Michael Holder - 18 Nov 2025 Form 4 Insider Report for Cytek Biosciences, Inc. (CTKB)

Role
Director
Signature
/s/ Valerie Barnett, Attorney-in-Fact
Issuer symbol
CTKB
Transactions as of
18 Nov 2025
Net transactions value
$0
Form type
4
Filing time
20 Nov 2025, 18:53:27 UTC
Previous filing
20 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Holder Michael Director C/O CYTEK BIOSCIENCES, INC., 47215 LAKEVIEW BLVD., FREMONT /s/ Valerie Barnett, Attorney-in-Fact 20 Nov 2025 0001515140

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CTKB Common Stock Options Exercise +2,181 +21% 12,359 18 Nov 2025 Direct F1

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 -2,181 -14% $0.000000 13,819 18 Nov 2025 Common Stock 2,181 Direct F1, F2
* 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 2/36 of the total shares subject to the RSU Award shall vest on August 18, 2024; 3/36 of the total shares subject to the RSU Award shall vest on November 18, 2024 and each November 18 thereafter; 4/36 of the total shares underlying the RSU Award shall vest on March 10, 2025 and each March 10 thereafter; 2/36 of the total shares underlying the RSU Award vesting shall vest on May 18, 2025 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award shall vest on August 18, 2025 and each August 18 thereafter, until fully vested.