Samuel M. Zentman is Director at ACORN ENERGY, INC. (ACFN). They have made 5 open-market trades across 2 companies since 2006, most recently 2026-03-04.
CIK 0001309349
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 $110K since 2006, never a sale. Across 5 scored buys the stock is down 0.7% at ninety days, and 1.0 points behind the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 100% | 20% | 20% |
| Avg Move | +48.5% | -0.7% | -0.7% |
| Alpha | -132.2% | -1.0% | -1.0% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ACFN | BUY | 2010-12-17 | 2010-12-21 | $3.50 | $18K | +57.8% | -2.6% | -2.6% |
| ACFN | BUY | 2010-12-17 | 2011-01-18 | $3.70 | $19K | +57.8% | -2.6% | -2.6% |
| ACFN | BUY | 2010-10-20 | 2010-10-20 | $4.45 | $22K | +57.8% | -2.6% | -2.6% |
| ACFN | BUY | 2008-09-10 | 2008-09-11 | $3.81 | $38K | +57.8% | -2.6% | -2.6% |
| DSSI | BUY | 2006-07-31 | 2006-08-02 | $2.65 | $14K | +11.2% | +6.9% | +6.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.