Cytek CTO vests 33,270 shares; 8,088 withheld
Cytek Biosciences, Inc. (CTKB) reported that director and Chief Technology Officer Yan Ming had several Restricted Stock Unit ("RSU Award") tranches vest on August 18, 2026, each RSU converting into one share of common stock.
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Form Type
4
Rhea-AI Filing Summary
Cytek Biosciences, Inc. (CTKB) reported that director and Chief Technology Officer Yan Ming had several Restricted Stock Unit ("RSU Award") tranches vest on August 18, 2026, each RSU converting into one share of common stock. In total, 33,270 shares of common stock were acquired through exercises or conversions of RSUs. To cover related tax obligations, 8,088 shares of common stock were withheld and surrendered to Cytek at $4.67 per share. The RSU Awards vest over four-year schedules, with specified fractions of the total shares vesting on May 18, August 18, November 18, and March 10 of each year for the different grants.
Insider Trade Summary
33,270 shares exercised/converted
Exercise
12 txns
Insider
Yan Ming
Role
CHIEF TECHNOLOGY OFFICER
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Restricted Stock Units F1, F3 | 7,363 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units F1, F4 | 5,525 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units F1, F5 | 6,162 | $0.00 | $0.00 |
| Exercise | Restricted Stock Units F1, F6 | 14,220 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 7,363 | -- | -- |
| Tax Withholding | Common Stock F2 | 1,778 | $4.67 | $8K |
| Exercise | Common Stock F1 | 5,525 | -- | -- |
| Tax Withholding | Common Stock F2 | 1,346 | $4.67 | $6K |
| Exercise | Common Stock F1 | 6,162 | -- | -- |
| Tax Withholding | Common Stock F2 | 1,501 | $4.67 | $7K |
| Exercise | Common Stock F1 | 14,220 | -- | -- |
| Tax Withholding | Common Stock F2 | 3,463 | $4.67 | $16K |
Holdings After Transaction:
Restricted Stock Units — 319,707 contracts (Direct);
Common Stock — 4,821,870 shares (Direct)
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 August 18, 2026 to satisfy tax withholding obligations that arose in connection with the vesting of the RSU Award.
- F3. The shares underlying 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.
- F4. The shares underlying 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 underlying 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.
- F6. The shares underlying 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.
Key Figures
Shares acquired via RSU vesting: 33,270 shares of common stock
Shares withheld for taxes: 8,088 shares of common stock
Tax withholding price: $4.67 per share
+4 more
7 metrics
Shares acquired via RSU vesting
33,270 shares of common stock
Total derivative exercises or conversions (RSU Awards) on August 18, 2026
Shares withheld for taxes
8,088 shares of common stock
Code F tax-withholding dispositions on August 18, 2026
Tax withholding price
$4.67 per share
Per-share value for common stock withheld to satisfy tax obligations
RSU exercise count
4 derivative exercises
Number of RSU-related exercise or conversion transactions (code M)
RSU vesting term
4 years
Each RSU Award vests over four years in scheduled installments
Tax-withholding transactions
4 transactions
Code F entries for payment of tax liability by withholding securities
Net buy/sell share impact
0 shares
Net buy/sell direction reported as neutral across all transactions
Key Terms
Restricted Stock Units, tax withholding obligations, derivative security, Payment of tax liability by delivering or withholding securities
4 terms
Restricted Stock Units financial
"Each Restricted Stock Unit (the "RSU Award") represents a contingent right"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
tax withholding obligations financial
"surrendered to the Issuer on August 18, 2026 to satisfy tax withholding obligations"
derivative security financial
"transaction code description: Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
Payment of tax liability by delivering or withholding securities financial
"transaction code description: Payment of tax liability by delivering or withholding securities"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What transactions did Yan Ming report in this Form 4 for CTKB?
Yan Ming reported multiple RSU Award vestings on August 18, 2026, converting into 33,270 shares of Cytek Biosciences common stock, with a portion of shares then withheld to satisfy tax obligations.
What is the vesting schedule of Yan Ming’s RSU Awards at Cytek Biosciences (CTKB)?
Each RSU Award vests over 4 years, with portions of the total shares vesting on May 18, August 18, November 18, and March 10 each year, according to detailed 48-part fraction schedules for each grant.
What roles does Yan Ming hold at Cytek Biosciences (CTKB)?
Yan Ming is reported as both a director and an officer of Cytek Biosciences, Inc., serving as Chief Technology Officer.
AI-generated analysis. How Rhea-AI works. Not financial advice.
