X0306 4 2017-12-13 0 0001626971 Corvus Pharmaceuticals, Inc. CRVS 0000939012 LEA LEIV CORVUS PHARMACEUTICALS, INC. 863 MITTEN ROAD, SUITE 102 BURLINGAME CA 94010 0 1 0 0 Chief Financial Officer Common Stock, $0.0001 par value 149206 I By Trust Stock Option (Right to Buy) 10.60 2017-12-13 4 A 0 40000 0.00 A 2027-12-13 Common Stock 40000 40000 D A portion of these shares is subject to a right of repurchase held by the Issuer. These shares are held by Leiv Lea and Deborah Karlson, Trustees of the Karlson Lea Family Trust UTA dated February 11, 1998 (the "Karlson Lea Trust"). Mr. Lea has shared voting, investment and dispositive power over the shares held by the Karlson Lea Trust. The underlying shares subject to the option vest and become exercisable as to one-forty eighth (1/48th) of the shares subject to the option in successive, equal monthly installments measured from December 13, 2017, subject to Reporting Person's continued service relationship with the Issuer on each such vesting date. /s/ Leiv Lea 2017-12-15