Document:

Amended and Restated Certificate of Incorporation

 Exhibit 10.21 
 CERTIFICATE OF AMENDMENT OF 
 RESTATED 
 CERTIFICATE OF INCORPORATION 
 OF 
 EXPONENT, INC. 
 The undersigned,
Michael R. Gaulke, hereby certifies that: 
 1. He is the duly elected and acting President and Chief Executive Officer of Exponent, Inc., a
Delaware corporation. 
 2. Pursuant to Section 242 of the General Corporation Law of the State of Delaware, this Certificate of
Amendment amends paragraph (A) of Article Fourth of this Corporation’s Restated Certificate of Incorporation to read in its entirety as follows: 
 “(A) This Corporation is authorized to issue two classes of stock, preferred stock and common stock. The authorized number of shares of capital stock is One Hundred and Five Million (105,000,000) shares, of
which the authorized number of shares of preferred stock is Five Million (5,000,000) and the authorized number of shares of common stock is One Hundred Million (100,000,000). The stock, whether preferred stock or common stock, shall have a par
value of one-tenth of one cent ($0.001) per share. Each share of common stock of this Corporation outstanding, and each share of common stock held in this Corporation’s treasure, at the close of business on the effective date of this amendment
shall be reclassified, converted and changed into two (2) fully paid and nonassessable shares of common stock, $0.001 par value, of this Corporation.” 
 3. The foregoing Certificate of Amendment has been duly adopted by this corporation’s Board of Directors and stockholders in accordance with the provisions the Corporation’s Restated Certificate of
Incorporation and with the General Corporation Law of the State of Delaware by the directors and stockholders of the Corporation. 
 This
Certificate of Amendment is executed at Menlo Park, California, May 24, 2006. 
  

	
	 /s/ Michael R. Gaulke

	Michael R. Gaulke
	President and Chief Executive OfficerEmployment offer letter between Exponent, Inc. and Dr. Elizabeth Anderson

 Exhibit 10.22 
 [On Exponent letterhead] 
 May 9, 2006 
 Elizabeth L. Anderson, Ph.D. 
 Dear Betty: 
 On behalf of Exponent, I am pleased to offer you the full-time position of Group Vice President and Principal
Scientist in the Firm’s Health Group. In this role, you will have responsibility for the Health Group currently comprising the Health Sciences and the Food & Chemicals Practices. You will work out of our Alexandria, Virginia, Office.

 You will be providing leadership to 105 consultants and have profit and loss responsibility for a business that generated $25 million in revenues in 2005.
This business sector has tremendous strategic importance for the future of Exponent, has grown steadily in recent years and has substantial opportunities for continued growth. Exponent is committed to be the premier health sciences consulting firm
in the world. We believe with the addition of your leadership and national reputation as an expert scientist in this arena, we can achieve this goal. 
 As
the Group Vice President for the Health Group you will be a senior Officer of the Firm and a part of Exponent’s senior management team. You will be a member of the Firm’s Operating Committee responsible for setting operating policy for the
Firm and monitoring our performance. Additionally, you will have a seat on the Development Committee responsible for setting strategic growth objectives and identifying opportunities for new business initiatives. 
 We understand that during the next five years it is your intention to work full time for Exponent. We realize that certain current professional commitments require some
of your time and believe it will be beneficial for both you and Exponent that you continue these activities. For example, we support your continuing as Editor of Risk Analysis. 
 You will receive an annualized base salary of $425,000, paid in bi-weekly increments of $16,346.16. You will be eligible for annual salary increases based on performance. 
 You will be eligible to participate in the Firm’s annual bonus program. Exponent’s bonus pool is funded with one third of the pre-tax, pre-bonus profits of the
Firm. Individual bonuses are based on individual performance and the performance of the Firm. We expect your annual bonus awards could vary between $0 and $250,000 or more based on 

 Elizabeth L. Anderson, Ph.D. 
 May 9, 2006 
 Page 2 
  

 
performance to be determined primarily on the following factors: personal revenue, business generated, and profits and growth of the Health Group. Specific
bonus targets can be developed separately if you believe doing so would be beneficial. Bonus payments are made in March of the following year and are contingent upon your being an active, full-time employee of the Firm at the time of payment. For
2006 you will receive a cash bonus of $250,000 payable at the end of December 2006. 
 For 2007 and beyond, you will also be eligible to participate in the
Firm’s Equity Compensation Program, the 30/30 Plan. Under the 30/30 Plan, the Officers of the Firm have 30% of their bonus issued in restricted stock units, which will be matched by an equivalent grant of restricted stock units. For example,
under the provisions of the Equity Compensation Program, if you receive a $150,000 bonus, you will receive $105,000 in cash and $45,000 in restricted stock units (Bonus Units). In addition, you will also be awarded a further $45,000 of restricted
stock units (Matching Units). The restricted stock units represent shares of Exponent common stock to be delivered four years from the date of grant. Please refer to the enclosed Exponent Equity Compensation Program Summary for further information
regarding the features and terms of the program. 
 In addition, Exponent will make a discretionary company contribution of $1,000,000 under the Firm’s
Deferred Compensation Plan. One eighth of this amount will vest on each three-month anniversary of your date of hire, provided that you remain a full-time employee. 
 Payments to you from the Deferred Compensation Plan will be set to be: (1) $500,000 on July 1, 2007; and (2) the remainder on July 1, 2008 subject to the 162(m) provision. Under the 162(m)
provision, if the payment would result in your 2008 income from Exponent exceeding $1,000,000, then the amount paid to you from the Deferred Compensation Plan would be such that your Exponent income for 2008 would be equal to $1,000,000 and the
balance would carry over to the next year. The carryovers would continue from year to year until the entire discretionary company contribution plus earnings is paid out. For the consideration above, you agree that for five years from your first day
of employment at Exponent that you will not compete directly or indirectly in any manner with the business of Exponent. 
 You will receive an excellent
benefits package, including company-subsidized medical, dental, vision, and life insurance, four weeks’ paid vacation, a deferred compensation 
 program (information enclosed), and a 401(k) Retirement Program. These benefits will become effective on your first day of employment. In addition, the Firm will make an annual contribution to your 401(k) Retirement Program equivalent to 7%
of your total eligible annual earnings regardless of your participation; this contribution is subject to the IRS annual eligible compensation limit of $220,000 for 2006. The Firm’s contribution is subject to a requirement of 1,000 hours worked
during each plan year. 

 Elizabeth L. Anderson, Ph.D. 
 May 9, 2006 
 Page 3 
  

 At any time after four years of full-time employment with Exponent, you will be eligible to move to hourly status
with compensation set at 75% of your personal revenue. This percentage is based on the assumption that your support work would continue to be performed at Exponent. 
 This offer anticipates that you will join the Firm sometime on or before the Officers’ annual retreat with our Board of Directors on May 24, 2006. We are excited about the opportunity to add your
capabilities and welcome you to the Exponent team. 
  

					
	Sincerely,	 		 	I accept the terms of this offer letter:
			
	 /s/ Paul R. Johnston
	 		 	 /s/ Elizabeth L. Anderson

	 Paul R. Johnston, Ph.D., P.E.
 Chief Operating
Officer
	 		 	Signature
			
		 		 	 Elizabeth L. Anderson

		 		 	Print Name
			
	Enclosures	 		 	May 15, 2006
		 		 	Acceptance DateFifth amendment to lease of premises

 EXHIBIT 10.58 
 FIFTH AMENDMENT TO OFFICE LEASE 
 THIS FIFTH AMENDMENT TO OFFICE LEASE (the “Fifth
Amendment”) is dated as of June 1, 2006 (the “Effective Date”) and is entered into by and between 7th Street Property General Partnership (“Landlord”) and XOMA Ltd. and XOMA (US) LLC, a Delaware limited liability
company (collectively, “Tenant”), with reference to the following facts: 
 A. Landlord and Tenant entered into that certain Lease
dated as March 25, 1992 with respect to the Premises described therein comprised of 21,425 rentable square feet located on the first floor (“First Floor”) of the Building known as 2910 Seventh Street, Berkeley, Ca. 
 B. The lease as amended by (i) that certain Amendment to Office Lease dated as of December 31, 1997, (ii) that certain Second Amendment to
Office Lease dated April 10, 2000, (iii) that certain Amendment to Office Lease Agreement dated April 16, 2001, and (iv) that certain letter amendment dated March 15, 2005 is hereinafter referred to as the “Lease”.

 C. The term of the Lease is fixed to expire as of September 30, 2007. 
 D. Landlord and Tenant desire to amend the Lease to provide, among other provisions, for the incorporation of 22,334 rentable square feet located on the
second floor of the Building into the Premises (the “Second Floor Premises”), for the extension of the Term, for the modification of the Base Rent and for the modification of certain other terms in the Lease, all as more particularly set
forth below. 
 NOW, THEREFORE, in consideration of the mutual covenants set forth herein and other good and valuable consideration, the
receipt whereof and sufficiency of which is hereby acknowledged, the parties hereto agree as follows: 
 1. Scope of Fifth Amendment and
Defined Terms. Except as expressly provided in this Fifth Amendment, the Lease shall remain in full force and effect. Except as expressly provided in this Fifth Amendment, the term “Lease” shall mean the Lease as modified by this Fifth
Amendment. Capitalized terms used in this Fifth Amendment and not otherwise defined herein shall have the respective meanings set forth in the Lease. 
 2. Modifications to Lease. Notwithstanding anything in the Lease to the contrary, the Lease is hereby modified as follows: 
 (a) Second Floor Premises. The Second Floor Premises as more particularly described on Exhibit A which is attached hereto, are
hereby incorporated into the Premises. All of the terms and conditions of the Lease shall be applicable to the Second Floor Premises, except as specifically set forth in this Fifth Amendment. Landlord and Tenant have agreed upon the rentable square
feet of the Second Floor Premises and of the Building for all purposes of this Lease. 
  

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 (b) Second Floor Premises Commencement Date. The Second Floor Premises
Commencement Date shall be the Effective Date. 
 (c) Extension of Term. The Termination Date shall be May 31,
2014 . 
 (d) Premises Rentable Area: From and after the Effective Date, the rentable square feet of the Premises shall
be 43,759. 
 (e) First Floor Base Rent. From and after the Effective Date, Base Rent for the First Floor shall be paid
as follows: 
  

				
	 Months
	  	Monthly
Base Rent
	1-24	  	$	61,489.75
	25-36	  	$	63,334.45
	37-48	  	$	65,234.48
	49-60	  	$	67,191.51
	61-72	  	$	69,207.25
	73-84	  	$	71,283.47
	85-96	  	$	73,421.98

 (f) First Floor Operating Expense Credit and Utility Credit: 
 (i) Operating Expenses Credit: $113,380.00 per year based on a 1992 Base Year. 
 (ii) Utility Credit: $0.13 per rentable square foot per month 
 (g) Second Floor Base Rent. From and after the Effective Date, Base Rent for the Second Floor shall be paid as follows: 

 

				
	 Months
	  	Monthly
Base Rent
	 1-24
	  	$	27,917.50
	 25-36
	  	$	28,755.03
	 37-48
	  	$	29,617.68
	 49-60
	  	$	30,506.21
	 61-72
	  	$	31,421.39
	 73-84
	  	$	32,364.03
	 85-96
	  	$	33,334.95

 (h) Second Floor Operating Expense Credit: $0.035 per rentable square foot
per month. 
  

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 (g) Allowance; Condition of Premises. 
 (i) Landlord will provide a tenant improvement allowance in the amount of $150,000 (“Allowance”) with respect to the Second
Floor Premises. All repairs and alterations to the Premises, including the Second Floor Premises shall be performed in accordance with Article 7 of the Lease (“Tenant Improvements”). Tenant shall submit plans and specifications
(“Plans and Specifications”) for the Tenant Improvements for Landlord’s review and approval, which approval shall not be unreasonably withheld. Landlord shall have the right to approve Tenant’s contractor and subcontractors
(collectively, “Contractors”), which approval shall not be unreasonably withheld. Landlord shall have five (5) business days to approve the Plans and Specifications and Contractors and the failure to issue a disapproval within this
time period shall be deemed an approval of the submitted items. 
 (ii) Tenant will accept the Premises, including the Second
Floor Premises as of the Second Floor Commencement Date in its “as-is” condition, with no additional obligation on the part of Landlord to repair, remodel or refurbish the Premises, including the Second Floor Premises. 
 (iii) The Allowance shall be disbursed by Landlord after the completion of all tenant improvements within thirty (30) days after
delivery by Tenant to Landlord of (i) invoices marked paid and other evidence as Landlord shall reasonably require of the cost of the design of the tenant improvements and the cost of the tenant improvements; (ii) evidence reasonably
satisfactory to Landlord that all of the Tenant Improvements constructed to date have been satisfactorily completed in accordance with the plans and specifications approved by Landlord, upon certifications reasonably satisfactory to Landlord
delivered by Tenant and Tenant’s architect; (iii) unconditional final lien releases from the general contractor and each subcontractor; (iv) a cost breakdown of Tenant’s final and total construction costs incurred in connection
with the Tenant Improvements, together with receipted invoices showing evidence of full payment therefor; (v) copies of permits required in connection with the Tenant Improvements and all governmental approvals, sign offs and certificates of
occupancy with respect to the Tenant Improvements, and (vi) the Lease shall be in full force and effect and there shall exist no event of default under the Lease. 
 (h) Option to Extend Term. The following section is incorporated into the Lease: 
 (i) Tenant is hereby granted an option to extend the term of the Lease (the “Option Term”) from the Termination Date to
May 31, 2019 (the “Extended Termination Date”) by giving written notice to Landlord of Tenant’s intent to exercise such option (the “Option Notice”) no later than May 31, 2013. The Option Term shall be on the same
terms and conditions in effect immediately before the commencement of the Option Term, except that the rent shall be set at 95% of the Fair Market Lease Rate (as hereinafter defined) for comparable space in the Berkeley area; provided that in no
event shall the rental rate for the Option Term be less than the rental rate as of the last day immediately before the commencement of the Option Term. Notwithstanding anything to the contrary above, if Tenant is in default in the payment of rent,
in the making of other payments required to be made by Tenant under this Lease, or otherwise under this Lease on the date the Option Notice is delivered to Landlord or on the date the Option Term is to commence, the Option Term shall not commence
and this Lease shall expire as of the Termination Date. 
  

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 (ii) Fair Market Lease Rate. Landlord shall give Tenant notice
(“Landlord’s Notice”) of the fair market lease rate (including fair market increases during the Option Term) after receiving Tenant’s written notice of intent to exercise the Option, provided that Landlord’s Notice shall not be delivered later than 120 days prior to the commencement of the Option Term. If Tenant believes that the fair market lease rate as
established by Landlord is incorrect, Tenant shall notify Landlord in writing within 20 days of Tenant’s
receipt of the notice from Landlord that Tenant desires to submit the matter to appraisal with a designation of a commercial real estate broker with at least three years experience in the office leasing market in Berkeley and Emeryville. If Landlord
agrees with the identity of such appraiser, it shall within 10 days notify the appraiser and Tenant that such appraiser shall determine the fair market lease rate (including fair market increases during the Option Term). If not, Landlord shall
submit the name of its appraiser with the same qualifications set forth above to Tenant within said 10 days. The two appraisers so selected shall choose a third appraiser with the same qualifications set forth above and the three together shall
determine the fair market lease rate (including fair market increases during the Option Term). If the two appraisers cannot select a third appraiser within 20 days after Landlord submits the name of its appraiser, either party may at any time apply
to the presiding judge of any court of competent jurisdiction for the appointment of the third appraiser. If the three appraisers are unable to agree on the fair market lease rate they shall each determine the fair market lease rate assuming annual
CPI increases during the Option Term and then average their determinations by tossing out the high and low appraisal and accepting the middle appraisal as the fair market lease rate. The costs of the appraisal process shall be borne by Tenant unless
the fair market lease rate as determined by the appraisal is more than 10% below the lease rate set forth in Landlord’s Notice in which case Landlord and Tenant shall share the reasonable costs of the appraisal process equally. The appraisal
process shall be completed as quickly as reasonably possible. If for any reason the Option Term commences prior to the conclusion of the appraisal process, Tenant shall continue to pay the monthly base rent then in effect to Landlord plus 5% of such
amount, pending completion of the appraisal process, at which time all surplus funds, if any, shall be distributed to Tenant in accordance with the outcome of the appraisal process, and Tenant shall subsequently be bound by the lease rate as
determined by the appraisal process. The rent during the Option Term shall continue to be adjusted as agreed upon between Landlord and Tenant or as determined by the appraisal process. 
 (iii) Payment of Commission. In connection with the Option, Tenant shall not use the services of a broker or other real estate
licensee, except solely for determining fair market rent as more particularly specified above. In the event of a claim for broker’s fee, finder’s fee, commission or other similar compensation in connection with the exercise of such option
based on a relationship with or through Tenant, Tenant hereby agrees to protect, defend and indemnify Landlord against and hold Landlord harmless from any and all damages, liabilities, costs, expenses and losses (including, without limitation,
reasonable attorneys’ fees and costs) which Landlord may sustain or incur by reason of such claim. Landlord hereby agrees to protect, defend and indemnify Tenant against and hold Tenant harmless from any and all damages, liabilities, costs,
expenses and losses (including, without limitation, reasonable attorneys’ fees and costs) which Tenant may sustain or incur by reason of a claim for broker’s fee, finder’s fee, commission or other similar compensation in connection
with the exercise of the Option based on a relationship with or through Landlord. 
  

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 3. Payment of Commission. In connection with this Fifth Amendment, Tenant acknowledges that it has
not used the services of a broker or other real estate licensee. In the event of a claim for broker’s fee, finder’s fee, commission or other similar compensation in connection herewith based on a relationship with or through Tenant, Tenant
hereby agrees to protect, defend and indemnify Landlord against and hold Landlord harmless from any and all damages, liabilities, costs, expenses and losses (including, without limitation, reasonable attorneys’ fees and costs) which Landlord
may sustain or incur by reason of such claim. Landlord hereby agrees to protect, defend and indemnify Tenant against and hold Tenant harmless from any and all damages, liabilities, costs, expenses and losses (including, without limitation,
reasonable attorneys’ fees and costs) which Tenant may sustain or incur by reason of a claim for broker’s fee, finder’s fee, commission or other similar compensation in connection herewith based on a relationship with or through
Landlord. 
 4. Waiver. No failure or delay by a party to insist upon the strict performance of any term, condition or covenant of
this Fifth Amendment, or to exercise any right, power or remedy hereunder shall constitute a waiver of the same or any other term of this Fifth Amendment or preclude such party from enforcing or exercising the same or any such other term,
conditions, covenant, right, power or remedy at any later time. 
 5. Representations and Acknowledgments. Tenant hereby acknowledges
that Landlord has performed all of its obligations with respect to the Premises. Tenant further acknowledges that as of the date hereof, to its best knowledge, Landlord is not in default under any of the terms of the Lease. Landlord hereby
acknowledges that Tenant has performed all of its obligations with respect to the Premises. Landlord further acknowledges that as of the date hereof, to its best knowledge, Tenant is not in default under any of the terms of the Lease.
Notwithstanding the foregoing, Landlord has not provided the reconciliation for Operating Expenses for calendar year 2005 and each party reserves its rights with respect to such reconciliation. 
 6. California Law. This Fifth Amendment shall be construed and governed by the laws of the State of California. 
 7. Authority. This Fifth Amendment shall be binding upon and inure to the benefit of the parties, their respective heirs, legal representatives,
successors and assigns. Each party hereto and the persons signing below warrant that the person signing below on such party’s behalf is authorized to do so and to bind such party to the terms of this Fifth Amendment. 
 8. Attorneys’ Fees and Costs. In the event of any action at law or in equity between the parties to enforce any of the provisions hereof, any
unsuccessful party to such litigation shall pay to the successful party all costs and expenses, including reasonable attorneys’ fees (including costs and expenses incurred in connection with all appeals) incurred by the successful party, and
these costs, expenses and attorneys’ fees may be included in and as part of the judgment. A successful party shall be any party who is entitled to recover its costs of suit, whether or not the suit proceeds to final judgment. 
 9. Entire Agreement; No Amendment. This Fifth Amendment constitutes the entire agreement and understanding between the parties with respect to the
subject of this amendment 

  

 5 

 
and shall supersede all prior written and oral agreements concerning this subject matter. This Fifth Amendment may not be amended, modified or otherwise
changed in any respect whatsoever except by a writing duly executed by authorized representatives of Landlord and Tenant. Each party acknowledges that it has read this Fifth Amendment, fully understands all of this Fifth Amendment’s terms and
conditions, and executes this Fifth Amendment freely, voluntarily and with full knowledge of its significance. This Fifth Amendment is entered into by the parties with and upon advice of counsel. 
 10. Severability. If any provision of this Fifth Amendment or the application thereof to any person or circumstances shall be invalid or
unenforceable to any extent, the remainder of this Fifth Amendment and the application of such provision to other persons or circumstances, other than those to which it is held invalid, shall not be affected and shall be enforced to the furthest
extent permitted by law. 
 11. Counterparts. This Fifth Amendment may be executed in counterparts, and such counterparts together
shall constitute but one original of the Fifth Amendment. Each counterpart shall be equally admissible in evidence, and each original shall fully bind each party who has executed it. 
 12. Agreement to Perform Necessary Acts. Each party agrees that upon demand, it shall promptly perform all further acts and execute, acknowledge,
and deliver all further instructions, instruments and documents which may be reasonably necessary or useful to carry out the provisions of this Fifth Amendment. 
 13. Captions and Headings. The titles or headings of the various paragraphs hereof are intended solely for convenience of reference and are not intended and shall not be deemed to modify, explain or place any
construction upon any of the provisions of this Fifth Amendment. 
 [Signatures on separate page] 
  

 6 

 IN WITNESS WHEREOF, the undersigned have duly executed this Fifth Amendment as of the date first above
written. 
  

									
	 TENANT:
	 		 	 LANDLORD:

			
	 XOMA Ltd.
 a Bermuda corporation
	 		 	 7TH STREET PROPERTY GENERAL PARTNERSHIP,
 a California general partnership

					
	By:	 	 /s/ J. David Boyle II
	 		 	 By:
	 	 /s/ Richard K. Robbins

	 Print Name:
	 	 J. David Boyle II
	 		 		 	 Richard K. Robbins,

	 Title:
	 	 Vice President, Finance and Chief Financial Officer
	 		 	 Its:
	 	 Managing General Partner

			
	 XOMA (US) LLC
 a Delaware limited liability company
	 		 	
					
	By:	 	 /s/ Calvin L. McGoogan
	 		 		 	
	 Print Name:
	 	 Calvin L. McGoogan
	 		 		 	
	 Title:
	 	 Vice President, Quality
	 		 		 	

  

 7 

 EXHIBIT A 
 SECOND FLOOR PREMISES 
 PLAN OF THE PREMISES INSERTED HERE. 
  

 1

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