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Cytek Biosciences, Inc.·4

Mar 12, 4:36 PM ET

Yan Ming 4

Research Summary

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Cytek (CTKB) CTO Yan Ming Receives 348k RSUs, Exercises Options

What Happened

  • Yan Ming, Chief Technology Officer and director of Cytek Biosciences (CTKB), exercised/options converted a total of 25,400 derivative shares and received two RSU awards totaling 348,223 restricted stock units on March 10, 2026. The RSUs were reported at $0.00 (award), and no open‑market sale was reported.
  • To cover tax withholding obligations related to the transactions, 7,731 shares were withheld and surrendered to the company at $4.23 per share, totaling $32,702 (3,047 shares for $12,889; 2,287 shares for $9,674; 2,397 shares for $10,139). The filings show the exercises/conversions and the withholding as routine administrative actions rather than open-market sales.

Key Details

  • Transaction date / filing: Transactions occurred on 2026-03-10; Form 4 filed 2026-03-12 (timely).
  • Shares involved:
    • Options exercised/converted: 9,817 + 7,366 + 8,217 = 25,400 shares (derivative exercises, code M).
    • RSU awards granted: 120,688 and 227,535 = 348,223 RSUs (code A), reported at $0.00.
    • Shares withheld for tax (code F): 3,047, 2,287, 2,397 = 7,731 shares at $4.23/share = $32,702 total.
  • Shares owned after transaction: Not disclosed in this filing.
  • Notable footnotes:
    • F1: Each RSU represents a contingent right to one share on vesting.
    • F2: The 7,731 shares were surrendered to the issuer to satisfy tax withholding.
    • F3–F7: Vesting schedules — options vest monthly over 4 years (1/48 monthly after a start date); RSU awards vest over 4 years with specified 2/48, 3/48 and 4/48 installments on listed dates (see footnotes for exact timing).
  • No 10b5‑1 plan or gift (G) reported.

Context

  • These transactions are acquisitions (exercise/conversion and awards), not open‑market purchases or sales. The withholding of shares to cover taxes is a common cashless feature of option/RSU settlements and does not indicate a traditional sale.
  • RSUs are subject to multi‑year vesting per the footnotes — the economic ownership is contingent on future vesting dates. For options, the filing indicates a standard multi‑year vesting schedule (monthly over four years).