Jiang Wenbin 4
4 · Cytek Biosciences, Inc. · Filed May 20, 2026
Research Summary
AI-generated summary of this filing
Cytek (CTKB) CEO Jiang Wenbin Exercises RSUs; Shares Surrendered for Taxes
What Happened
Jiang Wenbin, President, CEO and a director of Cytek Biosciences (CTKB), had multiple Restricted Stock Units (RSUs) vest/convert on May 18, 2026, resulting in the acquisition of 80,062 shares. To satisfy tax withholding obligations, 25,542 of those shares were withheld and surrendered to the issuer for a total withholding value of $90,674 (withholding price shown as $3.55/share). The derivative-line $0 disposals reflect the conversion/settlement of RSUs into common stock rather than a cash sale.
Key Details
- Transaction date: May 18, 2026; Form 4 filed May 20, 2026 (timely filing).
- Acquired (RSU conversions): 7,854 + 14,733 + 19,334 + 38,141 = 80,062 shares.
- Withheld/surrendered for taxes: 1,913 + 3,588 + 5,032 + 15,009 = 25,542 shares; withholding price $3.55/share; total ~$90,674.
- Net shares added to beneficial ownership from these events: 80,062 − 25,542 = 54,520 shares.
- Transaction codes: M = exercise/conversion of derivative (RSU conversion), F = payment of tax liability via share withholding.
- Footnotes: F1–F6 describe that these are RSUs (one RSU = one share) and detail multi‑year vesting schedules; F2 confirms shares were surrendered to satisfy tax withholding.
- Shares owned after the transaction: not specified in the filing.
Context
This was not an open‑market purchase or a sale to generate cash; it was the scheduled vesting/conversion of RSUs with shares withheld to cover taxes (a common, non‑sentiment transaction). For retail investors, note this increases the insider's net holdings by the net amount listed above, but it does not necessarily signal a bullish trading decision — it reflects compensation vesting and routine tax withholding.
Insider Transaction Report
- Exercise/Conversion
Common Stock
[F1]2026-05-18+7,854→ 5,430,537 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−1,913$6,791→ 5,428,624 total - Exercise/Conversion
Common Stock
[F2][F1]2026-05-18+14,733→ 5,443,357 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−3,588$12,737→ 5,439,769 total - Exercise/Conversion
Common Stock
[F2][F1]2026-05-18+19,334→ 5,459,103 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−5,032$17,864→ 5,454,071 total - Exercise/Conversion
Common Stock
[F1]2026-05-18+38,141→ 5,492,212 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−15,009$53,282→ 5,477,203 total - Exercise/Conversion
Restricted Stock Units
[F1][F3]2026-05-18−7,854→ 39,275 total→ Common Stock (7,854 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F4]2026-05-18−14,733→ 162,073 total→ Common Stock (14,733 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F5]2026-05-18−19,334→ 328,696 total→ Common Stock (19,334 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F6]2026-05-18−38,141→ 877,266 total→ Common Stock (38,141 underlying)
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 May 18, 2026, 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 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.
- [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, 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.
- [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, 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.
- [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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting on November 18, 2026 and each November 18 thereafter; and 4/48 of the total shares underlying the RSU Award vesting on March 10, 2027 and each March 10 thereafter, until fully vested.