Document:

1998 Employee Share Purchase Plan

 Exhibit 10.5A 
  
 AMENDMENT TO THE XOMA LTD. 
 1998 EMPLOYEE SHARE PURCHASE PLAN 
  
 The XOMA Ltd. 1998 Employee Share Purchase Plan, as amended (the “Plan”), is hereby amended, effective as of July 21, 2004, as follows: 
  

	 	1.	Section 5(a) of the Plan is amended to read as follows: 

  
 “(a) An eligible Employee may become a participant in the Plan by completing a subscription agreement authorizing payroll deductions
in a form prepared by the Company and filing it with the Company’s Human Resources Department at least one (1) day prior to the applicable Enrollment Date for a particular Offering Period, unless a different time for filing the subscription
agreement is set by the Committee for all eligible Employees with respect to a given Offering Period.” 
  

	 	2.	Section 6(c) of the Plan is amended to read as follows: 

  
 “(c) Once an Offering Period has commenced, a participant may decrease, but not increase, the rate of his or her payroll deductions
for that Offering Period once per calendar quarter by filing a new subscription agreement at least one (1) day prior to the beginning of the calendar quarter (or such other time set by the Committee for all eligible Employees with respect to a given
Offering Period), which decrease shall become effective at the beginning of the next calendar quarter; provided, however, that a participant may discontinue his or her participation in the Plan, as provided in Section 10 hereof, at any
time during the Offering Period prior to the Exercise Date. During an Offering Period, a participant may elect to have new or additional payroll deductions made with respect to the next beginning Offering Period, by completing or filing with the
Company an additional subscription agreement, at least one (1) day prior to the beginning of the next Offering Period (or such other time set by the Committee for all eligible Employees with respect to a given Offering Period), authorizing a payroll
deduction rate with respect to the new Offering Period. A participant’s subscription agreement shall remain in effect for other Offering Periods, but separate subscription agreements are required for each Offering Period.”Amendment to 1998 Employee Share Purchase Plan

 Exhibit 10.5B 
  
 AMENDMENT NO. 2 TO THE XOMA LTD. 
 1998 EMPLOYEE SHARE PURCHASE PLAN 
  
 The XOMA Ltd. 1998 Employee Share Purchase Plan, as amended (the “Plan”), is hereby amended, effective as of January 1, 2005, as follows: 
  

	 	1.	Section 2(h) of the Plan is amended to read as follows: 

  
 “(h) “Offering Periods” shall mean consecutive three (3) month periods commencing once every calendar quarter
beginning on the first Trading Day on or after January 1, April 1, July 1 and October 1 of each year, and ending on the last Trading Day prior to the end of such three (3) month period.” 
  

	 	2.	Section 2(i) of the Plan is amended to read as follows: 

  
 “(i) “Purchase Price” shall mean with respect to new Offering Periods under the Plan commencing on or after January 1,
2005, the Purchase Price for such Offering periods shall be an amount equal to 95% of the Fair Market Value of a Common Share on the Exercise Date for that Offering Period.”Employee Agreement dated March 26, 2004

 Exhibit 10.11 
  
 EMPLOYMENT AGREEMENT 
  
 This Employment Agreement (“Agreement”), made and effective this 26th day of March, 2004, by and between XOMA (US) LLC (“XOMA” or the “Company”), a Delaware limited liability company with its principal office
at 2910 Seventh Street, Berkeley, California, and Patrick J. Scannon, M.D., Ph.D., (“Executive”), an individual residing at 176 Edgewood, San Francisco, California. 
  
 WHEREAS, the Company wishes to enter into this Agreement to assure the Company of the continued services of Executive; and

  
 WHEREAS, Executive is willing to enter into this Agreement and
to continue to serve in the employ of the Company upon the terms and conditions hereinafter provided; 
  
 NOW, THEREFORE, in consideration of the mutual covenants herein contained, the parties hereto hereby agree as follows: 
  
 1. Employment. The Company agrees to continue to employ Executive,
and Executive agrees to continue to be employed by the Company, for the period referred to in Section 3 hereof and upon the other terms and conditions herein provided. 
  
 2. Position and Responsibilities. The Company agrees to employ Executive in the position of Senior Vice President and
Chief Scientific and Medical Officer, and Executive agrees to serve as Senior Vice President and Chief Scientific and Medical Officer, for the term and on the conditions hereinafter set forth. Executive agrees to perform such services not
inconsistent with his position as shall from time to time be assigned to him by the Chairman of the Board, President and Chief Executive Officer of the Company (the “Chairman”). 
  
 3. Term and Duties. 
  
 (a) Term of Employment. This Agreement shall become effective and the term of employment pursuant to this Agreement shall commence on March 26,
2004 and will continue until March 25, 2005, when it will terminate unless it is extended by mutual written consent of Executive and the Company or unless Executive’s employment is terminated by the Company or he resigns from the Company’s
employ as described herein. 
  
 (b) Duties. During the
period of his employment hereunder Executive shall serve the Company as its Senior Vice President and Chief Scientific and Medical Officer, and except for illnesses, vacation periods and reasonable leaves of absence, Executive shall devote all of
his business time, attention, skill and efforts to the faithful performance of his duties hereunder. 
  
 So long as Executive is Senior Vice President and Chief Scientific and Medical Officer of the Company, he will discharge all duties incidental to such
office and such further duties as may be reasonably assigned to him from time to time by the Chairman. 
  
 4. Compensation and Reimbursement of Expenses. 
  
 (a) Compensation. For all services rendered by Executive as Senior Vice President and Chief Scientific and Medical Officer during his employment
under this Agreement, the Company shall pay Executive as compensation a salary at a rate of not less than $340,000 per annum. All taxes and governmentally required withholding shall be deducted in conformity with applicable laws. 
  
 (b) Reimbursement of Expenses. The Company shall pay or reimburse
Executive for all reasonable travel and other expenses incurred by Executive in performing his obligations under this Agreement in a manner consistent with past Company practice. The Company further agrees to furnish Executive with such assistance
and accommodations as shall be suitable to the character of Executive’s position with the Company, adequate for the performance of his duties and consistent with past Company practice. 
  

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 5. Participation in Benefit Plans. The payments provided in Section 4 hereof are in addition to
benefits Executive is entitled to under any group hospitalization, health, dental care, disability insurance, surety bond, death benefit plan, travel and/or accident insurance, other allowance and/or executive compensation plan, including, without
limitation, any senior staff incentive plan, capital accumulation and termination pay programs, restricted or non-restricted share purchase plan, share option plan, retirement income or pension plan or other present or future group employee benefit
plan or program of the Company for which key executives are or shall become eligible, and Executive shall be eligible to receive during the period of his employment under this Agreement, and during any subsequent period(s) for which he shall be
entitled to receive payment from the Company under paragraph 6(b) below, all benefits and emoluments for which key executives are eligible under every such plan or program to the extent permissible under the general terms and provisions of such
plans or programs and in accordance with the provisions thereof. 
  
 6. Payments to Executive Upon Termination of Employment. 
  
 (a) Termination. Upon the occurrence of an event of termination (as hereinafter defined) during the period of Executive’s employment under this Agreement, the provisions of this paragraph 6(a) and
paragraph 6(b) shall apply. As used in this Agreement, an “event of termination” shall mean and include any one or more of the following: 
  
 (i) The termination by the Company of Executive’s employment hereunder for any reason other than pursuant to paragraph 6(c); or

  
 (ii) Executive’s resignation from the
Company’s employ, upon not less than thirty (30) days’ prior written notice. 
  
 (b) Continuation of Salary and Other Benefits. Upon the occurrence of an event of termination under paragraph 6(a), the Company (i) shall, subject to the provisions of Section 7 below, pay Executive, or in the
event of his subsequent death, his beneficiary or beneficiaries of his estate, as the case may be, as severance pay or liquidated damages, or both, semi-monthly for a period of twelve (12) months following the event of termination (the
“Severance Payment Period”), a sum equal to his current salary in effect at the time of the event of termination, but in no case less than $340,000 per annum, (ii) shall continue to provide the other benefits referred to in Section 5
hereof until the end of the Severance Payment Period or until Executive becomes employed elsewhere, whichever is earlier, and (iii) shall continue to provide the benefits provided for in paragraph 4(c) to the extent of expenses incurred but not
reimbursed prior to the event of termination. Such payments shall commence on the last day of the next regular pay period following the date of the event of termination, or, at the election of the Company, may be paid in one lump sum or in such
other installments as may be mutually agreed between the Company and Executive or, in the event of his subsequent death, his beneficiary or beneficiaries or legal representative, as the case may be. 
  
 (c) Other Termination of Employment. Notwithstanding paragraphs 6(a)
and (b) or any other provision of this Agreement to the contrary, if on or after the date of this Agreement and prior to the end of the term hereof: 
  
 (i) Executive has been convicted of any crime or offense constituting a felony under applicable law, including, without limitation, any
act of dishonesty such as embezzlement, theft or larceny; 
  
 (ii) Executive shall act or refrain from acting in respect of any of the duties and responsibilities which have been assigned to him in accordance with this Agreement and shall fail to desist from such action or
inaction within ten (10) days (or such longer period of time, not exceeding ninety (90) days, as Executive shall in good faith and the exercise of reasonable efforts require to desist from such action or inaction) after Executive’s receipt of
notice from the Company 
  

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 of such action or inaction and the Board of Directors determines that such action or inaction constituted
gross negligence or a willful act of malfeasance or misfeasance of Executive in respect of such duties; or 
  
 (iii) Executive shall breach any material term of this Agreement and shall fail to correct such breach within ten (10) days (or such
longer period of time, not exceeding ninety (90) days, as Executive shall in good faith and the exercise of reasonable efforts require to cure such breach) after Executive’s receipt of notice from the Company of such breach; 
  
 then, and in each such case, the Company shall have the right to give notice of termination
of Employee’s services hereunder as of a date (not earlier than fourteen (14) days from such notice) to be specified in such notice and this Agreement (other than the provisions of Section 7 hereof) shall terminate on such date. 
  
 7. Post-Termination Obligations. All payments and benefits to
Executive under this Agreement shall be subject to Executive’s compliance with the following provisions during the term of his employment and for the Severance Payment Period: 
  
 (a) Confidential Information and Competitive Conduct. Executive shall not, to the detriment of the Company, disclose
or reveal to any unauthorized person any trade secret or other confidential information relating to the Company or its affiliates or to any businesses operated by them, and Executive confirms that such information constitutes the exclusive property
of the Company. Executive shall not otherwise act or conduct himself to the material detriment of the Company or its affiliates, or in a manner which is inimical or contrary to the interests thereof, and shall not, directly or indirectly, engage in,
enter the employ of or render any service to any person, firm or business in direct competition with any part of the business being conducted by the Company; provided, however, that Executive’s ownership less than five percent (5%) of
the outstanding stock of a corporation shall not be itself be deemed to constitute such competition. Executive recognizes that the possible restrictions on his activities which may occur as a result of his performance of his obligations under this
paragraph 7(a) are required for the reasonable protection of the Company and its investments. For purposes hereof, “direct competition” means the pursuit of one or more of the same therapeutic or diagnostic indications utilizing a
substantially similar scientific basis. 
  
 (b) Failure of
Executive to Comply. If, for any reason other than death or disability, Executive shall, without written consent of the Company, fail to comply with the provisions of paragraph 7(a) above, his rights to any future payments or other benefits
hereunder shall terminate, and the Company’s obligations to make such payments and provide such benefits shall cease. 
  
 (c) Remedies. Executive agrees that monetary damages would not be adequate compensation for any loss incurred by the Company by reason of a breach
of the provisions of this Section 7 and hereby agrees to waive the defense in any action for specific performance that a remedy at law would be adequate. 
  
 8. Effect of Prior Agreements. This Agreement contains the entire understanding between the parties hereto and supersedes any prior employment
agreements between the Company and Executive. 
  
 9. General
Provisions. 
  
 (a) Binding Agreement. This Agreement
shall be binding upon, and inure to the benefit of, Executive and the Company and their respective permitted successors and assigns. 
  
 (b) Legal Expenses. In the event that Executive incurs legal expenses in contesting any provision of this Agreement and such contest results in a
determination that the Company has breached any of its obligations hereunder, Executive shall be reimbursed by the Company for such legal expenses. 
  
 10. Successors and Assigns.  
  
 (a) Assignment by the Company. This Agreement shall be binding upon and inure to the benefit of the successors and assigns of the Company and,
unless clearly inapplicable, reference herein to the Company shall be deemed to include its successors and assigns. 
  

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 (b) Assignment by Executive. Executive may not assign this Agreement in whole or in part.

  
 11. Modification and Waiver.  
  
 (a) Amendment of Agreement. This Agreement may not be modified or
amended except by an instrument in writing signed by the parties hereto. 
  
 (b) Waiver. No term or condition of this Agreement shall be deemed to have been waived except by written instrument of the party charged with such waiver. No such written waiver shall be deemed a continuing
waiver unless specifically stated therein, and each such waiver shall operate only as to the specific term or condition waived. 
  
 12. Severability. In the event any provision of this Agreement or any part hereof is held invalid, such invalidity shall not affect any remaining
part of such provision or any other provision. If any court construes any provision of this Agreement to be illegal, void or unenforceable because of the duration or the area or matter covered thereby, such court shall reduce the duration, area or
matter of such provision, and, in its reduced form, such provision shall then be enforceable and shall be enforced. 
  
 13. Governing Law. This Agreement has been executed and delivered in the State of California, and its validity interpretation, performance, and
enforcement shall be governed by the laws of said State. 
  
 IN
WITNESS WHEREOF, XOMA has caused this Agreement to be executed by its duly authorized officer, and Executive has signed this Agreement, all as of the day and year first above written. 
  

	
	 XOMA (US) LLC

	
	 /s/ JOHN L. CASTELLO

	 John L. Castello

	 Chairman of the Board, President

	 and Chief Executive Officer

	
	 /s/ PATRICK J. SCANNON, M.D., PH.D.

	 Patrick J. Scannon, M.D., Ph.D.

  

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