Cytek (CTKB) Insider Report: Multiple RSU Vests and Tax-Withholding Details
Rhea-AI Filing Summary
Insider transactions by Cytek Biosciences (CTKB): The company's President and CEO and a director, Jiang Wenbin, reported multiple transactions on 08/18/2025 relating to Restricted Stock Units (RSUs) that vested. Several RSU awards converted into shares: 6,758; 11,781; 22,100; and 29,002 RSUs were reported as vested and credited as common stock. To satisfy tax withholding on the vesting, the issuer withheld and surrendered shares in amounts of 1,646; 2,869; 5,382; and 7,062 at an indicated price of $4.06 per share. After these transactions, the filing shows beneficial ownership tallies following each line, with reported direct ownership figures such as 5,321,479 shares following the largest aggregation. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.
Positive
- Reporting person holds both President/CEO and Director roles, indicating alignment of management and board interests as disclosed
- RSU vesting reflects ongoing executive compensation/retention mechanisms with multiple tranches converting to common stock
Negative
- Shares were withheld and surrendered to satisfy tax obligations (1,646; 2,869; 5,382; 7,062 shares) which reduces net share increases to the reporting person
- Filing does not show open-market purchases that would increase insider ownership beyond vesting
Insights
TL;DR: Routine executive equity vesting and share-withholding for taxes; no sale or acquisition for cash beyond withholding.
The filing documents scheduled vesting of multiple RSU awards for the President and CEO who is also a director, converting RSUs into common stock on 08/18/2025. The transactions include share withholding to satisfy tax obligations at $4.06 per share for specified lots. This is a standard compensation-related disclosure rather than a market-driven buy/sell signal. Reported post-transaction beneficial ownership levels are provided, indicating continued significant direct ownership by the reporting person.
TL;DR: Material only as insider compensation reporting; no cash sales or new purchases beyond tax-withholding reported.
The data shows conversion of RSUs into shares in several tranches and corresponding surrender of shares to cover withholding. The withholding was executed at $4.06 per share for the disclosed withheld amounts. There are no open-market purchase or sale transactions reported (no proceeds noted), so immediate market-impact implications are limited. This disclosure informs stakeholders about executive equity dilution and insider ownership levels.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Units | 6,758 | $0.00 | -- |
| Exercise | Restricted Stock Units | 11,781 | $0.00 | -- |
| Exercise | Restricted Stock Units | 22,100 | $0.00 | -- |
| Exercise | Restricted Stock Units | 29,002 | $0.00 | -- |
| Exercise | Common Stock | 6,758 | $0.00 | -- |
| Tax Withholding | Common Stock | 1,646 | $4.06 | $7K |
| Exercise | Common Stock | 11,781 | $0.00 | -- |
| Tax Withholding | Common Stock | 2,869 | $4.06 | $12K |
| Exercise | Common Stock | 22,100 | $0.00 | -- |
| Tax Withholding | Common Stock | 5,382 | $4.06 | $22K |
| Exercise | Common Stock | 29,002 | $0.00 | -- |
| Tax Withholding | Common Stock | 7,062 | $4.06 | $29K |
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 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. 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. 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.
