Mark Stolper is CFO & VP at RadNet, Inc. (RDNT). They have made 19 open-market trades across 4 companies since 2009, most recently 2026-07-27.
CIK 0001281961
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
3 open-market purchases totalling $49K since 2013, against 16 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| RDNT | SELL | 2025-09-16 | 2025-09-18 | $73.89 | $2.6M | -1.4% | +1.5% | -7.8% |
| RDNT | SELL | 2024-06-10 | 2024-06-12 | $61.27 | $1.5M | -5.9% | +0.2% | -1.6% |
| SRGA | BUY | 2021-02-01 | 2021-02-02 | $1.50 | $25K | +22.1% | -4.2% | -26.3% |
| RDNT | SELL | 2019-08-15 | 2019-08-16 | $15.15 | $627K | -7.8% | -0.5% | +3.9% |
| RDNT | SELL | 2019-03-18 | 2019-03-20 | $14.99 | $225K | -11.0% | -13.6% | -7.4% |
| RDNT | SELL | 2018-03-20 | 2018-03-20 | $13.19 | $198K | +1.1% | +4.9% | +6.0% |
| RDNT | SELL | 2017-08-30 | 2017-08-30 | $10.19 | $102K | +9.1% | +11.1% | -5.8% |
| RDNT | SELL | 2017-05-24 | 2017-05-24 | $7.33 | $110K | +0.7% | +4.1% | +33.4% |
| RTIX | BUY | 2017-05-05 | 2017-05-09 | $4.57 | $23K | +7.8% | +16.7% | +22.2% |
| RDNT | SELL | 2016-08-12 | 2016-08-12 | $6.25 | $443K | +4.0% | +11.5% | +6.6% |
| RDNT | SELL | 2015-12-03 | 2015-12-03 | $6.18 | $119K | -10.6% | +0.3% | -4.1% |
| RDNT | SELL | 2015-05-20 | 2015-05-22 | $6.86 | $343K | -10.6% | +0.3% | +0.3% |
| RDNT | SELL | 2014-05-13 | 2014-05-13 | $6.47 | $485K | -10.6% | +0.3% | +0.3% |
| HSON | BUY | 2013-08-29 | 2014-10-21 | $2.68 | $1K | -3.1% | -2.4% | -2.4% |
| RDNT | SELL | 2013-05-22 | 2013-05-23 | $2.43 | $183K | -10.6% | +0.3% | +0.3% |
| RDNT | SELL | 2009-09-21 | 2009-09-22 | $2.36 | $52K | -10.6% | +0.3% | +0.3% |
| RDNT | SELL | 2009-09-18 | 2009-09-21 | $2.33 | $182K | -10.6% | +0.3% | +0.3% |
| RDNT | SELL | 2009-09-17 | 2009-09-21 | $2.38 | $165K | -10.6% | +0.3% | +0.3% |
| RDNT | SELL | 2009-09-16 | 2009-09-18 | $2.35 | $72K | -10.6% | +0.3% | +0.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.