MARK STOLPER
CIK 1281961 · EVP, Chief Financial Officer · last filed 2026-03-05
"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.
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Disclosed Exposure
$6.92M
Companies
7
Total Filings
76
Lifetime Open-Market Net
-$6.35M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| 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 · Page 6 of 8
76 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2015-04-30 | RadNet, Inc. (ROIAK) Delisted | Other (J) | −2,250 | $0 | EDGAR |
| 2015-04-17 | RadNet, Inc. (ROIAK) Delisted | Mixed | +60,414 | $0 | EDGAR |
| 2015-01-05 | RadNet, Inc. (ROIAK) Delisted | Grant (A) | +25,025 | $0 | EDGAR |
| 2014-10-21 | Star Equity Holdings, Inc. (HSON) Delisted | Buy (P) | +500 | $1.3K | EDGAR |
| 2014-01-03 | RadNet, Inc. (ROIAK) Delisted | Grant (A) | +77,160 | $0 | EDGAR |
| 2013-12-17 | RadNet, Inc. (ROIAK) Delisted | Other (J) | −18,669 | $0 | EDGAR |
| 2013-05-23 | RadNet, Inc. (ROIAK) Delisted | Sell (S) | −75,000 | -$182.5K | EDGAR |
| 2013-01-03 | RadNet, Inc. (ROIAK) Delisted | Grant (A) | +50,000 | $0 | EDGAR |
| 2012-12-26 | — | Disp (D) | −37,232 | -$418.9K | |
| 2012-06-13 | METROPOLITAN HEALTH NETWORKS INC (MDF) Delisted | Grant (A) | +9,069 | $0 | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.