Mark C. Thurmond
CIK 1651579 · Co-Chief Executive Officer · last filed 2026-05-26
Mark C. Thurmond is a Co-Chief Executive Officer who has filed 54 SEC Form 4 insider transactions across 2 companies since 2015. The most recent filing, for TENB, was dated May 26, 2026. Across all open-market trades the lifetime net is −$9.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $4.6M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$4.58M
2
54
-$9.12M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| TENB | Co-Chief Executive Officer | 170,857 | $26.80 | $4.58M | -$9.12M | 49 | 2026-05-26 |
| QLIK TECHNOLOGIES INC (QLIK) Delisted | EVP, Worldwide Sales and Serv. | 0 | — | — | $0 | 5 | 2016-08-22 |
Recent Filings
54 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-26 | TENB | Mixed | +13,101 | -$312.2K | EDGAR |
| 2026-02-27 | TENB | Mixed | +12,592 | -$224.0K | EDGAR |
| 2026-02-25 | TENB | Mixed | +42,036 | -$373.5K | EDGAR |
| 2025-11-25 | TENB | Mixed | +8,638 | -$207.8K | EDGAR |
| 2025-08-27 | TENB | Sell (S) | −2,541 | -$75.8K | EDGAR |
| 2025-08-26 | TENB | Mixed | +34,815 | -$862.1K | EDGAR |
| 2025-05-29 | TENB | Sell (S) | −2,483 | -$80.6K | EDGAR |
| 2025-05-27 | TENB | Mixed | +11,153 | -$178.4K | EDGAR |
| 2025-02-28 | TENB | Sell (S) | −10,862 | -$414.6K | EDGAR |
| 2025-02-26 | TENB | Mixed | +33,029 | -$138.8K | EDGAR |