Document:

Participating Interest Agreement

 Exhibit 4.3 
 PARTICIPATING INTEREST AGREEMENT 
 THIS PARTICIPATING INTEREST AGREEMENT (this
“Agreement”) made as of July 11, 2005 (the “Effective Date”) 
 BETWEEN 
 TRANSATLANTIC WORLDWIDE LTD., a Bahamian corporation (the “Grantor”) 
 - and - 
 SCOTT C. LARSEN, an individual
residing in Dallas, Texas (the “Grantee”) 
 - and - 
 TRANSATLANTIC PETROLEUM CORP., an Alberta corporation (the “Guarantor”) 
 WHEREAS the Grantor has entered into the TWL Compensation Agreement (the “TWL Compensation Agreement”) dated June 20, 2005 with
Tetrarch Limited (“Tetrarch”) (a copy of which is attached hereto as Exhibit A and incorporated herein by reference for all purposes) pursuant to which Tetrarch has agreed to compensate the Grantor for a certain service
agreement which Tetrarch was successful in entering into; 
 AND WHEREAS the Grantor wishes to compensate the Grantee for his efforts in
securing the compensation arrangements with Tetrarch by granting the Grantee an interest in any monies which may be received by the Grantor pursuant to the TWL Compensation Agreement; 
 AND WHEREAS the parties hereto have provided hereinafter the terms and conditions on which such interest is to be received by the Grantee; 
 AND WHEREAS Guarantor has agreed to join in this Participating Interest Agreement for the sole purpose of guaranteeing the performance of Grantor
hereunder; 
 NOW THEREFORE THIS AGREEMENT WITNESSES that the parties hereto agree as follows: 
 1. Participating Interest. The Grantor hereby reserves in favour of the Grantee an interest in any TWL Compensation (as that term is defined in
the TWL Compensation Agreement) actually received by the Grantor (the “Participating Interest”) which Participating Interest shall be equal to 3.87% of any TWL Compensation received by the Grantor from time to time, subject to the
following terms and conditions: 
  

	 	(a)	The Participating Interest shall be free and clear of all liens, claims or encumbrances. 

  

	 	(b)	 Each payment with respect to the Participating Interest shall be made within thirty (30) days of actual receipt by the Grantor of any payment 

	 	 
from Tetrarch pursuant to the TWL Compensation Agreement. For greater certainty, the Grantor’s obligation to pay the Participating Interest to the
Grantee only arises if, as and when payment(s) are received by the Grantor pursuant to the TWL Compensation Agreement. 

  

	 	(c)	Subject to Paragraph 2 below, the Participating Interest shall remain in force and effect until the Grantee shall have received the sum of U.S.$599,850 (the “Maximum
Interest”) from the Grantor pursuant to the terms of this Agreement. 

  

	 	(e)	The Grantee shall have no right to assign, sell, transfer or convey, however accomplished (whether directly or indirectly), the Participating Interest granted under this Agreement
without the prior written consent of the Grantor. 

 2. Reduction of Maximum Interest. The Grantee acknowledges and
agrees that the Grantor has entered into a Security and Pledge Agreement with Summit Oil Limited dated June 20, 2005 (the “Summit Pledge Agreement”) pursuant to which the Grantor has pledged all of its interest in and rights to
receive payments under the TWL Compensation Agreement. The Grantee further agrees that in the event that any portion of the TWL Compensation is paid by Tetrarch to Summit Oil Limited in accordance with the terms of the Summit Pledge Agreement and
such payment results in a reduction of the Maximum Sum (as that term is defined in the TWL Compensation Agreement) payable to the Grantor, the Maximum Interest of the Grantee under this Agreement shall be reduced by the same percentage as the
Maximum Sum is reduced under the TWL Compensation Agreement. 
 3. No Warranties. This Agreement is made without warranty of any kind
or nature. 
 4. Taxes. The Grantee agrees that he will be liable for all taxes in respect of amounts received by the Grantee
attributable to the Participating Interest. The Grantee further acknowledges and agrees that the Grantor shall have the right to deduct from any payment required to be made to the Grantee pursuant to this Agreement and withhold any and all amounts
that the Corporation is obliged to withhold and remit to the relevant taxing authority. 
 5. Agreement to Provide Information. Under
the terms of the TWL Compensation Agreement, Tetrarch is obligated to provide to the Grantor, a Quarterly Statement (as that term is defined in the TWL Compensation Agreement). While this Agreement is in force and effect, the Grantor hereby agrees
to provide a copy of the Quarterly Statement to the Grantee no later than thirty (30) days from the date the Grantor receives each such Quarterly Statement. 
 6. GOVERNING LAW. THE VALIDITY, EFFECT AND CONSTRUCTION OF THIS AGREEMENT SHALL BE GOVERNED BY THE LAWS OF THE STATE OF TEXAS, EXCLUDING ITS CONFLICT OF LAWS PRINCIPLES. 
 7. Notice. All notices and other communications required or permitted under this Agreement (except for Quarterly Statements provided for under
Paragraph 5 above which may be sent by regular mail) shall be in writing and any communication or delivery hereunder shall 

 
be deemed to have been duly given and received when actually delivered to the address set forth below for the party to be notified, or when a legible
facsimile copy is received by the party’s facsimile equipment at the number shown below: 
  

			
	 If to the Grantor:
	 	c/o TransAtlantic Petroleum (USA) Corp.
		 	5910 N. Central Expressway, Suite 1755
		 	Dallas, TX 75206
		 	FAX: 214-220-4327
		
	 With a copy to:
	 	Such other persons as the Grantor may designate in writing.
		
	 If to the Grantee:
	 	Scott C. Larsen
		 	6229 Orchid Lane
		 	Dallas, Texas 75230
		 	FAX: 214-363-3868

 A party may, by written notice so delivered to the other, change the address or facsimile number
to which delivery shall thereafter be made. 
 8. No Waiver. The failure of any party to insist upon strict performance of a covenant
hereunder or of any obligation hereunder, irrespective of the length of time for which such failure continues, shall not be a waiver of such party’s right to demand strict compliance in the future. No consent or waiver, express or implied, to
or of any breach or default in the performance of any obligation hereunder shall constitute a consent or waiver to or of any other breach or default in the performance of the same or any other obligation hereunder. 
 9. Arbitration. Any dispute arising out of or relating to this Agreement, including any question regarding its existence, validity or termination,
shall be shall be resolved by binding arbitration administered by the American Arbitration Association (AAA). Confirmation and judgment upon the award rendered by the arbitrator(s) may be entered by any state or federal court having jurisdiction
thereof. The place of arbitration shall be Dallas, Texas and all proceedings shall be conducted in the English language. A dispute shall be deemed to have arisen when any party gives notice to the other party to that effect. 
 10. Amendments. This Agreement may not be amended nor any rights hereunder waived except by an instrument in writing signed by the party to be
charged with such amendment or waiver and delivered by such party to the party claiming the benefit of such amendment or waiver. 
 11.
Headings. The headings of the paragraphs of this Agreement are for guidance and convenience of reference only and shall not limit or otherwise affect any of the terms or provisions of this Agreement. 
 12. Counterparts. This Agreement may be executed by Grantor and Grantee in counterparts, each of which shall be deemed an original instrument but
all of which together shall constitute but one and the same instrument. 

 13. Entire Agreement. This Agreement (including the exhibits hereto) constitutes the entire
understanding between the parties with respect to the subject matter hereof, superseding all negotiations, prior discussions and prior agreements and understandings relating to such subject matter. 
 14. Parties in Interest. This Agreement and all its terms, provisions, conditions, covenants and warranties shall be binding upon and shall inure
to the benefit of the parties hereto and their respective heirs, successors and permitted assigns. Nothing contained in this Agreement, express or implied, is intended to confer upon any other person or entity any benefits, rights or remedies.

 15. Guarantee. For good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, Guarantor
unconditionall and irrevocably guarantees to Grantee the due and punctual performance of Grantor’s obligations under this Agreement 
 IN WITNESS WHEREOF the parties hereto have duly executed this Agreement as of the Effective Date. 
  

			
	TransAtlantic Worldwide Ltd.
		
	 By:
	 	 
	Name:	 	Chris H. Lloyd
	 Title:
	 	Chief Financial Officer

  
  

							
	 	 		 		 	 
	Witness	 		 		 	Scott C. Larsen
	 	 		 		 	
	 Name of Witness
	 		 		 	
	 	 		 		 	
	 Address of Witness
	 		 		 	

  

			
	TransAtlantic Petroleum Corp.
		
	 By:
	 	 
	Name:	 	Michael Winn
	 Title:
	 	Chairman

			
	 STATE OF TEXAS
	  	§
		  	§
	COUNTY OF DALLAS	  	§

 The foregoing instrument was acknowledged before me on
                            , 2006 by
                                    , of TransAtlantic
Worldwide Ltd., a Bahamian corporation, on behalf of said corporation. 
  

							
		 		 		 	  

		 		 		 	Notary Public in and for
		 		 		 	the State of Texas
	My Commission Expires:	 		 		 	  

		 		 		 	Printed Name of Notary

  
  

			
	 STATE OF CALIFORNIA
	  	§
		  	§
	COUNTY OF                 	  	§

 The foregoing instrument was acknowledged before me on
                            , 2006 by Michael Winn, of TransAtlantic Petroleum Corp., an Alberta
corporation, on behalf of said corporation. 
  

							
		 		 		 	  

		 		 		 	Notary Public in and for
		 		 		 	the State of California
	My Commission Expires:	 		 		 	  

	 	 		 		 	Printed Name of NotaryAmended and Restated Stock Option Plan

 Exhibit 4.4 
 TRANSATLANTIC PETROLEUM CORP. 
 Amended and Restated Stock Option Plan (2006)1 
 The following sets forth the terms and conditions of the Amended and Restated Stock Option Plan (the “Plan”) adopted by the Board of Directors of TransAtlantic Petroleum Corp. (the “Corporation”) and approved by the
shareholders of the Corporation which shall govern the issuance of stock options (the “Stock Options”) to employees, directors and officers of, and persons and companies who provide services to the Corporation and subsidiaries of the
Corporation: 
  

	1.	Purpose 

 The principal purposes of the Plan are: 

 

	 	(a)	to promote a proprietary interest in the Corporation among its employees, officers and directors and persons and companies providing services to the Corporation;

  

	 	(b)	to retain and attract the qualified personnel and service support the Corporation requires; 

  

	 	(c)	to provide an incentive element in compensation; and 

  

	 	(d)	to promote the profitability of Corporation. 

  

	2.	Reservation of Shares 

 Subject to Section 11 of this
Plan, the maximum number of common shares of the Corporation (the “Common Shares”) issuable pursuant to Stock Options outstanding under the Plan, and under any other security based compensation arrangements the Corporation may have from
time to time, for Eligible Optionees (as hereinafter defined) shall not exceed 10% of the aggregate number of issued and outstanding Common Shares, on a non-diluted basis, at the time of grant. If the Corporation’s Common Shares are listed on
the Toronto Stock Exchange (the “TSX”), any amendment to the fixed maximum percentage of Common Shares reserved for issuance pursuant to the exercise of stock options shall be approved by the TSX and the shareholders of the Corporation.
For greater certainty, the reloading of the Common Shares authorized for issuance after the exercise of a Stock Option under the Plan does not require TSX or shareholder approval. 
  

	3.	Eligibility 

 Stock Options shall be granted only to persons,
firms or companies (“Eligible Optionees”) who are: 
  

	 	(a)	bona fide employees (full-time or part-time), officers or directors of the Corporation or of a subsidiary of the Corporation; or 

  

	 	(b)	consultants who are engaged to provide services to the Corporation or a subsidiary of the Corporation under a written contract and spend or will spend a significant amount
of time and attention on the affairs and business of the Corporation or its subsidiaries. 

	 1
	 The Amended and Restated Stock Option Plan (2006) replaced the Stock Option
Plan (1995) effective May ·, 2006 and reflects the adoption of a “rolling” plan rather than a plan with a fixed maximum number of
common shares reserved for issuance pursuant to stock options. The amendment was approved by the Toronto Stock Exchange on ·, 2006.

	4.	Granting of Stock Options 

 The Board of Directors of the
Corporation may from time to time grant Stock Options to Eligible Optionees. At the time a Stock Option is granted, the Board of Directors shall determine the number of Common Shares of the Corporation purchasable under the Stock Option, the date
when the Stock Option is to become effective and, subject to the other provisions of this Plan, all other terms and conditions of the Stock Option. An Eligible Optionee may hold more than one Stock Option at any time, provided, however, the Stock
Options granted, together with all of the Corporation’s other previously established or proposed security based compensation arrangements, may not result at any time in: 
  

	 	(a)	the aggregate number of Common Shares reserved for issuance to any one person exceeding 5% of the outstanding issue; 

  

	 	(b)	the issuance to any one insider of the Corporation and such insider’s associates (as defined in the Securities Act (Ontario)), within any one year period of an aggregate
number of Common Shares exceeding 5% of the outstanding issue; 

  

	 	(c)	the aggregate number of Common Shares reserved for issuance to insiders exceeding 10% of the outstanding issue; or 

  

	 	(d)	[the issuance to insiders, within a one year period, of an aggregate number of Common Shares exceeding 10% of the outstanding issue]. 

 The terms “insider” and “security based compensation arrangement” shall have the meaning given in the TSX policies relating to security based
compensation arrangements and the term “outstanding issue” means the number of Common Shares issued and outstanding, on a non-diluted basis, immediately prior to a particular share issuance, excluding Common Shares issued pursuant to
security based compensation arrangements of the Corporation over the preceding one year period. 
  

	5.	Exercise Price 

 The exercise price of each Stock Option
shall be determined in the discretion of the Board of Directors of the Corporation at the time of the granting of the Stock Option, provided that the exercise price shall not be lower than the “Market Price. “Market Price” shall mean
the closing price of the Common Shares on the TSX on the trading day immediately prior to the date the Stock Option is granted, or, if there is no reported trade of the Common Shares on the TSX on such date, the arithmetic average of the closing bid
and the closing ask for the Common Shares on the TSX on such date; provided that in the event the Common Shares are not listed on the TSX but are listed on another stock exchange or stock exchanges, the foregoing references to the TSX shall be
deemed to be references to such other stock exchange or if more than one, to such one as shall be designated by the Board of Directors of the Corporation and in the event the Common Shares are not listed on any exchange, the Market Price shall be
such price as is determined by the Board of Directors, in good faith. 
  

	6.	Term and Exercise Periods 

 Subject to Section 7 hereof,
all Stock Options shall be for a term and exercisable from time to time as determined in the discretion of the Board of Directors of the Corporation at the time of the granting of the Stock Options, provided that (i) no Stock Option shall have
a term exceeding ten (10) years, and (ii) where a Stock Option has been granted for a specific service, such Stock Option may be exercisable only after the completion of that service. Without limiting the generality of the foregoing or the
discretion of the Board of Directors and subject to Section 7 hereof, the Board of Directors may, by way of example, 

 
determine that a Stock Option is exercisable only during the term of employment of the Eligible Optionee receiving it or during such term and for a limited
period of time after termination of employment, that a Stock Option can be exercisable for a period of time or for its remaining term after the death or incapacity of an Eligible Optionee, that only a portion of a Stock Option is exercisable in a
specified period, that the unexercised portion of a Stock Option is “cumulative” so that any portion of a Stock Option exercisable (but not exercised) in a specified period may be exercised in subsequent periods until the Stock Option
terminates, or that a Stock Option may provide for early exercise and/or termination or other adjustment in the event of a death of a person and in other circumstances, such as if the Corporation shall resolve to sell all or substantially all of its
assets, to liquidate or dissolve, or to merge, amalgamate, consolidate or be absorbed with or into any other corporation, if a take over bid is made for the Common Shares or if any change of control of the Corporation occurs. 
  

	7.	Expiry in Certain Circumstances 

 In the case of a Stock
Option granted to an officer or director of the Corporation in their capacity as such, if such Eligible Optionee ceases to be an officer or director of the Corporation prior to the expiry of the term of the Stock Option (other than in the event of
the death or incapacity of the Eligible Optionee), such Stock Option may only be exercised, as to those Common Shares in respect of which the Stock Option has not been exercised, at any time up to and including the earlier of (i) a date three
(3) months after the date the Eligible Optionee ceases to be an officer or director of the Corporation; or (ii) the expiry of the term of the Stock Option. Where a Stock Option has been granted to an Eligible Optionee, in the event of the
death or incapacity of the Eligible Optionee on or prior to the expiry of the term of the Stock Option, the Stock Option may only be exercised, as to those Common Shares in respect of which the Stock Option has not been exercised, by the legal
personal representatives of the Eligible Optionee at any time up to and including the earlier of (i) a date twelve (12) months following the date of the death or incapacity of the Eligible Optionee; or (ii) the expiry of the term of
the Stock Option. 
  

	8.	Non-Assignability 

 Stock Options shall not be assignable or
transferable by an Eligible Optionee except for a limited right of assignment to allow the exercise of Stock Options by an Eligible Optionee’s legal representative in the event of death or incapacity. 
  

	9.	Payment of Exercise Price 

 All Common Shares issued pursuant
to the exercise of a Stock Option shall be paid for in full at the time of exercise of the Stock Option and prior to the issue of the Common Shares. All Common Shares issued in accordance with the foregoing shall be issued as fully paid and
non-assessable Common Shares. 
  

	10.	Non-Exercise 

 If any Stock Option granted pursuant to the
Plan is not exercised for any reason whatsoever, the Common Shares reserved for issuance pursuant to such Stock Option shall revert to the Plan and shall be available for other Stock Options, however, at no time shall there be outstanding Stock
Options exceeding in the aggregate the number of Common Shares authorized for issuance pursuant to Stock Options under this Plan. 
  

	11.	Adjustment in Certain Circumstances 

 In the event:

  

	 	(a)	of any change in the Common Shares through subdivision, consolidation, reclassification, amalgamation, merger or otherwise; or 

  

	 	(b)	of any stock dividend to holders of Common Shares (other than such stock dividends issued at the option of shareholders of the Corporation in lieu of substantially equivalent cash
dividends); or 

  

	 	(c)	that any rights are granted to all or substantially all of the holders of Common Shares to purchase Common Shares at prices substantially below fair market value; or

  

	 	(d)	that as a result of any recapitalization, merger, consolidation or otherwise the Common Shares are converted into or exchangeable for any other shares; 

 then in any such case the Board of Directors of the Corporation may make such adjustment in the Plan and in the Stock Options granted under the Plan as the Board of
Directors of the Corporation may in its sole discretion deem appropriate to prevent substantial dilution or enlargement of the rights granted to, or available for, holders of Stock Options, and such adjustments may be included in the Stock Options.

  

	12.	Expenses 

 All expenses in connection with the Plan shall be
borne by the Corporation. 
  

	13.	Compliance with Laws 

 The Corporation shall not be obligated
to issue any shares upon exercise of Stock Options if the issue would violate any law or regulation or any rule of any governmental authority or stock exchange. The Corporation shall not be required to issue, register or qualify for resale any
shares issuable upon exercise of Stock Options pursuant to the provisions of a prospectus or similar document, provided that the Corporation shall notify the TSX and any other appropriate regulatory bodies in Canada of the existence of the Plan and
the issuance and exercise of Stock Options. 
  

	14.	Form of Stock Option Agreement 

 All Stock Options shall be
issued by the Corporation in a form which meets the general requirements and conditions set forth in this Plan. 
  

	15.	Amendments and Termination of Plan 

 The Corporation shall
retain the right to amend from time to time or to terminate the terms and conditions of the Plan or Stock Options granted thereunder by resolution of the Board of Directors of the Corporation. Any amendments shall be subject to the prior consent of
any applicable regulatory bodies, including the TSX. Any amendments to the Plan or Stock Options shall take effect only with respect to Stock Options issued thereafter, provided that they may apply to any unexercised Stock Options previously issued
with the mutual consent of the Corporation and the Eligible Optionees holding such Stock Options. In addition to any other amendments which the TSX may permit without shareholder approval, the Board of Directors shall have the power and authority to
approve amendments relating to the Plan or to Stock Options, without further approval of the shareholders, to the extent that such amendments relate to: 

	 	(a)	altering the terms and conditions of vesting applicable to any Stock Options; 

  

	 	(b)	extending the term of Stock Options held by a person other than an insider of the Corporation, including in the circumstances set forth in Section 7, provided that the term
does not extend beyond ten years from the date of grant; 

  

	 	(c)	accelerating the expiry date in respect of Stock Options; 

  

	 	(d)	adding a cashless exercise feature, payable in cash or Common Shares; 

  

	 	(e)	determining the adjustment provisions pursuant to Section 11 hereof; 

  

	 	(f)	amending the definitions contained within the Plan; or 

  

	 	(g)	amending or modifying the mechanics of exercise of the Stock Options. 

  

	16.	Administration 

 The Plan shall be administered by the Board
of Directors. The Board of Directors shall have full and final discretion to interpret the provisions of the Plan and to prescribe, amend, rescind and waive rules and regulations to govern the administration and operation of the Plan. All decisions
and interpretations made by the Board of Directors shall be binding and conclusive upon the Corporation and on all persons eligible to participate in the Plan, subject to shareholder approval if required by the TSX. 
  

	17.	Delegation of Administration of the Plan 

 Subject to the
Business Corporations Act (Alberta) or any other legislation governing the Corporation, the Board of Directors may delegate to one or more directors of the Corporation, on such terms as it considers appropriate, all or any part of the powers,
duties and functions relating to the granting of Stock Options and the administration of the Plan. 
  

	18.	Applicable Law 

 This Plan shall be governed by and construed
in accordance with the laws in force in the Province of Alberta. 
  

	19.	Predecessor Plan 

 Options outstanding under the predecessor
stock option plan of the Corporation will remain in effect and be exercisable in accordance with their terms and will be deemed to be issued under the terms of this Plan.

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