The Sonic Fund II, L.P. Issues Presentation Correcting Adverum’s Misstatements

• Highlights Numerous Mischaracterizations in Adverum’s Recent Investor Presentation
• Sonic’s Sole Aim in this Contest is for Adverum to Have Best Board Possible to Ensure Development and Approval of Company’s Potentially Life-Changing Treatment
• Urges Stockholders to Vote on the GREEN Proxy Card Today to Elect Sonic’s Three Independent Director Nominees to Drastically Improve Board

HONOLULU--(BUSINESS WIRE)-- The Sonic Fund II, L.P. (“Sonic”), which beneficially owns approximately 6.8% of the outstanding common stock of Adverum Biotechnologies, Inc. (NASDAQ: ADVM) (the “Company” or “Adverum”), today issued a supplemental presentation detailing – and correcting – a number of the Company’s recent misstatements. Sonic has nominated three independent, highly qualified director candidates – Jean Bennett, Jodi Cook and Herbert Hughes (the “Nominees”) – for election to the Adverum Board of Directors (the “Board”) at the 2021 Annual Meeting of Stockholders (the “2021 Annual Meeting”).

The presentation, entitled “Adverum’s Myths: Correcting the Record,” is available at: https://www.saveadverum.com/investor-materials.

Vote on the GREEN proxy card today

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