EX-10.20





 Exhibit 10.20 

CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD
BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. 
 LICENSE AND EXCLUSIVE OPTION
AGREEMENT 
 BETWEEN 

ICOSAVAX, INC. 

AND 

UNIVERSITY OF WASHINGTON 

FOR 

COMPUTATIONALLY DESIGNED NANOPARTICLES AND VACCINES BASED
UPON SUCH DESIGNS 
 UW COMOTION AGREEMENT
REF. [***] 












 TABLE OF CONTENTS 
  

					
	 Background
	  	 	1	 
	 1. Definitions
	  	 	2	 
	 2. License and Option Grant
	  	 	6	 
	 3. Rights of University; Limitations
	  	 	8	 
	 4. Applications and Patents
	  	 	10	 
	 5. Commercialization
	  	 	11	 
	 6. Payments, Reimbursements, Reports, and Records
	  	 	11	 
	 7. Infringement
	  	 	13	 
	 8. Licensed Rights Validity
	  	 	14	 
	 9. Termination
	  	 	15	 
	 10. Release, Indemnification, and Insurance
	  	 	17	 
	 11. Warranties
	  	 	19	 
	 12. Damages
	  	 	20	 
	 13. General Provisions
	  	 	20	 
	 Exhibit A
	  	 	27	 
	 Exhibit B
	  	 	30	 
	 Exhibit C
	  	 	31	 
	 Exhibit D
	  	 	32	 














 CONFIDENTIAL 
  

 LICENSE AND EXCLUSIVE OPTION AGREEMENT 

This License and Exclusive Option Agreement (this “Agreement”), effective as of the date of last signature (the “Effective
Date”), is made and entered into between the University of Washington, a public institution of higher education and an agency of the state of Washington, (“University”), and Icosavax, Inc., a for profit corporation under
the laws of Delaware (“Company”). 
 BACKGROUND 

A.    Certain innovations relating to computationally designed two-component icosahedral
protein nanoparticles; two-component tetrahedral protein nanoparticles; and methods of multivalent antigen presentation on designed protein nanomaterials were made in the University laboratory of
Dr. David Baker, a faculty member in the Department of Biochemistry and an employee of the Howard Hughes Medical Institute (“HHMI”), and in the University laboratory of Dr. Neil King (“Principal
Investigator”), who was a research associate in the Baker laboratory and now is a faculty member in the Department of Biochemistry. 

B.    HHMI assigned its rights in such innovations to University, subject to the HHMI License (as defined herein). University now
solely owns certain intellectual property rights in such innovations as listed in Exhibit A “License Schedule” to this Agreement. Thus, University has the right to license to others certain rights to use and practice such intellectual
property. University is willing to grant those rights so that such innovations may be developed for use in the public interest. 

C.    The innovations licensed under this Agreement were funded in part by the Bill and Melinda Gates Foundation
(“BMGF”) pursuant to those certain grant agreements between BMGF and University of Washington Foundation dated [***] entitled [***] and [***] entitled [***], as amended (collectively, the “BMGF Agreements”) and
pursuant to which University made certain global access commitments to BMGF. 
 D.    University and Company entered into the
Exclusive License Agreement [***], such agreement effective as of June 29, 2018, as amended (“Other License Agreement”), pursuant to which University granted to Company a license under Licensed Know-How and the Licensed Patents in the Field of Use (as defined in the Other License Agreement). 

E.    University and Company entered into an MTA (as defined herein), pursuant to which University granted to Company a right to use
Material (as defined in the MTA) in anticipation of entering into this Agreement. 
 F.    Company desires that University grant
it a license and exclusive option under such intellectual property rights for the CV Field of Use (as defined herein), and University is willing to grant such a license and exclusive option, on the terms set forth in this Agreement. University
desires Company to commercialize the intellectual property subject to this Agreement initially for pandemic applications and ultimately for commercial applications through the license granted hereunder. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***] 
	  	 Page 1
  
















 CONFIDENTIAL 
  

 AGREEMENT 

The Parties agree as follows: 

1.    DEFINITIONS 

“Acquisition” means (a) the sale by Company of all, or substantially all of, its assets in transaction to a Third Party at
arm’s length, (b) the sale, transfer, or exchange by the shareholders, partners, or equity owners of Company of a majority interest in Company’s outstanding stock in an arm’s length transaction to a Third Party, or (c) the
merger of Company with a Third Party at arm’s length; provided, however, that in no event will (y) any bona fide equity financing for the primary purpose of raising capital for corporate purposes, or (z) any license, or any option to
obtain a license, relating to all or substantially all of Company’s rights (whether such rights pertain to this Agreement or to Company’s rights more generally) that is granted to a Third Party (whether or not collaborative or partnership
activities also will be conducted), be considered an Acquisition under this Agreement. For the avoidance of doubt, the Parties agree that any license or option to obtain a license, as stipulated in (z) above, shall be considered a Sublicense if
such license or option to obtain a license includes sublicensed rights under this Agreement. 
 “Combination Product” means a product
sold in a form containing a Licensed Product and at least one other product, component, or ingredient which could be sold separate and apart from the Licensed Product and which is not required for the function of the Licensed Product. 

“Confidential Information” means any information or materials of a Party not generally known to the public, including any information
comprised of those materials and Company’s business plans or reports. Confidential Information does not include any information that: (a) is, or becomes, part of the public domain through no fault of receiving Party; (b) is known to
receiving Party prior to the disclosure by the disclosing Party, as evidenced by documentation; (c) is publicly released as authorized under this Agreement by University, its employees or agents; (d) is subsequently obtained on a non-confidential basis by receiving Party from a Third Party who is authorized to have and disclose such information; or (e) is independently developed by receiving Party without reliance on any portion of the
Confidential Information received from the disclosing Party and without any breach of this Agreement as evidenced by documentation. 
 “CV
Field of Use” means prophylactic and/or therapeutic treatments for the coronavirus known as SARS-CoV-2. 

“Developing Countries” means the list of countries set forth on Exhibit C. 

“Distributor” means a distributor, reseller or OEM to which a Licensed Party sells a Licensed Product for resale of Licensed Product by
the Distributor, and where Distributor has no other rights with respect to the Licensed Rights other than to resell or otherwise distribute Licensed Products (including but not limited to integrated or bundled with other products or services), and
for which resale or distribution such Licensed Party receives no further consideration (including but not limited to royalties and/or commissions) beyond the price for the initial sale of Licensed Product to the Distributor. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 2
















 CONFIDENTIAL 
  

 “Event of Force Majeure” means an unforeseeable act that prevents or delays a Party
from performing one or more of its duties under this Agreement and that is outside of the reasonable control of the affected Party. An Event of Force Majeure includes acts of war or of nature, insurrection and riot, and labor strikes. An Event of
Force Majeure does not include a Party’s inability to obtain a Third Party’s consent to any act or omission, unless the inability was caused by a separate Event of Force Majeure. 

“Improvements” means patentable inventions that (a) are owned by University after the Effective Date and not encumbered by third
party rights that would prevent delivery to Company, (b) would require a license under the exclusively Licensed Rights to practice, (c) were developed in the laboratory of the Principal Investigator, and identified to UW CoMotion as
Improvements falling under this license, and (d) do not include an HHMI employee as an inventor under the applicable patent law. 

“Licensed Know-How” means University knowledge or intangible work that: (a) was developed
in the laboratory of Principal Investigator, (b) exists as of the Effective Date, (c) is relevant to utilizing any of the Licensed Patents, (d) is unpublished, (e) is not subject to patent or copyright protection, and (f) is
not covered by Third Party rights that would prevent delivery to Company. 
 “Licensed Party” mean Company or any of its
Sublicensees. 
 “Licensed Patents” means (a) the patents and patent applications listed in Exhibit A1.1 “Licensed
Patents”, all (b) divisions, continuations, and claims in continuations-in-part that are entitled to claim priority to, or that share a common priority claim
with, and are directed to subject matter specifically described in, any item listed on Exhibit A1.1 “Licensed Patents”; (c) claims of extensions, renewals, substitutes, re-examinations and re-issues of any of the items in (a) or (b) that are directed to subject matter specifically described in any items listed on Exhibit A1.1; and (d) claims of foreign counterparts of any of the items in
(a), (b), or (c) that are directed to subject matter specifically described in any items listed on Exhibit A1.1, wherever and whenever filed. 

“Licensed Product” means any method, process, composition, product, service, or component part thereof that would, but for the granting
of the rights set forth in this Agreement, infringe a Valid Claim contained in the Licensed Patents. 
 “Licensed Rights” means all
rights granted to Company under Article 2 “License and Option Grants” of this Agreement. 
 “MTA” means the Materials
Transfer Agreement [***] between University and Company entered into as of May 13, 2020. 
 “Net Sales” means the gross amount
received by a Licensed Party from Distributors, customers, end users and other Third Parties for sales, leases, and other dispositions of Licensed Products, less [***]. On sales of Licensed Products by made in other than an arm’s length
transaction, the value of the Net Sales attributed to such transaction will be equal to the Net Sales that would have been received in an arm’s length transaction, based on sales of like quantity and quality of Licensed Products sold on or
about the time of the transaction. Net Sales does not include sale, lease, disposition or other transfer of Licensed Products among or between Company, Subsidiaries and Sublicensees for the purpose of subsequent


  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 3
















 CONFIDENTIAL 
  

 resale to a Third Party, but does include subsequent resale to such Third Party. For avoidance of doubt
Net Sales are calculated on sales by a Licensed Party to Distributor, and not on the subsequent sale by Distributor. 
 Net Sales of Combination
Products will be calculated by multiplying actual Net Sales of such Combination Products by the fraction A/(A+B), where “A” is the Net Sales price of the Licensed Product if sold or performed separately, and “B” is the Net Sales
price of the other product, component or ingredient in the Combination Product if sold separately. If, on a country-by-country basis, the other product, component or
ingredient in the Combination Product is not sold separately in said country, Net Sales for the purpose of determining running royalties of the Combination Product shall be calculated by multiplying actual Net Sales of the Combination Product by the
fraction A/C where “A” is the Net Sales price of the Licensed Product, if sold separately, and “C” is the Net Sales price of the Combination Product. If, on a
country-by-country basis, neither the Licensed Product, nor the other product, component or ingredient in the Combination Product, is sold separately in said country,
Net Sales for the purpose of determining running royalties of the Combination Product shall be determined in good faith by the Parties. A Combination Product may include a Licensed Product and any separate product, component or ingredient or service
developed by or in-licensed by a Licensed Party from a Third Party provided it is a Combination Product as defined in this Agreement. 

“New Patent Applications” means patents and patent applications which claim Improvements and that the Company elects under
Section 2.4 “Improvements” to include in the Licensed Patents. 
 “Option Effective Date” means the fifth (5th)
anniversary of the Effective Date if Company has provided an Option Exercise notice to University pursuant to Section 2.1.2. 
 “Option
Territory” means the United States, Canada, Mexico, and the countries of Europe (including without limitation Switzerland and United Kingdom of Great Britain and Northern Ireland), and their respective territories and possessions.

 “Parties” means University and Company and “Party” means either University or Company. 

“Patent Expenses” means all reasonable costs (including attorneys’ and application fees) incurred by University in accordance with
this Agreement to apply for, prosecute and maintain Licensed Patents, including but not limited to the costs of interferences, oppositions, inter partes review and re-examinations. Costs for interferences,
oppositions, inter partes review, re-examinations and other complex and expensive patent-related proceedings will be incurred in consultation with Company, pursuant to the processes of Article 4
“Applications and Patents”. Patent Expenses also include reimbursement for in-house costs to apply for, prosecute and maintain Licensed Patents; provided they are for activities that would otherwise
have been performed by outside counsel at an equal or greater expense. 
 “Performance Milestone” means any of the
milestones described in Section A2 “Performance Milestones” of attached Exhibit A “License Schedule”. 
 “Performance
Milestone Date” means the date by which a Performance Milestone is to be achieved as 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 4
















 CONFIDENTIAL 
  

 set forth in Section A2 “Performance Milestones” of attached Exhibit A “License
Schedule”, as such date may be extended pursuant to Section 5.1 “Performance Milestones” or as otherwise agreed upon by the Parties. 

“Permitted Sublicense” means any arm’s length agreement with a Third Party commercialization partner, manufacturer,
contract research organization or contract researcher/developer with whom a Licensed Party contracts for commercialization, manufacture, research or development of Licensed Products on Licensed Party’s behalf, and where such Third Party has no
other rights with respect to the Licensed Rights other than to manufacture, research and/or develop on behalf of Licensed Party. 
 “Permitted
Sublicensee” means a Third Party holding a Permitted Sublicense. 
 “Sales Report” means a report in substantially
the form set forth in Exhibit B “Royalty Report Form”. 
 “Sublicense” means the grant by a Licensed Party to a Third Party
of any license, option, first right to negotiate, or other right granted under the Licensed Rights, in whole or in part. The grant of the right to resell to a Distributor and the grant of a license or other right to use a Licensed Product to an
end-user, where the end user has no other rights with respect to the Licensed Rights other than to be an end user of the Licensed Product, will not be a Sublicense and will be treated solely under Net Sales.

 “Sublicensee” means a Third Party holding a Sublicense under the Licensed Rights. 

“Sublicense Consideration” means all consideration, including but not limited to [***]; but excluding royalties on Net Sales, received
by Company from each Sublicensee for the grant of a Sublicense. For avoidance of doubt, consideration paid to Company by Sublicensees for the following shall not be deemed Sublicense Consideration: [***]. For clarity, University acknowledges and
agrees that, if Company should enter into an agreement with a Third Party that includes a Sublicense as part, but not all, of the subject matter of such agreement, then the total non-royalty consideration paid
to Company under such Third Party agreement will not be deemed Sublicense Consideration merely because a Sublicense is granted (since only a portion of the consideration received is for the grant of the Sublicense). 

Furthermore, to the extent that this Agreement has not been assigned by Company prior to the date Sublicense Consideration is received by Company,
[***], shall be excluded from Sublicense Consideration, as stipulated in the paragraph above in (a)(ii). Company will provide to University a copy of the Operating Expense Budget together with a copy of the executed Sublicense as required by
Section 2.3 “Sublicense Rights”. 
 “Territory” means worldwide, excluding South Korea. 

“Third Party” means an individual or entity other than University and Company. 

“Valid Claim” means (a) a claim in an issued, unexpired United States or granted foreign patent included in the Licensed
Patents that: (i) has not been held invalid, unpatentable, or unenforceable by a decision of a court or other governmental agency of competent jurisdiction and not subject to appeal (ii) has not been admitted to be invalid or unenforceable
through reissue, inter partes review, disclaimer, or 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 5
















 CONFIDENTIAL 
  

 otherwise, (iii) has not been lost through an interference, reexamination, or reissue proceeding;
or (b) a pending claim of a pending patent application included in the Licensed Patents. 
 Additional Definitions. The following
terms have the meanings set forth in the corresponding sections of this Agreement, as described below. 
  

			
	 Defined Term
	  	Section
	 “Accountants”
	  	6.5.1
	 “Act”
	  	13.3.3
	 “Agreement”
	  	Preamble
	 “BMGF”
	  	Background
	 “BMGF Agreements”
	  	Background
	 “Claim”
	  	10.2
	 “Company”
	  	Preamble
	 “Dispute Notice”
	  	13.4
	 “Effective Date”
	  	Preamble
	 “HHMI”
	  	Background
	 “HHMI Claims”
	  	10.2
	 “HHMI Indemnitees”
	  	10.2
	 “HHMI License”
	  	2.8
	 “Indemnitee”
	  	10.2
	 “Initial Notice Period”
	  	9.8
	 “Option Exercise”
	  	2.1.2
	 “Other License Agreement”
	  	Background
	 “Principal Investigator”
	  	Background
	 “Sell-Off Period”
	  	9.6
	 “Subsidiaries”
	  	2.7
	 “University”
	  	Preamble

 2.     LICENSE AND OPTION
GRANTS. Subject to the terms and conditions of this Agreement: 
 2.1    Patent License and
Option. 
  

	2.1.1	 Non-exclusive license. University hereby grants to Company a non-exclusive license under the Licensed Patents to make, have made on Company’s behalf, use, offer to sell, sell, offer to lease or lease, import, or otherwise offer to dispose of Licensed Products in the
Territory in the CV Field of Use. Unless otherwise terminated under Article 9 “Termination”, the term of this non-exclusive patent license will begin on the Effective Date and will
continue until the date on which all Valid Claims expire or are held invalid or unenforceable by a court of competent jurisdiction from which no appeal can be taken, provided that such license will expire with respect to Licensed Products in the
Option Territory on the Option Effective Date. 


  

	2.1.2	 Option for exclusive license, and if exercised, exclusive license. University hereby grants to




  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 6
















 CONFIDENTIAL 
  


	 	 Company an exclusive option to obtain an exclusive (subject only to any rights of the government described in
Section 2.6 “The United States Government’s Rights”, to rights of University described in Article 3 “Rights of University; Limitations”, to rights of BMGF described in Sections 3.3 “Reservation of Rights for
Humanitarian Purposes” and 3.4 “BMGF Humanitarian License”, and to rights of HHMI described in Section 2.8 “HHMI Research Use Rights”) royalty-bearing (as set forth in Section 6.1) license under the Licensed
Patents to make, have made on Company’s behalf, use, offer to sell, sell, offer to lease or lease, import, or otherwise offer to dispose of Licensed Products in the CV Field of Use in the Option Territory.    Company may
exercise such option by providing University a written notice (the “Option Exercise”) [***]. Unless otherwise terminated under Article 9 “Termination”, the term of this exclusive patent license will begin on
the Option Effective Date and will continue until all Valid Claims expire or are held invalid or unenforceable by a court of competent jurisdiction from which no appeal can be taken. Assuming Company provides the Option Exercise notice, such
exclusive license will become effective automatically on the Option Effective Date. 


 2.2    Know-How License. University hereby grants to Company a non-exclusive, worldwide license to use Licensed Know-How. Unless otherwise
terminated under Article 9 “Termination”, the term of this license will begin on the Effective Date and will continue until all rights under Licensed Patents are terminated. 

2.3    Sublicense Rights. Company has the right, exercisable during the term of this Agreement, to Sublicense its Licensed
Rights under this Agreement. Company may not grant Sublicensees the right to enforce Licensed Rights. Company will remain responsible for its obligations under this Agreement. Except for Permitted Sublicensees, Company will ensure that the
Sublicense agreement: (a) contains terms and conditions that require Sublicensee to comply with the terms and conditions of this Agreement applicable to Sublicensees, including a release substantially similar to that provided by Company in
Section 10.1 “Company’s Release”; a warranty substantially similar to that provided by Company in Section 11.1 “Authority”; University disclaimers and exclusions of warranties under Sections 11.3 and 11.4 “No
Known Infringement” and “Disclaimer”; and limitations of remedies and damages substantially similar to those provided by Company in Sections 12.1 “Remedy Limitation” and 12.2 “Damage Cap”; (b) specifically
incorporates provisions of this Agreement regarding obligations pertaining to indemnification, use of names and insurance. Each Sublicense agreement must also contain obligations, terms and conditions in favor of HHMI or the HHMI Indemnitees, as
applicable, that are substantially similar to those undertaken by Company in favor of HHMI or the HHMI Indemnitees, as applicable, under this Agreement and intended for the protection of the HHMI Indemnitees, including, without limitation, the
obligations, terms and conditions regarding indemnification, insurance and HHMI’s third party beneficiary status. Company will provide University with a copy of the executed Sublicense, excluding any Permitted Sublicense agreement, within
thirty (30) days after its execution. Company will not enter into any Sublicense agreement if the terms of such agreement are inconsistent in any material respect with the material terms of this Agreement. Any Sublicense made in violation of
this Section 2.3 “Sublicense Rights” will be void and will constitute an event of default that requires remedy under Section 9.2 “Termination by University”. 

2.4    Improvements. For a period of [***] after the Effective Date, University will provide reasonable written notice to
Company of any Improvements to the Licensed Patents. Company will have the option, exercisable within ninety (90) days of receipt of University’s notice of such Improvement, to add such 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 7
















 CONFIDENTIAL 
  

 Improvements to the Licensed Patents. If Company exercises its option to add Improvements to the
Licensed Patents, the Licensed Patents thereafter will include the applicable New Patent Applications, and the Parties will revise Exhibit A “License Schedule” to include such Improvements. 

2.5    Limitation of Rights. No provision of this Agreement grants to Company, by implication, estoppel or otherwise,
any rights other than the rights expressly granted it in this Agreement under the Licensed Rights, including any license rights under any other University-owned technology, copyright, know-how, patent
applications, or patents, or any ownership rights in the Licensed Rights. 
 2.6    The United States Government’s
Rights. Inventions covered in the Licensed Patents arose, in whole or in part, from federally supported research and the federal government of the United States of America has certain rights in and to such inventions as
those rights are described in Chapter 18, Title 35 of the United States Code and accompanying regulations, including Part 401, Chapter 37 of the Code of Federal Regulation. The Parties’ rights and obligations under this Agreement to any
government-funded inventions, including the grant of license set forth in Section 2.1 “Patent License”, are subject to the applicable terms of the aforementioned United States laws. The U.S. Government is entitled, as a right,
under these Chapters: (a) to a nonexclusive, nontransferable, irrevocable, paid-up license to practice or have practiced for or on the behalf of the U.S. Government any of the federally funded inventions
throughout the world and (b) to exercise march in rights on the federally funded inventions. Company further agrees that, to the extent required by Title 35 Section 204 of the United States Code, it will substantially manufacture in the
United States of America all products embodying or produced through the use of any such federally funded invention. 

2.7    Rights to Wholly Owned Subsidiaries of Company. Company may extend rights granted to Company under this Agreement to
wholly owned subsidiaries (“Subsidiaries”) of Company, provided that (a) Company is responsible for all acts of such Subsidiaries as if they were acts of the Company, (b) such Subsidiary is bound in writing to perform all
obligations to University and HHMI of this Agreement other than making payments pursuant to Article 6 “Payments, Reimbursements, Reports, and Records”, as if such Subsidiary were Company, and (c) Company reports to University pursuant
to Section 13.10 “Notices” that such Subsidiary will be exercising rights under this Agreement prior to such Subsidiary exercising any such rights under this Agreement. For avoidance of doubt, Company may perform any obligation of
Subsidiary on Subsidiary’s behalf. 
 2.8    HHMI Research Use Rights. Company acknowledges that it has been informed
that the Licensed Patents were developed, at least in part, by employees of HHMI and that HHMI has a paid-up, non-exclusive, irrevocable license to exercise any
intellectual property rights with respect to the Licensed Patents for research purposes, with the right to sublicense to non-profit and governmental entities, but with no other rights to assign or sublicense
(the “HHMI License”). This license is explicitly made subject to the HHMI License. 

3.    RIGHTS OF UNIVERSITY; LIMITATIONS 

3.1    University’s Rights. University reserves all rights not expressly granted to Company under this Agreement.
University retains for itself and other not-for-profit research institutions, an irrevocable, nonexclusive right to practice Licensed Rights for research, instructional
or educational purposes. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 8
















 CONFIDENTIAL 
  

 Expressly included, without limitation, within this University reservation of rights is the right to do
the following in connection with such research, instructional or educational purposes: (a) to use the Licensed Rights in sponsored research or collaborative research with any Third Party, but not for any commercial purpose, and only to the
extent that no such Third Party is granted any commercialization rights of any kind under the Licensed Rights or to commercialize Licensed Products, (b) to grant material transfer agreements that restrict the use of such materials to research,
teaching or other scholarly activities, and that the transferee has no rights greater than University, and has no further right to transfer such materials to any Third Party, and (c) to publish any information included in the Licensed Rights or
any other information that may result from University’s research. 
 3.2    Sublicensing Opportunities. If a Third
Party notifies University after the Option Effective Date that it wishes to license any of the exclusively Licensed Rights in any territory in which Company is unable or unwilling to develop and market a Licensed Product that University reasonably
believes Company is not diligently pursuing, University will notify Company in writing of such Third Party’s wish to obtain such license, and Company will have good faith discussions with such Third Party regarding the terms and conditions
under which such Sublicense could be obtained. Company will not be obligated to provide such sublicense where it interferes with Company’s business strategy; however, Company will not unreasonably withhold such Sublicense. 

3.3    Reservation of Rights for Humanitarian Purposes. Consistent with 35 U.S.C. §200 et seq., University retains the
right to require Company to grant Sublicenses to responsible applicants in the CV Field of Use under the Licensed Patents on terms that are reasonable under the circumstances; or, if Company fails to grant a license, to grant the license itself. The
exercise of these rights by University will only be in exceptional circumstances and only if University determines (a) the action is necessary to meet health or safety needs that are not reasonably satisfied by Company; or (b) the action
is necessary to meet requirements for public use specified by federal regulations, and such requirements are not reasonably satisfied by Company. In addition, University retains the right to require Company to grant Sublicenses in the CV Field of
Use under the Licensed Patents on terms that are reasonable under the circumstances solely to allow the Licensed Products to be available and accessible at an affordable price in Developing Countries, or, if Company fails to offer to grant a license
on reasonable terms, to grant the license itself to meet global access obligations agreed to by University under the BMGF Agreements in connection with funding of research that led to the Licensed Patents and such obligations are not reasonably
satisfied by Company. University will not require the granting of a Sublicense, and will not grant the license itself, unless the responsible applicant has first negotiated in good faith with Company. Company shall be entitled to use the dispute
resolution mechanisms of Section 13.4 “Escalation; Dispute Resolution”, including seeking an injunction from the court if mediation is unsuccessful, if Company wishes to dispute that University should be entitled to exercise its
rights under this Section 3.3. 
 3.4    BMGF Humanitarian License. Company acknowledges that the University has
agreed to the following grantback (the “Humanitarian License”) pursuant to the BMGF Agreements for the CV Field of Use, and the University will retain rights under the Licensed Patents and License
Know-How necessary to comply with the Humanitarian License below (where You is the University), subject to the terms and conditions contained in Exhibit D: 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 9
















 CONFIDENTIAL 
  

 Subject to applicable laws and for the purpose of achieving Global Access, You grant
the Foundation a nonexclusive, perpetual, irrevocable, worldwide, royalty-free, fully paid up, sublicensable license to make, use, sell, offer to sell, import, distribute, copy, create derivative works, publicly perform, and display Funded
Developments and Essential Background Technology. “Essential Background Technology” means Background Technology that is: (a) owned, controlled, or developed by You, or in-licensed with the right
to sublicense; and (b) either incorporated into a Funded Development or reasonably required to exercise the license to a Funded Development. If You demonstrate to the satisfaction of the Foundation that Global Access can best be achieved
without this license, the Foundation and You will make good faith efforts to modify or terminate this license, as appropriate. 
 4.
    APPLICATIONS AND PATENTS 
 4.1    Pre-Agreement Patent Filings. Company has reviewed the Licensed Patents and as of the Effective Date is not aware of any basis to challenge or dispute the inventorship, validity, or enforceability of any of the
claims made in the Licensed Patents. 
 4.2    Patent Prosecution Decisions. University and Company will consult on the
preparation, filing and prosecution of the Licensed Patents (including, without limitation, on the selection of patent counsel). Patent counsel will be directed to deliver to Company all written and electronic communications to and from all patent
offices and foreign counsel, and provide summaries of oral communications with patent offices. Provided Company is in compliance with Section A3.8 “Patent Expense Payment” of Exhibit A “License Schedule”, Company’s
directions regarding patent preparation, filing and prosecution will be followed unless detrimental to University’s intellectual property rights. University and Company will consult prior to deciding in which countries to pursue patent
protection and provided Company is in compliance with Section A3.8 “Patent Expense Payment”, patents will be filed in all countries Company designates. University acknowledges the key role and value of the Licensed Patent portfolio to
Company and the need for timely review and exchange of information between University and Company prior to Licensed Patent portfolio decisions. University will remain the client of record, and may at its own expense instruct patent counsel to take
actions necessary to protect University’s intellectual property rights, if in University’s reasonable opinion, Company actions will result in a loss of rights; provided that for any such actions, if Company declines to reimburse University
pursuant to Section A3.8 “Patent Expense Payment” of Exhibit A “License Schedule”, those applications and resultant patents will not be subject to this Agreement. In no event will Company file a patent application where all of
the inventors are under University policy obligated to assign their rights in such patent application to University. 

4.3    Assumption of Patent Prosecution and Maintenance. Provided Company is in compliance with Section A3.2 “Patent
Expense Payment” of Exhibit A “License Schedule”, University will take all commercially reasonable steps to cause patents and patent applications within the Licensed Patents to be diligently prosecuted and maintained. If Company is in
compliance, and University, against Company’s instructions, decides to abandon or allow to lapse any patent application or any claim of any patent included in the Licensed Patents or not pursue patent protection for any foreign patent mutually
agreed upon by the Parties under Section 4.2 “Patent Prosecution Decisions”, University will notify Company at least sixty (60) days before such decision would be effective, and Company will have the right to file,


  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 10
















 CONFIDENTIAL 
  

 
prosecute, and maintain, as applicable, such patent or patent application at Company’s expense provided Company shall keep University informed of such activity. Company may thereafter
abandon or allow to lapse any or all patents or patent applications for which it is responsible. Company will notify University of any abandoned or lapsed patents within thirty (30) days of such abandonment or lapse. 

5.    COMMERCIALIZATION 

5.1    Performance Milestones. Company will, directly or through its Subsidiaries or Sublicensees, use its commercially
reasonable efforts, consistent with sound and reasonable business practices and judgment, to commercialize the Licensed Rights and to make and sell Licensed Products as soon as practicable and to maximize sales thereof. Company shall perform, or
shall cause to happen or be performed, the Performance Milestones in accordance with the Performance Milestone Dates. 

5.2    Renegotiation of Performance Milestones. If Company determines that it will be unable to achieve a Performance
Milestone by the applicable Performance Milestone Date, Company will so notify University in advance of the Performance Milestone Date, and, provided Company demonstrates it is diligently pursuing commercialization of at least one Licensed Product,
Company shall have the option of negotiating in good faith an appropriate new Performance Milestone and/or related Performance Milestone Date to accommodate for the reasonable length of the delay. In addition, University agrees that the Performance
Milestone Dates shall be extended by the number of days of delay caused by any event reasonably deemed out of the control of Company, [***], including without limitation an Event of Force Majeure, the actions or inactions of any regulatory authority
necessary for Company’s plans to commercialize the Licensed Rights, or inability to enroll clinical trials due to lack of eligible participants. If the Parties are unable to agree on a renegotiated Performance Milestone [***], then University
may proceed with its termination rights under Section 9.2 “Termination by University”, subject to both Company and University having the right to seek mediation under Section 13.4 “Escalation; Dispute Resolution”. 

5.3    Commercialization Reports. Throughout the term of this Agreement and during the
Sell-Off Period, and within thirty (30) days of December 31st of each year, Company will deliver to University written reports of Company’s and
Sublicensees’ efforts and plans to develop and commercialize the innovations covered by the Licensed Rights and to make and sell Licensed Products. Company will have no obligation to prepare commercialization reports in years where
(a) Company delivers to University a written Sales Report with active sales, and (b) Company has fulfilled all Performance Milestones. In relation to each of the Performance Milestones each commercialization report will include sufficient
information to demonstrate achievement of those Performance Milestones and will set out timeframes and plans for achieving those Performance Milestones which have not yet been met. 

5.4    Company Information. Throughout the term of this Agreement, Company shall provide the names of, and sufficient contact
information to identify, any Permitted Sublicensees within thirty (30) days of University’s written request. 

6.    PAYMENTS, REIMBURSEMENTS, REPORTS, AND RECORDS

 6.1    Payments. Company will deliver to University the payments specified in Section A3 “Payments”


  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 11
















 CONFIDENTIAL 
  

 
of attached Exhibit A “License Schedule”. Company will make such payments by check, wire transfer, or any other mutually agreed-upon and generally accepted method of payment. All checks
to University will be made payable to “University of Washington” and will be mailed to the address specified in Section 13.10 “Notices” and will reference the University agreement number [***]. 

All wire or electronic fund transfers must be confirmed via email referencing the above agreement number to: ipfin@uw.edu 

 

			
	Wire transfers:	  	Electronic Fund Transfer (ACH):

 [***] 

6.2    Currency and Checks. All computations and payments made under this Agreement will be in United States dollars. The
exchange rate for the currency into dollars as reported in The Wall Street Journal as the New York foreign exchange mid-range rate on the last business day of the month in which the transaction
was entered into will be used for determining the dollar value of transactions conducted in non-United States dollar currencies. 

6.3    Late Payments. University may charge Company a late fee for all amounts owed to University that are more than thirty
(30) days overdue; provided that, for any portion of any such amount that is the subject of a bona fide, good faith dispute by Company (the mechanism of such dispute governed by Section 13.4 “Escalation; Dispute Resolution”), the
late fee shall not apply to such disputed portion unless and until the dispute is decided in University’s favor. The late fee will be computed as [***], compounded monthly, as set forth by The Wall Street Journal (Western edition) on the
date on which the payment is due, of the outstanding, unpaid balance. The payment of a late fee will not foreclose or limit University from exercising any other rights it may have as a consequence of the lateness of any payment. 

6.4    Sales Reports. Within sixty (60) days after the last day of each calendar quarter commencing with the calendar
quarter after the Option Effective Date and after the Company effects its first commercial sale of a Licensed Product and during the term of this Agreement and the Sell-Off Period, Company will deliver to
University the Sales Report setting forth the number of and Net Sales amount (expressed in U. S. dollars) of all sales, leases, or other dispositions of Licensed Products, whether made by Company or a Sublicensee, during such calendar quarter.
Included in each sales report will be the name of each Distributor, and the number and type of Licensed Product sold, leased, or otherwise provided to such Distributor. After the Option Effective Date and after the first commercial sale of a
Licensed Product in the Territory, Company will deliver a written Sales Report to University even if Company is not required hereunder to pay to University a royalty payment during the calendar quarter. Company shall provide the names of Permitted
Sublicensees within thirty (30) days at University’s written request. 
 6.5    Books and Records.
Throughout the term of this Agreement [***], Company, at its expense, will keep and maintain and shall cause each Sublicensee other than Permitted Sublicensees to keep and maintain complete and accurate records of all sales, leases, and other
dispositions of Licensed Products and all other records related to this Agreement. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 12
















 CONFIDENTIAL 
  

 6.5.1    Audit Rights. After the Option Effective Date,
Company will permit at the request of University (not to be made more than once in any given calendar year), one or more independent, certified accountants selected by University and reasonably acceptable to Company (which acceptance shall not be
unreasonably withheld or delayed) (“Accountants”) to have access to Company’s records and books of account pertaining to calculation of Net Sales and payment of any other amounts owed under this Agreement. Accountants’
access will be during ordinary working hours to audit Company’s records for any payment period ending prior to such request, the correctness of any Sales Report or payment made under this Agreement, or to obtain information as to the payments
due for any period in the case of failure of Company to report or make payment under the terms of this Agreement or to verify Company’s compliance with its payment obligations hereunder. Accountants will sign Company’s standard non-disclosure agreement provided it is reasonable to the industry in which Company operates. Company shall cause each Sublicensee, other than Permitted Sublicensees, that manufactures, sells, leases, or otherwise
disposes of Licensed Products on behalf of Company to grant University the rights to inspect and audit Sublicensee’s records. 

6.5.2    Scope of Disclosure. Accountants will not disclose to University any information relating to the
business of Company except that which is necessary to inform University of: (a) the accuracy or inaccuracy of Company’s Sales Reports and payments; (b) compliance or noncompliance by Company with the terms and conditions of this
Agreement; or (c) the extent of any inaccuracy or noncompliance. A copy of the Accountants’ report will be provided to Company. 

6.5.3    Accountant Copies. If Accountants believe there is an inaccuracy in any of Company’s payments or
noncompliance by Company with any terms and conditions, Accountants will have the right to make and retain copies (including photocopies) of any pertinent portions of the records and books of account. 

6.5.4    Costs of Audit. If Company’s payments calculated for any calendar quarter are under-reported by
more than [***], the costs of any audit and review initiated by University will be borne by Company; otherwise, University shall bear the costs of any audit initiated by University. 

7.    INFRINGEMENT 

7.1    Notice of Third Party’s Infringement. If a Party learns of substantial, credible evidence that a Third Party is
infringing exclusively Licensed Rights, that Party will promptly deliver written notice of the possible infringement to the other Party, describing in detail all relevant information to which that Party has access or control suggesting infringement
of the Licensed Rights. 
 7.2    Company’s Right to Enforce. During the term of this Agreement, Company has the first
right to respond to, defend, and prosecute in its own name, and at its own expense, actions or suits relating to exclusively Licensed Rights. University may request in writing that Company take action against known infringer. If required by law or
otherwise legally necessary for such action to proceed, Company may request that University be joined as a party plaintiff and University will consider such request in good faith, such request not to be unreasonably denied, provided that
(a) Company must notify University at 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 13
















 CONFIDENTIAL 
  

 
least ten (10) days before filing suit, and (b) Company will reimburse University for all reasonable legal fees and costs incurred by University in connection with such action. Company
will not settle any suits or actions in any manner relating to the Licensed Rights that is detrimental to the University or to the scope or validity of Licensed Rights, without obtaining the prior written consent of University, which consent shall
not be unreasonably withheld or delayed. University will keep Company reasonably informed of any matters relating to the defense or prosecution of actions or suits relating to non-exclusively Licensed Rights
and will consider in good faith any comments of Company with respect thereto.  
 7.3    Distributions. Out of any
Sublicense fees, royalties, damages, awards, or settlement proceeds from any settlement or judgment for infringement of Licensed Rights, Company is allowed to first recover its reasonable attorney’s fees and other
out-of-pocket expenses directly related to any action, suit, or settlement for infringement of the Licensed Rights. Any payment by an alleged infringer that, under the
terms of the applicable settlement agreement or judgment, (a) constitutes consideration for Net Sales of infringing product (or an equivalent characterization in the nature of a product royalty) will be handled according to the payment
provisions in Section A3.2 “Running Royalty Payments”, and (b) constitutes consideration for the grant of a Sublicense (or an equivalent characterization) will be distributed [***] to Company and [***] to University. 

7.4    Limitation on Infringement Actions. Excluded from the rights granted herein is the right to bring an infringement
action against a not-for-profit entity for infringement of the License Rights in carrying out
not-for-profit research. 
 7.5    University
Right to Institute Action. If Company fails, within [***] of receiving of the University’s written request to take action against an alleged infringer of exclusively Licensed Rights, to secure cessation of the infringement, institute suit
against the infringer, or to provide to University satisfactory evidence that Company is engaged in bona fide negotiations for the acceptance by infringer of a Sublicense to the relevant Licensed Rights, then University may, upon written notice to
Company, assume full right and responsibility to secure cessation of the infringement or institute suit against the infringer, or secure acceptance of a Sublicensee by Company from the alleged infringer in the relevant Licensed Patents. If
University, in accordance with the terms and conditions of this Agreement, chooses to institute suit against an alleged infringer, University may bring such suit in its own name (or, if required by law, in its and Company’s name) and at its own
expense, and Company will, but at University’s expense for Company’s direct associated expenses, fully and promptly cooperate and assist University in connection with any such suit. All license fees, royalties, damages, awards, or
settlement proceeds arising from such a University-initiated action will be solely for the account of University. 
 7.6    No
Obligation to Institute Action. Neither Company nor University is obligated under this Agreement to institute or prosecute a suit against any alleged infringer of the Licensed Rights. 

8.    LICENSED RIGHTS VALIDITY 

8.1    Notice and Investigation of Third Party Challenges. If any Third Party challenges the validity or enforceability of any
of the Licensed Rights, the Party having such information will immediately notify the other Party. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 14
















 CONFIDENTIAL 
  

 8.2    Third Party Actions. In the event of a Third Party legal action
challenging the validity or enforceability of any exclusively Licensed Rights, Company in its sole discretion will have the right to assume and control the sole defense of the claim at Company’s expense. Company will not settle any suits or
actions in any manner relating to such Licensed Rights without obtaining the prior written consent of University, which consent shall not be unreasonably withheld or delayed; provided, however, that the Parties agree that loss of University’s
intellectual property rights is a reasonable reason to withhold consent. Further, if Company is not diligently protecting University’s intellectual property rights, or if Company does not elect to assume and control the sole defense of the
Third Party legal action within [***] after becoming aware of challenge, University will have the right to assume the defense of the action at its own expense. University will not settle any suits or actions in any manner relating to the Licensed
Rights without considering in good faith any comments from Company. University will keep Company reasonably informed of any matters relating to any Third Party legal action challenging the validity or enforceability of any non-exclusively Licensed Rights and will consider in good faith any comments of Company with respect thereto. 

8.3    Enforceability of Licensed Rights. Notwithstanding challenge by any Third Party, any Licensed Right will be
enforceable under this Agreement until such Licensed Right is determined to be invalid. 
 9.    TERMINATION

 9.1    End of Term. This Agreement will expire, unless terminated earlier as provided in this Article 9
“Termination”, without further action by the Parties, when all Licensed Rights have terminated pursuant to Article 2 “License and Option Grant”, and all obligations due to University based on the exercise of such Licensed Rights
have been fulfilled. 
 9.2    Termination by University. If Company materially breaches or fails to perform one or more of
its material duties under this Agreement, University may deliver to Company a written notice of default, which notice will (a) state that it is a notice of default, (b) state that University intends to terminate this Agreement if the
default is not cured in ninety (90) days, and (c) identify the material duty or duties to which such default relates. Subject to Section 13.4 “Escalation; Dispute Resolution”, University may terminate this Agreement by
delivering to Company a written notice of termination if the default has not been cured within ninety (90) days of the delivery to Company of the notice of default; provided, however, if Company can reasonably demonstrate to University that it
is proceeding diligently and in good faith to cure such default but cannot do so within such ninety (90) day period, University will extend such cure period for another ninety (90) day period, or such longer period approved by University.
In addition, University may terminate this Agreement in part pursuant to Section 5.2 “Renegotiation of Performance Milestones”. 

9.3    Events of Default. University may terminate this Agreement by delivering to Company a written notice of termination at
least ten (10) days prior to the date of termination if Company (i) permanently ceases operations; (ii) voluntarily files or has filed against it a petition under applicable bankruptcy or insolvency laws that Company fails to have
released within thirty (30) days after filing; (iii) proposes any dissolution, composition, or financial reorganization with creditors or if a receiver, trustee, custodian, or similar agent is appointed; (iv) makes a general
assignment for the benefit of creditors; or (v) if Company challenges the validity of the Licensed Patents. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 15
















 CONFIDENTIAL 
  

 9.4    Disputing Events of Default. Notwithstanding the foregoing, if
Company disputes that a default has occurred as contemplated above or that a default has not been cured, Company may use the dispute resolution mechanism outlined in Section 13.4 “Escalation; Dispute Resolution”. 

9.5    Termination by Company. Company may terminate this Agreement at any time by delivering to University a written notice
of termination at least sixty (60) days prior to the effective date of termination. In addition, Company may propose to terminate certain of its Licensed Rights hereunder by delivering to University a written notice of termination accompanied
by a proposed written amendment to this Agreement at least sixty (60) days prior to the effective date of termination of such Licensed Rights. For clarity, such amendment will become effective upon execution of such amendment by University and
Company and shall not be unreasonably withheld or delayed. 
 9.6    Effect of Termination. Upon termination of this
Agreement, the Licensed Rights granted (including any and all rights granted under the Licensed Rights to Sublicensees including Permitted Sublicensees) will terminate. However, no end-user rights shall
terminate as a result of termination of this Agreement. Company’s obligations that have accrued prior to the effective date of termination or expiration of this Agreement (including but not limited to the obligations under Article 6
“Payments, Reimbursements, Reports, and Records” will survive termination of this Agreement. Sublicenses will terminate unless converted into a direct license with University pursuant to Section 9.8 “Sublicenses After
Termination”. Notwithstanding any such termination of this Agreement, subject to being in compliance with Article 6 of this Agreement at the time of termination, and subject to ongoing compliance with obligations under Article 6 and Article 10
“Release, Indemnification, and Insurance”, Company and any Sublicensees and Distributors may sell or otherwise dispose of existing inventory of Licensed Products for a period of [***] days after the effective date of termination of this
Agreement (“Sell-Off Period”), provided, however, that the terms of this Agreement shall apply to the Sell-Off Period as if this Agreement had not
terminated. Company will provide notification if Company, or any Sublicensees or Distributors, will be exercising their rights to continue selling inventory pursuant to the Sell-Off Period. 

9.7    Final Report to University. Within sixty (60) days after the end of the calendar quarter following either the
expiration or termination of either this Agreement or the Sell-Off Period, whichever is later, Company will submit a final Sales Report to University. Any payment obligations accrued prior to such termination
or expiration, including those incurred but not yet paid, will become due and payable at the same time as this final Sales Report is due to University. 

9.8    Sublicenses After Termination. At any time within [***] following termination of this Agreement, Sublicensee may
notify University pursuant to Section 13.10 “Notices” that it wishes to enter into a direct license with University in order to retain its rights to the Licensed Rights granted to it under its Sublicense (such [***] period following
receipt of notice of termination, the “Initial Notice Period”). Following University’s receipt of Sublicensee’s notice, University shall offer Sublicensee a license agreement the terms of which will be substantially
similar to the terms of this Agreement; provided, however, that the offered scope of the direct license, licensed territory, and duration of the license grant will be the same as (not merely substantially similar to) the scope of the license,
licensed territory and duration of the license granted under this Agreement (unless the rights granted by Company to Sublicensee were a subset of rights under this Agreement, in which case the scope of the direct license, licensed territory and
duration of the license will be the same as the corresponding terms granted by Company to such 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 16
















 CONFIDENTIAL 
  

 
Sublicensee). For the sake of clarity, the financial terms, including without limitation, the running royalty rate, will be identical to the corresponding financial terms set forth in this
Agreement. Notwithstanding the foregoing, each Sublicensee’s right to enter into such direct license will be conditioned upon: 

9.8.1    Written Notification to University. Such Sublicensee informing University in writing, pursuant to
Section 13.10 “Notices”, that it wishes to enter into such direct license with University, within the Initial Notice Period; 

9.8.2    Sublicensee in Good Standing. Such Sublicensee being in good standing with Company under its
Sublicense such that Sublicensee is not in material breach of the Sublicense; 
 9.8.3    Valid Sublicense.
Such Sublicense having been validly entered into by Company and Sublicensee pursuant to the terms of Section 2.3 “Sublicense Rights”; 

9.8.4    Sublicensee Certification that Conditions are Satisfied. Such Sublicensee using reasonable efforts to
certify or otherwise demonstrate that the conditions set forth in Subsections 9.8.1 “Written Notification to University”, 9.8.2 “Sublicensee In Good Standing”, and 9.8.3 “Valid Sublicense” have been met within [***] of
expiration of the Initial Notice Period (or within such longer period of time as University agrees is reasonable under the circumstances, based on the nature and extent of any documentation reasonably requested by University); and 

9.8.5    Time Limitations. Unless mutually agreed by the Parties in writing, execution of a direct license
with Sublicensee will be completed not later than [***] from the end of the Initial Notice Period. 
 Except as set forth in Subsection 9.8.5
“Time Limitations”, University may, at its sole discretion, waive any of the requirements in Subsections 9.8.1 through 9.8.4. If all of the conditions set forth in this Section 9.8 “Sublicenses After Termination” are met,
then Sublicensee will be granted such direct license by University. If any condition set forth in this Section 9.8 “Sublicenses After Termination” is not met, then after expiration of any time period granted to Sublicensee with
respect to meeting such condition (for example and to the extent applicable, the Initial Notice Period and/or the periods described in Subsections 9.8.4 “Sublicensee Certification that Conditions are Satisfied” and 9.8.5 “Time
Limitations”), Sublicensee will not practice Licensed Rights except as provided for in Section 9.6 “Effect of Termination” and University will be free to license or not license Licensed Rights to such Sublicensee according to
University’s sole discretion. 
 10.    RELEASE, INDEMNIFICATION, AND
INSURANCE 
 10.1    Company’s Release. Company hereby releases University and its
regents, officers, employees, and agents forever from any and all suits, actions, claims, liabilities, demands, damages, losses, or expenses (including reasonable attorneys’ and investigative expenses) relating to or arising out of (a) the
manufacture, use, lease, sale, or other disposition of a Licensed Product; or (b) the assigning or sublicensing of Company’s rights under this Agreement. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 17
















 CONFIDENTIAL 
  

 10.2    Indemnification. Company will indemnify, defend, and hold harmless
University and its regents, officers, employees, and agents (each, an “Indemnitee”) from all Third Party suits, actions, claims, liabilities, demands, damages, losses, or expenses (including reasonable attorneys’ and
investigative expenses), based on University’s role in developing or licensing Licensed Rights and relating to or arising out of Company’s or Sublicensees’ exercise of any rights with respect to Licensed Products, including, without
limitation, personal injury, property damage, breach of contract and warranty and products-liability claims relating to a Licensed Product and claims brought by a Sublicensee (each, a “Claim”), provided that the Company will not
have obligations to the extent resulting from the University’s or gross negligence or willful misconduct. In the event of a Claim, the Indemnitee against whom a Claim is brought will: (a) give Company written notice of the Claim within a
reasonable period of time after such Indemnitee receives notice thereof along with sufficient information for Company to identify the Claim; and (b) cooperate and provide such assistance (including, without limitation, testimony and access to
documentation within the possession or control of such Indemnitee) as Company may reasonably request in connection with Company’s defense, settlement and satisfaction of the Claim. Company will pay or reimburse all costs and expenses reasonably
incurred by such Indemnitee to provide any such cooperation and assistance. Any settlement that would admit liability on the part of University or that would involve any relief other than the payment of monetary damages will be subject to the
approval of University, such approval not to be unreasonably withheld. HHMI, and its trustees, officers, employees, and agents (collectively, “HHMI Indemnitees”), will be indemnified, defended by counsel acceptable to HHMI, and held
harmless by Company from and against any claim, liability, cost, expense, damage, deficiency, loss, or obligation, of any kind or nature (including, without limitation, reasonable attorneys’ fees and other costs and expenses of defense)
(collectively, “HHMI Claims”), based upon, arising out of, or otherwise relating to this Agreement or any Sublicense, including without limitation any cause of action relating to product liability. The previous sentence will not
apply to any HHMI Claim that is determined with finality by a court of competent jurisdiction to result solely from the gross negligence or willful misconduct of an HHMI Indemnitee. Notwithstanding any other provision of this Agreement,
Company’s obligation to defend, indemnify and hold harmless the HHMI Indemnitees under this paragraph will not be subject to any limitation or exclusion of liability or damages or otherwise limited in any way. 

10.3    Company’s Insurance. 

10.3.1    General Insurance Requirement. Throughout the term of this Agreement, or during such period as the
Parties will agree in writing, Company will maintain full force and effect commercial general liability (CGL) insurance and product liability insurance, with single claim limits at an amount customary to Company’s business for activities and/or
products of a similar nature. Such insurance policy will include coverage for claims that may be asserted by University or HHMI against Company under Section 10.2 “Indemnification”. Such insurance policy will name the Board of Regents
of the University of Washington and HHMI as an additional insured and will require the insurer to deliver written notice to University at the address set forth in Section 13.10 “Notices”, at least thirty (30) days prior to the
termination of the policy. Company will deliver to University a copy of the certificate of insurance for such policy. 

10.3.2    Clinical Trial Liability Insurance. Within thirty (30) days prior to the initiation of human
clinical trials with respect to Licensed Product(s), Company will provide to University certificates evidencing the existence and amount of clinical trials liability insurance. Company will issue 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 18
















 CONFIDENTIAL 
  

 
irrevocable instructions to its insurance agent and to the issuing insurance company to notify University of any discontinuance or lapse of such insurance not less than thirty (30) days
prior to the time that any such discontinuance is due to become effective. Company will provide University a copy of such instructions upon their transmittal to the insurance agent and issuing insurance company. Company will further provide
University, at least annually, proof of continued coverage. 
 11.    WARRANTIES 

11.1    Authority. Each Party represents and warrants to the other Party that it has full power and authority to execute,
deliver, and perform this Agreement, and that no other proceedings by such Party are necessary to authorize the Party’s execution or delivery of this Agreement. 

11.2    Documents. University represents and warrants that: all University personnel, including employees, students,
consultants and contractors, who University is aware as of Effective Date have contributed to the Licensed Patents as of Effective Date have either (a) been party to a for-hire relationship with
University that affords University sufficient ownership of all Licensed Patents to provide this license of University’s rights to Company, or (b) executed assignment documents in favor of University as prescribed either by University
policies or by agreement with HHMI to provide University sufficient ownership of the Licensed Patents to provide this license of University’s rights to Company. 

11.3     No Known Infringement. As of the Effective Date, to the best of University’s CoMotion office’s knowledge,
(a) no claim has been made or is threatened charging University with infringement of, or claiming that the Licensed Rights infringe any Third Party rights; and (b) no proceedings have been instituted, or are pending or threatened, which
challenge the University’s rights in respect to the Licensed Patents or other Licensed Rights. 
 11.4    Disclaimer.
EXCEPT FOR THE EXPRESS WARRANTIES SET FORTH IN SECTIONS 11.1 “AUTHORITY”, 11.2 “DOCUMENTS”, AND 11.3 “NO KNOWN INFRINGEMENT” UNIVERSITY DISCLAIMS AND EXCLUDES ALL WARRANTIES, EXPRESS AND IMPLIED, CONCERNING
EACH LICENSED RIGHT AND EACH LICENSED PRODUCT, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF NON-INFRINGEMENT AND THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University
innovation has been developed as part of research conducted at University. University innovation is experimental in nature and is made available “AS IS,” without obligation by University to provide accompanying services or support except
as specified in this Agreement. The entire risk as to the quality and performance of University innovation is with Company. 

11.5    Intellectual Property Disclaimers. University expressly disclaims any warranties concerning and makes no
representations: (a) that the Licensed Patent(s) will be approved or will issue; (b) concerning the validity or scope of any Licensed Right; or (c) that the practice of Licensed Rights, or the manufacture, use, sale, lease or other
disposition of a Licensed Product will not infringe or violate a Third Party’s patent, copyright, or other intellectual property right. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 19
















 CONFIDENTIAL 
  

 12.    DAMAGES 

12.1    Remedy Limitation. EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, (A) IN NO EVENT WILL
UNIVERSITY BE LIABLE FOR PERSONAL INJURY OR PROPERTY DAMAGES ARISING IN CONNECTION WITH THE ACTIVITIES CONTEMPLATED IN THIS AGREEMENT AND (B) IN NO EVENT WILL EITHER PARTY BE LIABLE FOR LOST PROFITS, LOST BUSINESS
OPPORTUNITY, INVENTORY LOSS, WORK STOPPAGE, LOST DATA OR ANY OTHER RELIANCE OR EXPECTANCY, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY KIND. FOR THE AVOIDANCE OF DOUBT, IN NO EVENT WILL COMPANY BE LIABLE FOR PERSONAL INJURY OR
PROPERTY DAMAGES ARISING IN CONNECTION WITH THE ACTIVITIES OF ANY THIRD PARTY LICENSEE OF UNIVERSITY UNDER ANY AND ALL LICENSES GRANTED BY UNIVERSITY TO SUCH THIRD PARTY UNDER THE LICENSED PATENTS TO MAKE, HAVE MADE ON SUCH THIRD
PARTY’S BEHALF, USE, OFFER TO SELL, SELL, OFFER TO LEASE OR LEASE, IMPORT, OR OTHERWISE OFFER TO DISPOSE OF LICENSED PRODUCTS IN THE TERRITORY IN THE CV FIELD OF USE.  

12.2    Damage Cap. IN NO EVENT WILL UNIVERSITY’S TOTAL LIABILITY FOR THE BREACH OR NONPERFORMANCE OF
THIS AGREEMENT EXCEED [***] OF PAYMENTS PAID TO UNIVERSITY UNDER ARTICLE 6 “PAYMENTS, REIMBURSEMENTS, REPORTS, AND RECORDS”. THIS LIMITATION WILL APPLY TO CONTRACT, TORT, AND ANY
OTHER CLAIM OF WHATEVER NATURE. 
 13.    GENERAL PROVISIONS 

13.1    Amendment and Waiver. This Agreement may be amended from time to time only by a written instrument signed by the
Parties. No term or provision of this Agreement will be waived, and no breach excused, unless such waiver or consent is in writing and signed by the Party claimed to have waived or consented. No waiver of a breach will be deemed to be a waiver of a
different or subsequent breach. 
 13.2    Assignment. The rights and licenses granted by University in this Agreement are
personal to Company and Company will not assign its interest or delegate its duties under this Agreement without the written consent of University, which consent will not to be unreasonably withheld or delayed; any such assignment or delegation made
without written consent of University will not release Company from its obligations under this Agreement. Notwithstanding the foregoing, Company, without the prior approval of University, may assign all, but no less than all, of its rights and
delegate all, but no less than all, of its duties under this Agreement to a Third Party provided that: (a) the assignment is made to such Third Party as a part of and in connection with an Acquisition, (b) Company obtains from such Third
Party written agreement to honor all obligations under this Agreement accrued by Company before Acquisition and all obligations under this Agreement to accrue by such Third Party assignee after Acquisition, and (c) Company provides written
notice to University of the Acquisition, together with a substitution of parties document or copy of the assignment confirming compliance with (b) above, no later than thirty (30) days after the close of the Acquisition. Any assignment
made in violation of this Section 13.2 is void and will constitute an act of breach that requires remedy under Section 9.2 “Termination by University”. This Agreement will inure to the benefit of Company and University and their
respective permitted assignees and trustees. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 20
















 CONFIDENTIAL 
  

 13.3    Confidentiality. 

13.3.1    Form of Transfer. Confidential Information may be conveyed in tangible or intangible form.
Disclosing Party must clearly mark its Confidential Information “confidential”. If disclosing Party communicates Confidential Information in non-written form, it will reduce such communications to
writing, clearly mark it “confidential”, and provide a copy to receiving Party within thirty (30) days of original communication at the address in Section 13.10 “Notices”. Any business information delivered by Company
as required under this Agreement shall be deemed marked “confidential”, whether or not such confidential marking appears. 

13.3.2    No Unauthorized Disclosure of Confidential Information. Beginning on the Effective Date and
continuing throughout the term of this Agreement and thereafter for a period of [***], receiving Party will not disclose or otherwise make known or available to any Third Party any disclosing Party Confidential Information, without the express prior
written consent of disclosing Party. Notwithstanding the foregoing, receiving Party will be permitted to disclose Confidential Information of disclosing Party to (i) actual or potential investors, lenders, consultants, advisors, collaborators,
Sublicensees, or development partners, which disclosure will be made under conditions of confidentiality and limited use and (ii) its attorney or agent as reasonably required and (iii) to employees and trustees of HHMI who have a need to
know. In no event will receiving Party incorporate or otherwise use disclosing Party’s Confidential Information in connection with any patent application filed by or on behalf of receiving Party. Receiving Party will restrict the use of
disclosing Party’s Confidential Information to uses exclusively in accordance with the terms of this Agreement. Receiving Party will use reasonable procedures to safeguard disclosing Party’s Confidential Information. In the case where
Company is the receiving Party, Company’s confidentiality obligations will also apply equally to Sublicensees. 

13.3.3    Access to University Information. University is an agency of the state of Washington and is subject
to the Washington Public Records Act, RCW 42.56 et seq., (“Act”), and no obligation assumed by University under this Agreement will be deemed to be inconsistent with University’s obligations as defined under the Act and as
interpreted by University in its sole discretion. If University receives a request for public records under the Act for documents containing Company Confidential Information, and if University concludes that the documents are not otherwise exempt
from public disclosure, University will provide Company notice of the request before releasing such documents. Such notice will be provided in a timely manner to afford Company sufficient time to review such documents and/or seek a protective order,
at Company’s expense utilizing the procedures described in RCW 42.56.540. University will have no other obligation to protect Company Confidential Information from disclosure in response to a request for public records. 

13.3.4    Disclosure as Required by Law. Either Party will have the right to disclose the other Party’s
Confidential Information as required by law or valid court order, provided that such Party will inform the Party who owns such Confidential Information prior to such disclosure, will cooperate with the owner Party’s efforts to limit or avoid
disclosure, and will limit the scope and recipient of disclosure to that required by such law or court order. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 21
















 CONFIDENTIAL 
  

 13.4    Escalation; Dispute Resolution. If (i) Company disputes that a
default has occurred as contemplated in Section 9.2 “Termination by University”, or that a default has not been cured, or (ii) Company wishes to dispute termination of this Agreement resulting from a failed renegotiation of a new
Performance Milestone as contemplated under Section 5.2 “Renegotiation of Performance Milestones”, or (iii) Company disputes in good faith any amounts that are owed to University under this Agreement, and a late fee for such
disputed amount has been charged to Company under Section 6.3 “Late Payments”, then Company may provide University with a written dispute notice (“Dispute Notice”). In the case of (i) and (ii) above such Dispute
Notice must be received by University prior to expiration of the 60-day cure period referenced in Section 9.2 “Termination by University”, stating the basis of Company’s disagreement with
respect to such default or cure. In the case of (iii) above such Dispute Notice must be received by University within thirty (30) days of being charged a late fee for such disputed amount. If Company disputes that a default has occurred as
contemplated in Section 9.3 “Events of Default”, then Company may provide University with a Dispute Notice within thirty (30) days of University sending the notice of termination referenced in Section 9.3 “Events of
Default”. Upon receipt of a Dispute Notice, University’s right to terminate this Agreement or demand payment of late fees will be suspended and all rights under this Agreement will continue unaffected provided the dispute resolution
process in this Section 13.4 “Escalation; Dispute Resolution” is being exercised. Any dispute will first be escalated to Company’s Chief Executive Officer or to a representative from Company’s Board of Directors, and to
University’s Vice President for Innovation Strategy, representatives of which will be instructed to work in good faith to attempt to reach a mutually acceptable resolution of the dispute that would avoid termination of this Agreement. If the
representatives are unable to reach such resolution of the dispute within thirty (30) days of delivery of the Dispute Notice, an independent, neutral mediator acceptable to both Parties (acting reasonably) will be appointed. The Parties will
submit their dispute to mediation according to such parameters as they may mutually agree in writing. The Parties agree to discuss their differences in good faith and to attempt in good faith, with facilitation by the mediator, to reach an amicable
resolution of the dispute within thirty (30) days after the mediator’s appointment. If the Parties are not able to agree on resolution of the dispute within such period, or within ninety (90) days of the Dispute Notice, whichever is
earlier, including agreeing on a new Performance Milestone pursuant to Section 5.2 “Renegotiation of Performance Milestones” if that is the subject of the dispute, then the dispute resolution process of this Section 13.4
“Escalation; Dispute Resolution” will be complete and either Party may pursue any other action that is legally available to it. Notwithstanding the foregoing, no dispute affecting the rights or property of HHMI shall be subject to the
dispute resolutions provisions set forth above. 
 13.5    Consent and Approvals. Except as otherwise expressly provided in
this Agreement, all consents or approvals required under the terms of this Agreement must be in writing and will not be unreasonably withheld or delayed. 

13.6    Construction. The headings preceding and labeling the sections of this Agreement are for the purpose of
identification only and will not in any event be employed or used for the purpose of construction or interpretation of any portion of this Agreement. As used herein and where necessary, the singular includes the plural and vice versa, and masculine,
feminine, and neuter expressions are interchangeable, and the word “including” shall mean “including, without limitation.” 

13.7    Enforceability. If a court of competent jurisdiction adjudges a provision of this Agreement unenforceable, invalid,
or void, such determination will not impair the enforceability of any of the 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 22
















 CONFIDENTIAL 
  

 
remaining provisions hereof and the provisions will remain in full force and effect. 

13.8    Third-Party Beneficiaries. Except as identified in Section 13.22 “Third Party Beneficiary”, no
provision of this Agreement, express or implied, confers upon any person other than the Parties to this Agreement, HHMI and Sublicensees (Sublicensees solely for purposes of enforcing Sections 9.8 “Sublicenses After Termination” and 13.22)
any rights, remedies, obligations, or liabilities hereunder. No Sublicensee will have a right to enforce or seek damages under this Agreement other than as set forth in Section 13.22. The Parties agree that no amendment or modification to
Section 9.8 or Section 13.22 shall apply to a Sublicensee without the prior written consent of that Sublicensee, if such amendment occurs after the date of execution of the applicable Sublicense. 

13.9    Language. Unless otherwise expressly provided in this Agreement, all notices, reports, and other documents and
instruments that a Party elects or is required by the terms of this Agreement to deliver to the other Party will be in English. 

13.10    Notices. All notices, requests, and other communications that a Party is required or elects to deliver will be in
writing and will be delivered personally, or by facsimile or electronic mail (provided such delivery is confirmed), or by a recognized overnight courier service or by United States mail, first-class, certified or registered, postage prepaid, return
receipt requested, to the other Party at its address set forth below or to another address as a Party may designate by notice given under this Section 13.10: 
  

			
	If to University:	  	 UW CoMotion
 ATTN: Director, Innovation Development

4545 Roosevelt Way NE, Suite 400
 Seattle, WA 98105-4721

Facsimile No.: 206-685-4767

		
	If to Company:	  	 Icosavax, Inc.
 ATTN: Adam Simpson

1616 Eastlake Avenue E., Suite 208
 Seattle, WA 98102


 13.11    Proprietary Markings. To the extent commercially feasible, Company will mark all
material forms of Licensed Products or packaging pertaining thereto made and sold by Company in the United States with patent marking conforming to 35 U.S.C. §287(a), as amended from time to time. All Licensed Product(s) shipped to or sold in
other countries will be marked in such a manner as to provide notice to potential infringers pursuant to the patent law and practice of the country of manufacture or sale. 

13.12    Use of University’s Name and Trademarks or the Names of University Faculty, Staff, or Students.
No provision of this Agreement grants Company or Sublicensee any right or license to use the name or trademarks of University or the names or identities of any member of the faculty, staff, or student body of University. Except as provided herein,
Company will not use, and will not permit a Sublicensee to use, any such trademarks, names, or identities without University’s and, as the case may be, such member’s 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 23
















 CONFIDENTIAL 
  

 
prior written approval. Notwithstanding the foregoing, Company and University may provide factual information regarding the existence of this Agreement. Company acknowledges that under HHMI
policy, Company may not use the name of HHMI or of any HHMI employee (including Dr. Baker) in a manner that reasonably could constitute an endorsement of a commercial product or service; but that use for other purposes, even if commercially
motivated, is permitted provided that (1) the use is limited to accurately reporting factual events or occurrences, and (2) any reference to the name of HHMI or any HHMI employees in press releases or similar materials intended for public
release is approved by HHMI in advance. 
 13.13    Publicity. In accordance with Section 13.12, University will have
the right to report in its customary publications and presentations that University and Company have entered into a license agreement for the technology covered by the Licensed Rights and University may use Company logos in such publications and
presentations provided that University does not modify Company’s logos and does not through such use imply any endorsement by Company of University. The Parties will cooperate with one another to review and respond to any press release or
similar communication proposed by the other Party regarding the non-confidential subject matter of this Agreement. The specific content and timing of such press releases or similar communication is subject to
mutual agreement by the Parties, which will not be unreasonably withheld. 
 13.14    Relationship of Parties. In entering
into, and performing their duties under, this Agreement, the Parties are acting as independent contractors and independent employers. No provision of this Agreement will create or be construed as creating a partnership, joint venture, or agency
relationship between the Parties. No Party will have the authority to act for or bind the other Party in any respect. 

13.15    Relationship with Principal Investigator(s). Company acknowledges that Principal Investigator is employed by
University and has certain pre-existing obligations to University, including obligations with respect to disclosure and ownership of intellectual property and obligations arising from sponsored research
agreements between University and Third Parties. Accordingly, Company agrees that to the extent that any consulting agreement between Company and Principal Investigator is inconsistent with any of Principal Investigator’s obligations to
University, including the reporting of all inventions developed while employed by University (regardless of where arising) and including contractual obligations arising under any sponsored research agreements between University and Third Parties,
then Principal Investigator’s obligations to University will prevail and to such extent any inconsistent provisions of such consulting agreement will be deemed inapplicable and unenforceable. 

13.16    Security Interest. In no event will Company grant, or permit any person to assert or perfect, a security interest in
the Licensed Rights; however, Company may grant or permit a security interest in the Company’s rights under this Agreement. 

13.17    Survival. The obligations specified in Article 6 “Payments, Reimbursements, Reports, and Records” will
survive termination of this Agreement provided Reports will not be required for any period in which there are no Net Sales other than the final report due under Section 9.7 “Final Report to University”. Article 1
“Definitions” and the obligations and rights set forth in Section 2.8 “HHMI Research Use Rights”, Section 5.3 “Commercialization Reports” (as applicable to any Sell-Off
Period), Article 9 “Termination”, Article 10 “Release, Indemnification, and Insurance”, Article 11 “Warranties”, Article 12 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 24
















 CONFIDENTIAL 
  

 
“Damages”, Section 13.3 “Confidentiality”, Section 13.4 “Escalation; Dispute Resolution”, but only with respect to any disputes arising before the
effective date of termination or expiration), Section 13.17 “Survival”, Section 13.19 “Applicable Law”, Section 13.20 “Forum Selection”, Section 13.21 “Entire Agreement”, and
Section 13.22 “Third-Party Beneficiary” will survive the termination or expiration of this Agreement. 

13.18    Collection Costs and Attorneys’ Fees. If a Party fails to perform an obligation or otherwise
breaches one or more of the terms of this Agreement, the other Party may recover from the non-performing breaching Party all its costs (including actual attorneys’ and investigative fees) to enforce the
terms of this Agreement. 
 13.19    Applicable Law. The internal laws of the state of Washington will govern the validity,
construction, and enforceability of this Agreement, without giving effect to the conflict of laws principles thereof. 

13.20    Forum Selection. Any suit, claim, or other action to enforce the terms of this Agreement will be brought exclusively
in the state and federal courts of King County, Washington. Company hereby submits to the jurisdiction of that court and waives any objections it may have to that court asserting jurisdiction over Company or its assets and property. 

13.21    Entire Agreement. Except for the Other License Agreement, this Agreement (including all attachments, exhibits, and
amendments) is the final and complete understanding between the Parties concerning licensing of the Licensed Rights and this Agreement supersedes any and all prior or contemporaneous negotiations, representations, and agreements, whether written or
oral, concerning the Licensed Rights in the CV Field of Use, including the MTA. Notwithstanding anything to the contrary in this Agreement, nothing in this Agreement will limit any of the rights granted by University to Company pursuant to the Other
License Agreement. Confidential Information disclosed under this Agreement will be governed by the terms of this Agreement. This Agreement may not be modified in any manner, except by written agreement signed by an authorized representative
of both Parties. 
 13.22    Third Party Beneficiary. 

13.22.1    HHMI is not a party to this Agreement and has no liability to any licensee, sublicensee, or user of
anything covered by this Agreement, but HHMI is an intended third-party beneficiary of this Agreement and certain of its provisions are for the benefit of HHMI and are enforceable by HHMI in its own name. 

13.22.2    Notwithstanding anything to the contrary in this Agreement, each Sublicensee is an intended third party
beneficiary of this Agreement, but solely for purposes of enforcing Section 9.8 “Sublicenses After Termination” in its own name. 

13.23    Counterparts. This Agreement may be executed in counterparts, each of which (including signature pages) will be
deemed an original, but all of which together will constitute one and the same instrument. A facsimile, scanned, or photocopied signature (and any signature duplicated in another similar manner) identical to the original will be considered an
original signature. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 25
















 CONFIDENTIAL 
  

 IN WITNESS WHEREOF, the Parties have caused this Agreement to be duly executed by their
respective authorized representatives. 
  

									
	University of Washington	  	 	 	Icosavax, Inc.
					
	By:	  	 /s/ Dennis Hanson
	  		 	By:	 	 /s/ Adam Simpson

	Name:	  	Dennis A. Hanson	  		 	Name:	 	Adam K. Simpson
	Title:	  	Associate Director, Innovation Development	  		 	Title:	 	Chief Executive Officer
	Date:	  	7/2/2020	  		 	Date:	 	7/2/2020


  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 26
















 CONFIDENTIAL 
  

 Exhibit A 

License Schedule 
 A1.    Licensed
Rights: 
 A1.1    Licensed Patents: [***] 
  

											
	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]


 ] 

A2.    Performance Milestones (Section 5.1 “Performance Milestones”): Subject to any extension pursuant to Section 5.2
“Renegotiation of Performance Milestones” of the Agreement, and Company’s right to renegotiation of Performance Milestones and/or Performance Milestone Date(s), Company will perform, or shall cause to happen or be performed, the
following Performance Milestones: 
  

			
	 	  	 Performance Milestone and Performance Milestone Date
in the CV Field
of Use

	A2.1.1 Performance Milestone 1	  	[***]
		
	A2.1.2 Performance Milestone 2	  	[***]
		
	A2.1.3 Performance Milestone 3	  	[***]
		
	A2.1.4 Performance Milestone 4	  	[***]
		
	A2.1.5 Performance Milestone 5	  	[***]


  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 27
















 CONFIDENTIAL 
  


			
	A2.1.6 Performance Milestone 6	  	[***]
		
	A2.1.7 Performance Milestone 7	  	[***]

 A3.    Payments (Section 6.1): 

A3.1    Running Royalty Payments. Company will pay to University within [***] after the last day of each
calendar quarter during the term of this Agreement after the Option Effective Date an amount equal to [***] during such quarter as a running royalty payment. 

A3.1.1    Stacking or Third Party Royalty. If a Licensed Party is required to pay royalties to a Third Party
based on such Licensed Party’s manufacture, use, offer for sale, sale or import of Licensed Product, subject to one or more patents of such Third Party, then the royalty Company pays to University may be reduced [***] of the royalty actually
paid to the Third Party; provided that [***] of Licensed Product, and provided that the royalty amount paid to the University shall not fall below [***] of Net Sales. 

A3.1.2    Only One Royalty. Company will not be required to pay royalties on Net Sales of any Licensed Product
under this Agreement if Company is required to pay royalties on such Net Sales under the Other License Agreement. By way of example, and without limitation, if Net Sales include sales of a product that includes a product that is subject to the Other
License Agreement and a Licensed Product that is subject to this Agreement, then the royalty rate with respect to such combination product will be [***], subject to any modifications for Third Party royalties as set forth in Sections A3.2.1 (of this
Agreement and the Other License Agreement). 
 A 3.2     Sublicense Consideration. Within sixty (60) days of the end
of each calendar quarter during the term of this Agreement, Company will pay to University [***] of any Sublicense Consideration received by Company during such calendar quarter unless reduced by achievement of Performance Milestones by Company or
its Sublicensees prior to execution of the particular Sublicense in accordance with the schedule below. Determination of the relevant Performance Milestone having been achieved for the purposes of determining the Sublicense Consideration percentage
shall be based on the most advanced Licensed Product candidate then in development for which Sublicense Consideration was received. A further reduction of the percentage of Sublicense Consideration payable to University under this Agreement will be
negotiated in good faith between the Parties where, in addition to the Sublicense of any rights granted to Company hereunder, Company or its Sublicensee also grants a Sublicensee a license or sublicense under a Third Party’s intellectual
property rights that are or would be infringed by Licensed Product(s) (treating pending patent applications as if they were issued patents), but only to the extent that the total aggregate consideration for such combined license is treated as
Sublicense Consideration. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 28
















 CONFIDENTIAL 
  


					
	 	  	 Milestone Has Been Achieved at the Date of

Execution of the Sublicense
	  	 Sublicense

Consideration
 Percentage

	A3.2.1	  	Performance Milestone 1	  	[***]
			
	A3.2.2	  	Performance Milestone 2	  	[***]
			
	A3.2.3	  	Performance Milestone 3	  	[***]
			
	A3.2.4	  	Performance Milestone 4	  	[***]
			
	A3.2.5	  	Performance Milestone 5	  	[***]
			
	A3.2.6	  	Performance Milestone 6	  	[***]
			
	A3.2.7	  	Performance Milestone 7	  	[***]

 A3.3    Patent Expense Payment. Commencing on the Effective Date, Company
will pay, or reimburse University for paying, Patent Expenses on Licensed Patents with [***] incurred on or after the Effective Date within thirty (30) days of its receipt of University’s invoice for such Patent Expenses. If University
licenses the Licensed Patents with [***] to Third Party(ies), Company will pay a prorated portion based on the number of licenses of such Licensed Patents in the CV Field of Use that UW has entered into during such period (e.g., if University enters
into one such license in addition to this Agreement, then Company will only be responsible for one-half of such Patent Expenses incurred during such period, and if University enters into two such licenses in
addition to this Agreement, then Company will only be responsible for one-third of such Patent Expenses incurred during such period). Company has obligations to reimburse University under Other License
Agreement for all of the other non-[***] Licensed Patents. If Other License Agreement terminates, the Parties agree to update this section A3.3 by written amendment to include reimbursement obligations for all
of the Licensed Patents. University reserves the right to request advance payments for certain Patent Expenses, at University’s discretion. 

A3.3.1    Notwithstanding Sections 4.2 and 4.3 of this Agreement, if at any time Company is not fully reimbursing
University for Patent Expenses, or fails to provide advance payment when requested, University shall make patent filing, prosecution, and maintenance decisions, including choosing in which countries to prosecute patents, in its sole discretion and
Company shall have no rights to provide instruction or to take over patent prosecution. University shall reasonably consider input provided by Company, but have no obligation to act on such input. 

  

			
	 Icosavax, Inc. / University of Washington
 License and Exclusive
Option Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 29
















 CONFIDENTIAL 
  

 Exhibit B 

[***] 

  

			
	 Icosavax, Inc. / University of Washington
 Exclusive License
Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 30 of 32
















 CONFIDENTIAL 
  

 Exhibit C 

Developing Countries 
 [***] 

  

			
	 Icosavax, Inc. / University of Washington
 Exclusive License
Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 31 of 32
















 CONFIDENTIAL 
  

 Exhibit D 

BMGF Agreements 

  

			
	 Icosavax, Inc. / University of Washington
 Exclusive License
Agreement
 UW CoMotion Ref. [***]
	  	  
 Page 32 of 32
















 CONFIDENTIAL 

 

 Amendment No. 1 to 

License and Exclusive Option Agreement [***] 

This amendment (“Amendment No. 1”) to the License and Exclusive Option Agreement [***] (“Agreement”; with an
effective date of July 2, 2020), by and between the University of Washington, a public institution of higher education and an agency of the state of Washington (“University”), and Icosavax, Inc., a for profit corporation under the
laws of Delaware (“Company”) (collectively, the “Parties”), is entered into by and between the Parties, effective as of August 11, 2020 (“Amendment No. 1 Effective Date”). 

WHEREAS, the Parties now wish to amend the Agreement, effective as of the Amendment No. 1 Effective Date, to amend (i) the list of
Licensed Patents, (ii) language on patent expense payment, (iii) definition of Option Territory, and (iv) Performance Milestones Dates; 

WHEREFORE the Parties, intending to be legally bound, acknowledge and agree as follows: 

1.    The rights and obligations of the Parties shall be governed by the terms and conditions of the 

Agreement, as amended by this Amendment No. 1. 

2.    The table in Section A1.1 of Exhibit A (Licensed Patents) is amended to include the below: 

[ 
  

											
	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]

	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]
	  	 [***]


 ] 

3.    Section A3.3 of Exhibit A (Patent Expense Payment) is amended and restated in its entirety as below: 

Company will pay, or reimburse University for paying, all Patent Expenses on a pro rata basis with any other licensees of Licensed Patents,
incurred before, on or after the Effective Date, within thirty (30) days of its receipt of University’s invoice for such Patent Expenses. University reserves the right to request advance payments for certain Patent Expenses, at
University’s discretion. 
 4.    The definition for Option Territory is amended and restated in its entirety as
below: 
 “Option Territory” means the United States, Canada, Mexico, and the member states of the European Patent Organisation
(including without limitation Switzerland and United Kingdom of Great Britain and Northern Ireland), and their respective territories and possessions. 













 CONFIDENTIAL 

 

 5.    The table in Section A2 of Exhibit A (Performance Milestones) is
amended and restated in its entirety as below: 
  

			
	 	  	 Performance Milestone and Performance Milestone Date
in the CV Field
of Use

	A2.1.1 Performance Milestone 1	  	[***]
		
	A2.1.2 Performance Milestone 2	  	[***]
		
	A2.1.3 Performance Milestone 3	  	[***]
		
	A2.1.4 Performance Milestone 4	  	[***]
		
	A2.1.5 Performance Milestone 5	  	[***]
		
	A2.1.6 Performance Milestone 6	  	[***]
		
	A2.1.7 Performance Milestone 7	  	[***]














 CONFIDENTIAL 

 


	 	6.	 All other terms and conditions of the Agreement shall remain in full force and effect. 



 

	 	7.	 This Amendment No. 1 may be executed by facsimile and in identical counterparts, each of which will be
deemed an original, but all of which together will constitute one and the same instrument. A facsimile, scanned, or photocopied signature (and any signature duplicated in another similar manner) identical to the original will be considered an
original signature. 


 IN WITNESS WHEREOF, the Parties have executed this Amendment No. 1 effective as of the
Amendment No. 1 Effective Date. 
  

									
	UNIVERSITY OF WASHINGTON	  	 	 	Icosavax, Inc.
					
	By:	  	 /s/ Dennis Hanson
	  		 	By:	 	 /s/ Adam Simpson

	Name:	  	Dennis Hanson	  		 	Name:	 	Adam Simpson
	Title:	  	Associate Director, Innovation Development	  		 	Title:	 	Chief Executive Officer
	Date:	  	12/2/2020	  		 	Date:	 	12/2/2020













 CONFIDENTIAL 

Amendment No. 2 to 

License and Exclusive Option Agreement [***] 

This amendment (“Amendment No. 2”) to the License and Exclusive Option Agreement [***] (“Agreement”; with an
effective date of July 2, 2020), by and between the University of Washington, a public institution of higher education and an agency of the state of Washington (“University”), and Icosavax, Inc., a for profit corporation under the
laws of Delaware (“Company”) (collectively, the “Parties”), is entered into by and between the Parties, effective as of April 2, 2021 (“Amendment No. 2 Effective Date”). 

WHEREAS, the Parties now wish to amend the Agreement, effective as of the Amendment No. 2 Effective Date, to amend the list of Licensed
Patents to add a patent application co-owned by University and the Fred Hutchinson Cancer Research Center (“Fred Hutch”), and add Fred Hutch to certain sections of the Agreement; 

WHEREFORE the Parties, intending to be legally bound, acknowledge and agree as follows: 

1. The rights and obligations of the Parties shall be governed by the terms and conditions of the Agreement, as previously amended by Amendment
No. 1, and further amended by this Amendment No. 2. 
 2. The table in Section A1.1 of Exhibit A (Licensed Patents) is amended to
include the below: 
 [ 

											
	[***]	 	[***]	 	[***]	 	[***]	 	[***]	 	[***]
	[***]	 	[***]	 	[***]	 	[***]	 	[***]	 	[***]

 ] 

3. Sections A and B of the Background are amended and restated in its entirety as below: 

 

	 	A.	 Certain innovations relating to computationally designed two-component
icosahedral protein nanoparticles; two-component tetrahedral protein nanoparticles; and methods of multivalent antigen presentation on designed protein nanomaterials were made in the University laboratory of
Dr. David Baker, a faculty member in the Department of Biochemistry and an employee of the Howard Hughes Medical Institute (“HHMI”), with members of the Baker lab as co-inventors, including
Dr. Neil King, and solely by Dr. Neil King as “Principal Investigator” in his own lab while an employee and faculty member of University in the Department of Biochemistry. In addition certain innovations relating to novel
stabilized receptor binding domain immunogens for coronaviruses were collaboratively made in the University laboratory of Dr. Neil King and in the laboratory of [***] (who is an employee of HHMI) at the Fred Hutchinson Cancer Research Center
(“Fred Hutch”). 


  

	 	B.	 HHMI assigned its rights in such innovations for which Dr. Baker is an inventor (identified as [***],
[***] and [***] in Exhibit A “License Schedule” to this Agreement) to University, subject 















 CONFIDENTIAL 

 


	 	 
to the HHMI License (as defined herein). HHMI assigned its rights in those inventions listed in Exhibit A hereto for which HHMI employees, including [***], are inventors (Fred Hutch is [***]), to
Fred Hutch, subject to the HHMI License. University and Fred Hutch co-own intellectual property rights in certain inventions, as listed in Exhibit A “Start-Up
License Schedule” to this Agreement. University and Fred Hutch have executed an interinstitutional agreement, dated [***] and with University reference [***] (the “IIA”), that authorizes University to assume sole responsibility for
both the patent prosecution and licensing of co-owned patent applications. University thus co-owns and/or solely owns certain intellectual property rights in all
innovations as listed in Exhibit A “License Schedule” to this Agreement, and has the right to license to others certain rights to use and practice such intellectual property. University is willing to grant those rights so that such
innovations may be developed for use in the public interest. 


 4. Section 2.5 (Limitation of Rights) is amended and
restated in its entirety as below: 
 2.5    Limitation of Rights. No provision of this Agreement grants to Company, by
implication, estoppel or otherwise, any rights other than the rights expressly granted it in this Agreement under the Licensed Rights, including any license rights under any other University-owned or Fred Hutch-owned technology, copyright, know-how, patent applications, or patents, or any ownership rights in the Licensed Rights. 
 5.
Section 3.1 (University’s Rights) is amended and restated in its entirety as below: 
 3.1    University’s Rights.
University reserves all rights not expressly granted to Company under this Agreement. University retains for itself, Fred Hutch, and other not-for-profit research
institutions, an irrevocable, nonexclusive right to practice Licensed Rights for research, instructional or educational purposes. Expressly included, without limitation, within this University reservation of rights is the right to do the following
in connection with such research, instructional or educational purposes: (a) ) for the University, Fred Hutch, and other not-for-profit research institutions to use the
Licensed Rights in sponsored research or collaborative research with any Third Party, but not for any commercial purpose, and only to the extent that no such Third Party is granted any commercialization rights of any kind under the Licensed Rights
or to commercialize Licensed Products, (b) for the University and/or Fred Hutch to provide and grant use rights in materials covered by the Licensed Rights, provided that such material transfer agreements restrict the use of such materials to
research, teaching or other scholarly activities, and grant to the transferee no rights greater than those retained by the University and Fred Hutch, and preclude the transferee from further transferring such materials to any Third Party, and
(c) for the University, Fred Hutch, and other not-for-profit research institutions to publish any information included in the Licensed Rights or any other
information that may result from its research. 
 6. Section 10.1 (Company’s Release) is amended and restated in its entirety as
below: 
 10.1    Company’s Release. Company hereby releases University, Fred Hutch and their regents, officers, employees,
and agents forever from any and all suits, actions, claims, liabilities, demands, damages, losses, or expenses (including reasonable attorneys’ and investigative expenses) relating to or arising out of (a) the manufacture, use, lease,
sale, or other disposition of a Licensed Product; or (b) the assigning or sublicensing of Company’s rights under this Agreement. 













 CONFIDENTIAL 

 

 7. Section 10.2.1 (Indemnification) is amended and restated in its entirety as below

 10.2.1 Company will indemnify, defend, and hold harmless University, Fred Hutch and their regents, officers, employees, and agents (each, an
“Indemnitee”) from all Third Party suits, actions, claims, liabilities, demands, damages, losses, or expenses (including reasonable attorneys’ and investigative expenses), based on University’s and/or Fred Hutch’s role in
developing or licensing Licensed Rights and relating to or arising out of Company’s or Sublicensees’ exercise of any rights with respect to Licensed Products, including, without limitation, personal injury, property damage, breach of
contract and warranty and products-liability claims relating to a Licensed Product and claims brought by a Sublicensee (each, a “Claim”), provided that the Company will not have obligations to the extent resulting from the
University’s or Fred Hutch’s gross negligence or willful misconduct. In the event of a Claim, the Indemnitee against whom a Claim is brought will: (a) give Company written notice of the Claim within a reasonable period of time after
such Indemnitee receives notice thereof along with sufficient information for Company to identify the Claim; and (b) cooperate and provide such assistance (including, without limitation, testimony and access to documentation within the
possession or control of such Indemnitee) as Company may reasonably request in connection with Company’s defense, settlement and satisfaction of the Claim. Company will pay or reimburse all costs and expenses reasonably incurred by such
Indemnitee to provide any such cooperation and assistance. Any settlement that would admit liability on the part of University or Fred Hutch that would involve any relief other than the payment of monetary damages will be subject to the approval of
University, such approval not to be unreasonably withheld. 
 8. Section 10.3.1 (General Insurance Requirement) is amended and restated
in its entirety as below: 
 10.3.1    General Insurance Requirement. Throughout the term of this Agreement, or during such period
as the Parties will agree in writing, Company will maintain in full force and effect commercial general liability (CGL) insurance and product liability insurance, with single claim limits at an amount customary to Company’s business for
activities and/or products of a similar nature. Such insurance policy will include coverage for claims that may be asserted by University, Fred Hutch or HHMI against Company under Section 10.2 “Indemnification”. Such insurance policy
will name the Board of Regents of the University of Washington, Fred Hutch and HHMI as an additional insured and will require the insurer to deliver written notice to University at the address set forth in Section 13.10 “Notices”, at
least thirty (30) days prior to the termination of the policy. Company will deliver to University a copy of the certificate of insurance for such policy. 

9. Section 11.2 (Documents) is amended and restated in its entirety as below: 

11.2    Documents. University represents and warrants that: all University personnel, including employees, students, consultants and
contractors, who University is aware as of Effective Date have contributed to the Licensed Patents as of Effective Date have either (a) been party to a for-hire relationship with University that affords
University sufficient ownership of all Licensed Patents to provide this license of University’s rights to Company, or (b) executed assignment documents in favor of 













 CONFIDENTIAL 

 

 
University as prescribed either by University policies or by agreement with HHMI to provide University sufficient ownership of the Licensed Patents to provide this license of University’s
rights to Company. Furthermore in the IIA between University and Fred Hutch, Fred Hutch represents that its inventors who are employees of Fred Hutch are obligated to assign to Fred Hutch all of the inventors’ rights in the Licensed Patents;
and that Fred Hutch will use diligent efforts to cause its inventors to sign any additional papers as may be necessary to evidence such assignment. 

10. Section 11.3 (No Known Infringement) is amended and restated in its entirety as below: 

11.3     No Known Infringement. As of the Effective Date, to the best of University’s CoMotion office’s knowledge,
(a) no claim has been made or is threatened charging University or Fred Hutch with infringement of, or claiming that the Licensed Rights infringe any Third Party rights; and (b) no proceedings have been instituted, or are pending or
threatened, which challenge the University’s or Fred Hutch’s rights in respect to the Licensed Patents or other Licensed Rights. 

11. Section 11.4 (Disclaimer) is amended and restated in its entirety as below: 

11.4    Disclaimer. EXCEPT FOR THE EXPRESS WARRANTIES SET
FORTH IN SECTIONS 11.1 “AUTHORITY”, 11.2 “DOCUMENTS”, AND 11.3 “NO KNOWN INFRINGEMENT” UNIVERSITY (FOR ITSELF AND ON BEHALF OF FRED HUTCH) DISCLAIMS AND EXCLUDES ALL WARRANTIES, EXPRESS AND IMPLIED, CONCERNING EACH
LICENSED RIGHT AND EACH LICENSED PRODUCT, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF NON-INFRINGEMENT AND THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University/Fred
Hutch innovations have been developed as part of research conducted at University and Fred Hutch. University/Fred Hutch innovations are experimental in nature and is made available “AS IS,” without obligation by University or Fred Hutch to
provide accompanying services or support except as specified in this Agreement. The entire risk as to the quality and performance of University/Fred Hutch innovations is with Company. 

12. Section 11.5 (Intellectual Property Disclaimers) is amended and restated in its entirety as below: 

11.5    Intellectual Property Disclaimers. University (for itself and on behalf of Fred Hutch) expressly disclaims any warranties
concerning and makes no representations: (a) that the Licensed Patent(s) will be approved or will issue; (b) concerning the validity or scope of any Licensed Right; or (c) that the practice of Licensed Rights, or the manufacture, use,
sale, lease or other disposition of a Licensed Product will not infringe or violate a Third Party’s patent, copyright, or other intellectual property right. 

13. Section 12.1 (Remedy Limitation) is amended and restated in its entirety as below: 

12.1    Remedy Limitation. EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, (A) IN NO EVENT WILL UNIVERSITY OR FRED HUTCH BE
LIABLE FOR PERSONAL INJURY OR PROPERTY DAMAGES ARISING IN CONNECTION WITH THE ACTIVITIES CONTEMPLATED IN THIS AGREEMENT AND (B) IN NO EVENT WILL EITHER PARTY OR FRED HUTCH BE LIABLE FOR LOST PROFITS, LOST BUSINESS OPPORTUNITY, INVENTORY LOSS,
WORK STOPPAGE, LOST DATA OR ANY OTHER RELIANCE OR EXPECTANCY, INDIRECT, SPECIAL, 













 CONFIDENTIAL 

 

 
INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY KIND. FOR THE AVOIDANCE OF DOUBT, IN NO EVENT WILL COMPANY BE LIABLE FOR PERSONAL INJURY OR PROPERTY DAMAGES ARISING IN CONNECTION WITH THE ACTIVITIES
OF ANY THIRD PARTY LICENSEE OF UNIVERSITY UNDER ANY AND ALL LICENSES GRANTED BY UNIVERSITY TO SUCH THIRD PARTY UNDER THE LICENSED PATENTS TO MAKE, HAVE MADE ON SUCH THIRD PARTY’S BEHALF, USE, OFFER TO SELL, SELL, OFFER TO LEASE OR LEASE,
IMPORT, OR OTHERWISE OFFER TO DISPOSE OF LICENSED PRODUCTS IN THE TERRITORY IN THE CV FIELD OF USE 
  

	 	14.	 A new section as below, Section 13.3.5 (Disclosures to Fred Hutch), is added right after
Section 13.3.4 (Disclosure as Required by Law): 


 13.3.5     Disclosures to Fred Hutch. University has
obligations within the IIA to share with Fred Hutch copies of financial reports, Sublicenses, and other material documents received from Company. In such IIA Fred Hutch agrees, to the extent permitted by law, to keep confidential the terms of this
Agreement and any Confidential Information received from University related to the Company (e.g., revenues, business development reports, milestones accomplished, Sublicensee information and Sublicenses), except that Fred Hutch may report revenue it
receives, and other information in accordance with its reporting requirements to HHMI and any sponsors and may include such revenue in aggregate licensing revenue reported by them. 

15. Section 13.8 (Third Party Beneficiaries) is amended and restated in its entirety as below: 

13.8    Third-Party Beneficiaries. Except as identified in Section 13.22 “Express Third-Party Beneficiary” or other
parts of this Agreement referencing Fred Hutch, no provision of this Agreement, express or implied, confers upon any person other than the Parties to this Agreement, HHMI and Sublicensees (Sublicensees solely for purposes of enforcing Sections 9.8
“Sublicenses After Termination” and 13.22) any rights, remedies, obligations, or liabilities hereunder. No Sublicensee will have a right to enforce or seek damages under this Agreement other than as set forth in Section 13.22. The
Parties agree that no amendment or modification to Section 9.8 or Section 13.22.2 shall apply to a Sublicensee without the prior written consent of that Sublicensee, if such amendment occurs after the date of execution of the applicable
Sublicense. 
 16. Section 13.12 (Use of Names) is amended and restated in its entirety as below: 

13.12    Use of Names. 

13.12.1    No provision of this Agreement grants Company or Sublicensee any right or license to use the name or trademarks
of University or Fred Hutch or the names or identities of any member of the faculty (provided that Dr. Baker and [***] are subject to Subsection 13.12.2), staff, or student body of University. Except as provided herein, Company will not use,
and will not permit a Sublicensee to use, any such trademarks, names, or identities without University’s and Fred Hutch’s, as the case may be, such member’s prior written approval. Notwithstanding the foregoing, Company, Fred Hutch
and University may provide factual information regarding the existence of this Agreement. 













 CONFIDENTIAL 

 

 13.12.2 Company acknowledges that under HHMI policy, Company may not use the name of HHMI or
of any HHMI employee (including Dr. Baker and [***]) in a manner that reasonably could constitute an endorsement of a commercial product or service; but that use for other purposes, even if commercially motivated, is permitted provided that
(1) the use is limited to accurately reporting factual events or occurrences, and (2) any reference to the name of HHMI or any HHMI employees in press releases or similar materials intended for public release is approved by HHMI in
advance. 
  

	 	17.	 Item A2.1.2 (Performance Milestone 2) in the table in Section A2 of Exhibit A (Performance Milestones) is
amended and restated in its entirety as below: 


 [***] 

 

	 	18.	 All other terms and conditions of the Agreement shall remain in full force and effect. 



 

	 	19.	 This Amendment No. 2 may be executed by facsimile and in identical counterparts, each of which will be
deemed an original, but all of which together will constitute one and the same instrument. A facsimile, scanned, or photocopied signature (and any signature duplicated in another similar manner) identical to the original will be considered an
original signature. 


 IN WITNESS WHEREOF, the Parties have executed this Amendment No. 2 effective as of the
Amendment No. 2 Effective Date. 
  

									
	UNIVERSITY OF WASHINGTON	 		 	ICOSAVAX, INC.
					
	By:	 	/s/ Dennis Hanson	 		 	By:	 	/s/ Adam Simpson


									
					
	Name:	 	Dennis Hanson	 		 	Name:	 	Adam Simpson
					
	Title:	 	Senior Manager, UW CoMotion	 		 	Title:	 	Chief Executive Officer
					
	Date:	 	5/7/2021	 		 	Date:	 	5/7/2021