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Cytek Biosciences, Inc. (NASDAQ:CTKB)
US · Delayed Price · Currency is USD
Healthcare · Medical - Devices
5.80+0.21 (+3.82%)
Insider Score
––Not scored
CTKB Insider Score
Insiders here have filed 25 Form 4s in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
CTKB Stock Insider Trading Activity
CTKB stock’s insider trading shows no open-market insider trades by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Yan Ming Director | Tax withheld | 1,501 | $4.67 | $7.01K | 0.0% | 4,811,113 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Option exercise | 14,220 | — | — | 0.3% | 4,825,333 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Tax withheld | 3,463 | $4.67 | $16.17K | 0.1% | 4,821,870 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Option exercise | 11,781 | — | — | 0.2% | 5,488,984 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Tax withheld | 2,869 | $4.67 | $13.40K | 0.1% | 5,486,115 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Option exercise | 22,100 | — | — | 0.4% | 5,508,215 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Tax withheld | 5,382 | $4.67 | $25.13K | 0.1% | 5,502,833 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Option exercise | 29,002 | — | — | 0.5% | 5,531,835 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Tax withheld | 7,062 | $4.67 | $32.98K | 0.1% | 5,524,773 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Option exercise | 57,212 | — | — | 1.0% | 5,581,985 | Aug 18, 2026 | — | Form 4 |
| Jiang Wenbin CEO | Tax withheld | 20,956 | $4.67 | $97.86K | 0.4% | 5,561,029 | Aug 18, 2026 | — | Form 4 |
| Holder Michael Director | Option exercise | 2,181 | — | — | 3.6% | 62,875 | Aug 18, 2026 | — | Form 4 |
| Chin Richard Director | Option exercise | 6,107 | — | — | 27.3% | 28,499 | Aug 18, 2026 | — | Form 4 |
| MUIR GLENN P Director | Option exercise | 3,086 | — | — | New | 3,086 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Option exercise | 7,363 | — | — | 0.2% | 4,804,051 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Tax withheld | 1,778 | $4.67 | $8.30K | 0.0% | 4,802,273 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Option exercise | 5,525 | — | — | 0.1% | 4,807,798 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Tax withheld | 1,346 | $4.67 | $6.29K | 0.0% | 4,806,452 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Option exercise | 6,162 | — | — | 0.1% | 4,812,614 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Tax withheld | 2,111 | $4.67 | $9.86K | 1.8% | 115,386 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Option exercise | 13,051 | — | — | 11.3% | 128,437 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Tax withheld | 4,392 | $4.67 | $20.51K | 3.4% | 124,045 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Option exercise | 6,320 | — | — | 5.7% | 117,497 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Option exercise | 16,049 | — | — | 12.9% | 140,094 | Aug 18, 2026 | — | Form 4 |
| McCombe William D. CFO | Tax withheld | 5,401 | $4.67 | $25.22K | 3.9% | 134,693 | Aug 18, 2026 | — | Form 4 |
| Yan Ming Director | Gift | 135,892 | — | — | 2.8% | 4,796,688 | Jun 12, 2026 | — | Form 4 |
| Ball Jack Director | Option exercise | 43,973 | — | — | 103% | 86,678 | Jun 10, 2026 | — | Form 4 |
| Imper Vera Director | Option exercise | 43,973 | — | — | 280% | 59,679 | Jun 10, 2026 | — | Form 4 |
| NEFF DEBORAH J Director | Option exercise | 43,973 | — | — | 280% | 59,679 | Jun 10, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
- Gift (G) — Bona fide gift
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.