Mark C. Thurmond
Co-Chief Executive Officer at Tenable Holdings Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 2 years
- Director since
- 2025
2 years of board service in total across 1 board, counting each seat separately. Longest: Tenable Holdings Inc., 1 year.
Chief executive roles
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +1,162 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −562 | $33.94 | $19,074 |
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +2,267 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −1,097 | $33.94 | $37,232 |
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +6,095 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −2,947 | $33.94 | $100,021 |
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +3,713 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −1,796 | $33.94 | $60,956 |
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +7,764 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −3,754 | $33.94 | $127,411 |
| Aug 24, 2026 | Tenable Holdings Inc. | Option exercise | +4,368 | — | — |
| Aug 24, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −2,112 | $33.94 | $71,681 |
| May 22, 2026 | Tenable Holdings Inc. | Option exercise | +1,162 | — | — |
| May 22, 2026 | Tenable Holdings Inc. | Shares withheld for tax | −562 | $25.45 | $14,303 |
| May 22, 2026 | Tenable Holdings Inc. | Option exercise | +2,267 | — | — |
Questions about Mark C. Thurmond
What boards is Mark C. Thurmond on?
Mark C. Thurmond sits on the board of Tenable Holdings Inc.
What company is Mark C. Thurmond the CEO of?
Mark C. Thurmond is Co-Chief Executive Officer of Tenable Holdings Inc.
How long has Mark C. Thurmond served on boards?
Our records show at least 2 years of board service across 1 board, the earliest from 2025.
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