Thurmond Mark C.

Director · Officer · TENB

As of 2026-09-16, Thurmond Mark C. has 129 Form 4 transactions on record across 1 company — 79 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $953KIndirect: $0$953Kas of 2026-09-16
  • Direct $953K
  • Indirect $0
TENBdirect26,208 sh$953K

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

TENB · 129 trades
2026-08-24: Withheld for tax, 3,754 sh ($127K)2026-08-24: Withheld for tax, 2,947 sh ($100K)2026-08-24: Withheld for tax, 2,112 sh ($72K)2026-08-24: Withheld for tax, 1,796 sh ($61K)2026-08-24: Withheld for tax, 1,097 sh ($37K)2026-08-24: Withheld for tax, 562 sh ($19K)2026-08-24: Option exercise, 2,267 sh ($0)2026-08-24: Option exercise, 3,713 sh ($0)2026-08-24: Option exercise, 6,095 sh ($0)2026-08-24: Option exercise, 1,162 sh ($0)2026-08-24: Option exercise, 4,368 sh ($0)2026-08-24: Option exercise, 7,764 sh ($0)2026-08-24: Option exercise, 3,713 sh ($0)2026-08-24: Option exercise, 6,095 sh ($0)2026-08-24: Option exercise, 2,267 sh ($0)2026-08-24: Option exercise, 1,162 sh ($0)2026-08-24: Option exercise, 4,368 sh ($0)2026-08-24: Option exercise, 7,764 sh ($0)2026-05-22: Withheld for tax, 3,754 sh ($96K)2026-05-22: Withheld for tax, 2,947 sh ($75K)2026-05-22: Withheld for tax, 2,112 sh ($54K)2026-05-22: Withheld for tax, 1,796 sh ($46K)2026-05-22: Withheld for tax, 1,097 sh ($28K)2026-05-22: Withheld for tax, 562 sh ($14K)2026-05-22: Option exercise, 1,162 sh ($0)2026-05-22: Option exercise, 4,368 sh ($0)2026-05-22: Option exercise, 7,764 sh ($0)2026-05-22: Option exercise, 3,713 sh ($0)2026-05-22: Option exercise, 6,095 sh ($0)2026-05-22: Option exercise, 2,267 sh ($0)2026-05-22: Option exercise, 1,162 sh ($0)2026-05-22: Option exercise, 4,368 sh ($0)2026-05-22: Option exercise, 7,764 sh ($0)2026-05-22: Option exercise, 3,713 sh ($0)2026-05-22: Option exercise, 6,095 sh ($0)2026-05-22: Option exercise, 2,267 sh ($0)2026-02-26: Award / grant, 341,847 sh ($0)2026-02-25: Withheld for tax, 11,789 sh ($224K)2026-02-25: Option exercise, 24,381 sh ($0)2026-02-25: Option exercise, 24,381 sh ($0)2026-02-23: Withheld for tax, 15,635 sh ($274K)2026-02-23: Withheld for tax, 1,865 sh ($33K)2026-02-23: Withheld for tax, 1,283 sh ($23K)2026-02-23: Withheld for tax, 1,090 sh ($19K)2026-02-23: Withheld for tax, 666 sh ($12K)2026-02-23: Withheld for tax, 401 sh ($7K)2026-02-23: Withheld for tax, 342 sh ($6K)2026-02-23: Option exercise, 1,365 sh ($0)2026-02-23: Option exercise, 1,365 sh ($0)2026-02-23: Option exercise, 4,368 sh ($0)2026-02-23: Option exercise, 46,586 sh ($0)2026-02-23: Option exercise, 3,713 sh ($0)2026-02-23: Option exercise, 3,857 sh ($0)2026-02-23: Option exercise, 2,267 sh ($0)2026-02-23: Option exercise, 1,162 sh ($0)2026-02-23: Option exercise, 3,857 sh ($0)2026-02-23: Option exercise, 4,368 sh ($0)2026-02-23: Option exercise, 3,713 sh ($0)2026-02-23: Option exercise, 46,586 sh ($0)2026-02-23: Option exercise, 2,267 sh ($0)2026-02-23: Option exercise, 1,162 sh ($0)2025-11-24: Withheld for tax, 2,112 sh ($54K)2025-11-24: Withheld for tax, 1,865 sh ($48K)2025-11-24: Withheld for tax, 1,796 sh ($46K)2025-11-24: Withheld for tax, 1,097 sh ($28K)2025-11-24: Withheld for tax, 660 sh ($17K)2025-11-24: Withheld for tax, 562 sh ($14K)2025-11-24: Option exercise, 2,267 sh ($0)2025-11-24: Option exercise, 1,363 sh ($0)2025-11-24: Option exercise, 1,162 sh ($0)2025-11-24: Option exercise, 2,267 sh ($0)2025-11-24: Option exercise, 3,857 sh ($0)2025-11-24: Option exercise, 3,713 sh ($0)2025-11-24: Option exercise, 4,368 sh ($0)2025-11-24: Option exercise, 1,363 sh ($0)2025-11-24: Option exercise, 1,162 sh ($0)2025-11-24: Option exercise, 3,857 sh ($0)2025-11-24: Option exercise, 3,713 sh ($0)2025-11-24: Option exercise, 4,368 sh ($0)2025-08-26: Sale, 2,541 sh ($76K)2025-08-25: Sale, 28,500 sh ($862K)2025-08-25: Option exercise, 3,857 sh ($0)2025-08-25: Option exercise, 1,363 sh ($0)2025-08-25: Option exercise, 3,857 sh ($0)2025-08-25: Option exercise, 1,363 sh ($0)2025-08-22: Option exercise, 1,162 sh ($0)2025-08-22: Option exercise, 4,368 sh ($0)2025-08-22: Option exercise, 3,713 sh ($0)2025-08-22: Option exercise, 2,267 sh ($0)2025-08-22: Option exercise, 1,162 sh ($0)2025-08-22: Option exercise, 4,368 sh ($0)2025-08-22: Option exercise, 46,585 sh ($0)2025-08-22: Option exercise, 3,713 sh ($0)2025-08-22: Option exercise, 46,585 sh ($0)2025-08-22: Option exercise, 2,267 sh ($0)2025-05-27: Sale, 2,483 sh ($81K)2025-05-23: Sale, 5,577 sh ($178K)2025-05-23: Option exercise, 1,363 sh ($0)2025-05-23: Option exercise, 3,857 sh ($0)2025-05-23: Option exercise, 1,363 sh ($0)2025-05-23: Option exercise, 3,857 sh ($0)2025-05-22: Option exercise, 4,368 sh ($0)2025-05-22: Option exercise, 4,368 sh ($0)2025-05-22: Option exercise, 3,713 sh ($0)2025-05-22: Option exercise, 3,713 sh ($0)2025-05-22: Option exercise, 2,267 sh ($0)2025-05-22: Option exercise, 1,162 sh ($0)2025-05-22: Option exercise, 2,267 sh ($0)2025-05-22: Option exercise, 1,162 sh ($0)2025-02-27: Sale, 5,984 sh ($228K)2025-02-26: Sale, 4,878 sh ($186K)2025-02-25: Sale, 3,606 sh ($139K)2025-02-24: Option exercise, 9,069 sh ($0)2025-02-24: Option exercise, 1,161 sh ($0)2025-02-24: Option exercise, 1,363 sh ($0)2025-02-24: Option exercise, 9,069 sh ($0)2025-02-24: Option exercise, 1,161 sh ($0)2025-02-24: Option exercise, 17,472 sh ($0)2025-02-24: Option exercise, 17,472 sh ($0)2025-02-24: Option exercise, 3,713 sh ($0)2025-02-24: Option exercise, 3,857 sh ($0)2025-02-24: Option exercise, 1,363 sh ($0)2025-02-24: Option exercise, 3,713 sh ($0)2025-02-24: Option exercise, 3,857 sh ($0)2025-02-21: Award / grant, 186,343 sh ($0)2025-02-19: Sale, 1,341 sh ($53K)2025-02-18: Option exercise, 4,561 sh ($0)2025-02-18: Option exercise, 4,561 sh ($0)2025-02-13: Award / grant, 36,277 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2025-08-26TENBSale2,541 @ $29.84$76K−2.4% of holding105,001Form 4
2025-08-25TENBSale28,500 @ $30.25$862K−21.8% of holding102,322Form 4
2025-05-27TENBSale2,483 @ $32.45$81K−3.3% of holding72,727Form 4
2025-05-23TENBSale5,577 @ $31.98$178K−6.9% of holding75,210Form 4
2025-02-27TENBSale5,984 @ $38.16$228K−8.6% of holding63,433Form 4
2025-02-26TENBSale4,878 @ $38.19$186K−6.6% of holding69,417Form 4
2025-02-25TENBSale3,606 @ $38.48$139K−4.6% of holding74,295Form 4
2025-02-19TENBSale1,341 @ $39.56$53K−3.1% of holding41,266Form 4
121 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-08-24TENBWithheld for tax3,754193,033Form 4
2026-08-24TENBWithheld for tax2,947187,106Form 4
2026-08-24TENBWithheld for tax2,112195,289Form 4
2026-08-24TENBWithheld for tax1,796189,023Form 4
2026-08-24TENBWithheld for tax1,097183,958Form 4
2026-08-24TENBWithheld for tax562182,788Form 4
2026-08-24TENBOption exercise2,267185,055Form 4
2026-08-24TENBOption exercise3,713190,819Form 4
2026-08-24TENBOption exercise6,095190,053Form 4
2026-08-24TENBOption exercise1,162183,350Form 4
2026-08-24TENBOption exercise4,36826,208Form 4
2026-08-24TENBOption exercise7,76477,644Form 4
2026-08-24TENBOption exercise3,7137,426Form 4
2026-08-24TENBOption exercise6,09560,957Form 4
2026-08-24TENBOption exercise2,26713,606Form 4
2026-08-24TENBOption exercise1,1622,330Form 4
2026-08-24TENBOption exercise4,368197,401Form 4
2026-08-24TENBOption exercise7,764196,787Form 4
2026-05-22TENBWithheld for tax3,754179,932Form 4
2026-05-22TENBWithheld for tax2,947174,005Form 4
2026-05-22TENBWithheld for tax2,112182,188Form 4
2026-05-22TENBWithheld for tax1,796175,922Form 4
2026-05-22TENBWithheld for tax1,097170,857Form 4
2026-05-22TENBWithheld for tax562169,687Form 4
2026-05-22TENBOption exercise1,1623,492Form 4
2026-05-22TENBOption exercise4,368184,300Form 4
2026-05-22TENBOption exercise7,764183,686Form 4
2026-05-22TENBOption exercise3,713177,718Form 4
2026-05-22TENBOption exercise6,095176,952Form 4
2026-05-22TENBOption exercise2,267171,954Form 4
2026-05-22TENBOption exercise1,162170,249Form 4
2026-05-22TENBOption exercise4,36830,576Form 4
2026-05-22TENBOption exercise7,76485,408Form 4
2026-05-22TENBOption exercise3,71311,139Form 4
2026-05-22TENBOption exercise6,09567,052Form 4
2026-05-22TENBOption exercise2,26715,873Form 4
2026-02-26TENBAward / grant341,847341,847Form 4
2026-02-25TENBWithheld for tax11,789168,267Form 4
2026-02-25TENBOption exercise24,38173,147Form 4
2026-02-25TENBOption exercise24,381180,056Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.