UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 4, 2014

TRANSATLANTIC PETROLEUM LTD.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (214) 220-4323

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

The information set forth below under Item 8.01 is hereby incorporated by reference.

The information set forth below under Item 8.01 is hereby incorporated by reference.

TransAtlantic Petroleum Ltd. (the “Company”) held a special meeting of shareholders on March 4, 2014 (the “Special Meeting”) to approve an amendment to the Company’s share capital to effect a consolidation (reverse stock split) of the Company’s outstanding common shares at a ratio of one-for-ten (1:10), together with a corresponding proportional reduction in the number of authorized common shares and proportional increase in par value for such authorized common shares (“Proposal 1”).

The table below shows the final results of the voting at the Special Meeting:

On March 4, 2014, at the Special Meeting, the Company’s shareholders approved an amendment to the Company’s share capital to effect a consolidation (reverse stock split) of the Company’s outstanding common shares at a ratio of one-for-ten (1:10), together with a reduction in the number of authorized common shares from 1.0 billion shares to 100.0 million shares and an increase in the par value of the common shares from $0.01 per share to $0.10 per share. As a result, every ten common shares of the Company have been combined into one common share, reducing the number of outstanding common shares of the Company from approximately 374.0 million to approximately 37.4 million. Each shareholder’s percentage ownership in the Company and proportional voting power remains unchanged after the reverse stock split, except for minor changes and adjustments resulting from the treatment of fractional shares.

On March 6, 2014, the Company filed an Altered Memorandum of Continuance with the Bermuda Registrar of Companies and amended its Bye-Laws to implement the reverse stock split and the change to its number of authorized common shares and par value per common share. A copy of the Company’s Altered Memorandum on Continuance is attached hereto as Exhibit 3.1 and is incorporated herein by reference, and a copy of the Company’s Amended Bye-Laws is attached hereto as Exhibit 3.2 and is incorporated herein by reference.

The Company expects that its common shares will begin trading on a split-adjusted basis on the NYSE MKT under the Company’s existing symbol “TAT” upon the opening of the NYSE MKT on March 7, 2014 and on the Toronto Stock Exchange under the Company’s existing symbol “TNP” upon the opening of the TSX on March 7, 2014.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: March 6, 2014

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EXHIBIT INDEX

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