Updated Jul 16, 2026
Thurmond Mark C. has filed 1 SEC Form 4 filing across 1 company in the last 90 days — selling. Lifetime open-market sales: $1.35M.
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 2.1K | $25.45 | $54K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 4.4K | $0.00 | |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 3.8K | $25.45 | $96K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 7.8K | $0.00 | |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 1.8K | $25.45 | $46K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 3.7K | $0.00 | |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 2.9K | $25.45 | $75K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 6.1K | $0.00 | |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 1.1K | $25.45 | $28K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 2.3K | $0.00 | |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 562 | $25.45 | $14K |
| 2026-05-26 | TENB | Tenable Holdings, Inc. | M — Option exercise | 1.2K | $0.00 | |
| 2026-02-27 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 11.8K | $19.00 | $224K |
| 2026-02-27 | TENB | Tenable Holdings, Inc. | M — Option exercise | 24.4K | $0.00 | |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 1.3K | $17.55 | $23K |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | M — Option exercise | 4.4K | $0.00 | |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 15.6K | $17.55 | $274K |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | M — Option exercise | 46.6K | $0.00 | |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | F — Tax withholding / forfeiture | 1.1K | $17.55 | $19K |
| 2026-02-25 | TENB | Tenable Holdings, Inc. | M — Option exercise | 3.7K | $0.00 |
Thurmond Mark C. is a corporate insider — currently tracked as Co-Chief Executive Officer, Director of Tenable Holdings, Inc. (TENB). InsiderAlpha tracks every SEC Form 4 filing in real time.
1 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 0 open-market purchases () and 8 open-market sales ($1.35M) across all tracked filings.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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