William D. McCombe - May 19, 2025 Form 4 Insider Report for Cytek Biosciences, Inc. (CTKB)

Role
Chief Financial Officer
Signature
/s/ Valerie Barnett, Attorney-in-Fact
Stock symbol
CTKB
Transactions as of
May 19, 2025
Transactions value $
-$35,608
Form type
4
Date filed
5/21/2025, 05:57 PM
Previous filing
Mar 6, 2025
Next filing
Jun 3, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
McCombe William D. Chief Financial Officer C/O CYTEK BIOSCIENCES, INC., 47215 LAKEVIEW BOULEVARD, FREMONT /s/ Valerie Barnett, Attorney-in-Fact 2025-05-21 0001878824

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CTKB Common Stock Options Exercise +25.3K 25.3K May 19, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$26.5K -9.85K -38.95% $2.69 15.4K May 19, 2025 Direct F2
transaction CTKB Common Stock Options Exercise +8.7K +56.37% 24.1K May 19, 2025 Direct F1
transaction CTKB Common Stock Tax liability -$9.12K -3.39K -14.04% $2.69 20.7K May 19, 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 -25.3K -25% $0.00 75.8K May 19, 2025 Common Stock 25.3K Direct F1, F3
transaction CTKB Restricted Stock Units Options Exercise $0 -8.7K -4.17% $0.00 200K May 19, 2025 Common Stock 8.7K Direct F1, F4
* 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 May 19, 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 over 4 years with 12/48 of the total shares underlying the RSU Award vesting on May 18, 2025; 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 3/48 of the total shares underlying the RSU Award vesting each March 10, 2026 and each March 10 thereafter; and 3/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter.
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, 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 each March 10, 2026 and each March 10 thereafter, until fully vested.