Thurmond Mark C.
SEC CIK 1651579 · EDGAR
BoughtSold
Companies
| Ticker | Company | Title | Holding | Bought | Sold | Trades | First | Last |
|---|---|---|---|---|---|---|---|---|
| TENB | Tenable Holdings, Inc. | Co-CEO, Dir | 197.4K | — | $9.12M | 79 | 2022-11-17 | 2026-08-24 |
Most active insiders at TENB, 12 months
| # | Insider | Title | Bought | Sold |
|---|---|---|---|---|
| 1 | SEAWELL A BROOKE | Dir | — | $2.85M |
| 2 | Brown Matthew Charles | CFO | $258.5K | — |
| 3 | COVIELLO ARTHUR W JR | Dir | $258.0K | — |
| 4 | Vicks Raymond Jr. | Dir | $99.8K | $65.4K |
| 5 | Zecher Linda Kay | Dir | — | $141.2K |
| 6 | Anschutz Barron | Principal Accounting Off | — | $28.4K |
| 7 | Howe Niloofar Razi | Dir | — | — |
| 8 | Huffard John C Jr | Dir | — | — |
| 9 | Thurmond Mark C. | Co-CEO, Dir | — | — |
| 10 | KEANE MARGARET M | Dir | — | — |
Transactions 79
| X | Filed | Traded | Ticker | Company | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-08-25 16:03 | 2026-08-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +25.4K | 197.4K | +15% | $0 |
| DM | 2026-08-25 16:03 | 2026-08-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | F - Tax | $33.94 | -12.3K | 195.3K | -6% | -$416.4K |
| DM | 2026-05-26 19:00 | 2026-05-22 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +25.4K | 184.3K | +16% | $0 |
| DM | 2026-05-26 19:00 | 2026-05-22 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | F - Tax | $25.45 | -12.3K | 182.2K | -6% | -$312.2K |
| D | 2026-02-27 | 2026-02-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +24.4K | 180.1K | +16% | $0 |
| D | 2026-02-27 | 2026-02-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | F - Tax | $19.00 | -11.8K | 168.3K | -7% | -$224.0K |
| DM | 2026-02-25 | 2026-02-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +63.3K | 117.7K | +116% | $0 |
| DM | 2026-02-25 | 2026-02-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | F - Tax | $17.55 | -21.3K | 117.0K | -15% | -$373.5K |
| DM | 2025-11-25 | 2025-11-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +16.7K | 115.8K | +17% | $0 |
| DM | 2025-11-25 | 2025-11-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | F - Tax | $25.68 | -8,092 | 111.4K | -7% | -$207.8K |
| 2025-08-27 | 2025-08-26 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | S - Sale | $29.84 | -2,541 | 105.0K | -2% | -$75.8K | |
| DM | 2025-08-26 | 2025-08-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +63.3K | 73.9K | +599% | $0 |
| D | 2025-08-26 | 2025-08-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | S - Sale+OE | $30.25 | -28.5K | 102.3K | -22% | -$862.1K |
| 2025-05-29 | 2025-05-27 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | S - Sale | $32.45 | -2,483 | 72.7K | -3% | -$80.6K | |
| DM | 2025-05-27 | 2025-05-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | M - OptEx | $0.00 | +16.7K | 64.6K | +35% | $0 |
| D | 2025-05-27 | 2025-05-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | Co-CEO, Dir | S - Sale+OE | $31.98 | -5,577 | 75.2K | -7% | -$178.4K |
| M | 2025-02-28 | 2025-02-26+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO, Co-CEO | S - Sale | $38.17 | -10.9K | 69.4K | -14% | -$414.6K |
| D | 2025-02-26 | 2025-02-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO, Co-CEO | S - Sale+OE | $38.48 | -3,606 | 74.3K | -5% | -$138.8K |
| DM | 2025-02-26 | 2025-02-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO, Co-CEO | M - OptEx | $0.00 | +36.6K | 42.6K | +611% | $0 |
| D | 2025-02-20 | 2025-02-19 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO, Co-CEO | S - Sale+OE | $39.56 | -1,341 | 41.3K | -3% | -$53.0K |
| D | 2025-02-20 | 2025-02-18 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO, Co-CEO | M - OptEx | $0.00 | +4,561 | 42.6K | +12% | $0 |
| 2024-12-02 | 2024-11-27 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $42.95 | -939 | 38.0K | -2% | -$40.3K | |
| M | 2024-11-27 | 2024-11-26 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $42.57 | -3,423 | 41.5K | -8% | -$145.7K |
| DM | 2024-11-26 | 2024-11-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +10.1K | 42.4K | +31% | $0 |
| D | 2024-11-26 | 2024-11-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $42.74 | -2,343 | 37.2K | -6% | -$100.1K |
| 2024-11-22 | 2024-11-20 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $40.71 | -823 | 34.7K | -2% | -$33.5K | |
| D | 2024-11-20 | 2024-11-18 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 37.7K | +14% | $0 |
| D | 2024-11-20 | 2024-11-19 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $40.72 | -2,209 | 35.5K | -6% | -$90.0K |
| M | 2024-08-28 | 2024-08-26+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $41.52 | -4,334 | 36.6K | -11% | -$179.9K |
| DM | 2024-08-26 | 2024-08-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +10.1K | 34.6K | +41% | $0 |
| D | 2024-08-26 | 2024-08-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $41.54 | -2,357 | 32.2K | -7% | -$97.9K |
| 2024-08-22 | 2024-08-21 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $42.17 | -818 | 29.7K | -3% | -$34.5K | |
| D | 2024-08-21 | 2024-08-20 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $42.36 | -2,224 | 30.5K | -7% | -$94.2K |
| D | 2024-08-21 | 2024-08-19 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 32.8K | +16% | $0 |
| 2024-08-01 | 2024-07-30 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $49.01 | -4,700 | 28.2K | -14% | -$230.3K | |
| 2024-05-29 | 2024-05-28 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $43.97 | -949 | 32.9K | -3% | -$41.7K | |
| DM | 2024-05-28 | 2024-05-23+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $43.27 | -5,752 | 32.0K | -15% | -$248.9K |
| DM | 2024-05-28 | 2024-05-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +5,219 | 37.2K | +16% | $0 |
| DM | 2024-05-23 | 2024-05-22 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,873 | 30.7K | +19% | $0 |
| D | 2024-05-23 | 2024-05-21 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $43.55 | -820 | 29.5K | -3% | -$35.7K |
| D | 2024-05-21 | 2024-05-20 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $43.76 | -2,219 | 30.3K | -7% | -$97.1K |
| D | 2024-05-21 | 2024-05-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 32.6K | +16% | $0 |
| 2024-03-22 | 2024-03-20 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $49.00 | -10.8K | 28.0K | -28% | -$530.4K | |
| M | 2024-02-29 | 2024-02-27+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $47.13 | -7,122 | 38.1K | -16% | -$335.6K |
| DM | 2024-02-27 | 2024-02-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +5,219 | 48.5K | +12% | $0 |
| DM | 2024-02-27 | 2024-02-23+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $47.71 | -8,794 | 47.2K | -16% | -$419.6K |
| DM | 2024-02-22 | 2024-02-20+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +24.1K | 35.1K | +218% | $0 |
| DM | 2024-02-22 | 2024-02-21+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $46.87 | -2,539 | 48.8K | -5% | -$119.0K |
| 2024-02-09 | 2024-02-07 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $51.45 | -26.2K | 27.3K | -49% | -$1.35M | |
| D | 2024-02-07 | 2024-02-05 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +13.1K | 57.5K | +30% | $0 |
| D | 2024-02-07 | 2024-02-06 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $47.34 | -3,976 | 53.5K | -7% | -$188.2K |
| 2023-11-30 | 2023-11-28 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $42.06 | -951 | 44.4K | -2% | -$40.0K | |
| DM | 2023-11-27 | 2023-11-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $40.02 | -3,328 | 42.6K | -7% | -$133.2K |
| DM | 2023-11-27 | 2023-11-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +5,218 | 44.0K | +13% | $0 |
| DM | 2023-11-21 | 2023-11-17+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $39.83 | -4,554 | 43.4K | -9% | -$181.4K |
| D | 2023-11-21 | 2023-11-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 45.6K | +11% | $0 |
| D | 2023-11-07 | 2023-11-06 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $36.93 | -6,368 | 43.4K | -13% | -$235.2K |
| D | 2023-11-07 | 2023-11-03 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +13.1K | 49.8K | +36% | $0 |
| 2023-08-29 | 2023-08-25 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $42.73 | -921 | 36.7K | -2% | -$39.4K | |
| DM | 2023-08-24 | 2023-08-22+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $44.88 | -15.1K | 35.0K | -30% | -$678.3K |
| DM | 2023-08-24 | 2023-08-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +5,218 | 40.2K | +15% | $0 |
| D | 2023-08-21 | 2023-08-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 49.7K | +10% | $0 |
| D | 2023-08-21 | 2023-08-18 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $44.44 | -2,195 | 47.5K | -4% | -$97.5K |
| D | 2023-08-07 | 2023-08-03 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +13.1K | 51.5K | +34% | $0 |
| D | 2023-08-07 | 2023-08-04 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $47.09 | -6,396 | 45.1K | -12% | -$301.2K |
| D | 2023-05-25 | 2023-05-24 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $37.54 | -2,516 | 37.8K | -6% | -$94.5K |
| D | 2023-05-25 | 2023-05-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +5,218 | 41.0K | +15% | $0 |
| D | 2023-05-19 | 2023-05-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 37.3K | +14% | $0 |
| D | 2023-05-19 | 2023-05-18 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $38.28 | -2,203 | 35.1K | -6% | -$84.3K |
| D | 2023-05-05 | 2023-05-03 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +13.1K | 39.0K | +51% | $0 |
| D | 2023-05-05 | 2023-05-04 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $35.18 | -6,245 | 32.7K | -16% | -$219.7K |
| M | 2023-02-28 | 2023-02-24+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale | $43.58 | -9,140 | 30.8K | -23% | -$398.3K |
| DM | 2023-02-24 | 2023-02-23 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +20.9K | 19.6K | New | $0 |
| D | 2023-02-22 | 2023-02-21 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $42.88 | -1,370 | 14.1K | -9% | -$58.7K |
| D | 2023-02-22 | 2023-02-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 15.5K | +42% | $0 |
| D | 2023-02-07 | 2023-02-03 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +13.1K | 14.9K | +718% | $0 |
| D | 2023-02-07 | 2023-02-06 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $43.25 | -4,002 | 10.9K | -27% | -$173.1K |
| D | 2022-11-21 | 2022-11-17 | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | M - OptEx | $0.00 | +4,561 | 6,385 | +250% | $0 |
| DM | 2022-11-21 | 2022-11-18+ | TENB | Tenable Holdings, Inc. | Thurmond Mark C. | COO | S - Sale+OE | $38.54 | -4,561 | 1,824 | -71% | -$175.8K |
Purchase Sale Sale after option exercise All abbreviations