Yan Ming 4
4 · Cytek Biosciences, Inc. · Filed Mar 12, 2026
Research Summary
AI-generated summary of this filing
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).
Insider Transaction Report
Form 4
Yan Ming
DirectorCHIEF TECHNOLOGY OFFICER
Transactions
- Exercise/Conversion
Common Stock
[F1]2026-03-10+9,817→ 6,084,081 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−3,047$12,889→ 6,081,034 total - Exercise/Conversion
Common Stock
[F1]2026-03-10+7,366→ 6,088,400 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−2,287$9,674→ 6,086,113 total - Exercise/Conversion
Common Stock
[F1]2026-03-10+8,217→ 6,094,330 total - Tax Payment
Common Stock
[F2]2026-03-10$4.23/sh−2,397$10,139→ 6,091,933 total - Award
Employee Stock Option (right to buy)
[F3]2026-03-10+120,688→ 120,688 totalExercise: $4.23Exp: 2036-03-09→ Common Stock (120,688 underlying) - Award
Restricted Stock Units
[F1][F4]2026-03-10+227,535→ 227,535 total→ Common Stock (227,535 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F5]2026-03-10−9,817→ 29,460 total→ Common Stock (9,817 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F6]2026-03-10−7,366→ 44,203 total→ Common Stock (7,366 underlying) - Exercise/Conversion
Restricted Stock Units
[F1][F7]2026-03-10−8,217→ 73,958 total→ Common Stock (8,217 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 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.
- [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