Form 4 for CTKB Cytek Biosciences, Inc.
Accepted 2026-08-20 16:31:29 ET · period of report 2026-08-18 · accession 0001181190-26-000007 · 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 | 2026-08-20 16:31 | 2026-08-18 | CTKB | MUIR GLENN P | Dir | M - OptEx | — | +3,086 | 3,086 | New | — |
| D | 2026-08-20 16:31 | 2026-08-18 | CTKB | MUIR GLENN P | Dir | M - OptEx | $0.00 | -3,086 | 52.5K | -6% | $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 | 2026-08-18 | M | A | 3,086 | — | 3,086 | 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 | 2026-08-18 | M | D | 3,086 | $0.00 | 52,469 | D | — · — to — | 3,086 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) The shares underlying the RSU Award shall vest over 3 years, with 2/36 of the total shares underlying the RSU Award vesting on August 18, 2026; 3/36 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; 4/36 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter; 3/36 of the total shares underlying the RSU Award vesting on May 18, 2027 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award vesting on August 18, 2027 and each August 18 thereafter. (F2) The shares underlying the RSU Award shall vest over 3 years, with 2/36 of the total shares underlying the RSU Award vesting on August 18, 2026; 3/36 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; 4/36 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter; 3/36 of the total shares underlying the RSU Award vesting on May 18, 2027 and each May 18 thereafter; and 3/36 of the total shares underlying the RSU Award vesting on August 18, 2027 and each August 18 thereafter. |