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.
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Disclosed Exposure
$5.40M
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 | $31.63 | $5.40M | -$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 5 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 |
|---|---|---|---|---|---|
| 2024-08-20 | TENB | Notice (144) | −2,224 | -$94.2K | EDGAR |
| 2024-08-01 | TENB | Sell (S) | −4,700 | -$230.3K | EDGAR |
| 2024-07-30 | TENB | Notice (144) | −4,700 | -$230.3K | EDGAR |
| 2024-05-29 | TENB | Sell (S) | −949 | -$41.7K | EDGAR |
| 2024-05-28 | TENB | Notice (144) | −949 | -$41.7K | EDGAR |
| 2024-05-28 | TENB | Notice (144) | −949 | -$41.7K | EDGAR |
| 2024-05-28 | TENB | Mixed | −533 | -$248.9K | EDGAR |
| 2024-05-24 | TENB | Notice (144) | −2,506 | -$108.9K | EDGAR |
| 2024-05-24 | TENB | Notice (144) | −875 | -$37.6K | EDGAR |
| 2024-05-23 | TENB | Notice (144) | −2,371 | -$102.4K | 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.