Thomas St Dennis
CIK 1339595 · EXECUTIVE CHAIRMAN · last filed 2026-06-16
"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
$133.31M
Companies
5
Total Filings
130
Lifetime Open-Market Net
-$21.45M
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 |
|---|---|---|---|---|---|---|---|
| FORM | Director | 74,333 | $95.41 | $7.09M | -$16.74M | 63 | 2026-06-16 |
| ACLS | Director | 17,695 | $110.09 | $1.95M | -$2.80M | 22 | 2026-05-26 |
| VECO | Director | 61,697 | $42.05 | $2.59M | -$383.4K | 15 | 2026-05-13 |
| MATTSON TECHNOLOGY INC (MTSN) Delisted | Director | 0 | — | — | $0 | 4 | 2016-05-11 |
| AMAT | Senior Vice President | 275,373 | $441.85 | $121.67M | -$1.53M | 14 | 2009-09-02 |
Recent Filings · Page 10 of 13
130 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 |
|---|---|---|---|---|---|
| 2015-07-16 | ACLS | Grant (A) | +16,000 | $0 | EDGAR |
| 2015-06-01 | FORM | Grant (A) | — | $0 | EDGAR |
| 2015-05-29 | MATTSON TECHNOLOGY INC (MTSN) Delisted | Grant (A) | +12,500 | $0 | EDGAR |
| 2015-05-21 | FORM | Sell (S) | −130,000 | -$1.16M | EDGAR |
| 2015-05-18 | ACLS | Grant (A) | +45,000 | $0 | EDGAR |
| 2015-05-08 | FORM | Mixed | +9,394 | -$87.9K | EDGAR |
| 2015-05-07 | FORM | Mixed | +9,393 | -$87.5K | EDGAR |
| 2015-05-06 | FORM | Mixed | +87,218 | -$781.5K | EDGAR |
| 2015-03-20 | MATTSON TECHNOLOGY INC (MTSN) Delisted | Grant (A) | +12,500 | $0 | EDGAR |
| 2015-03-09 | FORM | Sell (S) | −90,000 | -$824.0K | 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.