SEC CIK 1651579
Thurmond Mark C.
Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.
Current Positions
| Company | Shares Owned | As Of |
|---|---|---|
| TENBview stock → | 195,289 | 2026-08-24 |
Position History — TENB
Reported shares owned immediately after each Form 4 transaction, over time.
Recent Filings — TENB
| Date | Activity | Shares | Price | Owned After |
|---|---|---|---|---|
| 2026-08-24 | Option exercise (derivative) | 4,368 | $0.00 | 26,208 |
| 2026-08-24 | Option exercise (derivative) | 7,764 | $0.00 | 77,644 |
| 2026-08-24 | Option exercise (derivative) | 3,713 | $0.00 | 7,426 |
| 2026-08-24 | Option exercise (derivative) | 6,095 | $0.00 | 60,957 |
| 2026-08-24 | Option exercise (derivative) | 2,267 | $0.00 | 13,606 |
| 2026-08-24 | Option exercise (derivative) | 1,162 | $0.00 | 2,330 |
| 2026-08-24 | Tax withholding | 2,112 | $33.94 | 195,289 |
| 2026-08-24 | Option exercise | 4,368 | $0.00 | 197,401 |
| 2026-08-24 | Tax withholding | 3,754 | $33.94 | 193,033 |
| 2026-08-24 | Option exercise | 7,764 | $0.00 | 196,787 |
| 2026-08-24 | Tax withholding | 1,796 | $33.94 | 189,023 |
| 2026-08-24 | Option exercise | 3,713 | $0.00 | 190,819 |
| 2026-08-24 | Tax withholding | 2,947 | $33.94 | 187,106 |
| 2026-08-24 | Option exercise | 6,095 | $0.00 | 190,053 |
| 2026-08-24 | Tax withholding | 1,097 | $33.94 | 183,958 |
| 2026-08-24 | Option exercise | 2,267 | $0.00 | 185,055 |
| 2026-08-24 | Tax withholding | 562 | $33.94 | 182,788 |
| 2026-08-24 | Option exercise | 1,162 | $0.00 | 183,350 |
| 2026-05-22 | Option exercise (derivative) | 4,368 | $0.00 | 30,576 |
| 2026-05-22 | Option exercise (derivative) | 7,764 | $0.00 | 85,408 |
| 2026-05-22 | Option exercise (derivative) | 3,713 | $0.00 | 11,139 |
| 2026-05-22 | Option exercise (derivative) | 6,095 | $0.00 | 67,052 |
| 2026-05-22 | Option exercise (derivative) | 2,267 | $0.00 | 15,873 |
| 2026-05-22 | Option exercise (derivative) | 1,162 | $0.00 | 3,492 |
| 2026-05-22 | Tax withholding | 2,112 | $25.45 | 182,188 |
| 2026-05-22 | Option exercise | 4,368 | $0.00 | 184,300 |
| 2026-05-22 | Tax withholding | 3,754 | $25.45 | 179,932 |
| 2026-05-22 | Option exercise | 7,764 | $0.00 | 183,686 |
| 2026-05-22 | Tax withholding | 1,796 | $25.45 | 175,922 |
| 2026-05-22 | Option exercise | 3,713 | $0.00 | 177,718 |
| 2026-05-22 | Tax withholding | 2,947 | $25.45 | 174,005 |
| 2026-05-22 | Option exercise | 6,095 | $0.00 | 176,952 |
| 2026-05-22 | Tax withholding | 1,097 | $25.45 | 170,857 |
| 2026-05-22 | Option exercise | 2,267 | $0.00 | 171,954 |
| 2026-05-22 | Tax withholding | 562 | $25.45 | 169,687 |
| 2026-05-22 | Option exercise | 1,162 | $0.00 | 170,249 |
| 2026-02-26 | Grant / award (derivative) | 341,847 | $0.00 | 341,847 |
| 2026-02-25 | Option exercise (derivative) | 24,381 | $0.00 | 73,147 |
| 2026-02-25 | Tax withholding | 11,789 | $19.00 | 168,267 |
| 2026-02-25 | Option exercise | 24,381 | $0.00 | 180,056 |
| 2026-02-23 | Option exercise (derivative) | 4,368 | $0.00 | 34,944 |
| 2026-02-23 | Option exercise (derivative) | 46,586 | $0.00 | 93,172 |
| 2026-02-23 | Option exercise (derivative) | 3,713 | $0.00 | 14,852 |
| 2026-02-23 | Option exercise (derivative) | 3,857 | $0.00 | 0 |
| 2026-02-23 | Option exercise (derivative) | 2,267 | $0.00 | 18,140 |
| 2026-02-23 | Option exercise (derivative) | 1,162 | $0.00 | 4,654 |
| 2026-02-23 | Option exercise (derivative) | 1,365 | $0.00 | 0 |
| 2026-02-23 | Tax withholding | 1,283 | $17.55 | 155,675 |
| 2026-02-23 | Option exercise | 4,368 | $0.00 | 156,958 |
| 2026-02-23 | Tax withholding | 15,635 | $17.55 | 152,590 |
| 2026-02-23 | Option exercise | 46,586 | $0.00 | 168,225 |
| 2026-02-23 | Tax withholding | 1,090 | $17.55 | 121,639 |
| 2026-02-23 | Option exercise | 3,713 | $0.00 | 122,729 |
| 2026-02-23 | Tax withholding | 1,865 | $17.55 | 119,016 |
| 2026-02-23 | Option exercise | 3,857 | $0.00 | 120,881 |
| 2026-02-23 | Tax withholding | 666 | $17.55 | 117,024 |
| 2026-02-23 | Option exercise | 2,267 | $0.00 | 117,690 |
| 2026-02-23 | Tax withholding | 342 | $17.55 | 115,423 |
| 2026-02-23 | Option exercise | 1,162 | $0.00 | 115,765 |
| 2026-02-23 | Tax withholding | 401 | $17.55 | 114,603 |
| 2026-02-23 | Option exercise | 1,365 | $0.00 | 115,004 |
| 2025-11-24 | Option exercise (derivative) | 4,368 | $0.00 | 39,312 |
| 2025-11-24 | Option exercise (derivative) | 3,713 | $0.00 | 18,565 |
| 2025-11-24 | Option exercise (derivative) | 3,857 | $0.00 | 3,857 |
| 2025-11-24 | Option exercise (derivative) | 2,267 | $0.00 | 20,407 |
| 2025-11-24 | Option exercise (derivative) | 1,162 | $0.00 | 5,816 |
| 2025-11-24 | Option exercise (derivative) | 1,363 | $0.00 | 1,365 |
| 2025-11-24 | Tax withholding | 2,112 | $25.68 | 113,639 |
| 2025-11-24 | Option exercise | 4,368 | $0.00 | 115,751 |
| 2025-11-24 | Tax withholding | 1,796 | $25.68 | 111,383 |
| 2025-11-24 | Option exercise | 3,713 | $0.00 | 113,179 |
| 2025-11-24 | Tax withholding | 1,865 | $25.68 | 109,466 |
| 2025-11-24 | Option exercise | 3,857 | $0.00 | 111,331 |
| 2025-11-24 | Tax withholding | 1,097 | $25.68 | 107,474 |
| 2025-11-24 | Option exercise | 2,267 | $0.00 | 108,571 |
| 2025-11-24 | Tax withholding | 562 | $25.68 | 106,304 |
| 2025-11-24 | Option exercise | 1,162 | $0.00 | 106,866 |
| 2025-11-24 | Tax withholding | 660 | $25.68 | 105,704 |
| 2025-11-24 | Option exercise | 1,363 | $0.00 | 106,364 |
| 2025-08-26 | Open-market sale | 2,541 | $29.84 | 105,001 |
| 2025-08-25 | Option exercise (derivative) | 1,363 | $0.00 | 2,728 |
| 2025-08-25 | Option exercise (derivative) | 3,857 | $0.00 | 7,714 |
| 2025-08-25 | Option exercise | 3,857 | $0.00 | 107,542 |
| 2025-08-25 | Option exercise | 1,363 | $0.00 | 103,685 |
| 2025-08-25 | Open-market sale | 28,500 | $30.25 | 102,322 |
| 2025-08-22 | Option exercise (derivative) | 2,267 | $0.00 | 22,674 |
| 2025-08-22 | Option exercise (derivative) | 3,713 | $0.00 | 22,278 |
| 2025-08-22 | Option exercise (derivative) | 46,585 | $0.00 | 139,758 |
| 2025-08-22 | Option exercise (derivative) | 4,368 | $0.00 | 43,680 |
| 2025-08-22 | Option exercise (derivative) | 1,162 | $0.00 | 6,978 |
| 2025-08-22 | Option exercise | 1,162 | $0.00 | 73,889 |
| 2025-08-22 | Option exercise | 4,368 | $0.00 | 130,822 |
| 2025-08-22 | Option exercise | 46,585 | $0.00 | 126,454 |
| 2025-08-22 | Option exercise | 3,713 | $0.00 | 79,869 |
| 2025-08-22 | Option exercise | 2,267 | $0.00 | 76,156 |
| 2025-05-27 | Open-market sale | 2,483 | $32.45 | 72,727 |
| 2025-05-23 | Option exercise (derivative) | 1,363 | $0.00 | 4,091 |
| 2025-05-23 | Option exercise (derivative) | 3,857 | $0.00 | 11,571 |
| 2025-05-23 | Open-market sale | 5,577 | $31.98 | 75,210 |
| 2025-05-23 | Option exercise | 1,363 | $0.00 | 76,306 |
| 2025-05-23 | Option exercise | 3,857 | $0.00 | 80,163 |
| 2025-05-22 | Option exercise (derivative) | 3,713 | $0.00 | 25,991 |
| 2025-05-22 | Option exercise (derivative) | 1,162 | $0.00 | 8,140 |
| 2025-05-22 | Option exercise (derivative) | 2,267 | $0.00 | 24,941 |
| 2025-05-22 | Option exercise (derivative) | 4,368 | $0.00 | 48,048 |
| 2025-05-22 | Option exercise | 1,162 | $0.00 | 64,595 |
| 2025-05-22 | Option exercise | 2,267 | $0.00 | 66,862 |
| 2025-05-22 | Option exercise | 3,713 | $0.00 | 70,575 |
| 2025-05-22 | Option exercise | 4,368 | $0.00 | 74,943 |
| 2025-02-27 | Open-market sale | 5,984 | $38.16 | 63,433 |
| 2025-02-26 | Open-market sale | 4,878 | $38.19 | 69,417 |
| 2025-02-25 | Open-market sale | 3,606 | $38.48 | 74,295 |
| 2025-02-24 | Option exercise (derivative) | 9,069 | $0.00 | 27,208 |
| 2025-02-24 | Option exercise (derivative) | 17,472 | $0.00 | 52,416 |
| 2025-02-24 | Option exercise (derivative) | 1,363 | $0.00 | 5,454 |
| 2025-02-24 | Option exercise (derivative) | 1,161 | $0.00 | 9,302 |
| 2025-02-24 | Option exercise (derivative) | 3,857 | $0.00 | 15,428 |
| 2025-02-24 | Option exercise (derivative) | 3,713 | $0.00 | 29,704 |
| 2025-02-24 | Option exercise | 1,363 | $0.00 | 42,629 |
| 2025-02-24 | Option exercise | 1,161 | $0.00 | 43,790 |
| 2025-02-24 | Option exercise | 9,069 | $0.00 | 52,859 |
| 2025-02-24 | Option exercise | 3,857 | $0.00 | 56,716 |
| 2025-02-24 | Option exercise | 3,713 | $0.00 | 60,429 |
| 2025-02-24 | Option exercise | 17,472 | $0.00 | 77,901 |
| 2025-02-21 | Grant / award (derivative) | 186,343 | $0.00 | 186,343 |
| 2025-02-19 | Open-market sale | 1,341 | $39.56 | 41,266 |
| 2025-02-18 | Option exercise (derivative) | 4,561 | $0.00 | 0 |
| 2025-02-18 | Option exercise | 4,561 | $0.00 | 42,607 |
| 2025-02-13 | Grant / award (derivative) | 36,277 | $0.00 | 36,277 |
| 2024-11-27 | Open-market sale | 939 | $42.95 | 38,046 |
| 2024-11-26 | Open-market sale | 886 | $42.61 | 41,522 |
| 2024-11-26 | Open-market sale | 2,537 | $42.56 | 38,985 |
| 2024-11-25 | Option exercise (derivative) | 1,363 | $0.00 | 6,817 |
| 2024-11-25 | Option exercise (derivative) | 3,857 | $0.00 | 19,285 |
| 2024-11-25 | Option exercise | 3,857 | $0.00 | 42,408 |
| 2024-11-25 | Option exercise | 1,363 | $0.00 | 38,551 |
| 2024-11-25 | Open-market sale | 2,343 | $42.74 | 37,188 |
| 2024-11-22 | Option exercise (derivative) | 3,713 | $0.00 | 33,417 |
| 2024-11-22 | Option exercise (derivative) | 1,161 | $0.00 | 10,463 |
| 2024-11-22 | Option exercise | 3,713 | $0.00 | 39,531 |
| 2024-11-22 | Option exercise | 1,161 | $0.00 | 35,818 |
| 2024-11-20 | Open-market sale | 823 | $40.71 | 34,657 |
| 2024-11-19 | Open-market sale | 2,209 | $40.72 | 35,480 |
| 2024-11-18 | Option exercise (derivative) | 4,561 | $0.00 | 4,561 |
| 2024-11-18 | Option exercise | 4,561 | $0.00 | 37,689 |
| 2024-08-27 | Open-market sale | 951 | $41.03 | 33,128 |
| 2024-08-26 | Open-market sale | 881 | $41.39 | 36,581 |
| 2024-08-26 | Open-market sale | 2,502 | $41.75 | 34,079 |
| 2024-08-23 | Option exercise (derivative) | 3,857 | $0.00 | 23,142 |
| 2024-08-23 | Option exercise (derivative) | 1,363 | $0.00 | 8,180 |
| 2024-08-23 | Open-market sale | 2,357 | $41.54 | 32,242 |
| 2024-08-23 | Option exercise | 1,363 | $0.00 | 33,605 |
| 2024-08-23 | Option exercise | 3,857 | $0.00 | 37,462 |
| 2024-08-22 | Option exercise (derivative) | 1,161 | $0.00 | 11,624 |
| 2024-08-22 | Option exercise (derivative) | 3,713 | $0.00 | 37,130 |
| 2024-08-22 | Option exercise | 3,713 | $0.00 | 34,599 |
| 2024-08-22 | Option exercise | 1,161 | $0.00 | 30,886 |
| 2024-08-21 | Open-market sale | 818 | $42.17 | 29,725 |
| 2024-08-20 | Open-market sale | 2,224 | $42.36 | 30,543 |
| 2024-08-19 | Option exercise (derivative) | 4,561 | $0.00 | 9,122 |
| 2024-08-19 | Option exercise | 4,561 | $0.00 | 32,767 |
| 2024-07-30 | Open-market sale | 4,700 | $49.01 | 28,206 |
| 2024-05-28 | Open-market sale | 949 | $43.97 | 32,906 |
| 2024-05-24 | Open-market sale | 2,506 | $43.48 | 33,855 |
| 2024-05-24 | Open-market sale | 875 | $42.94 | 36,361 |
| 2024-05-23 | Option exercise (derivative) | 1,362 | $0.00 | 9,543 |
| 2024-05-23 | Option exercise (derivative) | 3,857 | $0.00 | 26,999 |
| 2024-05-23 | Option exercise | 3,857 | $0.00 | 37,236 |
| 2024-05-23 | Option exercise | 1,362 | $0.00 | 33,379 |
| 2024-05-23 | Open-market sale | 2,371 | $43.18 | 32,017 |
| 2024-05-22 | Option exercise (derivative) | 1,161 | $0.00 | 12,785 |
| 2024-05-22 | Option exercise (derivative) | 3,712 | $0.00 | 40,843 |
| 2024-05-22 | Option exercise | 1,161 | $0.00 | 30,676 |
| 2024-05-22 | Option exercise | 3,712 | $0.00 | 34,388 |
| 2024-05-21 | Open-market sale | 820 | $43.55 | 29,515 |
| 2024-05-20 | Open-market sale | 2,219 | $43.76 | 30,335 |
| 2024-05-17 | Option exercise (derivative) | 4,561 | $0.00 | 13,683 |
| 2024-05-17 | Option exercise | 4,561 | $0.00 | 32,554 |
| 2024-03-20 | Open-market sale | 10,824 | $49.00 | 27,993 |
| 2024-02-28 | Open-market sale | 3,644 | $46.81 | 38,149 |
| 2024-02-27 | Open-market sale | 1,095 | $47.50 | 44,176 |
| 2024-02-27 | Open-market sale | 2,383 | $47.44 | 41,793 |
| 2024-02-26 | Open-market sale | 7,110 | $47.72 | 45,271 |
| 2024-02-23 | Option exercise (derivative) | 1,362 | $0.00 | 10,905 |
| 2024-02-23 | Option exercise (derivative) | 3,857 | $0.00 | 30,856 |
| 2024-02-23 | Option exercise | 1,362 | $0.00 | 48,524 |
| 2024-02-23 | Open-market sale | 1,684 | $47.67 | 47,162 |
| 2024-02-23 | Option exercise | 3,857 | $0.00 | 52,381 |
| 2024-02-22 | Grant / award (derivative) | 18,594 | $0.00 | 18,594 |
| 2024-02-22 | Option exercise (derivative) | 4,648 | $0.00 | 13,946 |
| 2024-02-22 | Option exercise (derivative) | 14,851 | $0.00 | 44,555 |
| 2024-02-22 | Grant / award (derivative) | 69,888 | $0.00 | 69,888 |
| 2024-02-22 | Option exercise | 4,648 | $0.00 | 35,084 |
| 2024-02-22 | Option exercise | 14,851 | $0.00 | 49,935 |
| 2024-02-22 | Open-market sale | 1,089 | $47.73 | 48,846 |
| 2024-02-21 | Open-market sale | 1,450 | $46.22 | 30,436 |
| 2024-02-20 | Option exercise (derivative) | 4,561 | $0.00 | 18,244 |
| 2024-02-20 | Option exercise | 4,561 | $0.00 | 31,886 |
| 2024-02-07 | Open-market sale | 26,175 | $51.45 | 27,325 |
| 2024-02-06 | Open-market sale | 3,976 | $47.34 | 53,500 |
| 2024-02-05 | Option exercise (derivative) | 13,103 | $0.00 | 0 |
| 2024-02-05 | Option exercise | 13,103 | $0.00 | 57,476 |
| 2023-11-28 | Open-market sale | 951 | $42.06 | 44,373 |
| 2023-11-27 | Open-market sale | 2,501 | $40.02 | 45,324 |
| 2023-11-24 | Option exercise (derivative) | 1,362 | $0.00 | 12,267 |
| 2023-11-24 | Option exercise (derivative) | 3,856 | $0.00 | 34,713 |
| 2023-11-24 | Option exercise | 1,362 | $0.00 | 43,969 |
| 2023-11-24 | Option exercise | 3,856 | $0.00 | 47,825 |
| 2023-11-22 | Open-market sale | 827 | $40.00 | 42,607 |
| 2023-11-20 | Open-market sale | 2,197 | $39.65 | 43,434 |
| 2023-11-17 | Option exercise (derivative) | 4,561 | $0.00 | 22,805 |
| 2023-11-17 | Option exercise | 4,561 | $0.00 | 45,631 |
| 2023-11-17 | Open-market sale | 2,357 | $40.00 | 41,070 |
| 2023-11-06 | Open-market sale | 6,368 | $36.93 | 43,427 |
| 2023-11-03 | Option exercise (derivative) | 13,103 | $0.00 | 13,103 |
| 2023-11-03 | Option exercise | 13,103 | $0.00 | 49,795 |
| 2023-08-25 | Open-market sale | 921 | $42.73 | 36,692 |
| 2023-08-24 | Open-market sale | 2,584 | $43.42 | 37,613 |
| 2023-08-23 | Option exercise (derivative) | 3,856 | $0.00 | 38,569 |
| 2023-08-23 | Option exercise (derivative) | 1,362 | $0.00 | 13,629 |
| 2023-08-23 | Option exercise | 3,856 | $0.00 | 40,197 |
| 2023-08-23 | Option exercise | 1,362 | $0.00 | 36,341 |
| 2023-08-22 | Open-market sale | 12,531 | $45.18 | 34,979 |
| 2023-08-18 | Open-market sale | 2,195 | $44.44 | 47,510 |
| 2023-08-17 | Option exercise (derivative) | 4,561 | $0.00 | 27,366 |
| 2023-08-17 | Option exercise | 4,561 | $0.00 | 49,705 |
| 2023-08-04 | Open-market sale | 6,396 | $47.09 | 45,144 |
| 2023-08-03 | Option exercise (derivative) | 13,103 | $0.00 | 26,206 |
| 2023-08-03 | Option exercise | 13,103 | $0.00 | 51,540 |
| 2023-05-24 | Open-market sale | 2,516 | $37.54 | 37,769 |
| 2023-05-23 | Option exercise (derivative) | 1,362 | $0.00 | 14,991 |
| 2023-05-23 | Option exercise (derivative) | 3,856 | $0.00 | 42,425 |
| 2023-05-23 | Option exercise | 5,218 | $0.00 | 40,953 |
| 2023-05-18 | Open-market sale | 2,203 | $38.28 | 35,067 |
| 2023-05-17 | Option exercise (derivative) | 4,561 | $0.00 | 31,927 |
| 2023-05-17 | Option exercise | 4,561 | $0.00 | 37,270 |
| 2023-05-04 | Open-market sale | 6,245 | $35.18 | 32,709 |
| 2023-05-03 | Option exercise (derivative) | 13,102 | $0.00 | 39,309 |
| 2023-05-03 | Option exercise | 13,102 | $0.00 | 38,954 |
| 2023-02-28 | Open-market sale | 2,464 | $44.15 | 25,852 |
| 2023-02-27 | Open-market sale | 2,472 | $44.02 | 28,316 |
| 2023-02-24 | Open-market sale | 4,204 | $42.98 | 30,788 |
| 2023-02-23 | Option exercise (derivative) | 15,427 | $0.00 | 46,281 |
| 2023-02-23 | Option exercise (derivative) | 5,450 | $0.00 | 16,353 |
| 2023-02-23 | Option exercise | 5,450 | $0.00 | 19,565 |
| 2023-02-23 | Option exercise | 15,427 | $0.00 | 34,992 |
| 2023-02-22 | Grant / award (derivative) | 59,406 | $0.00 | 59,406 |
| 2023-02-22 | Grant / award (derivative) | 21,803 | $0.00 | 21,803 |
| 2023-02-21 | Open-market sale | 1,370 | $42.88 | 14,115 |
| 2023-02-17 | Option exercise (derivative) | 4,561 | $0.00 | 36,488 |
| 2023-02-17 | Option exercise | 4,561 | $0.00 | 15,485 |
| 2023-02-06 | Open-market sale | 4,002 | $43.25 | 10,924 |
| 2023-02-03 | Option exercise (derivative) | 13,102 | $0.00 | 52,411 |
| 2023-02-03 | Option exercise | 13,102 | $0.00 | 14,926 |
| 2022-11-21 | Open-market sale | 2,565 | $38.49 | 1,824 |
| 2022-11-18 | Open-market sale | 1,996 | $38.61 | 4,389 |
| 2022-11-17 | Option exercise (derivative) | 4,561 | $0.00 | 41,049 |
| 2022-11-17 | Option exercise | 4,561 | $0.00 | 6,385 |
| 2022-11-09 | — | — | — | 1,824 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.