Document:

Amendment to Change in Control Agreement

 Exhibit 10.4 
 AMENDMENT TO AGREEMENT 
 (between ABIOMED, INC. and MICHAEL R. MINOGUE) 
 The Agreement dated April 5, 2004, (the “Agreement”) by and between ABIOMED, Inc., a Delaware corporation (the
“Company”) and Michael R. Minogue, a key employee and executive of the Company (the “Executive”), which is Exhibit B to the Employment Agreement of the same date between the Company and the Executive, is hereby
amended as follows: 
 WHEREAS, as of January 1, 2005, a new section 409A was added to the Internal Revenue Code of 1986, as
amended, and as of January 1, 2009, any arrangement providing for “deferred compensation” as defined by such section and the guidance issued thereunder (collectively “Section 409A”), must be in full compliance with
Section 409A; and 
 WHEREAS, the Executive and the Company have agreed that the Agreement be amended as described below in order
to be in full compliance with Section 409A; 
 NOW, THEREFORE, it is agreed as follows: 
 1. Section 4(b)(ii) of the Agreement shall be amended by deleting the last sentence of such section and replacing it with the following: 

Each such Annual Bonus shall be paid no later than the fifteenth day of the third month of the fiscal year next following the fiscal year for which
the Annual Bonus is awarded. 
 2. Section 4(b)(vi) of the Agreement shall be amended by adding the following sentence at the end of
such section: 
 Notwithstanding anything in this Agreement to the contrary, to the extent necessary to comply with Code Section 409A,
(a) the amount of any expenses eligible for reimbursement under this Agreement in any taxable year of the Executive shall not affect the expenses eligible for reimbursement in any other taxable year, and (b) the reimbursement of expenses
under this Agreement shall be made no later than on or before the last day of the Executive’s taxable year following the taxable year in which the expense was incurred, except to the extent earlier reimbursement is required under this Agreement
or Company policies and procedures. 
 3. Section 6(a) shall be amended by deleting the phrase “any compensation previously
deferred by the Executive (together with any accrued interest or earnings thereon) and” from the beginning of subsection (iii) of such section. 
 4. Section 6(c) shall be amended by deleting the phrase “the amount of any compensation previously deferred by the Executive and” from the first sentence of such section. 
 5. The following Section 12 shall be added at the end of the Agreement: 
 Compliance with Code Section 409A. It is the intent of the parties that the payment of all amounts under this Agreement
shall either qualify for exemption from or comply with the requirements of Code Section 409A, and any ambiguities herein will be 

 
interpreted to so comply. Notwithstanding anything in this Agreement to the contrary, if the Executive is a “specified employee” for purposes of
Code Section 409A at the time of a “termination of employment” (as determined in accordance with regulations issued pursuant to Code Section 409A), payments made by reason of such termination of employment shall, to the extent
such payments are considered to be “deferred compensation” (within the meaning of Treasury Regulation Section 1.409A-1(b)(1)), be made within ten (10) days after the end of the six-month period beginning on the date of the
Executive’s separation from service (as defined under Section 409A) or, if earlier, the appointment of the personal representative or executor of the Executive’s estate upon his death, to the extent the delay contemplated by the
foregoing is required to avoid a prohibited distribution under Code Section 409A(a)(2). To the extent that any amount of any payment that would otherwise be made upon termination of employment is delayed as provided in this Section 12,
(i) upon payment such amount shall include interest at the applicable federal rate as determined pursuant to Code Section 1274(d) from the date of such termination of employment through the date of payment; and (ii) if all or any
portion of such amount is not paid as provided in this Section 12 and the Executive brings suit or otherwise takes action to recover such amount or enforce the provisions of this Agreement, the Executive shall be reimbursed by the Company for
any reasonable attorneys’ fees incurred in connection with such suit or action. 
 IN WITNESS WHEREOF, the parties have
executed this Amendment as an instrument under seal, as of this 31 day of December, 2008. 
  

			
	 ABIOMED, Inc.

		
	By:	 	 /s/ Robert L. Bowen

		 	Vice President and Chief Financial Officer
	
	 Executive

	
	 /s/ Michael R. Minogue

	Michael R. Minogue

  

 -2-Amendend and Restated Compensation policy for Non-Employee Directors

 EXHIBIT 10.1 
 Mercury Computer Systems, Inc. 
 Compensation Policy for Non-Employee Directors 
 (Effective November 17, 2008) 
 Objective 

 It is the objective of Mercury to compensate non-employee directors in a manner which will enable recruitment and retention of highly
qualified directors and fairly compensate them for their services as a director. 
 Cash Compensation 
  

			
		
	 Annual retainer for non-employee directors:
	  	$55,000 per annum, paid quarterly
		
	 Additional annual retainers:
	  	
		
	 (a) Independent Chairman:
	  	$25,000 per annum, paid quarterly
		
	 (b) Chairman of the Audit Committee:
	  	$15,000 per annum, paid quarterly
		
	 (c) Chairman of the Compensation Committee:
	  	$12,000 per annum, paid quarterly
		
	 (d) Chairman of the N&G Committee:
	  	$6,000 per annum, paid quarterly

 Directors are entitled to be reimbursed for their reasonable expenses incurred in connection with
attendance at Board and committee meetings. 
 Quarterly retainer payments shall be paid in arrears within 30 days following the end of each
quarter, with the first payments under this policy to be made in January 2009 with respect to service during the quarter ended December 31, 2008. 
 Equity Compensation 
 New non-employee directors will be granted stock options to purchase 30,000 shares of common stock in
connection with their first election to the Board. These awards will vest as to 50% of the covered shares on each of the first two anniversaries of the date of grant, and will expire on the seventh anniversary of the date of grant. 
 Non-employee directors may also receive annual stock option awards at the discretion of the Compensation Committee. Beginning with fiscal year 2007,
non-employee directors will receive annual stock option awards covering 16,000 shares. These awards will vest as to 50% of the covered shares on the date of grant and as to the remaining covered shares on the first anniversary of the date of grant,
and will expire on the seventh anniversary of the date of grant. Non-employee directors will not be eligible to receive the annual stock option award for the fiscal year in which they are first elected. Non-employee directors who are first elected
to the Board during the first half of Company’s fiscal year will be eligible to receive the annual stock option award for the next fiscal year; otherwise, non-employee directors will not be eligible to receive their first annual stock option
award until the second fiscal year following the fiscal year in which they are first elected to the Board. 
 Approved by the Board of Directors, as amended,
on November 17, 2008First Amendment to Employment Agreement

 EXHIBIT 10.2 
 FIRST AMENDMENT 
 TO 
 EMPLOYMENT AGREEMENT 
 This First Amendment to Employment Agreement (“First
Amendment”) dated as of December 20, 2008 is made and entered into by and between Mercury Computer Systems, Inc., a Massachusetts corporation (the “Company”), and Mark Aslett (the “Executive”). 
 WHEREAS, the Company and the Executive are parties to an Employment Agreement dated as of November 19, 2007 (the “Employment Agreement”);
and 
 WHEREAS, the parties hereto desire to amend the Employment Agreement to comply with the requirement of Section 409A of the
Internal Revenue Code of 1986, as amended; and 
 WHEREAS, capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to them in the Employment Agreement. 
 NOW, THEREFORE, in consideration of the mutual covenants contained herein, the
Company and the Executive agree as follows: 
 1. Section 5(b)(i) of the Employment Agreement is amended by deleting the
second sentence thereof and substituting therefor the following: 
 “The Severance Amount shall be paid out on a salary
continuation basis in equal installments over a 12-month period beginning with the first payroll date that occurs 30 days after the Date of Termination.” 
 2. All other provisions of the Employment Agreement shall remain in full force and effect according to their respective terms, and nothing
contained herein shall be deemed a waiver of any right or abrogation of any obligation otherwise existing under the Employment Agreement except to the extent specifically provided for herein. 
 3. The validity, interpretation, construction and performance of this First Amendment shall be governed by the laws of the Commonwealth of
Massachusetts. 
 4. This First Amendment may be executed in several counterparts, each of which shall be deemed to be an
original but all of which together will constitute one and the same instrument. 
 IN WITNESS WHEREOF, the undersigned officer, on behalf of
Mercury Computer Systems, Inc., and the Executive have hereunto set their hands as an agreement under seal, all as of the date first above written. 
  

			
	MERCURY COMPUTER SYSTEMS, INC.
		
	 By:
	 	 /s/    ROBERT E.
HULT        

		 	 Robert E. Hult
 SENIOR VICE PRESIDENT AND
 CHIEF FINANCIAL OFFICER
 [PRINCIPAL FINANCIAL OFFICER]

	
	EXECUTIVE
		 	 /s/    MARK
ASLETT        

		 	Mark Aslett
		 	 PRESIDENT AND CHIEF EXECUTIVE OFFICER
 [PRINCIPAL EXECUTIVE OFFICER]Third Amendment to Employment Agreement

 EXHIBIT 10.3 
 THIRD AMENDMENT 
 TO 
 EMPLOYMENT AGREEMENT 
 This Third Amendment to Employment Agreement (“Third
Amendment”) dated as of December 22, 2008 is made and entered into by and between Mercury Computer Systems, Inc., a Massachusetts corporation (the “Company”), and Robert E. Hult (the “Executive”). 
 WHEREAS, the Company and the Executive are parties to an Employment Agreement dated March 8, 2007 and amended September 26, 2007 and
December 14, 2007 (the “Employment Agreement”); and 
 WHEREAS, the parties hereto desire to amend the Employment Agreement to
comply with the requirement of Section 409A of the Internal Revenue Code of 1986, as amended; and 
 WHEREAS, capitalized terms used
herein and not otherwise defined herein shall have the meanings ascribed to them in the Employment Agreement. 
 NOW, THEREFORE, in
consideration of the mutual covenants contained herein, the Company and the Executive agree as follows: 
 1.
Section 5(b)(i) of the Employment Agreement is amended by deleting said subsection and substituting therefor the following: 
 “(i) the Company shall continue to pay the Executive’s Base Salary for one year (the ‘Severance Amount’). The Severance Amount shall be paid out in substantially equal bi-weekly salary continuation installments over a
12-month period beginning with the first payroll date that occurs 30 days after the date of termination.” 
 2.
Section 5(c)(i) of the Employment Agreement is amended by deleting the second sentence thereof and substituting therefor the following: 
 “The Consulting Amount shall be paid out in substantially equal bi-weekly installments, beginning with the first payroll date that occurs 30 days after the date of termination.” 
 3. All other provisions of the Employment Agreement shall remain in full force and effect according to their respective terms, and nothing
contained herein shall be deemed a waiver of any right or abrogation of any obligation otherwise existing under the Employment Agreement except to the extent specifically provided for herein. 
 4. The validity, interpretation, construction and performance of this Third Amendment shall be governed by the laws of the Commonwealth of
Massachusetts. 
 5. This Third Amendment may be executed in several counterparts, each of which shall be deemed to be an
original but all of which together will constitute one and the same instrument. 

 IN WITNESS WHEREOF, the undersigned officer, on behalf of Mercury Computer Systems, Inc., and the
Executive have hereunto set their hands as an agreement under seal, all as of the date first above written. 
  

			
	MERCURY COMPUTER SYSTEMS, INC.
		
	By:	 	 /s/    MARK
ASLETT        

		 	 Mark Aslett
 PRESIDENT AND CHIEF EXECUTIVE OFFICER
 [PRINCIPAL EXECUTIVE
OFFICER]

	
	EXECUTIVE
		
	 	 	 /s/    ROBERT E.
HULT        

		 	 Robert E. Hult
 SENIOR VICE PRESIDENT AND
 CHIEF FINANCIAL OFFICER
 [PRINCIPAL FINANCIAL OFFICER]

  

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