Form 4 for CTKB Cytek Biosciences, Inc.
Accepted 2026-06-12 19:22:00 ET · period of report 2026-06-10 · accession 0001515140-26-000003 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-06-12 19:22 | 2026-06-10 | CTKB | Holder Michael | Dir | M - OptEx | — | +44.0K | 60.7K | +263% | — |
| DM | 2026-06-12 19:22 | 2026-06-10 | CTKB | Holder Michael | Dir | A - Grant | $0.00 | +51.6K | 18.3K | New | $0 |
| D | 2026-06-12 19:22 | 2026-06-10 | CTKB | Holder Michael | Dir | M - OptEx | $0.00 | -44.0K | 0 | -100% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-06-10 | M | A | 43,973 | — | 60,694 | D | — | — | (F1) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. |
| 2 | Derivative | Restricted Stock Units | 2026-06-10 | A | A | 33,333 | $0.00 | 33,333 | D | — · — to — | 33,333 Common Stock | (F1) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. (F2) 100% of the shares subject to the RSU Award shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027). (F2) 100% of the shares subject to the RSU Award shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027). |
| 3 | Derivative | Director Stock Option (right to buy) | 2026-06-10 | A | A | 18,261 | $0.00 | 18,261 | D | $4.05 · — to 2036-06-10 | 18,261 Common Stock | (F3) 100% of the shares subject to the option shall vest on the earlier of June 10, 2027 and the date of the Issuer's 2027 annual meeting of stockholders (provided such meeting is held in June 2027). |
| 4 | Derivative | Restricted Stock Units | 2026-06-10 | M | D | 43,973 | $0.00 | 0 | D | — · — to — | 43,973 Common Stock | (F1) Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. (F4) 100% of the shares subject to the RSU Award vested on June 10, 2026. (F4) 100% of the shares subject to the RSU Award vested on June 10, 2026. |