Thurmond Mark C. (CIK 1651579) reported 56 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-02-27). Recent activity: Buy TENB (24,381 shares), Sell TENB (11,789 shares), Buy TENB (46,586 shares), Sell TENB (401 shares), Buy TENB (1,162 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-27 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 24,381 | $0 |
| 2026-02-27 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 11,789 | $223,991 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 46,586 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 401 | $7,038 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 1,162 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 342 | $6,002 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 2,267 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 666 | $11,688 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 3,857 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 1,865 | $32,731 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 3,713 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 1,090 | $19,130 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 1,365 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 15,635 | $274,394 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 4,368 | $0 |
| 2026-02-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 1,283 | $22,517 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 1,363 | $0 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 660 | $16,949 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 1,162 | $0 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 562 | $14,432 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 2,267 | $0 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 1,097 | $28,171 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 3,857 | $0 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Sell | 1,865 | $47,893 |
| 2025-11-25 | Tenable Holdings, Inc. (TENB) | Co-Chief Executive Officer | Buy | 3,713 | $0 |
Source: SEC Form 4 filings · as of 2026-02-27