Cytek (CTKB) Form 4: CTO Yan Ming RSUs Vest, Ownership Reaches 6.06M
Cytek Biosciences director and Chief Technology Officer Yan Ming reported multiple Form 4 transactions on 08/18/2025 related to the vesting of Restricted Stock Units (RSUs).
Rhea-AI Filing Summary
Cytek Biosciences director and Chief Technology Officer Yan Ming reported multiple Form 4 transactions on 08/18/2025 related to the vesting of Restricted Stock Units (RSUs). The filings show vesting events that increased Mr. Yan's direct beneficial ownership to 6,058,887 shares of common stock after the reported transactions. Several tranches vested on 08/18/2025 totaling 20,?231 RSUs (1,981 + 7,363 + 5,525 + 6,162) and certain shares were withheld to satisfy tax withholding obligations at a price of $4.06 per share for the withheld amounts. The RSU awards follow multi‑year vesting schedules described in the explanation, with quarterly or annual vesting components.
Positive
- Insider beneficial ownership reported at 6,058,887 shares, indicating significant alignment with shareholders
- RSU vesting schedules are clearly disclosed with specific vesting cadence for transparency
Negative
- Shares were withheld to satisfy tax obligations (various small amounts), reducing the net increase in outstanding shares received by the insider
Insights
TL;DR: Routine RSU vesting and tax-withholding transactions increased direct holdings to ~6.06M shares; no sales or option exercises reported.
The Form 4 reflects customary equity compensation mechanics: multiple RSU tranches vested on 08/18/2025, increasing direct ownership to 6,058,887 shares. Portions of vested shares were surrendered to the issuer to satisfy tax withholding, reported at $4.06 per share. These are non‑derivative, non‑sale events (transaction codes M and F) and do not indicate monetization or change in control. Impact on float and dilution is incremental and tied to planned compensation schedules rather than discretionary trading.
TL;DR: Disclosure is standard for an officer/director receiving RSU vesting; documentation of vesting schedule and withholding is clear and complete.
The filing properly discloses the nature of the awards, vesting cadence, and tax withholding actions. Vesting schedules are specified for each RSU grant, including quarterly and annual tranches, which supports transparency around insider accumulation. There is no indication of Rule 10b5-1 trading plan usage or unusual related‑party transactions. From a governance perspective, these are routine equity compensation disclosures.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Units | 1,981 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units | 7,363 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units | 5,525 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units | 6,162 | $0.00 | $0.00 |
| Exercise | Common Stock | 1,981 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 588 | $4.06 | $2K |
| Exercise | Common Stock | 7,363 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 2,184 | $4.06 | $9K |
| Exercise | Common Stock | 5,525 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 1,498 | $4.06 | $6K |
| Exercise | Common Stock | 6,162 | $0.00 | $0.00 |
| Exercise Price or Tax Liability | Common Stock | 1,468 | $4.06 | $6K |
Footnotes (6)
- F1. Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock.
- F2. 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.
- F3. The shares subject to the RSU Award shall vest quarterly over four years, with 4/48th of the total shares underlying the RSU Award vesting on May 18, 2022 and 3/48th of the total shares underlying the RSU Award vesting each subsequent quarter thereafter on August 18, November 18, February 18 and May 18.
- F4. 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, 2023 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2023 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2023 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2024 and each March 10 thereafter, until fully vested.
- F5. 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, 2024 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2024 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2024 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter.
- F6. 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.
FAQ
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What transactions did Yan Ming report on Form 4 for CTKB?
Do the filings indicate a trading plan under Rule 10b5-1?
What is the nature of the reported RSU awards?
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