STOCK TITAN

[Form 4] Cytek Biosciences, Inc. Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Negative)
Form Type
4
Rhea-AI Filing Summary

William D. McCombe, Chief Financial Officer and Director of Cytek Biosciences, Inc. (CTKB), reported changes in beneficial ownership related to vesting of restricted stock units on 08/18/2025.

The filing shows two RSU vesting events recorded as acquisitions of 6,320 and 13,051 RSUs (each RSU convertible into one share). To satisfy tax withholding on the vesting, the issuer withheld 2,462 and 5,084 shares at a per-share price of $4.06. Post-transaction ownership figures reported in the form include multiple balances (for common stock and underlying derivative holdings), with derivative share totals of 6,320 and 13,051 underlying shares and aggregate beneficial ownership figures shown in the filing. The RSUs vest over four years on a specified schedule described in the explanations. The form was signed by an attorney-in-fact on 08/20/2025.

William D. McCombe, Chief Financial Officer e membro del consiglio di amministrazione di Cytek Biosciences, Inc. (CTKB), ha comunicato variazioni nella propria titolarità beneficiaria in relazione al consolidamento di restricted stock unit il 18/08/2025.

La comunicazione riporta due eventi di maturazione di RSU registrati come acquisizioni di 6.320 e 13.051 RSU (ogni RSU convertibile in una azione). Per coprire le ritenute fiscali dovute alla maturazione, la società ha trattenuto rispettivamente 2.462 e 5.084 azioni a un prezzo per azione di $4,06. Nei dati post-transazione indicati nel modulo figurano più saldi (per azioni ordinarie e per posizioni derivanti), con totali di azioni sottostanti derivanti da strumenti pari a 6.320 e 13.051 e un ammontare complessivo della proprietà beneficiaria riportato nel deposito. Le RSU maturano su un periodo di quattro anni secondo il calendario descritto nelle spiegazioni. Il modulo è stato firmato per procura il 20/08/2025.

William D. McCombe, Director Financiero y miembro del consejo de Cytek Biosciences, Inc. (CTKB), informó cambios en la propiedad beneficiaria relacionados con la consolidación de unidades restringidas de acciones el 18/08/2025.

La presentación muestra dos eventos de adquisición por vesting de RSU registrados como adquisiciones de 6.320 y 13.051 RSU (cada RSU convertible en una acción). Para cubrir la retención fiscal derivada del vesting, el emisor retuvo 2.462 y 5.084 acciones a un precio por acción de $4,06. Las cifras de propiedad posteriores a la transacción informadas en el formulario incluyen varios saldos (acciones ordinarias y posiciones derivadas), con totales de acciones subyacentes a derivados de 6.320 y 13.051 y una titularidad beneficiaria agregada reflejada en la presentación. Las RSU se consolidan durante cuatro años según el calendario descrito en las notas. El formulario fue firmado por un apoderado el 20/08/2025.

William D. McCombe는 Cytek Biosciences, Inc.(CTKB)의 최고재무책임자이자 이사로서 2025-08-18에 제한부주식(RSU) 권리의 성립(vesting)과 관련한 실질적 소유권 변동을 보고했습니다.

신고서에는 각각 6,320주와 13,051주의 RSU가 성립된 두 건이 취득으로 기재되어 있습니다(각 RSU는 1주로 전환 가능). 성립으로 인한 세금 원천징수를 충당하기 위해 발행사는 주당 $4.06의 가격으로 각각 2,462주와 5,084주를 원천징수했습니다. 보고서의 거래 후 보유 내역에는 보통주와 파생상품에 해당하는 여러 잔액이 포함되어 있으며, 파생상품 기준 기초 주식 수는 각각 6,320주와 13,051주로 기재되어 있고, 전체 실질적 소유권 수치도 표시되어 있습니다. 해당 RSU는 설명에 기재된 일정에 따라 4년간에 걸쳐 성립됩니다. 서류는 2025-08-20에 법정대리인(또는 위임인)에 의해 서명되었습니다.

William D. McCombe, directeur financier et administrateur de Cytek Biosciences, Inc. (CTKB), a déclaré des changements de propriété bénéficiaire liés au vesting d'unités d'actions restreintes le 18/08/2025.

Le dépôt fait état de deux événements de vesting enregistrés comme acquisitions de 6 320 et 13 051 RSU (chaque RSU convertible en une action). Pour couvrir la retenue fiscale liée au vesting, l'émetteur a retenu 2 462 et 5 084 actions au prix de 4,06 $ par action. Les soldes après transaction figurant dans le formulaire incluent plusieurs positions (actions ordinaires et positions dérivées), les totaux d'actions sous-jacentes aux dérivés étant 6 320 et 13 051, avec une propriété bénéficiaire agrégée présentée dans le dépôt. Les RSU acquièrent selon un calendrier étalé sur quatre ans décrit dans les explications. Le formulaire a été signé par un mandataire le 20/08/2025.

William D. McCombe, Chief Financial Officer und Director von Cytek Biosciences, Inc. (CTKB), meldete Änderungen des wirtschaftlichen Eigentums im Zusammenhang mit dem Vesting von Restricted Stock Units am 18.08.2025.

Die Einreichung weist zwei Vesting-Ereignisse aus, die als Erwerb von 6.320 bzw. 13.051 RSUs (jeweils in eine Aktie wandelbar) verbucht wurden. Zur Deckung der steuerlichen Einbehalte beim Vesting einbehaltene Aktien betrugen 2.462 bzw. 5.084 zu einem Kurs von $4,06 je Aktie. In den nach der Transaktion ausgewiesenen Beständen im Formular sind mehrere Salden (Stammaktien und derivativen Positionen) aufgeführt; die zugrundeliegenden Derivat-Aktien summieren sich auf 6.320 und 13.051 und es wird ein aggregierter wirtschaftlicher Besitz angegeben. Die RSUs vesten über vier Jahre nach dem im Bericht beschriebenen Zeitplan. Das Formular wurde am 20.08.2025 von einem Bevollmächtigten unterschrieben.

Positive
  • RSU vesting disclosed, showing alignment of executive compensation with long-term retention
  • No open-market sales reported other than shares withheld to satisfy tax obligations
Negative
  • Shares withheld for tax withholding reduced the net increase in beneficial ownership
  • Filing shows standard dilution potential as multiple RSU tranches remain scheduled to vest

Insights

TL;DR: Routine executive equity vesting and tax-withholding; no sales beyond withholding, so limited immediate market impact.

The Form 4 documents standard compensation vesting for the CFO with two RSU vesting events that increased his beneficially owned shares while triggering share-withholding to satisfy taxes at $4.06 per share. This is a non-dispositive event for investors: it does not indicate a cash sale or material disposition beyond withholding, and reported post-transaction holdings remain concentrated as shown. The filing provides clear vesting schedules and exact withheld-share counts, allowing precise tracking of future share releases.

TL;DR: Vesting of executive RSUs aligns compensation with retention; disclosure is timely and complies with Section 16 reporting.

The submission discloses the mechanics of RSU vesting and tax withholding consistent with standard equity compensation practices. The detailed vesting timetable and number of shares withheld for taxes support transparency around insider incentives and dilution timing. There is no indication of unexpected dispositions or governance concerns in this filing.

William D. McCombe, Chief Financial Officer e membro del consiglio di amministrazione di Cytek Biosciences, Inc. (CTKB), ha comunicato variazioni nella propria titolarità beneficiaria in relazione al consolidamento di restricted stock unit il 18/08/2025.

La comunicazione riporta due eventi di maturazione di RSU registrati come acquisizioni di 6.320 e 13.051 RSU (ogni RSU convertibile in una azione). Per coprire le ritenute fiscali dovute alla maturazione, la società ha trattenuto rispettivamente 2.462 e 5.084 azioni a un prezzo per azione di $4,06. Nei dati post-transazione indicati nel modulo figurano più saldi (per azioni ordinarie e per posizioni derivanti), con totali di azioni sottostanti derivanti da strumenti pari a 6.320 e 13.051 e un ammontare complessivo della proprietà beneficiaria riportato nel deposito. Le RSU maturano su un periodo di quattro anni secondo il calendario descritto nelle spiegazioni. Il modulo è stato firmato per procura il 20/08/2025.

William D. McCombe, Director Financiero y miembro del consejo de Cytek Biosciences, Inc. (CTKB), informó cambios en la propiedad beneficiaria relacionados con la consolidación de unidades restringidas de acciones el 18/08/2025.

La presentación muestra dos eventos de adquisición por vesting de RSU registrados como adquisiciones de 6.320 y 13.051 RSU (cada RSU convertible en una acción). Para cubrir la retención fiscal derivada del vesting, el emisor retuvo 2.462 y 5.084 acciones a un precio por acción de $4,06. Las cifras de propiedad posteriores a la transacción informadas en el formulario incluyen varios saldos (acciones ordinarias y posiciones derivadas), con totales de acciones subyacentes a derivados de 6.320 y 13.051 y una titularidad beneficiaria agregada reflejada en la presentación. Las RSU se consolidan durante cuatro años según el calendario descrito en las notas. El formulario fue firmado por un apoderado el 20/08/2025.

William D. McCombe는 Cytek Biosciences, Inc.(CTKB)의 최고재무책임자이자 이사로서 2025-08-18에 제한부주식(RSU) 권리의 성립(vesting)과 관련한 실질적 소유권 변동을 보고했습니다.

신고서에는 각각 6,320주와 13,051주의 RSU가 성립된 두 건이 취득으로 기재되어 있습니다(각 RSU는 1주로 전환 가능). 성립으로 인한 세금 원천징수를 충당하기 위해 발행사는 주당 $4.06의 가격으로 각각 2,462주와 5,084주를 원천징수했습니다. 보고서의 거래 후 보유 내역에는 보통주와 파생상품에 해당하는 여러 잔액이 포함되어 있으며, 파생상품 기준 기초 주식 수는 각각 6,320주와 13,051주로 기재되어 있고, 전체 실질적 소유권 수치도 표시되어 있습니다. 해당 RSU는 설명에 기재된 일정에 따라 4년간에 걸쳐 성립됩니다. 서류는 2025-08-20에 법정대리인(또는 위임인)에 의해 서명되었습니다.

William D. McCombe, directeur financier et administrateur de Cytek Biosciences, Inc. (CTKB), a déclaré des changements de propriété bénéficiaire liés au vesting d'unités d'actions restreintes le 18/08/2025.

Le dépôt fait état de deux événements de vesting enregistrés comme acquisitions de 6 320 et 13 051 RSU (chaque RSU convertible en une action). Pour couvrir la retenue fiscale liée au vesting, l'émetteur a retenu 2 462 et 5 084 actions au prix de 4,06 $ par action. Les soldes après transaction figurant dans le formulaire incluent plusieurs positions (actions ordinaires et positions dérivées), les totaux d'actions sous-jacentes aux dérivés étant 6 320 et 13 051, avec une propriété bénéficiaire agrégée présentée dans le dépôt. Les RSU acquièrent selon un calendrier étalé sur quatre ans décrit dans les explications. Le formulaire a été signé par un mandataire le 20/08/2025.

William D. McCombe, Chief Financial Officer und Director von Cytek Biosciences, Inc. (CTKB), meldete Änderungen des wirtschaftlichen Eigentums im Zusammenhang mit dem Vesting von Restricted Stock Units am 18.08.2025.

Die Einreichung weist zwei Vesting-Ereignisse aus, die als Erwerb von 6.320 bzw. 13.051 RSUs (jeweils in eine Aktie wandelbar) verbucht wurden. Zur Deckung der steuerlichen Einbehalte beim Vesting einbehaltene Aktien betrugen 2.462 bzw. 5.084 zu einem Kurs von $4,06 je Aktie. In den nach der Transaktion ausgewiesenen Beständen im Formular sind mehrere Salden (Stammaktien und derivativen Positionen) aufgeführt; die zugrundeliegenden Derivat-Aktien summieren sich auf 6.320 und 13.051 und es wird ein aggregierter wirtschaftlicher Besitz angegeben. Die RSUs vesten über vier Jahre nach dem im Bericht beschriebenen Zeitplan. Das Formular wurde am 20.08.2025 von einem Bevollmächtigten unterschrieben.

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
McCombe William D.

(Last) (First) (Middle)
C/O CYTEK BIOSCIENCES, INC.
47215 LAKEVIEW BOULEVARD

(Street)
FREMONT CA 94538

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Cytek Biosciences, Inc. [ CTKB ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Financial Officer
3. Date of Earliest Transaction (Month/Day/Year)
08/18/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/18/2025 M 6,320 A (1) 62,066 D
Common Stock 08/18/2025 F 2,462(2) D $4.06 59,604 D
Common Stock 08/18/2025 M 13,051 A (1) 72,655 D
Common Stock 08/18/2025 F 5,084(2) D $4.06 67,571 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (1) 08/18/2025 M 6,320 (3) (3) Common Stock 6,320 $0 69,529 D
Restricted Stock Units (1) 08/18/2025 M 13,051 (4) (4) Common Stock 13,051 $0 187,065 D
Explanation of Responses:
1. Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.
2. 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.
3. 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.
4. 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.
/s/ Valerie Barnett, Attorney-in-Fact 08/20/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did CTKB insider William D. McCombe report on the Form 4?

He reported the vesting of 6,320 and 13,051 restricted stock units on 08/18/2025 and related withheld shares for taxes.

How many shares were withheld for taxes and at what price?

The issuer withheld 2,462 and 5,084 shares on 08/18/2025 at a per-share price of $4.06.

What is William McCombe's relationship to CTKB?

The form lists him as a Director and the company's Chief Financial Officer.

Does the Form 4 show any open-market sales by the reporting person?

No open-market sales are reported; dispositions shown relate to share withholding to satisfy tax obligations.

What is the vesting schedule described for the RSUs?

The RSUs vest over four years with specific fractional vesting on May, August, November, and March dates as detailed in the filing.
Cytek Biosciences, Inc.

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