Document:

Exhibit 4.1

 

	
  COMMON STOCK

  	
   

  	
  COMMON STOCK

  
	
   

  	
   

  	
   

  
	
  

  	
  

  	
  

  
	
   

  	
   

  	
   

  
	
  INCORPORATED UNDER THE LAWS

  	
   

  	
  SEE REVERSE FOR CERTAIN DEFINITIONS

  
	
  OF THE STATES OF DELAWARE

  	
  AmCOMP INCORPORATED

  	
  CUSIP  02342J 10 1

  
					

 

 

This is to
certify that

 

 

 

is the
owner of

 

FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $.01 PAR VALUE,
OF

 

	
  AmCOMP INCORPORATED

  

 

Transferrable on the books of the Corporation
in person or by duly authorized attorney upon surrender of this Certificate
properly endorsed. This Certificate is not valid unless countersigned and
registered by the Transfer Agent and Registrar. Witness the facsimile seal of
the Corporation and the facsimile signatures of its duly authorized officers.

 

Witness the
facsimile seal of the Corporation and the facsimile signatures of its duly
authorized officers.

 

Dated:

 

	
   

  	
   

  	
  

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  /s/ Melody
  Misiaszek

  	
  /s/ Fred R.
  Lowe 

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  SECRETARY

  	
  CHAIRMAN AND
  CHIEF EXECUTIVE OFFICER

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  

 

	
   

  	
  COUNTER
  SIGNED AND REGISTERED

  
	
   

  	
  CONTINENTAL STOCK TRANSFER & TRUST
  COMPANY

  
	
   

  	
  JERSEY
  CITY, NJ

  	
  TRANSFER
  AGENT

  AND REGISTRAR

  	
   

  
	
   

  	
  BY

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  AUTHORIZED SIGNATURE

  

 

 

AmCOMP INCORPORATED

 

THE
CORPORATION WILL FURNISH, WITHOUT CHARGE, TO EACH STOCKHOLDER WHO SO REQUESTS A
FULL STATEMENT OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE,
PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR
SERIES THEREOF AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH
PREFERENCES AND/OR RIGHTS.

 

The following
abbreviations, when used in the inscription on the face of this certificate,
shall be construed as though they were written out in full according to
applicable laws or regulations:

 

	
  TEN COM

  	
  —

  	
  as tenants
  in common

  	
  UNIF GIFT MIN ACT — 

  	
   

  	
   Custodian 

  	
   

  
	
  TEN ENT

  	
  —

  	
  as tenants
  by the entireties

  	
   

  	
  (Cust)

  	
   

  	
  (Minor)

  
	
  JT TEN

  	
  —

  	
  as joint
  tenants with right of

  	
   

  	
  under
  Uniform Gifts to Minors

  
	
   

  	
   

  	
  survivorship
  and not as tenants

  	
   

  	
  Act

  	
   

  	
   

  
	
   

  	
   

  	
  in common

  	
   

  	
   

  	
  (State)

  	
   

  
									

 

Additional abbreviations may also be used though not in the above list.

 

For value
received,         hereby sell(s),
assign(s) and transfer(s) unto

 

	
  PLEASE INSERT SOCIAL SECURITY OR OTHER

  	
   

  
	
  IDENTIFYING NUMBER OF ASSIGNEE

  	
   

  

 

 

	
   

  
	
  PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING ZIP CODE OF
  ASSIGNEE

  
	
   

  
	
   

  
	
   

  
	
                                                         Shares
  of the stock represented by the within Certificate, and do herby irrevocably
  constitute and appoint                                 

  
	
   

  
	
   

  
	
  Attorney
  to transfer the said stock on the books of the within-named Corporation with
  full power of substitution in the premises.

  
	
   

  
	
  Dated

  

 

	
   

  	
   

  
	
   

  	
  NOTICE:

  	
  THE
  SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON
  THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR WITHOUT ALTERATION OR
  ENLARGEMENT, OR ANY CHANGE WHATEVER.

  
			

 

 

Signature(s) Guaranteed:

 

	
   

  	
   

  
	
  THE
  SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
  (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
  MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO
  S.E.C. RULE 17Ad-15.QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 10.6    
    

 
  Execution Version    
    

 
 

FOURTH AMENDMENT    
    
    TO    
    
    CREDIT AGREEMENT    
    
    AMONG    
    
    LINN ENERGY, LLC,    
    
    AS BORROWER,    
    
    THE GUARANTORS,    
    

BNP PARIBAS,    
    
    AS ADMINISTRATIVE AGENT,    
    
    AND    
    
    THE LENDERS PARTY HERETO    
    
    Dated as of December 19, 2005    

 
 

FOURTH AMENDMENT TO CREDIT AGREEMENT    
    

        THIS FOURTH AMENDMENT TO CREDIT AGREEMENT (this "Fourth
Amendment") dated as of December 19, 2005, is among LINN ENERGY, LLC (formerly known as Linn Energy Holdings, LLC), a Delaware limited liability company (the
"Borrower"); each of the lenders party to the Credit Agreement referred to below (collectively, the
"Lenders"); and BNP PARIBAS, as administrative agent for the Lenders (in such capacity, together with its successors in such capacity, the
"Administrative Agent"). 

R E C I T A L S  

        A.    The
Borrower, the Administrative Agent and the Lenders are parties to that certain Credit Agreement dated as of April 13, 2005 (as amended by that certain First
Amendment to Credit Agreement and Consent, dated as of May 3, 2005, by that certain Second Amendment to Credit Agreement dated as of August 12, 2005, and by that certain Third Amendment
dated as of October 27, 2005 and as amended, supplemented or otherwise modified prior to the date hereof, the "Credit Agreement"), pursuant to
which the Lenders have made certain credit available to and on behalf of the Borrower. 

        B.    The
Borrower has requested and the Administrative Agent and the Lenders have agreed to amend certain provisions of the Credit Agreement. 

        C.    NOW,
THEREFORE, in consideration of the premises and the mutual covenants herein contained, for good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows: 

        Section 1.    Defined Terms.    Each capitalized term used herein but not otherwise defined herein has the
meaning given such term in the Credit Agreement, as amended by this Fourth Amendment. Unless otherwise indicated, all section references in this Fourth Amendment refer to sections of the Credit
Agreement. 

        Section 2.    Amendments to Credit Agreement. 

        2.1   Amendments to Section 9.01.    Subsections (a) and (b) of Section 9.01 are hereby
amended and restated in their entirety as follows: 

        (a)   Ratio of EBITDA to Interest Expense.    The Borrower will not, as of the last day of any fiscal quarter, permit
its ratio of EBITDA for the fiscal quarter then ending to Interest Expense for such fiscal quarter to be less than 2.5 to 1.0; provided that (i) for the period ending June 30, 2005,
EBITDA and Interest Expense shall be EBITDA and Interest Expense of the Borrower for the six-month period ending on such date, (ii) for the period ending September 30, 2005,
EBITDA and Interest Expense shall be EBITDA and Interest Expense of the Borrower for the nine-month period ending on such date, and (iii) for the period ending December 31,
2005, EBITDA and Interest Expense shall be EBITDA and Interest Expense of the Borrower for the twelve-month period ending on such date. 

        (b)   Current Ratio.    The Borrower will not permit, as of the last day of any fiscal quarter, its ratio of
(i) consolidated current assets (including the unused amount of the total Commitments, but excluding non-cash assets under FAS 133) to (ii) consolidated current
liabilities (excluding obligations under the Subordinated Credit Agreement, non-cash obligations under FAS 133 and current maturities under this Agreement) to be less than 1.0 to
1.0. 

        Section 3.    Conditions Precedent.    This Fourth Amendment shall not become effective until the date on which
each of the following conditions is satisfied (or waived in accordance with Section 12.02 of the Credit Agreement) (the "Effective Date"): 

        3.1   The
Administrative Agent shall have received from the Administrative Agent, all of the Lenders and each of the Obligors, counterparts (in such number as may be requested
by the Administrative Agent) of this Fourth Amendment signed on behalf of such Person. 

 

        3.2   The
Administrative Agent and the Lenders shall have received all fees and other amounts due and payable on or prior to the date hereof. 

        3.3   No
Default shall have occurred and be continuing as of the date hereof, after giving effect to the terms of this Fourth Amendment. 

        3.4   The
Administrative Agent shall have received such other documents as the Administrative Agent or their special counsel may reasonably require. 

        Section 4.    Miscellaneous. 

        4.1   Confirmation.    The provisions of the Credit Agreement, as amended by this Fourth Amendment, shall remain in
full force and effect following the effectiveness of this Fourth Amendment. 

        4.2   Ratification and Affirmation; Representations and Warranties.    Each of the Obligors hereby expressly
(i) acknowledges the terms of this Fourth Amendment, (ii) ratifies and affirms its obligations under the Guarantee Agreement and the other Security Instruments to which it is a party,
(iii) acknowledges, renews and extends its continued liability under the Guarantee Agreement and the other Security Instruments to which it is a party and agrees that its guarantee under the
Guarantee Agreement and the other Security Instruments to which it is a party remains in full force and effect with respect to the Indebtedness as amended hereby. 

        4.3   Counterparts.    This Fourth Amendment may be executed by one or more of the parties hereto in any number of
separate counterparts, and all of such counterparts taken together shall be deemed to constitute one and the same instrument. Delivery of this Fourth Amendment by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof. 

        4.4   No Oral Agreement.    This Fourth Amendment, the Credit Agreement and the other Loan Documents executed in
connection herewith and therewith represent the final agreement between the parties and may not be contradicted by evidence of prior, contemporaneous, or unwritten oral agreements of the parties.
There are no subsequent oral agreements between the parties. 

        4.5   GOVERNING LAW.    THIS FOURTH AMENDMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY AND ENFORCEABILITY HEREOF)
SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS. 

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

	BORROWER:	 	LINN ENERGY, LLC
	

 	
 	

By:	

/s/ Kolja Rockov
 Kolja Rockov

Executive Vice President & Chief Financial Officer

1

 

Guarantors are signing solely for purposes of Section 4.2 of this Fourth Amendment Agreement to ratify their obligations under the Guaranty and
Pledge Agreement.

	GUARANTORS:	 	LINN ENERGY HOLDINGS, LLC
	

 	
 	

By:	

/s/ Kolja Rockov
 Kolja Rockov

Executive Vice President & Chief Financial Officer
	

 	
 	

LINN OPERATING, INC.
	

 	
 	

By:	

/s/ Kolja Rockov
 Kolja Rockov

Executive Vice President & Chief Financial Officer
	

 	
 	

MID ATLANTIC WELL SERVICE, INC.
	

 	
 	

By:	

/s/ Kolja Rockov
 Kolja Rockov

Executive Vice President & Chief Financial Officer

2

 

	ADMINISTRATIVE AGENT:	 	BNP PARIBAS,

as Administrative Agent
	

 	
 	

By:	

/s/ Douglas R. Liftman

	 	 	Name: Douglas R. Liftman

            Managing Director
	

 	
 	

By:	

/s/ Betsy Jocher

	 	 	Name: Betsy Jocher

Title:   Vice President
	

LENDERS:	
 	

BNP PARIBAS
	

 	
 	

By:	

/s/ Douglas R. Liftman

	 	 	Name: Douglas R. Liftman

Title:   Managing Director
	

 	
 	

By:	

/s/ Betsy Jocher

	 	 	Name: Betsy Jocher

Title:   Vice President
	

 	
 	

ROYAL BANK OF CANADA
	

 	
 	

By:	

/s/ Jason York

	 	 	Name: Jason York

Title:   Authorized Signatory
	

 	
 	

COMERICA BANK
	

 	
 	

By:	

/s/ Huma Vadgama

	 	 	Name: Huma Vadgama

Title:  Vice President
	

 	
 	

SOCIETE GENERALE
	

 	
 	

By:	

/s/ Graeme Bullen

	 	 	Name: Graeme Bullen

Title:   Director

3

QuickLinks

Exhibit 10.6

Execution Version

FOURTH AMENDMENT TO CREDIT AGREEMENT AMONG LINN ENERGY, LLC, AS BORROWER, THE GUARANTORS, BNP PARIBAS, AS ADMINISTRATIVE AGENT, AND THE LENDERS PARTY HERETO Dated as of December 19, 2005

FOURTH AMENDMENT TO CREDIT AGREEMENT

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