STOLPER MARK
SEC insider (Form 3/4/5 filer). CIK 0001281961. Director at Oncology Institute, Inc. (TOI) and 1 other issuer. 7 reported Form 4/5 transactions since Sep 2024; latest on Jul 27, 2026. Located in CERRITOS, CA.
Companies STOLPER MARK has filed insider reports for
- Oncology Institute, Inc. (TOI): Director
- RadNet, Inc. (RDNT): Officer, EVP, Chief Financial Officer
STOLPER MARK
CIK: 0001281961
Transaction Breakdown
Open Market Buys (P)0 (0.0%)
High conviction signal
Open Market Sales (S)1 (14.3%)
Position reduction
Option Exercises (M)1 (14.3%)
Derivative conversions
Awards (A)4 (57.1%)
Compensation grants
Other (G, F, J, C, D, …)1 (14.3%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (7 total)
- Jul 27, 2026TOI
Oncology Institute, Inc.
AwardDirect31.1K shares- - Jul 7, 2026TOI
Oncology Institute, Inc.
AwardDirect25.8K shares- - Mar 3, 2026RDNT
RadNet, Inc.
AwardDirect18.2K shares- - Dec 10, 2025RDNT
RadNet, Inc.
ExerciseDirect35.7K shares at avg. $6.07$217K - Sep 16, 2025RDNT
RadNet, Inc.
SaleDirect35K shares at avg. $73.89$2.6M - Jan 8, 2025RDNT
RadNet, Inc.
AwardDirect22.9K shares- - Dec 16, 2024RDNT
RadNet, Inc.
GiftDirect275 shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jul 27, 2026 |  TOI Oncology Institute, Inc. | Award | 31,124 | - | $0 | Direct |
| Jul 7, 2026 | TOI Oncology Institute, Inc. | Award | 25,833 | - | $0 | Direct |
| Mar 3, 2026 |  RDNT RadNet, Inc. | Award | 18,228 | - | $0 | Direct |
| Dec 10, 2025 | RDNT RadNet, Inc. | Exercise | 35,703 | $6.07 | $216,717 | Direct |
| Sep 16, 2025 | RDNT RadNet, Inc. | Sale | 35,000 | $73.89 | $2,586,150 | Direct |
| Jan 8, 2025 | RDNT RadNet, Inc. | Award | 22,889 | - | $0 | Direct |
| Dec 16, 2024 | RDNT RadNet, Inc. | Gift | 275 | - | $0 | Direct |
1-7 of 7 transactions