Document:

Supplemental Indenture

 Exhibit 4.2 
 SUPPLEMENTAL INDENTURE 
 SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”), dated as of May 29, 2008, among Forbes Energy Services Ltd, a company organized under the laws of Bermuda (the “New Parent”), Forbes Energy Services LLC, a Delaware limited liability company (the
“Company”), Forbes Energy Capital Inc., a Delaware Corporation, the other Guarantors (as defined in the Indenture referred to herein) and Wells Fargo Bank, National Association, as trustee under the Indenture referred to below (the
“Trustee”). 
 W I T N E S S E T H 
 WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of February 12, 2008 providing for the issuance of 11% Senior Secured Notes due
2015 (the “Notes”); 
 WHEREAS, the Indenture provides that the New Parent shall execute and deliver to the Trustee a
supplemental indenture pursuant to which the New Parent shall become a party to the Indenture, agree to be bound by all applicable provisions of the Indenture, and unconditionally guarantee all of the Company’s Obligations under the Notes and
the Indenture on the terms and conditions set forth herein (the “Guarantee”); and 
 WHEREAS, pursuant to Section 9.01
of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture. 
 NOW, THEREFORE, in consideration of the
foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the New Parent and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 
 1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the
Indenture. 
 2. AGREEMENT TO GUARANTEE. The New Parent hereby provides an unconditional
Guarantee on the terms and subject to the conditions set forth in the Guarantee and in the Indenture including but not limited to Article 11 thereof, and subject to the limitations therein. 
 3. AGREEMENT TO BECOME A PARTY. The New Parent hereby agrees to become a party
to the Indenture and to be bound by all applicable provisions of the Indenture including but not limited to the covenants set forth under Articles 4, 5, 12 and 13 thereof. 
 4. NO RECOURSE AGAINST OTHERS. No director, officer, employee, incorporator or stockholder of
the Company or any Guarantor, as such, will have any liability for any obligations of the Company or the Guarantors under the Notes, the Indenture or the Note Guarantees or for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive liabilities under the federal
securities laws. 
 5. NEW YORK LAW TO GOVERN. THE LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THE INDENTURE, THE NOTES
AND THE NOTE GUARANTEES. 
  

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 6. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture.
Each signed copy shall be an original, but all of them together represent the same agreement. 
 7. EFFECT OF
HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof. 
 8.
THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of
which recitals are made solely by the New Parent and the Company. 
 [Remainder of page left blank intentionally] 
  

 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all
as of the date first above written. 
  

			
	FORBES ENERGY SERVICES LTD., as a Guarantor
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	FORBES ENERGY SERVICES LLC, as an Issuer
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	FORBES ENERGY CAPITAL INC., as an Issuer
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	C.C. FORBES, LLC, as a Guarantor
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	TX ENERGY SERVICES, LLC, as a Guarantor
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	SUPERIOR TUBING TESTERS, LLC, as a Guarantor
		
	By:	 	/s/ L. Melvin Cooper
		 	 L. Melvin Cooper,
 Senior Vice President and Chief
Financial Officer

	
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	/s/ Joseph P. O’Donnell
		 	Authorized Signatory

 Signature Page to Supplemental Indenture 
  

 3Notation of Guarantee

 Exhibit 4.3 
 NOTATION OF GUARANTEE 
 For value received, Forbes Energy Services Ltd. (the “New Parent”) has
unconditionally guaranteed, to the extent set forth in and subject to the provisions of that certain Indenture dated as of February 12, 2008 (the “Indenture”), among Forbes Energy Services LLC, a Delaware limited liability
company, Forbes Energy Capital Inc., a Delaware corporation (collectively, the “Issuers”), the Guarantors party thereto (the “Guarantors”) and Wells Fargo Bank, National Association, as trustee (the
“Trustee”), and that certain Supplemental Indenture dated as of May 29, 2008, among the New Parent, the Issuers, the Guarantors and the Trustee, (a) the due and punctual payment of the principal of, premium, if any, and
interest on, the Notes, whether at maturity, by acceleration, redemption or otherwise, the due and punctual payment of interest on overdue principal of and interest on the Notes, if any, if lawful, and the due and punctual performance of all other
obligations of the Company to the Holders or the Trustee all in accordance with the terms of the Indenture and (b) in case of any extension of time of payment or renewal of any Notes or any of such other obligations, that the same will be
promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration or otherwise. The obligations of the Guarantors to the Holders of Notes and to the Trustee pursuant to
the Guarantee and the Indenture, and the limitations thereon, are expressly set forth in Article 11 of the Indenture and reference is hereby made to the Indenture for the precise terms of the Guarantee. 
 Capitalized terms used but not defined herein have the meanings given to them in the Indenture. 
  

			
	FORBES ENERGY SERVICES LTD., as a Guarantor
		
	By:	 	/s/ L. Melvin Cooper
		 	 Name: L. Melvin Cooper
 Title: Senior Vice President
and Chief Financial
 OfficerAmendment No. 2 to Rights Agreement

 Exhibit 4.1 
 AMENDMENT NO. 2 TO RIGHTS AGREEMENT 
 THIS AMENDMENT NO. 2 (this “Amendment”), dated as of August 14, 2008, to the
Rights Agreement, dated as of November 17, 1998 as amended by Amendment No. 1 to the Rights Agreement dated December 11, 2000 (the “Rights Agreement”), between Nanogen, Inc., a Delaware corporation (the “Company”),
and Computershare Trust Company, N.A. (as successor rights agent to FleetBoston, N.A., successor rights agent to BankBoston, N.A.) as Rights Agent (the “Rights Agent”), is made with reference to the following facts: 
 A. The Company and the Rights Agent have heretofore entered into the Rights Agreement. Pursuant to Section 27 of the Rights Agreement, the Company
and the Rights Agent may, from time to time, supplement or amend the Rights Agreement in accordance with the provisions of such Section. 
 B. The Board of Directors of the Company has determined that it is in the best interests of the Company to amend the Rights Agreement such that, with respect to the acquisition by the shareholders of Financière Elitech S.A.S., a
société par actions simplifiée incorporated under the laws of France and registered with the Clerk of the Commercial Court of Nanterre under the number 481 676 062 (“Elitech”), and its Affiliates and Associates
(as those terms are defined in the Rights Agreement), pursuant to the Share Exchange Agreement dated August 14, 2008 (the “Elitech Share Exchange Agreement”) entered into by the Company, Elitech, and the shareholders of Elitech, no
shareholder of Elitech will become an “Acquiring Person” and no “Stock Acquisition Date” or “Distribution Date” (as such terms are defined in the Rights Agreement) will occur. 
 NOW, THEREFORE, in consideration of the foregoing and the mutual agreements set forth herein, the parties hereto agree as follows: 
 Capitalized terms used herein (including the recitals) and not defined herein shall have the meanings assigned to such terms in the Rights Agreement.

 1. Section 1(a)(ii) of the Rights Agreement is hereby amended in its entirety to read as follows: 
 (ii) the term Acquiring Person shall not mean (A) the Company, (B) any subsidiary of the Company (as such term is hereinafter defined),
(C) any employee benefit plan of the Company or any of its subsidiaries, (D) any entity holding securities of the Company organized, appointed or established by the Company or any of its subsidiaries for or pursuant to the terms of any
such plan, (E) Citigroup as a result of the acquisition by Citigroup of up to 25% of the shares of Common Stock of the Company; provided, however, that the provisions of this clause (E) shall remain in effect only so long as Citigroup
retains its status as a 13G Filer and; provided, further, if Citigroup inadvertently acquires more than 25% of the shares of Common Stock of the Company and, promptly after becoming aware of such fact, Citigroup divests a sufficient number of shares
of the 

 
Company’s Common Stock so that Citicorp’s beneficial ownership no longer exceeds 25% of the shares of the Company’s Common Stock, than the
provisions of this clause (E) shall remain in effect; or (F) any shareholder or group of shareholders (as determined pursuant to Rule 13d-5 promulgated under the Exchange Act) of Financière Elitech S.A.S., a société
par actions simplifiée incorporated under the laws of France and registered with the Clerk of the Commercial Court of Nanterre under the number 481 676 062 (“Elitech”), as a result of the acquisition by the shareholders of
Elitech of shares of Common Stock of the Company pursuant to the Share Exchange Agreement dated August 14, 2008 entered into by the Company, Elitech and the shareholders of Elitech (the “Elitech Share Exchange Agreement”); and 

2. The first sentence of Section 3(a) of the Rights Agreement is hereby amended by adding the following to the end of such sentence: 
 ; provided, further, that in no event shall a Distribution Date be deemed to occur as a result of the acquisition by any shareholder or group of
shareholders (as determined pursuant to Rule 13d-5 promulgated under the Exchange Act) of Elitech of shares of Common Stock of the Company pursuant to the Elitech Share Exchange Agreement. 

 3. No “Stock Acquisition Date” shall be deemed to occur under the Rights Agreement as a result of the
acquisition by any shareholder or group of shareholders (as determined pursuant to Rule 13d-5 promulgated under the Exchange Act) of Elitech of shares of Common Stock of the Company pursuant to the Elitech Share Exchange Agreement. 
 4. Section 22 of the Rights Agreement is hereby amended as follows: 
 (a) Insert the following new sentence after the existing first sentence thereof: 
 In the event the transfer
agency relationship in effect between the Company and the Rights Agent terminates, the Rights Agent will be deemed to have resigned automatically and be discharged from its duties under this Agreement as of the effective date of such termination,
and the Company shall be responsible for sending any required notice. 
 (b) Delete the term “having a principal office in the State of
New York or the State of California,” in its entirety. 
 5. Section 26 of the Rights Agreement is hereby amended to replace the Rights
Agent’s address for notices to: 
 Computershare Trust Company, N.A. 
 250 Royall Street 
 Canton, Massachusetts
02021 
 Attention: Client Services 
 6. Insert a
new Section 34 in the Rights Agreement as follows: 
 Force Majeure. Notwithstanding anything to the contrary contained herein,
the Rights Agent shall not be liable for any delays or failures in performance resulting from acts beyond its reasonable control including, without limitation, acts of God, terrorist acts, shortage of supply, breakdowns or malfunctions,
interruptions or malfunction of computer facilities, or loss of data due to power failures or mechanical difficulties with information storage or retrieval systems, labor difficulties, war, or civil unrest. 
 7. All amendments made to the Rights Agreement in this Amendment shall be deemed to apply retroactively as well as prospectively. 
 8. This Amendment shall be governed by and construed in accordance with the laws of the State of Delaware and for all purposes shall be governed by and construed in
accordance with all laws of such State applicable to contracts to be made and performed entirely within such State. 
 9. This Amendment may be executed in
counterparts, each of which shall be an original, but such counterparts shall together constitute one and the same instrument. 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and attested, all
as of the date and year first above written. 
  

									
	Attest:	 		 	NANOGEN, INC.
					
	By:	 	/s/ David Ludvigson	 		 	By:	 	/s/ Nicholas Venuto
	Name: David Ludvigson	 		 	Name: Nicholas Venuto
	Title: President & Chief Operating Officer	 		 	Title: Chief Financial Officer
			
	Attest:	 		 	COMPUTERSHARE TRUST COMPANY, N.A.
					
	By:	 	/s/ Jeff Seiders	 		 	By:	 	/s/ Katherine S. Anderson
	Name: Jeff Seiders	 		 	Name: Katherine S. Anderson
	Title: Relationship Manager	 		 	Title: Managing Director

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