Mason Heather L
Director · IMTX, ASRT
As of 2026-09-16, Mason Heather L has 12 Form 4 transactions on record across 2 companies — 10 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
- Direct $415K
- Indirect $0
| IMTX | direct | 48,000 sh | $415K |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|
12 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-06-16 | IMTX | Award / grant | 48,000 | 48,000 | Form 4 |
| 2026-06-16 | ASRT | Code U | 6,666 | 0 | Form 4 |
| 2026-06-16 | ASRT | Code U | 20,944 | 0 | Form 4 |
| 2026-06-16 | ASRT | Disposition | 5,415 | 0 | Form 4 |
| 2026-06-16 | ASRT | Disposition | 36,666 | 0 | Form 4 |
| 2026-06-16 | ASRT | Disposition | 5,415 | 0 | Form 4 |
| 2026-06-16 | ASRT | Disposition | 36,666 | 0 | Form 4 |
| 2026-05-13 | ASRT | Gift | 6,666 | 6,666 | Form 4 |
| 2026-05-13 | ASRT | Gift | 6,666 | 20,944 | Form 4 |
| 2026-05-05 | ASRT | Award / grant | 4,851 | 27,610 | Form 4 |
| 2025-05-07 | ASRT | Award / grant | 81,225 | 81,225 | Form 4 |
| 2025-05-07 | ASRT | Award / grant | 53,750 | 341,400 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.