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
$5.38M
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 7 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 |
|---|---|---|---|---|---|
| 2024-02-27 | TENB | Mixed | −3,575 | -$419.6K | EDGAR |
| 2024-02-26 | TENB | Notice (144) | −7,110 | -$339.3K | EDGAR |
| 2024-02-23 | TENB | Notice (144) | −1,684 | -$80.3K | EDGAR |
| 2024-02-22 | TENB | Notice (144) | −1,089 | -$52.0K | EDGAR |
| 2024-02-22 | TENB | Mixed | +21,521 | -$119.0K | EDGAR |
| 2024-02-21 | TENB | Notice (144) | −1,450 | -$67.0K | EDGAR |
| 2024-02-09 | TENB | Sell (S) | −26,175 | -$1.35M | EDGAR |
| 2024-02-07 | TENB | Notice (144) | −26,175 | -$1.35M | EDGAR |
| 2024-02-07 | TENB | Mixed | +9,127 | -$188.2K | EDGAR |
| 2024-02-06 | TENB | Notice (144) | −3,976 | -$188.2K | 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.