Busque Philippe 4
4 · Cytek Biosciences, Inc. · Filed May 20, 2026
Research Summary
AI-generated summary of this filing
Cytek (CTKB) SVP Philippe Busque Receives RSU Shares; Shares Surrendered
What Happened
Philippe Busque, Senior VP, Global Sales and Services at Cytek Biosciences (CTKB), had multiple RSU awards convert to common stock on May 18, 2026. A total of 10,464 shares were acquired upon conversion/vesting (1,024 + 1,473 + 2,416 + 5,551). To satisfy withholding tax obligations, 2,685 of those shares were surrendered to the issuer (disposed) at $3.55 per share, for reported value of $9,532. The filing was submitted on May 20, 2026.
Key Details
- Transaction date: May 18, 2026; Form 4 filed May 20, 2026 (timely filing).
- Shares acquired (conversion/vesting of RSUs): 10,464 shares.
- Shares surrendered for tax withholding: 2,685 shares at $3.55/share = $9,532.
- Footnotes: F1–F6 indicate these were Restricted Stock Units (RSUs), each converting to one share; the withheld shares were surrendered to the issuer to satisfy tax withholding; multiple RSU awards have staggered 4‑year vesting schedules as detailed in the filing.
- Shares owned after the transaction: not stated in the Form 4 filing.
Context
This was not an open-market sale or purchase — it reflects the routine conversion/vesting of RSUs and a cashless-style withholding of shares to cover taxes. For retail investors, such tax-withholding disposals are common and typically do not signal a deliberate sale of shares for investment reasons. The entries labeled as derivative conversions with $0.00 reflect the RSU-to-share conversion rather than a paid option exercise.
Insider Transaction Report
- Exercise/Conversion
Common Stock
[F1]2026-05-18+1,024→ 36,711 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−263$934→ 36,448 total - Exercise/Conversion
Common Stock
[F1]2026-05-18+1,473→ 37,921 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−378$1,342→ 37,543 total - Exercise/Conversion
Common Stock
[F1]2026-05-18+2,416→ 39,959 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−620$2,201→ 39,339 total - Exercise/Conversion
Common Stock
[F1]2026-05-18+5,551→ 44,890 total - Tax Payment
Common Stock
[F2]2026-05-18$3.55/sh−1,424$5,055→ 43,466 total - Exercise/Conversion
Restricted Stock Units
[F1][F3]2026-05-18−1,024→ 5,641 total→ Common Stock (1,024 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F4]2026-05-18−1,473→ 16,209 total→ Common Stock (1,473 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F5]2026-05-18−2,416→ 41,089 total→ Common Stock (2,416 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F6]2026-05-18−5,551→ 127,675 total→ Common Stock (5,551 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 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.
- [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 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.