Mark C. Thurmond
CIK 1651579 · Co-Chief Executive Officer · last filed 2026-05-26
"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.
Loading insider history…
Disclosed Exposure
$5.38M
Companies
2
Total Filings
106
Lifetime Open-Market Net
-$9.12M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| TENB | Co-Chief Executive Officer | 170,857 | $31.48 | $5.38M | -$9.12M | 49 | 2026-05-26 |
| QLIK TECHNOLOGIES INC (QLIK) Delisted | EVP, Worldwide Sales and Serv. | 0 | — | — | $0 | 5 | 2016-08-22 |
Recent Filings · Page 10 of 11
106 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2023-05-24 | TENB | Notice (144) | −2,516 | -$94.5K | EDGAR |
| 2023-05-19 | TENB | Mixed | +2,358 | -$84.3K | EDGAR |
| 2023-05-18 | TENB | Notice (144) | −2,203 | -$84.3K | EDGAR |
| 2023-05-05 | TENB | Mixed | +6,857 | -$219.7K | EDGAR |
| 2023-05-04 | TENB | Notice (144) | −6,245 | -$219.7K | EDGAR |
| 2023-02-28 | TENB | Sell (S) | −9,140 | -$398.3K | EDGAR |
| 2023-02-24 | TENB | Mixed | +20,877 | $0 | EDGAR |
| 2023-02-23 | TENB | Grant (A) | — | $0 | EDGAR |
| 2023-02-22 | TENB | Mixed | +3,191 | -$58.7K | EDGAR |
| 2023-02-07 | TENB | Mixed | +9,100 | -$173.1K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.