 HONOLULU, April 8, 2021 PRNewswire -- The Sonic Fund II, L.P. Sonic, which beneficially owns approximately 6.7 of the outstanding common stock of Adverum Biotechnologies, Inc. NASDAQ: ADVM the Company or Adverum, announced today that it has filed a preliminary proxy statement and GREEN proxy card with the SEC in conjunction with the Companys 2021 annual meeting of shareholders the 2021 Annual Meeting, which is expected to take place sometime in mid-May to early June. 