X0206 3 2019-09-17 0 0001496323 IGM Biosciences, Inc. IGMS 0001787681 Chen Daniel ShinYu C/O IGM BIOSCIENCES, INC. 325 E. MIDDLEFIELD ROAD MOUNTAIN VIEW CA 94043 0 1 0 0 Chief Medical Officer Common Stock 116518 D Stock Option (right to buy) 1.39 2028-12-30 Common Stock 361090 D 58,259 of the shares subject to this grant are subject to forfeiture until August 1, 2020 in accordance with the Reporting Person's Restricted Stock Grant Agreement. 1/4 of the shares subject to the option shall vest on August 1, 2019 and an additional 1/48 of the shares subject to the option shall vest monthly thereafter subject to Reporting Person remaining a service provider through each such date. /s/ Misbah Tahir, by power of attorney 2019-09-17