X0306 4 2021-01-15 1 0001590750 Viridian Therapeutics, Inc.\DE MGEN 0001815345 Rauch Lee M. C/O MIRAGEN THERAPEUTICS, INC. 6200 LOOKOUT ROAD BOULDER CO 80301 0 0 0 1 See Remarks Employee Stock Option (right to buy) 23.03 2021-01-18 4 A 0 15000 0.00 A 2031-01-17 Common Stock 15000 15000 D The option vests in equal monthly installments over the following 6 months, subject to the Reporting Person's continued service to Issuer through each vesting date. Former Director; Former President & CEO Note: This "Exit" Form 4 is voluntarily filed to report solely that the Reporting Person is no longer serving in the role as the Company's President & Chief Executive Officer, and no longer serving on the Company's Board of Directors, all effective as of January 15, 2021, and therefore is no longer subject to Section 16 reporting. /s/ Rauch Lee M. 2021-01-19