William D. McCombe
CIK: 0001878824
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Cytek Biosciences, Inc.
Discretionary Trading P&L
Holdings
Transaction History (33 total)
- Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct2.1K shares at avg. $4.67$10K - Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct13.1K shares- - Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct4.4K shares at avg. $4.67$21K - Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct5.4K shares at avg. $4.67$25K - Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct16K shares- - Aug 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct6.3K shares- - May 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct8.7K shares- - May 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct10.7K shares- - May 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct3.8K shares at avg. $3.55$14K - May 18, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct6.3K shares- - May 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct2.3K shares at avg. $3.55$8K - May 18, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct3.1K shares at avg. $3.55$11K - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct2.6K shares at avg. $4.23$11K - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct17.4K shares- - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct7.1K shares at avg. $4.23$30K - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Award(A)DirectRestricted Stock Units
256.8K shares- - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Award(A)DirectEmployee Stock Option (right to buy)
136.2K shares- - Mar 10, 2026CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct6.3K shares- - Nov 18, 2025CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct6.3K shares- - Nov 18, 2025CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct13.1K shares- - Nov 18, 2025CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct4.2K shares at avg. $5.53$23K - Nov 18, 2025CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct2K shares at avg. $5.53$11K - Aug 18, 2025CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct6.3K shares- - Aug 18, 2025CTKB
Cytek Biosciences, Inc.
Tax Payment(F)Direct2.5K shares at avg. $4.06$10K - Aug 18, 2025CTKB
Cytek Biosciences, Inc.
Exercise(M)Direct13.1K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 2,111 | $4.67 | $9,858 | Direct |
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 13,051 | - | $0 | Direct |
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 4,392 | $4.67 | $20,511 | Direct |
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 5,401 | $4.67 | $25,223 | Direct |
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 16,049 | - | $0 | Direct |
| Aug 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 6,320 | - | $0 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 8,700 | - | $0 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 10,699 | - | $0 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 3,839 | $3.55 | $13,628 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 6,320 | - | $0 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 2,268 | $3.55 | $8,051 | Direct |
| May 18, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 3,122 | $3.55 | $11,083 | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 2,603 | $4.23 | $11,011 | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 17,401 | - | $0 | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 7,145 | $4.23 | $30,223 | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Award(A) Restricted Stock Units | 256,790 | - | - | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Award(A) Employee Stock Option (right to buy) | 136,205 | - | - | Direct |
| Mar 10, 2026 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 6,320 | - | $0 | Direct |
| Nov 18, 2025 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 6,320 | - | - | Direct |
| Nov 18, 2025 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 13,051 | - | - | Direct |
| Nov 18, 2025 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 4,196 | $5.53 | $23,204 | Direct |
| Nov 18, 2025 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 2,032 | $5.53 | $11,237 | Direct |
| Aug 18, 2025 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 6,320 | - | - | Direct |
| Aug 18, 2025 | CTKB Cytek Biosciences, Inc. | Tax Payment(F) | 2,462 | $4.06 | $9,996 | Direct |
| Aug 18, 2025 | CTKB Cytek Biosciences, Inc. | Exercise(M) | 13,051 | - | - | Direct |
1-25 of 33 transactions
About McCombe William D.
McCombe William D. (SEC CIK 0001878824) files insider reports with the SEC as Chief Financial Officer of Cytek Biosciences, Inc. (CTKB).
Signal8 holds 8 ownership filings by McCombe William D., all Form 4s, filed between Mar 6, 2025 and Aug 20, 2026. Those filings report 33 transactions, from Mar 4, 2025 to Aug 18, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on McCombe William D.'s filings is in FREMONT, CA.
Recent filings by McCombe William D.
- Aug 18, 2026: Tax withholding of CTKB shares (Form 4, code F).
- Aug 18, 2026: Option exercise of CTKB shares (Form 4, code M).
- Aug 18, 2026: Tax withholdings of CTKB shares (2 lines, Form 4, code F).
- Aug 18, 2026: Option exercises of CTKB shares (2 lines, Form 4, code M).
- May 18, 2026: Option exercises of CTKB shares (2 lines, Form 4, code M).
Other insiders filing for Cytek Biosciences, Inc. (CTKB)
- Jiang Wenbin, PRESIDENT AND CEO
- MUIR GLENN P, Director
- Holder Michael, Director
- Chin Richard, Director
- Yan Ming, CHIEF TECHNOLOGY OFFICER
- Feuchtwang Ilan, Chief Legal Officer, Secretary