Mason Heather L
SEC insider (Form 3/4/5 filer). CIK 0001432601. Director at Immatics N.V. (IMTX) and 1 other issuer. 10 reported Form 4/5 transactions since Sep 2024; latest on Jun 16, 2026. Located in LAKE FOREST, IL.
Companies Mason Heather L has filed insider reports for
- Immatics N.V. (IMTX): Director
- Assertio Holdings, Inc. (ASRT): Director
Mason Heather L
CIK: 0001432601
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (10 total)
- Jun 16, 2026IMTX
Immatics N.V.
AwardDirectStock Option (Right to Buy)
48K shares- - Jun 16, 2026ASRT
Assertio Holdings, Inc.
Tender OfferIndirect6.7K shares- - Jun 16, 2026ASRT
Assertio Holdings, Inc.
Tender OfferDirect20.9K shares- - Jun 16, 2026ASRT
Assertio Holdings, Inc.
DispositionDirectStock Option (Right to Buy)
36.7K shares- - Jun 16, 2026ASRT
Assertio Holdings, Inc.
DispositionDirectStock Option (Right to Buy)
5.4K shares- - May 13, 2026ASRT
Assertio Holdings, Inc.
GiftDirect6.7K shares- - May 13, 2026ASRT
Assertio Holdings, Inc.
GiftIndirect6.7K shares- - May 5, 2026ASRT
Assertio Holdings, Inc.
AwardDirect4.9K shares- - May 7, 2025ASRT
Assertio Holdings, Inc.
AwardDirect53.8K shares- - Nov 18, 2024ASRT
Assertio Holdings, Inc.
PurchaseDirect75K shares at avg. $0.80$60K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jun 16, 2026 |  IMTX Immatics N.V. | Award Stock Option (Right to Buy) | 48,000 | - | - | Direct |
| Jun 16, 2026 |  ASRT Assertio Holdings, Inc. | Tender Offer | 6,666 | - | $0 | Indirect |
| Jun 16, 2026 | ASRT Assertio Holdings, Inc. | Tender Offer | 20,944 | - | $0 | Direct |
| Jun 16, 2026 | ASRT Assertio Holdings, Inc. | Disposition Stock Option (Right to Buy) | 36,666 | - | - | Direct |
| Jun 16, 2026 | ASRT Assertio Holdings, Inc. | Disposition Stock Option (Right to Buy) | 5,415 | - | - | Direct |
| May 13, 2026 | ASRT Assertio Holdings, Inc. | Gift | 6,666 | - | $0 | Direct |
| May 13, 2026 | ASRT Assertio Holdings, Inc. | Gift | 6,666 | - | $0 | Indirect |
| May 5, 2026 | ASRT Assertio Holdings, Inc. | Award | 4,851 | - | $0 | Direct |
| May 7, 2025 | ASRT Assertio Holdings, Inc. | Award | 53,750 | - | - | Direct |
| Nov 18, 2024 | ASRT Assertio Holdings, Inc. | Purchase | 75,000 | $0.80 | $60,000 | Direct |
1-10 of 10 transactions