Heather L Mason
CIK 1432601 · Interim Executive Officer · last filed 2026-06-18
Heather L Mason is an Interim Executive Officer who has filed 65 SEC Form 4 insider transactions across 3 companies since 2008. The most recent filing, for IMTX, was dated Jun 18, 2026. Across all open-market trades the lifetime net is −$19.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $13.5M across reported positions. 49 SEC filings were submitted jointly with Laboratories Abbott.
"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.
ABT 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
SUITE 300
LAKE FOREST, IL 60045
Holdings By Company
Recent Filings
65 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-18 | IMTX | Grant (A) | — | $0 | EDGAR |
| 2026-06-16 | Assertio Holdings, Inc. (ASRT) Delisted | Mixed | −27,610 | $0 | EDGAR |
| 2026-05-15 | Assertio Holdings, Inc. (ASRT) Delisted | Gift (G) | — | $0 | EDGAR |
| 2026-05-06 | Assertio Holdings, Inc. (ASRT) Delisted | Grant (A) | +4,851 | $0 | EDGAR |
| 2025-05-09 | Assertio Holdings, Inc. (ASRT) Delisted | Grant (A) | +53,750 | $0 | EDGAR |
| 2024-11-19 | Assertio Holdings, Inc. (ASRT) Delisted | Buy (P) | +75,000 | $60.0K | EDGAR |
| 2024-06-06 | Assertio Holdings, Inc. (ASRT) Delisted | Buy (P) | +25,000 | $24.2K | EDGAR |
| 2024-01-04 | Assertio Holdings, Inc. (ASRT) Delisted | Grant (A) | — | $0 | EDGAR |
| 2023-05-22 | Assertio Holdings, Inc. (ASRT) Delisted | Sell (S) | −89,286 | -$652.0K | EDGAR |
| 2023-05-19 | Assertio Holdings, Inc. (ASRT) Delisted | Notice (144) | −89,286 | -$651.8K | 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.