Edgar Filing: TRANSATLANTIC PETROLEUM LTD.

SCHEDULE 13G/AMENDMENT NO 1

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

TRANSATLANTIC PETROLEUM LTD.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G89982105

(CUSIP Number)

January 28, 2010

(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)

þ Rule 13d-1(c)

o 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).

Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications:

Janice V. Sharry, Esq.
Haynes and Boone, LLP
2323 Victory Avenue, Suite 700
Dallas, Texas 75219-7673
(214) 651-5562


CUSIP No.		G89982105


1	NAMES OF REPORTING PERSONS MSD Capital, L.P.


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
	(a) o
	(b) þ

3	SEC USE ONLY



4	CITIZENSHIP OR PLACE OF ORGANIZATION

	Delaware

		5	SOLE VOTING POWER

NUMBER OF			0

SHARES		6	SHARED VOTING POWER
BENEFICIALLY
OWNED BY			15,900,000

EACH		7	SOLE DISPOSITIVE POWER
REPORTING
PERSON			0

WITH:		8	SHARED DISPOSITIVE POWER

			15,900,000

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

	15,900,000

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)

	5.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

	PN


CUSIP No.		G89982105


1	NAMES OF REPORTING PERSONS MSD Energy Investments, L.P.


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
	(a) o
	(b) þ

3	SEC USE ONLY



4	CITIZENSHIP OR PLACE OF ORGANIZATION

	Delaware

		5	SOLE VOTING POWER

NUMBER OF			0

SHARES		6	SHARED VOTING POWER
BENEFICIALLY
OWNED BY			15,900,000

EACH		7	SOLE DISPOSITIVE POWER
REPORTING
PERSON			0

WITH:		8	SHARED DISPOSITIVE POWER

			15,900,000

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

	15,900,000

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)

	5.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

	PN


CUSIP No.		G89982105

Item 1.

	(a)		Name of Issuer

			TRANSATLANTIC PETROLEUM LTD.

	(b)		Address of Issuer’s Principal Executive Offices

			5910 N. Central Expressway, Suite 1755, Dallas, Texas 75206

Item 2.

(a)

Name of Person Filing

This statement is jointly filed by and on behalf of each of MSD Capital, L.P. and MSD Energy Investments, L.P. MSD Capital is the general partner of, and may be deemed to beneficially own securities owned by, MSD Energy Investments. MSD Capital Management LLC is the general partner of, and may be deemed to beneficially own securities owned by, MSD Capital. Michael S. Dell is the controlling member of, and may be deemed to beneficially own securities owned by, MSD Capital Management. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section 13(d) or 13(g) of the Act or any other purpose, the beneficial owner of any securities covered by this statement.

(b)

Address of Principal Business Office or, if none, Residence

The address of the principal business office of each reporting person is 645 Fifth Avenue, 21st Floor, New York, New York 10022.

	(c)		Citizenship

			See Item 4 on the cover page(s) hereto.

	(d)		Title of Class of Securities

			Common Shares

	(e)		CUSIP Number

			G89982105


CUSIP No.		G89982105


Item 3.		If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is:

(a)	o	A Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).

(b)	o	A Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)	o	An insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)	o	An investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d- 1(b)(1)(ii)(F);

(g)	o	A parent holding company or control person in accordance with §240.13d- 1(b)(1)(ii)(G);

(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)	o	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)	o	A group, in accordance with §240.13d-1(b)(1)(ii)(J).


Item 4.		Ownership.

	(a)		Amount beneficially owned: See Item 9 on the cover page(s) hereto.

	(b)		Percent of class: See Item 11 on the cover page(s) hereto.

	(c)		Number of shares as to which such person has:

	(i)		Sole power to vote or to direct the vote: See Item 5 on the cover page(s) hereto.

	(ii)		Shared power to vote or to direct the vote: See Item 6 on the cover page(s) hereto.

	(iii)		Sole power to dispose or to direct the disposition of: See Item 7 on the cover page(s) hereto.

	(iv)		Shared power to dispose or to direct the disposition of: See Item 8 on the cover page(s) hereto.


Item 5.		Ownership of 5% or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following o.


CUSIP No.		G89982105


Item 6.		Ownership of More than 5 Percent on Behalf of Another Person

Not Applicable


Item 7.		Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable


Item 8.		Identification and Classification of Members of the Group

Not Applicable


Item 9.		Notice of Dissolution of Group

Not Applicable


Item 10.		Certifications

(a) Not Applicable

(b) By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.


CUSIP No.		G89982105

SIGNATURE

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.


MSD Capital, L.P.
By:	MSD Capital Management LLC
Its:	General Partner

By:	/s/ Marc R. Lisker
	Name:	Marc R. Lisker
	Title:	Manager and General Counsel
Date:	February 8, 2010


MSD Energy Investments, L.P.
By:	MSD Capital, L.P.
Its:	General Partner

By:	MSD Capital Management LLC
Its:	General Partner

By:	/s/ Marc R. Lisker
	Name:	Marc R. Lisker
	Title:	Manager and General Counsel
Date:	February 8, 2010


CUSIP No.		G89982105

EXHIBIT INDEX


Exhibit		Description of Exhibit

	99.2	Joint Filing Agreement (incorporated herein by reference from Exhibit 99.1 to the Schedule 13G relating to the common shares of the issuer filed July 2, 2009 by the reporting person(s) with the Commission).