FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   First Reserve GP XII Ltd 2. Date of Event Requiring Statement (Month/Day/Year) 04/24/2012 3. Issuer Name and Ticker or Trading Symbol Midstates Petroleum Company, Inc. [MPO] (Last) (First) (Middle) ONE LAFAYETTE PLACE, THIRD FLOOR 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) GREENWICH, CT 06830 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 36,550,121 I See Footnotes (1) (2) (3) (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
First Reserve GP XII Ltd ONE LAFAYETTE PLACE, THIRD FLOOR GREENWICH, CT 06830	Â	  X	Â	Â
First Reserve GP XII, LP ONE LAFAYETTE PLACE, THIRD FLOOR GREENWICH, CT 06830	Â	  X	Â	Â
FR XII Alternative GP, L.L.C. ONE LAFAYETTE PLACE, THIRD FLOOR GREENWICH, CT 06830	Â	  X	Â	Â
FR Midstates Interholding, LP ONE LAFAYETTE PLACE, THIRD FLOOR GREENWICH, CT 06830	Â	  X	Â	Â
MACAULAY WILLIAM E ONE LAFAYETTE PLACE, THIRD FLOOR GREENWICH, CT 06830	Â	  X	Â	Â

Signatures

/s/ First Reserve GP XII Limited, by John P. Foley, as attorney-in-fact		04/24/2012
**Signature of Reporting Person		Date
/s/ First Reserve GP XII, L.P., by John P. Foley, as attorney-in-fact		04/24/2012
**Signature of Reporting Person		Date
/s/ FR XII Alternative GP, LLC, by John P. Foley, as attorney-in-fact		04/24/2012
**Signature of Reporting Person		Date
/s/ FR Midstates Interholding, L.P., by John P. Foley, as attorney-in-fact		04/24/2012
**Signature of Reporting Person		Date
/s/ William E. Macaulay, by John P. Foley, as attorney-in-fact		04/24/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	These securities are directly held by FR Midstates Interholding, L.P. ("Interholding").
(2)	This form is filed jointly by First Reserve GP XII Limited ("GP XII Limited"), First Reserve GP XII, L.P. ("GP XII"), FR XII Alternative GP, LLC ("XII Alternative"), Interholding and William E. Macaulay.
(3)	GP XII Limited is the general partner of GP XII, which is the managing member of XII Alternative, which is the general partner of Interholding. Mr. Macaulay is a director of the board of directors of GP XII Limited (the "Board") and has the right to appoint the majority of the directors of the Board.
(4)	The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of the reported securities for purposes of Section 16 or for any other purpose.

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