Mark Stolper

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

Companies & Roles (2)

TOI

Oncology Institute, Inc.

Director

RDNT

RadNet, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (7 total)

TOI
Oncology Institute, Inc.
Jul 27, 2026
Award(A)
Direct
31.1K shares-
TOI
Oncology Institute, Inc.
Jul 7, 2026
Award(A)
Direct
25.8K shares-
RDNT
RadNet, Inc.
Mar 3, 2026
Award(A)
Direct
18.2K shares-
RDNT
RadNet, Inc.
Dec 10, 2025
Exercise(M)
Direct
35.7K shares at avg. $6.07$217K
RDNT
RadNet, Inc.
Sep 16, 2025
Sale(S)
Direct
35K shares at avg. $73.89$2.6M
RDNT
RadNet, Inc.
Jan 8, 2025
Award(A)
Direct
22.9K shares-
RDNT
RadNet, Inc.
Dec 16, 2024
Gift(G)
Direct
275 shares-

		Type	Shares	Price		Ownership
Jul 27, 2026	TOI Oncology Institute, Inc.	Award(A)	31,124	-	$0	Direct
Jul 7, 2026	TOI Oncology Institute, Inc.	Award(A)	25,833	-	$0	Direct
Mar 3, 2026	RDNT RadNet, Inc.	Award(A)	18,228	-	$0	Direct
Dec 10, 2025	RDNT RadNet, Inc.	Exercise(M)	35,703	$6.07	$216,717	Direct
Sep 16, 2025	RDNT RadNet, Inc.	Sale(S)	35,000	$73.89	$2,586,150	Direct
Jan 8, 2025	RDNT RadNet, Inc.	Award(A)	22,889	-	$0	Direct
Dec 16, 2024	RDNT RadNet, Inc.	Gift(G)	275	-	$0	Direct

1-7 of 7 transactions

About STOLPER MARK

STOLPER MARK (SEC CIK 0001281961) files insider reports with the SEC as Director of Oncology Institute, Inc. (TOI) and EVP, Chief Financial Officer of RadNet, Inc. (RDNT).

Signal8 holds 8 ownership filings by STOLPER MARK (1 Form 3, 7 Form 4), filed between Dec 18, 2024 and Jul 29, 2026. Those filings report 7 transactions, from Dec 16, 2024 to Jul 27, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on STOLPER MARK's filings is in CERRITOS, CA.

Recent filings by STOLPER MARK

Jul 27, 2026: Grant or award of TOI shares (Form 4, code A).
Jul 7, 2026: Grant or award of TOI shares (Form 4, code A).
Mar 3, 2026: Grant or award of RDNT shares (Form 4, code A).
Dec 10, 2025: Option exercise of RDNT shares (Form 4, code M).
Sep 16, 2025: Open-market sale of RDNT shares (Form 4, code S).

Other insiders filing for Oncology Institute, Inc. (TOI)

Kaushal Mohit, Director
McGeorge Anne, Director
Pacala Mark L, Director
TZOUMAKAS KIMBERLY JO, Director
Johnson Karen Marie, Director
Podnos Yale, Chief Medical Officer

How to read Form 4 transaction codes