Busque Philippe 4
4 · Cytek Biosciences, Inc. · Filed Mar 12, 2026
Research Summary
AI-generated summary of this filing
Cytek (CTKB) SVP Philippe Busque Receives RSUs, Exercises Options
What Happened Philippe Busque, SVP, Global Sales and Services at Cytek Biosciences (CTKB), had restricted stock units (RSUs) and derivative awards vest/convert on March 10, 2026. The filing shows grants/awards of 70,665 and 133,226 RSUs (total 203,891 RSUs, recorded as acquired at $0) and the conversion/exercise of three derivative lots totaling 9,828 shares (2,049 + 2,946 + 4,833). To satisfy tax withholding arising from vesting, 635 + 912 + 1,496 = 3,043 shares were withheld and surrendered to the issuer at $4.23 per share, totaling $12,872. There is no indication of an open-market sale — the withheld shares were used to cover taxes.
Key Details
- Transaction date: March 10, 2026; Form 4 filed March 12, 2026 (within the normal 2‑business‑day window).
- Awards/Acquisitions: 70,665 RSUs and 133,226 RSUs (acquired at $0; RSUs are contingent rights to one share each — see footnote F1).
- Exercises/Conversions: 2,049; 2,946; and 4,833 derivative shares converted/exercised (total 9,828).
- Tax withholding (code F): 635; 912; and 1,496 shares withheld at $4.23/share, totaling $12,872 (footnote F2).
- Shares owned after the transactions: Not specified in the provided excerpt of the filing.
- Notable footnotes: RSUs convert to one share each (F1); withheld shares were surrendered to satisfy tax liabilities on the RSU vesting (F2); various footnotes (F3–F7) describe multi‑year vesting schedules for the options and RSU awards.
- Transaction codes: A = Award/Grant; M = Option exercise/conversion; F = Payment of exercise price or tax withholding.
Context
- This filing shows awards vesting and derivative conversions with share withholding for taxes — not an open‑market sale or purchase. Withholding to cover taxes is a routine administrative step and does not necessarily signal insider sentiment.
- For clarity: “M” entries indicate exercise/conversion of derivatives (options or vested RSUs); the withheld shares (F) are the issuer withholding shares to cover tax obligations rather than a market sale.
Insider Transaction Report
Form 4
Busque Philippe
SVP, GLOBAL SALES AND SERVICES
Transactions
- Exercise/Conversion
Common Stock
[F1]2026-03-10+2,049→ 30,951 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−635$2,686→ 30,316 total - Exercise/Conversion
Common Stock
[F1]2026-03-10+2,946→ 33,262 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−912$3,858→ 32,350 total - Exercise/Conversion
Common Stock
[F1]2026-03-10+4,833→ 37,183 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−1,496$6,328→ 35,687 total - Award
Employee Stock Option (right to buy)
[F3]2026-03-10+70,665→ 70,665 totalExercise: $4.23Exp: 2036-03-09→ Common Stock (70,665 underlying) - Award
Restricted Stock Units
[F1][F4]2026-03-10+133,226→ 133,226 total→ Common Stock (133,226 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F5]2026-03-10−2,049→ 6,665 total→ Common Stock (2,049 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F6]2026-03-10−2,946→ 17,682 total→ Common Stock (2,946 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F7]2026-03-10−4,833→ 43,505 total→ Common Stock (4,833 underlying)
Footnotes (7)
- [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 March 10, 2026, to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.
- [F3]The shares subject to the stock option shall vest over 4 years with 1/48 of the total shares underlying the stock option vesting on April 10, 2026 and each month 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, 2026 and each May 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting August 18, 2026 and each August 18 thereafter; 3/48 of the total shares underlying the RSU Award vesting 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.
- [F5]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.
- [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, 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.
- [F7]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.
Signature
/s/ Valerie Barnett, Attorney-in-Fact|2026-03-12