Consulting Agreement between Adverum Biotechnologies, Inc. and Leone Patterson, dated June 24, 2021

1.1    Commencing on the Effective Date, the Company hereby retains Consultant, and Consultant hereby agrees to perform consulting services for the Company as set forth herein. Upon Company’s request, Consultant agrees to devote its best efforts to provide to Company transition services and consultation pertaining to Consultant’s previous President and CFO duties and responsibilities (the “Services”), including a reasonable amount of informal consultation over the telephone or otherwise as requested by Company. The specific nature and amount of the Services to be performed shall be as determined by the Company during the term of this Agreement. Consultant shall only devote such time as is requested by the Company and shall render the Services at such times as may be mutually agreed between the parties. Consultant shall perform the Services at any Company location or at other places, upon mutual agreement of the parties hereto. Consultant will perform Services, and provide the results thereof, with the highest degree of professional skill and expertise. Consultant may use the assistance of other individuals only with the prior written consent of the Company.

1.2    Consultant currently holds various Company equity awards that were granted to Consultant during Consultant’s employment (the “Equity Awards”). Since Consultant’s service as an employee and a consultant will be continuous, Consultant’s termination of employment will not constitute a termination of service for purposes of the Company’s applicable stock or equity plan (the “Plan”). Thus, vesting of the Equity Awards will not cease as of the Separation Date and will continue for the duration of the Consulting Agreement. Consultant’s Equity Awards shall continue to be governed by the Plan and all applicable grant notices and agreements except as provided at Section 2 below.

4.1     At all times during the term of this Agreement and for seven (7) years thereafter, Consultant will hold in strictest confidence and will not disclose, use, lecture upon or publish any of the Company’s Proprietary Information (defined below), except to the extent such disclosure, use or publication may be required in direct connection with Consultant’s performing requested Services for Company or is expressly authorized in writing by an authorized representative of Company. Consultant will only disclose Company’s Proprietary Information to those of its officers, employees or other agents who are directly involved with performance under this Agreement or who have a need to see such Proprietary Information to enable it to perform its obligations under this Agreement. It is understood that the Proprietary Information will remain the sole property of Company. Consultant further agrees to take all reasonable precautions to prevent any unauthorized disclosure of the Proprietary Information including, but not limited to, having each employee, agent or representative of Consultant, if any, with access to any Proprietary Information execute a nondisclosure agreement containing provisions in Company's favor at least as restrictive with regards to Proprietary Information as Article 4 of this Agreement. Consultant will also notify Company, promptly and in writing, of any actual or suspected unauthorized use or disclosure of Proprietary Information. Consultant shall be responsible for the breach by any of its officers, employees, or agents of the obligations of confidentiality and non-use set forth herein.

4.2    The term “Proprietary Information” may include, without limitation: (a) intellectual property, such as, but not limited to, patents, patent applications, copyrights,

copyright applications, and trade secrets and/or (b) other proprietary or confidential information, including without limitation (i) information regarding ideas, technology and processes (such as, but not limited to, assays, techniques, sketches, schematics, drawings, works of authorship, models, designs, inventions, know-how, technical documentation, equipment, algorithms, software programs, software source documents, formulae); (ii) information concerning or resulting from research and development projects and other projects (such as, but not limited to, preclinical and clinical data, design details and specifications, engineering information, and works in process); (iii) business and financial information (such as, but not limited to, current, future, and proposed products and services, financial information and models, information relating to procurement requirements, purchasing, manufacturing, customer lists, product plans, product ideas, business strategies, marketing or business plans, financial or personnel matters, investors, employees, business and contractual relationships, business forecasts, sales and merchandising, and information regarding third parties, suppliers, customers, employees, investors or facilities); (iv) any information created using the foregoing Proprietary Information; and (v) any other information which is designated as “Confidential,” “Proprietary” or some similar designation Notwithstanding the foregoing, any information a reasonable person under the circumstances would understand to be confidential and proprietary to Company shall be considered the Proprietary Information. Proprietary Information may also include information previously disclosed to Consultant by third parties.

4.3    Proprietary Information shall not, however, include any information that Consultant can demonstrate by competent contemporaneous written proof: (a) was publicly known and made generally available in the public domain prior to the time of disclosure by the disclosing party; (b) becomes publicly known and made generally available after disclosure by Company to Consultant through no action or inaction of Consultant; (c) is already in the possession of the Consultant at the time of disclosure by Company; or (d) is obtained by Consultant from a third party without a breach of any obligations of confidentiality. Any combination of features or disclosures shall not be deemed to fall within the foregoing exclusions merely because certain individual features are published or available to the general public or in the rightful possession of the receiving party unless the combination as a whole falls within any of the above exceptions.

4.4    Notwithstanding the provisions of Section 4.1, Proprietary Information may be disclosed to the extent required by applicable laws or regulations or as ordered by a court or other regulatory body having competent jurisdiction, provided that Consultant (a) provides notice of the requested disclosure to the Company as soon as reasonably practicable, and (b) cooperates fully with the Company to take all legally available steps to prevent or narrow such disclosure, including, without limitation, by seeking a protective order or confidential treatment. Consultant will restrict any required disclosure to only that portion of the Company’s Proprietary Information which Consultant is advised by legal counsel is legally required to be disclosed.

4.5    In addition, Consultant understands that Company has received and in the future will receive from third parties confidential or proprietary information (“Third party Information”) subject to a duty on Company’s part to maintain the confidentiality of such information and to use it only for certain limited purposes. During the term of Consultant’s

association and thereafter, Consultant will hold Third party Information in the strictest confidence and will not disclose or use Third party Information, except in connection with Consultant’s performing requested Services for Company, or as expressly authorized in writing by an authorized representative of Company.

5.1    As used herein, “Intellectual Property” means: (a) any and all information, data, results, inventions and discoveries, whether or not patentable or copyrightable, made by Consultant individually or in conjunction with others in connection with the Services or based on any Proprietary Information, including, without limitation, all reports and other deliverables; (b) all modifications and/or improvements to the materials and any and all analogues, progeny, derivatives and/or reproducible and/or functional portions thereof made by Consultant individually or in conjunction with others, whether or not patentable; and (c) all intellectual property rights in and to all items described in clauses (a) and (b) above.

5.2    All Intellectual Property shall be the sole and exclusive property of the Company, and Consultant hereby assigns, and automatically will be deemed to have assigned, to the Company all Intellectual Property. Consultant shall promptly disclose to the Company any and all Intellectual Property. At the Company’s request and expense, Consultant shall undertake all further actions required to perfect the Company’s title to, and enjoyment of, such Intellectual Property.

5.3    Consultant hereby grants to the Company a nonexclusive, royalty-free, fully paid-up, worldwide, freely transferable and sublicenseable, irrevocable, perpetual license under any and all intellectual property rights now or hereafter owned and/or controlled by Consultant to exercise, exploit and otherwise fully enjoy the Company’s rights in and to the Intellectual Property, including, without limitation, to research, develop, make, have made, use, sell, offer for sale and/or import products and/or services based on or incorporating any Intellectual Property or any modification or derivative thereof.

5.4    Consultant will not incorporate any invention, improvement, development, concept, discovery or other proprietary information owned by any third party into any Intellectual Property without the Company’s prior written permission.

9.1    All Services performed under this Agreement by Consultant will at all times be in compliance with all applicable laws, regulations and guidelines, including, without limitation, any import/export control laws and any labor laws, including all applicable national, state and local fair employment practices laws. Any clause required to be in a document of this type by any applicable law or administrative regulation having the effect of law shall be deemed to be incorporated herein. Consultant warrants that the goods and Services shall comply with all applicable laws, standards and regulations, whether governmental or industrial, in effect on the date of delivery or known in the industry to become effective after such date.

9.2    Consultant’s performance under this Agreement shall comply with all applicable federal, state and local laws, rules and regulations and industry standards (collectively, “Regulatory Requirements”).

(a)Should any applicable Regulatory Requirements change during the term of this Agreement, Consultant will make every reasonable effort to satisfy the new Regulatory Requirements. In the event that compliance with such new Regulatory Requirements necessitates a change in this Agreement, Consultant will submit to the Company a revised technical and cost proposal for the Company’s acceptance prior to performing the Services.

(b)In the event of a conflict in applicable Regulatory Requirements, the Company, in consultation with Consultant, will designate the applicable Regulatory Requirements to be followed by Consultant in the performance of its Services.

9.3    Consultant will be responsible for obtaining and maintaining, at its sole expense, all permits, licenses, authorizations, approvals and the like necessary for carrying out its obligations under this Agreement.

9.4    Consultant will retain all applicable records in the manner and for the period required by the Regulatory Requirements or for a period of five (5) years, whichever is greater. During such period, if the Company notifies Consultant that it desires to receive such records, Consultant will promptly deliver such records to the Company or its designee.

9.5    In the event that any governmental or regulatory authority or any entity representing such an authority (each, a “Regulatory Authority”) requests access to Consultant’s records, facilities and/or personnel, or conducts an unannounced inspection, in each case relating to Services provided in connection with this Agreement, then Consultant shall promptly notify the contact set forth in the Notice section by phone. The Company shall have the right to be present at any audit or inspection by a Regulatory Authority that relates to Services and Consultant shall notify the Company of any such audit or inspection in advance when such notice is possible.

13.1     Entire Agreement, Modifications and Waiver. This Agreement is the product of both of the parties hereto, constitutes the entire agreement between such parties pertaining to the subject matter hereof, and supersedes any and all previous agreements and understandings, oral or written, relating to the subject matter hereof. No waiver of any rights under this Agreement will be effective unless in writing signed by the party waiving such rights. No failure or delay by a party in exercising any right, power or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege hereunder.

13.2    Further Assurances. Consultant agrees to execute, acknowledge and deliver such further instruments, and to do all such other acts, as may be necessary or appropriate in order to carry out the purposes and intent of this Agreement.

13.3    Construction. Headings included herein are for convenience only, and shall not be used to construe this Agreement. Ambiguities, if any, in this Agreement shall not be construed against any party, irrespective of which party may be deemed to have drafted the Agreement or authorized the ambiguous provision.

13.4    Severability. The invalidity or unenforceability of any provision of this Agreement will not affect the validity or enforceability of the other provisions of this Agreement; and if any provision of this Agreement is held by a court to be unenforceable then the parties will ask the court making such determination to alter such provision so that it is valid and enforceable and to enforce it in its altered form for all purposes contemplated by this Agreement.

13.5    Successors and Assigns. The terms and conditions of this Agreement shall inure to the benefit of and be binding upon the respective successors and permitted assigns of the parties; provided that neither party may assign this Agreement, or any of its rights, remedies, obligations or liabilities hereunder, without the prior written consent of the other party, except that either party may assign the Agreement in conjunction with the merger, consolidation or sale of such party’s business or of all or substantially all of its assets. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and permitted assigns any rights, remedies, obligations, or liabilities under or by reason of this Agreement, except as may be expressly provided in this Agreement.

13.6    Force Majeure. Except as otherwise herein provided, neither party shall be liable or deemed in default for failure to perform any duty or obligation that such party may have under this Agreement (other than a failure to make payment that is due and owing) where such failure has been occasioned by any act of terror, God, fire, inevitable accidents, war, civil unrest or any other cause outside the reasonable control of that party and occurring without its fault or negligence. The party whose performance has so been interrupted shall give the other party notice of the interruption and cause and shall use every reasonable means to resume full performance of this Agreement as soon as possible. In the event the period of non-performance exceeds sixty (60) days, the other party to this Agreement may terminate this Agreement without penalty immediately upon written notice of termination to the non-performing party.

13.7    Counterparts. This Agreement may be executed in one or more counterparts, each of which shall be deemed an original and all of which together shall constitute one instrument. Delivery of an executed counterpart of a signature page of this Agreement by facsimile or in electronic format (e.g., “pdf” or “tif”) shall be effective as delivery of a manually executed counterpart of this Agreement.