McCombe William D. (CIK 1878824) reported 23 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-20). Recent activity: Buy CTKB (6,320 shares), Sell CTKB (2,268 shares), Buy CTKB (8,700 shares), Sell CTKB (3,122 shares), Buy CTKB (10,699 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 6,320 | $0 |
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 2,268 | $8,051 |
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 8,700 | $0 |
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 3,122 | $11,083 |
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 10,699 | $0 |
| 2026-05-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 3,839 | $13,628 |
| 2026-03-12 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 6,320 | $0 |
| 2026-03-12 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 2,603 | $11,011 |
| 2026-03-12 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 17,401 | $0 |
| 2026-03-12 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 7,145 | $30,223 |
| 2025-11-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 6,320 | $0 |
| 2025-11-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 2,032 | $11,237 |
| 2025-11-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 13,051 | $0 |
| 2025-11-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 4,196 | $23,204 |
| 2025-08-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 6,320 | $0 |
| 2025-08-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 2,462 | $9,996 |
| 2025-08-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 13,051 | $0 |
| 2025-08-20 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 5,084 | $20,641 |
| 2025-06-03 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 35,000 | $97,300 |
| 2025-05-21 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 25,283 | $0 |
| 2025-05-21 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 9,848 | $26,491 |
| 2025-05-21 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Buy | 8,700 | $0 |
| 2025-05-21 | Cytek Biosciences, Inc. (CTKB) | Chief Financial Officer | Sell | 3,389 | $9,116 |
Source: SEC Form 4 filings · as of 2026-05-20