MARK STOLPER
CIK 1281961 · EVP, Chief Financial Officer · last filed 2026-03-05
MARK STOLPER is an EVP, Chief Financial Officer who has filed 76 SEC Form 4 insider transactions across 7 companies since 2008. The most recent filing, for RDNT, was dated Mar 5, 2026. Across all open-market trades the lifetime net is −$6.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $6.9M across reported positions.
"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.
$6.92M
7
76
-$6.35M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| RDNT | EVP, Chief Financial Officer | 121,943 | $56.71 | $6.92M | -$5.07M | 26 | 2026-03-05 |
| CHRS | Director | — | $1.40 | — | $0 | 6 | 2024-06-05 |
| SURGALIGN HOLDINGS, INC. (SRGA) Delisted | Director | 28,867 | $0.18 | $5.3K | $25.0K | 4 | 2022-08-17 |
| RTI SURGICAL, INC. (RTIX) Delisted | Director | 0 | — | — | $22.9K | 6 | 2019-03-11 |
| RadNet, Inc. (ROIAK) Delisted | Executive VP and CFO | 170,319 | — | — | -$1.34M | 25 | 2017-01-09 |
| Star Equity Holdings, Inc. (HSON) Delisted | 500 | $9.88 | $4.9K | $1.3K | 1 | 2014-10-21 | |
| METROPOLITAN HEALTH NETWORKS INC (MDF) Delisted | Director | 37,232 | — | — | $0 | 5 | 2012-06-13 |
Recent Filings
76 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-05 | RDNT | Grant (A) | +18,228 | $0 | EDGAR |
| 2025-12-12 | RDNT | Exer (M) | +35,703 | $216.7K | EDGAR |
| 2025-09-18 | RDNT | Sell (S) | −35,000 | -$2.59M | EDGAR |
| 2025-01-10 | RDNT | Grant (A) | +22,889 | $0 | EDGAR |
| 2024-12-18 | RDNT | Gift (G) | −275 | $0 | EDGAR |
| 2024-06-12 | RDNT | Sell (S) | −25,000 | -$1.53M | EDGAR |
| 2024-06-05 | CHRS | Grant (A) | — | $0 | EDGAR |
| 2024-03-04 | RDNT | Grant (A) | +14,072 | $0 | EDGAR |
| 2024-01-10 | RDNT | Grant (A) | — | $0 | EDGAR |
| 2023-06-09 | CHRS | Grant (A) | — | $0 | EDGAR |