UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐     Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to §240.14a-12

TRANSATLANTIC PETROLEUM LTD.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on June 19, 2018. Meeting Information TRANSATLANTIC PETROLEUM LTD. Meeting Type: Annual General Meeting For holders as of: April 20, 2018 Date: June 19, 2018 Time: 10:00 AM CT Location: Warwick Melrose Hotel 3015 Oak Lawn Avenue Dallas, TX 75219 You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. E48075-P09820 TRANSATLANTIC PETROLEUM LTD. 16803 DALLAS PARKWAY ADDISON, TX 75001 See the reverse side of this notice to obtain proxy materials and voting instructions.

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT ANNUAL REPORT How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. . XXXX XXXX XXXX XXXX E48076-P09820 . XXXX XXXX XXXX XXXX Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before June 4, 2018 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.XXXX XXXX XXXX XXXX

Voting Items The Board of Directors recommends that you vote FOR the following proposals. 1. Election of Directors. Nominees: 1a. N. Malone Mitchell 3rd 1b. Bob G. Alexander 1c. Brian E. Bayley 1d. Charles J. Campise 1e. Gregory K. Renwick 1f. Mel G. Riggs E48077-P09820 2. Appoint PMB Helin Donovan, LLP to serve as the independent registered public accounting firm for the year ending December 31, 2018 and to authorize the audit committee to determine their remuneration. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote the shares, you must vote online or request a paper copy of the proxy materials to receive a proxy card. Your online vote or completed proxy card must be received by 11:59 PM ET on June 15, 2018. If you wish to attend and vote at the meeting, please bring this notice with you. If you wish to appoint a person to attend and vote at the meeting on your behalf, please follow the instructions online or on the proxy card to appoint such person. Note: Such other business that may properly come before the meeting.

E48078-P09820