X0306 4 2023-03-03 0 0001831915 Cytek Biosciences, Inc. CTKB 0001874301 Poirson Allen C/O CYTEK BIOSCIENCES, INC. 47215 LAKEVIEW BOULEVARD FREMONT CA 94538 0 1 0 0 SVP Bus. and Corp. Dev. Employee Stock Option (Right to Buy) 10.61 2023-03-03 4 A 0 60541 0.00 A 2033-03-03 Common Stock 60541 60541 D Restricted Stock Units 2023-03-03 4 A 0 40056 0.00 A Common Stock 40056 40056 D 1/48th of the shares subject to the option shall vest monthly over four years from the vesting commencement date of March 3, 2023. The option becomes fully vested on March 3, 2027. 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 over 4 years with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2023 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2023 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2023 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting each March 10, 2024 and each March 10 thereafter, until fully vested. /s/ Valerie Barnett, Attorney-in-Fact for Allen Poirson 2023-03-07