Valerie Barnett - Aug 18, 2025 Form 4 Insider Report for Cytek Biosciences, Inc. (CTKB)

Role
CHIEF LEGAL OFFICER
Signature
/s/ Valerie Barnett
Stock symbol
CTKB
Transactions as of
Aug 18, 2025
Transactions value $
-$35,846
Form type
4
Date filed
8/20/2025, 05:49 PM
Previous filing
May 21, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Barnett Valerie CHIEF LEGAL OFFICER C/O CYTEK BIOSCIENCES, INC., 47215 LAKEVIEW BOULEVARD, FREMONT /s/ Valerie Barnett 2025-08-20 0001873091

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CTKB Common Stock Options Exercise +2.02K +2.41% 85.7K Aug 18, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$3.19K -786 -0.92% $4.06 84.9K Aug 18, 2025 Direct F2
transaction CTKB Common Stock Options Exercise +3.68K +4.34% 88.6K Aug 18, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$5.82K -1.43K -1.62% $4.06 87.2K Aug 18, 2025 Direct F2
transaction CTKB Common Stock Options Exercise +7.74K +8.88% 94.9K Aug 18, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$12.2K -3K -3.16% $4.06 91.9K Aug 18, 2025 Direct F2
transaction CTKB Common Stock Options Exercise +10.9K +11.84% 103K Aug 18, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$14.7K -3.61K -3.51% $4.06 99.2K Aug 18, 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction CTKB Restricted Stock Units Options Exercise $0 -2.02K -37.49% $0.00 3.36K Aug 18, 2025 Common Stock 2.02K Direct F1, F3
transaction CTKB Restricted Stock Units Options Exercise $0 -3.68K -13.63% $0.00 23.3K Aug 18, 2025 Common Stock 3.68K Direct F1, F4
transaction CTKB Restricted Stock Units Options Exercise $0 -7.74K -8.82% $0.00 79.9K Aug 18, 2025 Common Stock 7.74K Direct F1, F5
transaction CTKB Restricted Stock Units Options Exercise $0 -10.9K -6.52% $0.00 156K Aug 18, 2025 Common Stock 10.9K Direct F1, F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.
F2 Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2025, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.
F3 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.
F4 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 on March 10, 2024 and each March 10 thereafter, until fully vested.
F5 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, 2024 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2024 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2024 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter.
F6 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, 2025 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2025 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2025 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2026 and each March 10 thereafter, until fully vested.