Jason L. Vollmer is CFO at MDU RESOURCES GROUP INC (MDU). They have made 5 open-market trades across 1 company since 2020, most recently 2026-02-18.
CIK 0001626019
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.
5 open-market purchases totalling $320K since 2020, never a sale. Across 5 scored buys the stock is up 12.3% at ninety days, and 1.7 points ahead of the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| MDU | 324,976 | $6.2M |
Shares reported on the most recent Form 4, priced at the 2026-02-19 close.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 60% | 60% | 80% |
| Avg Move | -2.8% | +2.3% | +12.3% |
| Alpha | -1.6% | -1.1% | +1.7% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MDU | BUY | 2025-09-08 | 2025-09-09 | $16.08 | $161K | +3.6% | +16.1% | +20.0% |
| MDU | BUY | 2025-08-19 | 2025-08-19 | $16.28 | $81K | -1.7% | -2.9% | +23.4% |
| MDU | BUY | 2020-11-11 | 2020-11-12 | $24.93 | $25K | +4.9% | +2.9% | +10.7% |
| MDU | BUY | 2020-05-13 | 2020-05-14 | $19.62 | $20K | +12.3% | +5.4% | +17.0% |
| MDU | BUY | 2020-03-09 | 2020-03-10 | $27.31 | $33K | -33.0% | -10.1% | -9.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.