Fund L.P., a Delaware limited partnership;  SRB Associates VI L.P., a Delaware limited partnership; Sevin Rosen Fund VII L.P., a Delaware limited partnership; Sevin Rosen VII Affiliates Fund L.P., a Delaware limited partnership;  SRB Associates VII L.P., a Delaware limited partnership; Sevin Rosen Fund VIII L.P., a Delaware limited partnership; Sevin Rosen VIII Affiliates Fund L.P., a Delaware limited partnership;  SRB Associates VIII L.P., a Delaware limited partnership; Jon W. Bayless; Stephen L. Domenik; Stephen M. Dow; John V. Jaggers; Charles H. Phipps; Jackie R. Kimzey; and Alan R. Schuele.  The foregoing entities and individuals are collectively referred to as the “Reporting Persons.”  Only those items as to which there has been a change are included in this Amendment No. 3.

 

Item 2.

 

(a)

Name of Person Filing
This Statement is filed by Sevin Rosen Fund VI L.P., a Delaware limited partnership (“SR VI”); Sevin Rosen VI Affiliates Fund L.P., a Delaware limited partnership (“SR VI A”);  SRB Associates VI L.P., a Delaware limited partnership (“SRB VI”); Sevin Rosen Fund VII L.P., a Delaware limited partnership (“SR VII”); Sevin Rosen VII Affiliates Fund L.P., a Delaware limited partnership (“SR VII A”);  SRB Associates VII L.P., a Delaware limited partnership (“SRB VII”); Sevin Rosen Fund VIII L.P., a Delaware limited partnership (“SR VIII”); Sevin Rosen VIII Affiliates Fund L.P., a Delaware limited partnership (“SR VIII A”);  SRB Associates VIII L.P., a Delaware limited partnership (“SRB VIII”); Jon W. Bayless (“Bayless”); Stephen L. Domenik (“Domenik”); Stephen M. Dow (“Dow”); John V. Jaggers (“Jaggers”); Charles H. Phipps (“Phipps”); Jackie R. Kimzey (“Kimzey”); and Alan R. Schuele (“Schuele”).  The foregoing entities and individuals are collectively referred to as the “Reporting Persons.”

 

SRB VI, the general partner of SR VI and SR VI A, may be deemed to have sole power to vote and sole power to dispose of shares of the issuer directly owned by SR VI and SR VI A.  Bayless, Domenik, Dow, Jaggers and Phipps are general partners of SRB VI and may be deemed to have shared power to vote and shared power to dispose of shares of the issuer directly owned by SR VI and SR VI A.

 

SRB VII, the general partner of SR VII and SR VII A, may be deemed to have sole power to vote and sole power to dispose of shares of the issuer directly owned by SR VII and SR VII A.  Bayless, Domenik, Dow, Jaggers, Phipps, and Kimzey are general partners of SRB VII and may be deemed to have shared power to vote and shared power to dispose of shares of the issuer directly owned by SR VII and SR VII A.

 

SRB VIII, the general partner of SR VIII and SR VIII A, may be deemed to have sole power to vote and sole power to dispose of shares of the issuer directly owned by SR VIII and SR VIII A.  Bayless, Domenik, Dow, Jaggers, Phipps, Kimzey, and Schuele are general partners of SRB VIII and may be deemed to have shared power to vote and shared power to dispose of shares of the issuer directly owned by SR VIII and SR VIII A.

 

(b)

Address of Principal Business Office or, if none, Residence
13455 Noel Road, Suite 1670, Dallas, TX 75240

 

(c)

Citizenship

 

(d)

Title of Class of Securities
Common Stock

 

(e)

CUSIP Number

 

Item 4.

Ownership

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

 

The following information with respect to the ownership of the Common Stock of the issuer by the persons filing this Statement is provided as of December 31, 2007:

 

(a)

Amount beneficially owned:   

See Row 9 of cover page for each Reporting Person.

 

(b)

Percent of class:   

See Row 11 of cover page for each Reporting Person.

 

18


 

 

(c)

Number of shares as to which the person has:

 

 

 

(i)

Sole power to vote or to direct the vote   

See Row 5 of cover page for each Reporting Person.

 

 

(ii)

Shared power to vote or to direct the vote    

See Row 6 of cover page for each Reporting Person.

 

 

(iii)

Sole power to dispose or to direct the disposition of   

See Row 7 of cover page for each Reporting Person.

 

 

(iv)

Shared power to dispose or to direct the disposition of   

See Row 8 of cover page for each Reporting Person.

 

 

19


 

Item 10.

Certification

 

 

SIGNATURES

 

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

 

Dated:  February 14, 2008

 

 

SEVIN ROSEN FUND VI L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VI L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

SEVIN ROSEN VI AFFILIATES FUND L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VI L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

 

SRB ASSOCIATES VI L.P.

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

General Partner

 

 

SEVIN ROSEN FUND VII L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VII L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

 

SEVIN ROSEN VII AFFILIATES FUND L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VII L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

SRB ASSOCIATES VII L.P.

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

General Partner

 

20


 

SEVIN ROSEN FUND VIII L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VIII L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

 

SEVIN ROSEN VIII AFFILIATES FUND L.P.

/s/ John V. Jaggers

By SRB ASSOCIATES VIII L.P.,

Signature

Its General Partner

 

 

 

 

John V. Jaggers

 

General Partner

 

 

SRB ASSOCIATES VIII L.P.

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

General Partner

 

 

JON W. BAYLESS

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

 

STEPHEN M. DOW

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

 

STEPHEN L. DOMENIK

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

 

JOHN V. JAGGERS

/s/ John V. Jaggers

 

Signature

 

21


 

CHARLES H. PHIPPS

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

 

JACKIE R. KIMZEY

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

 

ALAN R. SCHUELE

/s/ John V. Jaggers

 

Signature

 

 

 

John V. Jaggers

 

Attorney-In-Fact

 

22