Document:

Form of Amendment No. 1 to Principal Participation Agreement

 Exhibit 10.2 
 AMENDMENT NO. 1 TO 
 PRINCIPAL PARTICIPATION AGREEMENT 
 This Amendment No. 1 to Principal Participation Agreement (this “Amendment”), dated June 30, 2008, is being entered into by
each of the participants identified on the signature pages hereto (each an “Amending Participant”) and Thornburg Mortgage, Inc. (the “Company”) pursuant to the principal participation agreement, dated
as of March 31, 2008 (the “PPA”), by and between the Company and each of the participants designated on the signature pages thereto as a “Participant”. Unless otherwise defined herein, capitalized terms shall
have the meaning given to them in the PPA, or if not defined therein, in the Purchase Agreement, dated March 31, 2008 (the “Purchase Agreement”), among the Company and the various “Subscribers” identified on
the signature pages thereto. 
 WHEREAS, on the date hereof the Company is entering into that certain Amendment No. 1 to Purchase
Agreement and Consent of Majority Participants in order to, among other things, extend the deadline for the Second Closing and is also entering into that certain Amendment No. 1 to Escrow Agreement in order to continue to permit the Escrow
Agent to hold the Escrow Amounts until September 30, 2008 under the Escrow Agreement; and 
 WHEREAS, the Company is hereby requesting
this Amendment to reflect the amendments to the Purchase Agreement; 
 NOW THEREFORE, in consideration of the foregoing and the covenants set
forth herein and in the PPA and other good and valuable consideration, the Company and the Amending Participants do hereby agree as follows. 
 SECTION 1.
AMENDMENTS 
 Section 1.1 Amendment of Definition of “Purchase Agreement”. The definition of “Purchase
Agreement” is hereby amended by adding the following language at the end thereof: “as amended from time to time or as consented to by the Majority Participants.” 
 Section 1.2 Incorporated Terms and Definitions: For the avoidance of doubt, all definitions and other provisions of the Purchase Agreement
incorporated into the PPA shall be to the Purchase Agreement as amended from time to time or as otherwise consented to by the Majority Participants. 
 SECTION 2. MISCELLANEOUS 
 Section 2.1. Effect of Amendment. It is understood and agreed that, except as
expressly amended hereby, this Amendment will not: (i) limit, impair, constitute a waiver of or otherwise affect any right, power or remedy of any party under the PPA or the transactions and covenants contemplated thereunder; or
(ii) constitute a waiver of any provision in the PPA or any transactions and covenants contemplated thereunder. The PPA, as modified and amended by the Amendment, is hereby ratified and confirmed in all respects and all the terms conditions and
provisions thereof shall remain in full force and effect in accordance with its terms. 

 Section 2.2. Successors and Assigns. This Amendment shall be binding upon and inure to the
benefit of (i) the Company and its successors and assigns and (ii) the Amending Subscribers and their respective successors and assigns. 
 Section 2.3. Governing Law. This Amendment shall be governed by and construed in accordance with New York law, including all matters of construction, validity and performance. 
 Section 2.4. Counterparts. This Amendment may be executed in any number of counterparts, each executed counterpart constituting an original
but all together only one agreement. 
 Section 2.5. Severability. If any provision of this Amendment shall be or shall be
held or deemed by a final order by a competent authority to be invalid, inoperative or unenforceable, such circumstance shall not have the effect of rendering any other provision or provisions herein contained invalid, inoperative or unenforceable,
but this Amendment shall be construed as if such invalid, inoperative or unenforceable provision had never been contained herein so as to give full force and effect to the remaining such terms and provisions. 
 [Signature Page Follows] 

 IN WITNESS WHEREOF, this Amendment is agreed and accepted as of the day and year
first above written. 
  

			
	Thornburg Mortgage, Inc.
		
	 By:
	 	  

	 Name:
	 	  

	 Title:
	 	  

			
	Participant:
		
	Company Name:	 	  

  

			
	 By:
	 	  

	 Name:
	 	  

	 Title:Form of Amendment No. 1 to Escrow Agreement

 Exhibit 10.3 
 AMENDMENT NO. 1 TO ESCROW AGREEMENT 
 This Amendment No. 1 to Escrow Agreement (this
“Amendment”), dated June 30, 2008, is being entered into by each of the escrow subscribers identified on the signature pages hereto (each an “Amending Subscriber”), Thornburg Mortgage, Inc. (the
“Company”) and Wilmington Trust Company, as escrow agent (“Escrow Agent”), pursuant to the escrow agreement, dated as of March 31, 2008 (the “Escrow Agreement”), by and
among the Company, the Escrow Agent and each of the investors designated on the signature pages thereto as a “Subscriber”. Unless otherwise defined herein, capitalized terms shall have the meaning given to them in the Escrow Agreement.

 WHEREAS, the terms of the Purchase Agreement dated March 31, 2008 (the “Purchase Agreement”), among the
Company and the subscribers designated on the signature pages thereto, as modified by the consent of the Majority Participants dated April 4, 2008, provide that the Company shall use its best efforts to commence and complete by June 30,
2008, self-tenders for at least 90% of the aggregate liquidation preference of its outstanding preferred stock and at least 66 2/3% of the aggregate liquidation preference of each series of its outstanding preferred stock (the “Tender
Offer”), at a price of $5 in cash per $25 of liquidation preference plus, if the Shareholder Approval is obtained, shares of Common Stock representing in the aggregate 5% of the Common Stock outstanding on a fully diluted basis after
giving effect to such issuance and all anti-dilution adjustments under all existing instruments and agreements; 
 WHEREAS, pursuant to
Section 6.2 of the Purchase Agreement, the completion of the Tender Offer is a condition to the Second Closing (as defined in the Purchase Agreement); 
 WHEREAS, pursuant to Section 1.2(a) of the Purchase Agreement, the Second Closing must occur by June 30, 2008; 
 WHEREAS, the Subscribers have placed funds into escrow (the “Escrow Amounts”) to fund the cash portion of the Tender Offer pursuant to the Escrow Agreement; 
 WHEREAS, Section 1.2(c) of the Purchase Agreement provides that the Escrow Amount is to be returned to the Escrow Subscribers in the event the
Second Closing does not occur by June 30, 2008, and the Company does not anticipate having sufficient liquidity to fund the cash portion of the Tender Offer consideration without the use of the Escrow Amounts; 
 WHEREAS, the Company will not be able to complete the Tender Offer prior to June 30, 2008, and as a result the Second Closing will not occur by that
date; 
 WHEREAS, on the date hereof, the Company is also entering into that certain Amendment No. 1 to Purchase Agreement and Consent
of Majority Participants in order to, among other things, extend the deadline for the Second Closing under the Purchase Agreement; and 
 WHEREAS, the Company is hereby requesting the following amendments to the Escrow Agreement, to extend the date by which the Company must complete the Tender Offer from June 30, 2008 to September 30, 2008 and to retain the Escrow
Amounts under the Escrow Agreement until such date; 

 NOW THEREFORE, in consideration of the foregoing and the covenants set forth herein and in the Escrow
Agreement and other good and valuable consideration, the Company and the Amending Subscribers do hereby agree as follows. 
 SECTION 1. AMENDMENTS 
 Section 1.1 Amendment of Section III(a)(i)(B). Section III(a)(i)(B) of the Escrow Agreement is
hereby amended by deleting the reference to “June 30, 2008” therein and replacing such reference with “September 30, 2008”. 
 Section 1.2 Amendment of Section III(a). Section III(a) of the Escrow Agreement is hereby amended by deleting the reference to “June 30, 2008” in the proviso to such Section and replacing such reference with
“September 30, 2008”. 
 SECTION 2. MISCELLANEOUS 
 Section 2.1. Effect of Amendment. It is understood and agreed that, except as expressly amended hereby, this Amendment will not:
(i) limit, impair, constitute a waiver of or otherwise affect any right, power or remedy of any party under the Escrow Agreement or the transactions and covenants contemplated thereunder; or (ii) constitute a waiver of any provision in the
Escrow Agreement or any transactions and covenants contemplated thereunder. The Escrow Agreement, as modified and amended by the Amendment, is hereby ratified and confirmed in all respects and all the terms conditions and provisions thereof shall
remain in full force and effect in accordance with its terms. 
 Section 2.2. Successors and Assigns. This Amendment shall be
binding upon and inure to the benefit of (i) the Company and its successors and assigns and (ii) the Amending Subscribers and their respective successors and assigns. 
 Section 2.3. Governing Law. This Amendment shall be governed by and construed in accordance with Delaware law, including all matters of
construction, validity and performance. 
 Section 2.4. Counterparts. This Amendment may be executed in any number of
counterparts, each executed counterpart constituting an original but all together only one agreement. 
 Section 2.5.
Severability. If any provision of this Amendment shall be or shall be held or deemed by a final order by a competent authority to be invalid, inoperative or unenforceable, such circumstance shall not have the effect of rendering any other
provision or provisions herein contained invalid, inoperative or unenforceable, but this Amendment shall be construed as if such invalid, inoperative or unenforceable provision had never been contained herein so as to give full force and effect to
the remaining such terms and provisions. 
 [Signature Page Follows] 

 IN WITNESS WHEREOF, this Amendment is agreed and accepted as of the day and year
first above written. 
  

			
	Thornburg Mortgage, Inc.
		
	 By:
	 	  

	 Name:
	 	  

	 Title:
	 	  

  

			
	Wilmington Trust Company
		
	 By:
	 	  

	 Name:
	 	  

	 Title:
	 	  

			
	ESCROW SUBSCRIBER:
		
	 Company Name:
	 	  

			
		
	 By:
	 	  

	 Name:
	 	  

	 Title:
	 	  

	
	
	 Escrow Amount $

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