Leonard Osser is CEO at MILESTONE SCIENTIFIC INC. (MLSS). They have made 19 open-market trades across 3 companies since 2011, most recently 2025-09-29.
CIK 0001188354
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.
8 open-market purchases totalling $402K since 2011, against 11 sales. Across 5 scored buys the stock is down 21.2% at ninety days, and 23.1 points behind the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 40% | 40% | 20% |
| Avg Move | -7.7% | -4.0% | -21.2% |
| Alpha | -5.7% | -5.6% | -23.1% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MLSS | SELL | 2024-10-22 | 2024-10-23 | $0.93 | $201K | -1.5% | -5.7% | +54.7% |
| MLSS | SELL | 2024-08-21 | 2024-08-21 | $0.95 | $270K | +3.1% | +8.2% | -36.7% |
| NXL | BUY | 2022-09-28 | 2022-09-29 | $1.12 | $11K | +10.6% | +30.1% | -33.9% |
| NXL | BUY | 2022-09-16 | 2022-09-20 | $4.15 | $149K | -33.3% | -18.5% | -50.6% |
| MLSS | SELL · 10b5-1 | 2022-04-18 | 2022-04-20 | $1.12 | $11K | -3.2% | -30.4% | -20.0% |
| MLSS | SELL · 10b5-1 | 2022-04-11 | 2022-04-13 | $1.19 | $20K | -13.0% | -26.9% | +1.7% |
| MLSS | SELL · 10b5-1 | 2022-04-01 | 2022-04-04 | $1.45 | $29K | -21.1% | -19.0% | -28.6% |
| MLSS | SELL · 10b5-1 | 2022-03-28 | 2022-03-29 | $1.33 | $9K | -18.7% | -32.0% | -34.7% |
| MLSS | SELL · 10b5-1 | 2022-03-21 | 2022-03-22 | $1.28 | $20K | +14.3% | -10.3% | -33.3% |
| MLSS | SELL · 10b5-1 | 2022-03-14 | 2022-03-15 | $1.20 | $20K | +7.5% | -3.3% | -31.6% |
| MLSS | SELL · 10b5-1 | 2022-03-07 | 2022-03-08 | $1.43 | $20K | +3.7% | -10.3% | -29.4% |
| MLSS | SELL · 10b5-1 | 2022-02-28 | 2022-03-02 | $1.32 | $20K | -14.3% | +2.9% | -27.9% |
| MLSS | SELL · 10b5-1 | 2022-02-22 | 2022-02-23 | $1.25 | $20K | +20.0% | +7.5% | -25.8% |
| MLSS | SELL · 10b5-1 | 2022-02-14 | 2022-02-15 | $1.21 | $20K | +8.1% | +4.9% | -31.6% |
| MLSS | SELL · 10b5-1 | 2022-02-07 | 2022-02-08 | $1.28 | $20K | +6.3% | +6.3% | -24.8% |
| MLSS | SELL · 10b5-1 | 2022-01-31 | 2022-02-01 | $1.29 | $20K | -11.6% | -3.6% | -12.3% |
| MLSS | SELL · 10b5-1 | 2022-01-24 | 2022-01-25 | $1.45 | $20K | -22.3% | -20.4% | -31.8% |
| MLSS | SELL · 10b5-1 | 2022-01-18 | 2022-01-19 | $1.72 | $20K | -27.1% | -23.2% | -35.0% |
| MLSS | SELL · 10b5-1 | 2022-01-10 | 2022-01-11 | $2.02 | $20K | -27.9% | -37.8% | -39.3% |
| MLSS | SELL · 10b5-1 | 2022-01-04 | 2022-01-06 | $2.09 | $9K | -12.8% | -36.9% | -36.0% |
| MLSS | SELL · 10b5-1 | 2022-01-03 | 2022-01-03 | $2.15 | $11K | -17.3% | -39.5% | -30.5% |
| MLSS | SELL · 10b5-1 | 2021-12-27 | 2021-12-28 | $2.09 | $20K | +0.0% | -39.7% | -34.4% |
| MLSS | SELL · 10b5-1 | 2021-12-20 | 2021-12-21 | $2.03 | $20K | +7.4% | -16.8% | -35.6% |
| MLSS | SELL · 10b5-1 | 2021-12-15 | 2021-12-16 | $1.96 | $12K | -1.0% | -18.8% | -43.5% |
| MLSS | SELL · 10b5-1 | 2021-12-13 | 2021-12-14 | $1.93 | $8K | +10.1% | -3.2% | -36.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.