Andrew Marsh is CEO & President at PLUG POWER INC (PLUG). They have made 12 open-market trades across 2 companies since 2010, most recently 2026-05-27.
CIK 0001431827
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 $156K since 2010, against 7 sales. Across 5 scored buys the stock is up 7.2% at ninety days, and 6.5 points ahead of the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 20% | 100% | 100% |
| Avg Move | -9.3% | +6.0% | +7.2% |
| Alpha | -4.5% | +5.2% | +6.5% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| GEVO | SELL · 10b5-1 | 2023-08-23 | 2023-08-25 | $1.38 | $23K | +2.3% | -7.5% | -11.3% |
| GEVO | SELL · 10b5-1 | 2023-06-06 | 2023-06-07 | $1.54 | $21K | -15.4% | -3.1% | -19.8% |
| GEVO | SELL | 2022-11-21 | 2022-11-23 | $2.04 | $171K | -9.7% | -13.5% | -12.1% |
| PLUG | SELL · 10b5-1 | 2021-01-19 | 2021-01-21 | $65.82 | $37.7M | +3.1% | -22.0% | -56.4% |
| PLUG | SELL | 2020-08-28 | 2020-09-01 | $12.96 | $7.0M | -12.6% | -0.0% | +88.5% |
| PLUG | SELL | 2020-08-19 | 2020-08-21 | $13.76 | $6.0M | +1.1% | +2.8% | +83.0% |
| PLUG | SELL | 2020-07-06 | 2020-07-08 | $10.01 | $23.4M | -8.0% | +20.6% | +73.6% |
| PLUG | SELL | 2020-06-23 | 2020-06-25 | $7.26 | $15.8M | +31.0% | +15.2% | +66.6% |
| PLUG | SELL | 2020-06-04 | 2020-06-08 | $5.03 | $10.7M | +4.7% | +84.5% | +127.8% |
| PLUG | SELL | 2020-02-18 | 2020-02-24 | $5.08 | $10.1M | -16.5% | -29.4% | -22.4% |
| PLUG | BUY | 2019-03-14 | 2019-03-15 | $2.44 | $30K | +3.5% | +10.1% | +16.2% |
| PLUG | BUY | 2013-08-20 | 2013-08-23 | $0.38 | $12K | -12.5% | +5.0% | +5.0% |
| PLUG | BUY | 2013-06-12 | 2013-06-14 | $0.21 | $36K | -12.5% | +5.0% | +5.0% |
| PLUG | BUY | 2011-05-31 | 2011-06-02 | $2.42 | $48K | -12.5% | +5.0% | +5.0% |
| PLUG | BUY | 2010-03-22 | 2010-03-22 | $0.59 | $30K | -12.5% | +5.0% | +5.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.