X0306 4 2022-02-28 0 0001831915 Cytek Biosciences, Inc. CTKB 0001874041 Yan Ming C/O CYTEK BIOSCIENCES, INC. 47215 LAKEVIEW BOULEVARD FREMONT CA 94538 1 1 0 0 Chief Technology Officer Stock Option (Right to Buy) 13.64 2022-02-28 4 A 0 47841 0.00 A 2032-02-28 Common Stock 47841 47841 D Restricted Stock Units 2022-02-28 4 A 0 31708 0.00 A Common Stock 31708 31708 D 1/48th of the shares subject to the option vest monthly over four years from the vesting commencement date of January 1, 2022. The option becomes fully vested on January 1, 2026. Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. The shares subject to the RSU Award shall vest quarterly over four years, with 4/48th of the total shares underlying the RSU Award vesting on May 18, 2022 and 3/48th of the total shares underlying the RSU Award vesting each subsequent quarter thereafter on August 18, November 18, February 18 and May 18. /s/ Valerie Barnett, Attorney-in-Fact for Ming Yan 2022-03-02