Thomas St Dennis
CIK 1339595 · EXECUTIVE CHAIRMAN · last filed 2026-06-16
Thomas St Dennis is an EXECUTIVE CHAIRMAN who has filed 130 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing, for FORM, was dated Jun 16, 2026. Across all open-market trades the lifetime net is −$21.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $125.1M across reported positions. 17 SEC filings were submitted jointly with APPLIED MATERIALS INC /DE.
"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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
FORM price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
7005 SOUTHFRONT ROAD
LIVERMORE, CA 94551
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| FORM | Director | 74,333 | $105.01 | $7.81M | -$16.74M | 63 | 2026-06-16 |
| ACLS | Director | 17,695 | $108.35 | $1.92M | -$2.80M | 22 | 2026-05-26 |
| VECO | Director | 61,697 | $42.75 | $2.64M | -$383.4K | 15 | 2026-05-13 |
| MATTSON TECHNOLOGY INC (MTSN) Delisted | Director | 0 | — | — | $0 | 4 | 2016-05-11 |
| AMAT | Senior Vice President | 275,373 | $409.29 | $112.71M | -$1.53M | 14 | 2009-09-02 |
Recent Filings
130 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-16 | FORM | Mixed | −3,540 | -$424.2K | EDGAR |
| 2026-06-15 | FORM | Notice (144) | −2,800 | -$424.2K | EDGAR |
| 2026-05-26 | ACLS | Sell (S) | −900 | -$139.8K | EDGAR |
| 2026-05-22 | ACLS | Notice (144) | −900 | -$139.8K | EDGAR |
| 2026-05-21 | FORM | Sell (S) | −1,000 | -$115.8K | EDGAR |
| 2026-05-19 | FORM | Notice (144) | −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 | Notice (144) | −1,400 | -$86.7K | EDGAR |
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.