Thomas St Dennis
CIK 1339595 · EXECUTIVE CHAIRMAN · last filed 2026-05-26
Thomas St Dennis is an EXECUTIVE CHAIRMAN who has filed 117 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing shows the insider sold $139.8K of ACLS on May 26, 2026. Across all open-market trades the lifetime net is −$21.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $175.0M across reported positions.
"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.
$175.01M
5
117
-$21.03M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ACLS | Director | 17,695 | $180.12 | $3.19M | -$2.80M | 22 | 2026-05-26 |
| FORM | Director | 77,873 | $139.21 | $10.84M | -$16.31M | 62 | 2026-05-21 |
| VECO | Director | 61,697 | $77.48 | $4.78M | -$383.4K | 15 | 2026-05-13 |
| MATTSON TECHNOLOGY INC (MTSN) Delisted | Director | 0 | — | — | $0 | 4 | 2016-05-11 |
| AMAT | Senior Vice President | 275,373 | $567.25 | $156.21M | -$1.53M | 14 | 2009-09-02 |
Recent Filings
117 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-26 | ACLS | Sell (S) | −900 | -$139.8K | EDGAR |
| 2026-05-21 | FORM | Sell (S) | −1,000 | -$115.8K | EDGAR |
| 2026-05-19 | FORM | Grant (A) | +1,347 | $0 | EDGAR |
| 2026-05-18 | ACLS | Grant (A) | +1,440 | $0 | EDGAR |
| 2026-05-13 | VECO | Sell (S) | −1,400 | -$86.7K | EDGAR |
| 2026-05-11 | VECO | Grant (A) | +2,945 | $0 | EDGAR |
| 2026-02-11 | FORM | Sell (S) | −7,431 | -$697.4K | EDGAR |
| 2025-11-17 | FORM | Sell (S) | −2,000 | -$99.7K | EDGAR |
| 2025-05-30 | FORM | Sell (S) | −3,000 | -$93.7K | EDGAR |
| 2025-05-16 | FORM | Grant (A) | +6,528 | $0 | EDGAR |