Cytek (CTKB) Insider Filing: RSU Conversions Increase Ownership, Shares Withheld
Rhea-AI Filing Summary
Insider Form 4 for Cytek Biosciences, Inc. (CTKB) reports that Philippe Busque, SVP, Global Sales and Services and a director, had multiple restricted stock unit (RSU) vesting events on 08/18/2025 that increased his beneficial ownership. A series of RSU awards converted into common shares: 1,536; 2,210; and 3,625 RSUs became vested and reflected as acquired shares. The filing also shows withholding/surrender of shares to satisfy tax obligations related to the vesting, reducing net share additions.
Positive
- RSU vesting increased insider beneficial ownership by the conversion of 1,536, 2,210, and 3,625 RSUs into common shares on 08/18/2025
Negative
- Shares were withheld/surrendered to satisfy tax obligations (599, 861, and 1,412 shares), reducing the net increase in shares held
Insights
TL;DR: Routine executive RSU vesting increased insider ownership while some shares were withheld for taxes.
This Form 4 documents scheduled vesting of multiple RSU awards for a senior officer/director, resulting in the conversion of RSUs into common stock on 08/18/2025. Vesting events are standard compensation fulfillment rather than open-market purchases or sales. The filing discloses shares withheld and surrendered to the issuer to cover tax withholding obligations, which is a common practice and reduces net share additions. There is no indication of open-market trading or changes in control.
TL;DR: The transactions are procedurally material for share count but carry no new operational or financial information.
The reported transactions show RSU-to-share settlements increasing the reporting person’s beneficial ownership in measured increments: 1,536, 2,210, and 3,625 shares credited from RSU vesting. Offsetting these, the filer surrendered 599, 861, and 1,412 shares to satisfy tax withholdings at a price of $4.06 per share as disclosed. These entries affect insider ownership disclosures and outstanding share composition but do not convey company performance updates.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Units | 1,536 | $0.00 | -- |
| Exercise | Restricted Stock Units | 2,210 | $0.00 | -- |
| Exercise | Restricted Stock Units | 3,625 | $0.00 | -- |
| Exercise | Common Stock | 1,536 | $0.00 | -- |
| Tax Withholding | Common Stock | 599 | $4.06 | $2K |
| Exercise | Common Stock | 2,210 | $0.00 | -- |
| Tax Withholding | Common Stock | 861 | $4.06 | $3K |
| Exercise | Common Stock | 3,625 | $0.00 | -- |
| Tax Withholding | Common Stock | 1,412 | $4.06 | $6K |
Footnotes (1)
- Each Restricted Stock Unit (the "RSU Award") represents a contingent right to receive one share of the Issuer's common stock. 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. The shares subject to the RSU Award shall vest over four years with 13/48 of the total shares underlying the RSU Award vesting on May 18, 2024; 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; 4/48 of the total shares underlying the RSU Award vesting on March 10, 2025 and each March 10 thereafter; and 2/48 of the total shares underlying the RSU Award vesting on May 18, 2025 and each May 18 thereafter. 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. 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.
