Adverum Announces Board Slate for 2021 Annual Meeting and Reiterates Commitment to Stockholder Value Creation Equity Performance: from Sonic Fund letter to Adverum Equity Performance: from Sonic Fund letter to Adverum Image 1: from Sonic Fund letter to Adverum Image 1: from Sonic Fund letter to Adverum Image 2: from Sonic Fund letter to Adverum Image 2: from Sonic Fund letter to Adverum Image 3: from Sonic Fund letter to Adverum Image 3: from Sonic Fund letter to Adverum Image 4: from Sonic Fund letter to Adverum Image 4: from Sonic Fund letter to Adverum Image 5: from Sonic Fund letter to Adverum Image 5: from Sonic Fund letter to Adverum