Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SANDRIDGE ENERGY INC
   2. Issuer Name and Ticker or Trading Symbol
SandRidge Mississippian Trust I [SDT] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
123 ROBERT S. KERR AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
04/12/2011
(Street)

OKLAHOMA CITY, OK 73102-6406		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Units of Beneficial Interest 04/12/2011   P   3,750,000 (1) A (1) 3,750,000 I By SandRidge Exploration and Production, LLC

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Subordinated Units of Beneficial Interest (2) 04/12/2011   P   7,000,000     (2)   (2) Common Units of Beneficial Interest 7,000,000 (1) 7,000,000 I By SandRidge Exploration and Production, LLC

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SANDRIDGE ENERGY INC
123 ROBERT S. KERR AVENUE
OKLAHOMA CITY, OK 73102-6406		     X    

Signatures

 /s/ SandRidge Energy, Inc. By /s/ Philip T. Warman, Senior Vice President and General Counsel   04/12/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) On April 12, 2011, in connection with a registered public offering by the Issuer of its Common Units, SandRidge Exploration and Production, LLC, a Delaware limited liability company and wholly owned subsidiary of SandRidge Energy, Inc., conveyed royalty interests in certain of its oil and natural gas properties located in Alfalfa, Garfield, Major, Grant and Woods Counties in Oklahoma to the Issuer in exchange for 3,750,000 Common Units of the Issuer, 7,000,000 Subordinated Units of the Issuer and $338,700,000 in cash.
(2) The Subordinated Units will automatically convert into Common Units on a one-for-one basis at the end of the fourth full calendar quarter following the satisfaction by SandRidge Energy, Inc. of its drilling obligation under the Development Agreement, dated as of April 12, 2011, which drilling obligation must be satisfied no later than December 31, 2015.

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