X0306 4 2022-05-18 0 0001831915 Cytek Biosciences, Inc. CTKB 0001872873 Jiang Wenbin C/O CYTEK BIOSCIENCES, INC. 47215 LAKEVIEW BOULEVARD FREMONT CA 94538 1 1 0 0 President and CEO Common Stock 2022-05-18 4 M 0 9011 A 7905051 D Common STock 2022-05-18 4 F 0 3510 9.65 D 7901541 D Restricted Stock Units 2022-05-18 4 M 0 9011 0.00 D Common Stock 9011 99126 D Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. Represents the number of shares withheld by and surrendered to the Issuer on May 18, 2022, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award. 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 Wenbin Jiang 2022-05-20