Document:

Addendum to Employment Agreement

 Exhibit 10.20 
 ADDENDUM TO EMPLOYMENT AGREEMENT 
 THE UNDERSIGNED: 

The limited liability company CERUS EUROPE B.V, having its corporate seat in Leusden, The Netherlands, with office address at
Stationsstraat 79-d, 3811 MH Amersfoort, the Netherlands, duly represented by its Managing Director, Mr. C.J.R. Glassell (‘Cerus Europe’); 
 AND 
 Mr. C.J. HOGEBOOM, residing at [Home Address Omitted] (‘Mr.
Hogeboom’); 
 Cerus Europe and Mr. Hogeboom may be referred to hereinafter individually as a ‘Party’ and jointly
as the ‘Parties’; 
 WHEREAS: 
  

	a.	Mr. Hogeboom entered into the service of Cerus Europe on March 8, 2006 and lastly fulfilled the position of Managing Director; 

 

	b.	Mr. Hogeboom has been appointed as managing director under the articles of association of Cerus Europe (“statutair bestuurder”) on
23 March 2006; 

  

	c.	Mr. Hogeboom resigned per 17 February 2011 from his statutory position as Managing Director of Cerus Europe. Cerus Corporation, as sole shareholder of Cerus
Europe, accepted the resignation of Mr. Hogeboom and granted him an honourable discharge as managing director of Cerus Europe per the resignation date; 

 

	d.	Parties agree to preserve all rights contained in Mr. Hogeboom’s existing employment arrangement. Parties subsequently will continue the employment agreement
under the same conditions of employment (as included in the employment contract dated March 6, 2006, and the amendments as inserted in the letter of December 11, 2009, attached to this Addendum as Annex 1), but with the sole
exception of Mr. Hogeboom’s position, which will be called “Titular Director” (in Dutch: “Algemeen Directeur”). 

  
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 HAVE AGREED AS FOLLOWS: 
  

	1	The employment relationship between parties will continue after 17 February 2011 and Mr. Hogeboom will fulfil the position of “Titular Director” (in
Dutch: “Algemeen Directeur”). Within the group Cerus Europe belongs to, this position may also be named: “General Manager”. 

  

	2	The employment conditions as included in the employment contract dated March 6, 2006, and the amendments as inserted in the letter of December 11, 2009, will
remain in full force with the sole exception of Mr. Hogeboom’s position. 

  

	3	During the employment agreement between parties and for a period of 12 months after the termination of the employment, Mr. Hogeboom shall not, without prior
written permission from Cerus Europe, undertake and/or be engaged in any activities that in any way or any form whatsoever within the Netherlands, whether in his own name, or by means of and/or in collaboration with or in the employ or other natural
or legal persons which are the same as or similar to the activities of Cerus Europe or the enterprises affiliated with Cerus Europe. This includes acquiring or owning shares or depository receipts for shares, whether or not in his own name, in
enterprises affiliated with Cerus Europe, excluding shares officially listed on a stock exchange not to exceed 1% of the issued shares of such enterprises. 

 During the employment agreement, including any notice periods and for a period of twelve (12) months after the termination thereof, Mr. Hogeboom shall refrain, without Cerus Europe’s prior
written consent, from soliciting the employment of or employ any of Cerus Europe staff and shall refrain any form of business contact with customers and other business relations of Cerus Europe or enterprises affiliated with Cerus Europe, even if
the initiative for this business contact comes from these customers and relations. 
 Mr. Hogeboom shall however be free to
develop any business during the twelve (12) months after termination as long as the business does not compete with and is not in a similar field of any of the business that Cerus Europe and/or enterprise affiliated to Cerus Europe conducts.

 This non-competition clause will apply to the following companies: Caridian BCT, Maco- Pharma, Octopharma and Grifols.

 In consideration for the non-competition and non-solicitation obligations under this Clause (Clause 3), Cerus Europe will pay
Mr. Hogeboom twelve (12) months of gross salary; provided that, if Cerus Europe determines at its discretion to shorten the period of the noncompetition and non-solicitation obligations, then Cerus Europe shall only be required to pay
Mr. Hogeboom one month’s gross salary per month of such restriction. 
  

	3	To the extent permitted by law, Parties waive the rights under Articles 6;265 to 6:272 inclusive of the Dutch Civil Code to rescind (ontbinden), or demand in
legal 

  

					
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	5	This Agreement constitutes a settlement agreement (vaststellingsovereenkomst) in accordance with article 7:900 Civil Code (BW). 

 

	6	This Addendum is governed by Dutch law. Any dispute in connection with this Addendum shall finaly be settled before the competent court of Amsterdam, the Netherlands.

 Drawn up in two originals and signed on 17 February 2011, each Party acknowledging having received one signed copy of this
Addendum. 
  

					
	For Cerus Europe B.V.	 		 	
			
	 /s/ Mr. C.J.R. Glassell
	 		 	 /s/ Mr. Hogeboom

	Mr. C.J.R. Glassell	 		 	Mr. Hogeboom

  
 3/3Healthcare Contribution Letter

 Exhibit 10.21 
 [CERUS LETTERHEAD] 
 December 18, 2007 

De heer C. Hogeboom 
 [Home Address Omitted]

 Ref: 2007-12-18.001 ST, Side letter contract 
 Dear Caspar, 
 In line with the agreements made at the time of your arrival at Cerus, I hereby
confirm that Cerus will pay for the premiums for the healthcare insurance for yourself, your wife and children and/or the actual paid amount to the health insurance company. 
 I trust that this letter confirms the agreements earlier made. 
 If you have any additional
questions, please don’t hesitate to contact me. 
 Kind regards, 

 

	
	 /s/ Obi Greenman

	Obi Greenman
	President Cerus Europe B.V.Home Telephone and Internet Expenses Letter

 Exhibit 10.22 
 [CERUS LETTERHEAD] 
 Mr. C.J. Hogeboom 

[Home Address Omitted] 

Amersfoort, 11th January 2012 
 Dear Caspar, 
 This letter is to formalize that Cerus Europe B.V. agreed to
pay your home telephone and internet expenses upon your commencement date of employment, being 8th March 2006. 
 Kind regards, 
 Cerus Europe B.V. 
  

	
	 /s/ William Greenman

	William “Obi” Greenman
	Director2011 and 2012 Executive Officer Compensation Arrangements

 Exhibit 10.36 
 2011 and 2012 Executive Officer Compensation Arrangements 
 The
compensation for the executive officers of Cerus Corporation regarding annual base salaries and target bonus percentages were as follows: 
  

																	
	 Name
	  	2011
Annual Base
Salary (1)	 	  	2011
Targeted Bonus
(as a % of 2011
Annual Base
Salary)	 	 	2012
Annual Base
Salary (2)	 	  	2012
Targeted Bonus
(as a % of 2012
Annual Base
Salary)	 
	 Claes Glassell(3)
 Former President and Chief Executive Officer
	  	$	500,000	  	  	 	60	% 	 	 	—  	  	  	 	—  	  
					
	 William M. Greenman(4)
 President and Chief Executive Officer
	  	$	415,000	  	  	 	60	% 	 	$	475,000	  	  	 	60	% 
					
	 Laurence M. Corash, M.D.

Senior Vice President, Chief Scientific Officer
	  	$	378,755	  	  	 	35	% 	 	$	390,113	  	  	 	35	% 
					
	 Howard G. Ervin

Vice President, Legal Affairs and Chief Legal Officer
	  	$	317,761	  	  	 	35	% 	 	$	327,295	  	  	 	35	% 
					
	 Kevin D. Green

Vice President, Finance and Chief Accounting Officer
	  	$	242,000	  	  	 	35	% 	 	$	263,780	  	  	 	35	% 
					
	 Caspar Hogeboom(5)
 President, Cerus Europe B.V. (6)
	  	$	286,834	  	  	 	35	% 	 	$	290,936	  	  	 	35	% 

  

	(1)	Annual base salary was effective March 1, 2011, except for Mr. Greenman, as discussed in footnote 4 below. 

	(2)	Annual base salary was effective March 1, 2012. 

	(3)	Mr. Glassell resigned as President and Chief Executive Officer effective April 18, 2011. 

	(4)	Mr. Greenman became President and Chief Executive Officer effective April 18, 2011. Prior to his role as President and Chief Executive Officer,
Mr. Greenman served as the Company’s Senior Vice President, Business Development & Marketing and Chief Business Officer, with an annual base salary of $321,360 and a target bonus percentage of 35%, effective March 1, 2011.

	(5)	Mr. Hogeboom’s annual base salary has been converted from Euros to United States dollar. Mr. Hogeboom’s 2011 annual base salary of €206,000 has
been converted from Euros to United States dollar by applying an average exchange rate of €1 to $1.3924 for the year ended December 31, 2011. Mr. Hogeboom’s 2012 annual base salary of €224,540 has been converted from Euros
to United States dollar using the exchange rate of €1 to $1.2957, which was the exchange rate in effect on December 31, 2011. 

	(6)	Mr. Hogeboom’s title changed from General Manager, Cerus Europe to President, Cerus Europe B.V., effective March 1, 2012.Non-Employee Director Compensation Policy

 Exhibit 10.37 
 Cerus Corporation 
 Amended and Restated Non-Employee Director
Compensation Policy 
 Effective: January 1, 2012 

Each member of the Board of Directors (the “Board”) who is not also serving as an employee of Cerus Corporation
(“Cerus”) or any of its affiliates (each such member, a “Director”) will receive the following compensation for his or her Board service: 
 Annual Cash Compensation 
 The annual cash compensation amount set forth
below is payable in equal quarterly installments, payable in advance during the first 30 days of each quarter in which the service will occur. If a Director joins the Board at a time other than effective as of the first day of the calendar year,
each element of the annual cash compensation set forth below will be pro-rated based on days served in the applicable calendar year, with the pro-rated amount paid for the first quarter in which the Director provides the service (payable not later
than 30 days after the Director commences such service), and regular full quarterly payments thereafter The annual cash compensation is vested upon payment 
 1. Annual Cash Retainer: 
  

	 	a.	Chairman of the Board: $57,500 

  

	 	b.	All other Directors: $35,000 

2. Committee Chair Service Fee: 
  

	 	a.	Chairman of the Audit Committee: $26,000 

  

	 	b.	Chairman of the Compensation Committee: $12,500 

  

	 	c.	Chairman of the Nominating and Corporate Governance Committee: $10,000 

 3. Committee Member (non-Chair) Service Fee: 
  

	 	a.	Audit Committee: $13,000 

  

	 	b.	Compensation Committee: $8,000 

  

	 	c.	Nominating and Corporate Governance Committee: $6,000 

 Equity Compensation 
 The equity compensation set forth below will be
granted under the Cerus Corporation 2008 Equity Incentive Plan (the “Plan”). All stock options granted under this policy will be non-statutory stock options, with an exercise price per share equal to 100% of the “Fair Market
Value” (as defined in the Plan) of the underlying Cerus common stock on the date of grant, and a term of not more than ten (10) years from the date of grant. All stock options granted under this

  
 1. 

 
policy will be made automatically in accordance with the terms of this policy and the Plan, without the need for any additional corporate action by the Board or the Compensation Committee of the
Board. All equity awards granted under this Policy will become fully vested as of immediately prior to a “Change in Control” (as defined in the Plan), subject to the Director’s “Continuous Service” (as defined in the Plan)
as of such time. 
 1. Initial Grant: On the date of the Director’s initial election to the Board (or, if such date
is not a market trading day, the first market trading day thereafter), the Director will be granted a stock option for 25,000 shares of Cerus common stock, with such option vesting in forty-eight (48) equal monthly installments, such that the
option is fully vested on the fourth anniversary of the date of grant, subject to the Director’s Continuous Service. 
 2.
Annual Grant: On the first market trading day of each calendar year, each Director will be granted a stock option for the number of shares of Cerus common stock set forth below, with such option vesting in twelve (12) equal monthly
installments on the last day of each month (with the first such vesting date being the last day of the month in which such option was granted) such that the option is fully vested on December 31 of the year in which such option was granted,
subject to the Director’s Continuous Service: 
  

	 	a.	Chairman of the Board: 32,500 shares* 

  

	 	b.	All other Directors: 25,000 shares* 

  

	*	In the case of the first annual grant to a Director, this number of shares will be pro-rated based on the number of days served as a Director in his or her first
calendar year of service as a Director. For example, if an individual commenced service as a Director on July 1, 2012, he will receive an annual grant on January 2, 2013 covering 12,500 shares – i.e., 50% of the 25,000 annual grant.

  
 2.

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