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McCombe William D.

Disclosed activity across 2 companies

Tapewire entity
21278
SEC CIK
0001878824

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Cytek Biosciences, Inc.CTKB · Entity 5345Chief Financial OfficerAugust 18, 2026August 20, 2026
Velo3D, Inc.VLD · Entity 5750Director · Chief Financial OfficerAugust 15, 2023August 24, 2023

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Cytek Biosciences, Inc.

Report date August 18, 2026 · Filed August 20, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect134,693 Ending reported balance After 2026-08-18 transaction · row 6
6 source rows · reconciled sequence

Row 1 · 2026-08-18 · Exercise / conversion · Acquired 6,320 · Balance 117,497

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Row 2 · 2026-08-18 · Tax withholding · Disposed 2,111 · Balance 115,386

F2: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Row 3 · 2026-08-18 · Exercise / conversion · Acquired 13,051 · Balance 128,437

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Row 4 · 2026-08-18 · Tax withholding · Disposed 4,392 · Balance 124,045

F2: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Row 5 · 2026-08-18 · Exercise / conversion · Acquired 16,049 · Balance 140,094

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Row 6 · 2026-08-18 · Tax withholding · Disposed 5,401 · Balance 134,693

F2: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Restricted Stock UnitsSEC Table II · derivative / convertible securityDirect44,249 Reported balance After 2026-08-18 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2026-08-18 · Exercise / conversion · Disposed 6,320 · Balance 44,249

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3: The shares underlying 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; 3/48 of the total shares underlying the RSU Award vesting on 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.

Restricted Stock UnitsSEC Table II · derivative / convertible securityDirect134,862 Reported balance After 2026-08-18 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-08-18 · Exercise / conversion · Disposed 13,051 · Balance 134,862

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4: The shares underlying 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.

Restricted Stock UnitsSEC Table II · derivative / convertible securityDirect230,042 Reported balance After 2026-08-18 transaction · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · 2026-08-18 · Exercise / conversion · Disposed 16,049 · Balance 230,042

F1: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F5: The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.

Filing footnotes · ownership attribution and instrument terms

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, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

F3: The shares underlying 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; 3/48 of the total shares underlying the RSU Award vesting on 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 underlying 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.

F5: The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.

Velo3D, Inc.

Report date August 15, 2023 · Filed August 24, 2023

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect169,998 Ending reported balance After 2023-08-21 transaction · row 3
3 source rows · reconciled sequence

Row 1 · 2023-08-15 · Exercise / conversion · Acquired 9,935 · Balance 160,404

F1: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.

Row 2 · 2023-08-15 · Exercise / conversion · Acquired 20,795 · Balance 181,199

F1: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.

Row 3 · 2023-08-21 · Sale · Disposed 11,201 · Balance 169,998

F2: The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.

Restricted Stock Unit (RSU)SEC Table II · derivative / convertible securityDirect89,417 Reported balance After 2023-08-15 transaction · row 4 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 4 · 2023-08-15 · Exercise / conversion · Disposed 9,935 · Balance 89,417

F1: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.

F3: The RSUs vest as to 1/4th of the total grant on November 15, 2022, and thereafter 1/16th of the total grant vest quarterly until such time as the RSUs are 100% vested, subject to the continued service of the Reporting Person on each vesting date.

Restricted Stock Unit (RSU)SEC Table II · derivative / convertible securityDirect41,588 Reported balance After 2023-08-15 transaction · row 5 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 5 · 2023-08-15 · Exercise / conversion · Disposed 20,795 · Balance 41,588

F1: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.

F4: The RSUs vest in four equal quarterly installments on May 15, 2023, August 15, 2023, November 15, 2023, and February 15, 2024, subject to the continued service of the Reporting Person on each vesting date.

Filing footnotes · ownership attribution and instrument terms

F1: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.

F2: The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.

F3: The RSUs vest as to 1/4th of the total grant on November 15, 2022, and thereafter 1/16th of the total grant vest quarterly until such time as the RSUs are 100% vested, subject to the continued service of the Reporting Person on each vesting date.

F4: The RSUs vest in four equal quarterly installments on May 15, 2023, August 15, 2023, November 15, 2023, and February 15, 2024, subject to the continued service of the Reporting Person on each vesting date.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 16,049 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · derivative · entry 9

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 230,042

Underlying: Common Stock · 16,049 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F5 · derivative.exercise_date: The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.

F5 · derivative.expiration_date: The shares underlying the RSU Award shall vest over 4 years, with 2/48 of the total shares underlying the RSU Award vesting on May 18, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 13,051 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · derivative · entry 8

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,862

Underlying: Common Stock · 13,051 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: The shares underlying 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.

F4 · derivative.expiration_date: The shares underlying 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.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 6,320 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · derivative · entry 7

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,249

Underlying: Common Stock · 6,320 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: The shares underlying 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; 3/48 of the total shares underlying the RSU Award vesting on 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.

F3 · derivative.expiration_date: The shares underlying 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; 3/48 of the total shares underlying the RSU Award vesting on 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.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 5,401 $4.67 $25,222.67
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,693

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 16,049 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 140,094

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 4,392 $4.67 $20,510.64
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,045

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 13,051 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,437

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 2,111 $4.67 $9,858.37
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,386

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
August 18, 2026 Filed Aug 20, 2026 20:34 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 6,320 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000004 · form4-08202026_080854.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 117,497

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 10,699 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · derivative · entry 9

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 246,091

Underlying: Common Stock · 10,699 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F5 · derivative.exercise_date: 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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter, until fully vested.

F5 · derivative.expiration_date: 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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter, until fully vested.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 8,700 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · derivative · entry 8

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 147,913

Underlying: Common Stock · 8,700 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 6,320 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · derivative · entry 7

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,569

Underlying: Common Stock · 6,320 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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 on 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.

F3 · derivative.expiration_date: 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 on 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.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 3,839 $3.55 $13,628.45
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,177

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on May 18, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 10,699 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,016

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 3,122 $3.55 $11,083.10
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,317

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on May 18, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 8,700 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 107,439

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 2,268 $3.55 $8,051.40
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,739

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on May 18, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
May 18, 2026 Filed May 20, 2026 21:48 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 6,320 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000002 · form4-05202026_090502.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,007

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 17,401 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · derivative · entry 8

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,613

Underlying: Common Stock · 17,401 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 6,320 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · derivative · entry 7

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,889

Underlying: Common Stock · 6,320 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F5 · derivative.exercise_date: 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 on 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.

F5 · derivative.expiration_date: 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 on 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.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantRestricted Stock Units · Derivative 256,790 $0.00 $0.00
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · derivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 256,790

Underlying: Common Stock · 256,790 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: 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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter, until fully vested.

F4 · derivative.expiration_date: 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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter, until fully vested.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantEmployee Stock Option (right to buy) · Derivative 136,205 $0.00 Strike: $4.23 $0.00
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · derivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 136,205

Underlying: Common Stock · 136,205 shares

Expires 2036-03-09

F3 · derivative.exercise_date: The shares subject to the stock option shall vest over 4 years with 1/48 of the total shares underlying the stock option vesting on April 10, 2026 and each month thereafter until fully vested.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 7,145 $4.23 $30,223.35
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,687

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on March 10, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 17,401 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,832

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 2,603 $4.23 $11,010.69
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,431

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on March 10, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:37 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 6,320 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-26-000001 · form4-03122026_080323.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,034

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 13,051 $0.00 $0.00
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · derivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 174,014

Underlying: Common Stock · 13,051 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 6,320 $0.00 $0.00
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · derivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,209

Underlying: Common Stock · 6,320 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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 on 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.

F3 · derivative.expiration_date: 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 on 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.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 4,196 $5.53 $23,203.88
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,714

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on November 18, 2025, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 13,051 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,910

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 2,032 $5.53 $11,236.96
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,859

F2 · shares: Represents the number of shares withheld by and surrendered to the Issuer on November 18, 2025, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.

Read SEC document
November 18, 2025 Filed Nov 21, 2025 00:03 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 6,320 Not disclosed Not disclosed
Disclosure

SEC source: 0001878824-25-000002 · form4-11212025_121127.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,891

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 13,051 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · derivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 187,065

Underlying: Common Stock · 13,051 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 6,320 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · derivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,529

Underlying: Common Stock · 6,320 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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 on 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.

F3 · derivative.expiration_date: 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 on 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.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 5,084 $4.06 $20,641.04
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,571

F2 · shares: 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.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 13,051 Not disclosed Not disclosed
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,655

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 2,462 $4.06 $9,995.72
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,604

F2 · shares: 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.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 21:45 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 6,320 Not disclosed Not disclosed
Disclosure

SEC source: 0001415889-25-022520 · form4-08202025_090817.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,066

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
June 02, 2025 Filed Jun 3, 2025 21:39 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 PurchaseCommon Stock 35,000 $2.78 $97,300.00
Disclosure

SEC source: 0001415889-25-015442 · form4-06032025_090608.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,746

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.76 to $2.81, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

Read SEC document
May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 8,700 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · derivative · entry 6

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 200,116

Underlying: Common Stock · 8,700 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

Read SEC document
May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionRestricted Stock Units · Derivative 25,283 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · derivative · entry 5

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,849

Underlying: Common Stock · 25,283 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

Read SEC document
May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 3,389 $2.69 $9,116.41
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · nonDerivative · entry 4

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,746

F2 · shares: 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.

Read SEC document
May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 8,700 Not disclosed Not disclosed
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,135

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

Read SEC document
May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Tax withholdingCommon Stock 9,848 $2.69 $26,491.12
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · nonDerivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,435

F2 · shares: 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.

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May 19, 2025 Filed May 21, 2025 21:57 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 Exercise / conversionCommon Stock 25,283 Not disclosed Not disclosed
Disclosure

SEC source: 0001415889-25-013984 · form4-05212025_090504.xml · nonDerivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,283

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

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March 04, 2025 Filed Mar 6, 2025 22:56 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantRestricted Stock Units · Derivative 208,816 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-007282 · form4-03062025_100326.xml · derivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 208,816

Underlying: Common Stock · 208,816 shares

Expires not disclosed

F2 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

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March 04, 2025 Filed Mar 6, 2025 22:56 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantEmployee Stock Option (right to buy) · Derivative 330,882 $0.00 Strike: $4.31 $0.00
Disclosure

SEC source: 0001415889-25-007282 · form4-03062025_100326.xml · derivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 330,882

Underlying: Common Stock · 330,882 shares

Expires 2035-03-04

F1 · derivative.exercise_date: The shares subject to the option shall vest over 4 years with 1/48 of the total shares underlying the option vesting on April 4, 2025 and each month thereafter until fully vested.

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May 13, 2024 Filed May 15, 2024 23:19 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantRestricted Stock Units · Derivative 101,132 $0.00 $0.00
Disclosure

SEC source: 0001415889-24-013281 · form4-05152024_110545.xml · derivative · entry 2

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,132

Underlying: Common Stock · 101,132 shares

Expires not disclosed

F2 · derivative.exercise_price: Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

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May 13, 2024 Filed May 15, 2024 23:19 UTC Cytek Biosciences, Inc. CTKB · Entity 5345 GrantEmployee Stock Option (right to buy) · Derivative 150,602 $0.00 Strike: $6.18 $0.00
Disclosure

SEC source: 0001415889-24-013281 · form4-05152024_110545.xml · derivative · entry 1

McCombe William D. · CIK 0001878824 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,602

Underlying: Common Stock · 150,602 shares

Expires 2034-05-13

F1 · derivative.exercise_date: The shares subject to the option shall vest over 4 years with 25% of the total shares underlying the option vesting on May 13, 2025 and 1/48th of the total shares subject to the option vesting each month thereafter.

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August 21, 2023 Filed Aug 24, 2023 01:05 UTC Velo3D, Inc. VLD · Entity 5750 SaleCommon Stock 11,201 $1.49 $16,689.49
Disclosure

SEC source: 0001209191-23-047145 · doc4.xml · nonDerivative · entry 3

McCombe William D. · CIK 0001878824 · Director · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,998

F2 · kind: The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.