McCombe William D. — SEC Form 4 filings
SEC reporting owner CIK 1878824. 9 Form 4 filings on record with FilingPulse; latest filed 2026-08-20.
Transaction summary — filings shown
Covers all 9 filings on record, filed 2024-05-15 to 2026-08-20. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 1 leg across 1 filing — 35,000 shares, $97,300 total (shares × price as filed).
- Open-market sales (code S, non-derivative): none reported.
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 48.
- Largest priced transaction: purchase of 35,000 shares @ $2.78 ($97,300) in Cytek Biosciences, Inc., filed 2025-06-03.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | 9 | 1 leg · 35,000 sh · $97,300 | — | 48 |
Form 4 filings — McCombe William D.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-20 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 6,320 · Tax withholding (F): 2,111 @ $4.67 · Option exercise (M): 13,051 · Tax withholding (F): 4,392 @ $4.67 · Option exercise (M): 16,049 · Tax withholding (F): 5,401 @ $4.67 · +3 more | EDGAR |
| 2026-05-20 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 6,320 · Tax withholding (F): 2,268 @ $3.55 · Option exercise (M): 8,700 · Tax withholding (F): 3,122 @ $3.55 · Option exercise (M): 10,699 · Tax withholding (F): 3,839 @ $3.55 · +3 more | EDGAR |
| 2026-03-12 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 6,320 · Tax withholding (F): 2,603 @ $4.23 · Option exercise (M): 17,401 · Tax withholding (F): 7,145 @ $4.23 · Grant/award (A): 136,205 (derivative) @ $0 · Grant/award (A): 256,790 (derivative) @ $0 · +2 more | EDGAR |
| 2025-11-20 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 6,320 · Tax withholding (F): 2,032 @ $5.53 · Option exercise (M): 13,051 · Tax withholding (F): 4,196 @ $5.53 · Option exercise (M): 6,320 (derivative) @ $0 · Option exercise (M): 13,051 (derivative) @ $0 | EDGAR |
| 2025-08-20 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 6,320 · Tax withholding (F): 2,462 @ $4.06 · Option exercise (M): 13,051 · Tax withholding (F): 5,084 @ $4.06 · Option exercise (M): 6,320 (derivative) @ $0 · Option exercise (M): 13,051 (derivative) @ $0 | EDGAR |
| 2025-06-03 | 4 | Cytek Biosciences, Inc. (CTKB) | Purchase (P): 35,000 @ $2.78 | EDGAR |
| 2025-05-21 | 4 | Cytek Biosciences, Inc. (CTKB) | Option exercise (M): 25,283 · Tax withholding (F): 9,848 @ $2.69 · Option exercise (M): 8,700 · Tax withholding (F): 3,389 @ $2.69 · Option exercise (M): 25,283 (derivative) @ $0 · Option exercise (M): 8,700 (derivative) @ $0 | EDGAR |
| 2025-03-06 | 4 | Cytek Biosciences, Inc. (CTKB) | Grant/award (A): 330,882 (derivative) @ $0 · Grant/award (A): 208,816 (derivative) @ $0 | EDGAR |
| 2024-05-15 | 4 | Cytek Biosciences, Inc. (CTKB) | Grant/award (A): 150,602 (derivative) @ $0 · Grant/award (A): 101,132 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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