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Insider Trading Intelligence
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MH

Maureen O. Helmer

PLUG
DIRECTOR · PLUG POWER INC · CIK 0001279977
FILING MIX · LIFETIME77%/23%
BUYS
47
SELLS
14
TOTAL VALUE
$4.64M
COMPANIES
1
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
39,753
AVG SELL PX
$8.48
TRADE KIND
SHOWING 61 / 61
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
7 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Maureen O. Helmer, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d7+28.57%+12.82%+0.59%+12.23%+16.83%—
14d7+14.29%+17.00%+1.73%+15.26%+10.06%—
30d7+14.29%+69.64%+3.02%+66.62%+29.16%—
60d7+0.00%+89.89%+8.40%+81.48%+87.16%—
90d7+0.00%+89.88%+9.73%+80.14%+85.50%—
180d7+14.29%+148.81%+19.17%+129.64%+105.22%—
1y7+14.29%+159.68%+33.92%+125.76%+25.56%—
2y7+42.86%+94.29%+21.92%+72.37%+25.32%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
PLUG · 39,753 shares · as of Jun 11, 2026
099,319198,639297,958397,277202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 47 buys / 14 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
39,753——39,753Jun 11, 2026Jun 16, 2026 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
39,753——361,318Jun 11, 2026Jun 16, 2026 ↗View →
PLUG
PLUG POWER INC
SALE10b5-1
10b5-1 plan
50,000$3.23$161.6K321,565Jun 8, 2026Jun 10, 2026 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
13,959$1.97$27.5K371,565Jan 2, 2026Jan 6, 2026 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
11,803$2.33$27.5K357,606Oct 1, 2025Oct 3, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
76,531——76,531Jul 3, 2025Jul 24, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
76,531——345,803Jul 3, 2025Jul 24, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
18,456$1.49$27.5K269,272Jul 1, 2025Jul 3, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
20,370$1.35$27.5K250,816Apr 1, 2025Apr 3, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,911$2.13$27.5K230,446Jan 2, 2025Jan 6, 2025 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,168$2.26$27.5K217,535Oct 1, 2024Oct 3, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
11,803$2.33$27.5K205,367Jul 1, 2024Jul 3, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
37,375——193,564Jun 5, 2024Jun 7, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
37,375——37,375Jun 5, 2024Jun 7, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
7,994$3.44$27.5K156,189Apr 1, 2024Apr 3, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
3,056$4.50$13.8K148,195Jan 2, 2024Jan 4, 2024 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
1,809$7.60$13.7K145,139Oct 2, 2023Oct 4, 2023 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,149——142,007Jun 27, 2023Jun 29, 2023 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,149——12,149Jun 27, 2023Jun 29, 2023 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
1,173$11.72$13.7K129,858Apr 3, 2023Apr 5, 2023 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
859$12.37$10.6K128,685Jan 3, 2023Jan 5, 2023 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
506$21.01$10.6K127,826Oct 3, 2022Oct 5, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
641$16.57$10.6K120,531Jul 1, 2022Jul 15, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
6,789——127,320Jun 30, 2022Jul 26, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
6,789——6,789Jun 30, 2022Jul 26, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
371$28.61$10.6K119,890Apr 1, 2022Apr 5, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
376$28.23$10.6K119,519Jan 3, 2022Jan 5, 2022 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
416$25.54$10.6K119,143Oct 1, 2021Oct 5, 2021 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
4,482——118,727Aug 16, 2021Aug 19, 2021 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
4,482——4,482Aug 16, 2021Aug 19, 2021 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
311$34.19$10.6K114,245Jul 15, 2021Jul 21, 2021 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
296$35.84$10.6K113,934Jul 15, 2021Jul 21, 2021 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
240——113,638Jan 4, 2021Jan 6, 2021 ↗View →
PLUG
PLUG POWER INC
SALE
10,000$30.00$300.0K113,398Dec 17, 2020Dec 21, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
15,011$26.11$392.0K123,698Dec 14, 2020Dec 16, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
300$27.14$8.1K123,398Dec 14, 2020Dec 16, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
35,000$15.00$525.0K138,709Oct 5, 2020Oct 7, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
606——173,709Oct 1, 2020Oct 5, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
75,000$13.28$996.2K173,103Sep 18, 2020Sep 22, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
990——248,103Jul 1, 2020Jul 6, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
29,621$2.11$62.5K397,277Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
29,621——0Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
29,343$2.13$62.5K367,656Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
10,000——0Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
29,343——0Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
30,000$1.76$52.8K338,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
10,000$1.22$12.2K258,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
1,200$5.10$6.1K248,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
10,000$5.63$56.3K278,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
1,200——0Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
30,000$2.62$78.6K308,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
150,164$6.29$944.5K247,113Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
30,000——0Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
10,000$0.38$3.8K268,313Jun 23, 2020Jun 25, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,807——12,807Jun 5, 2020Jun 9, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
12,807——247,113Jun 5, 2020Jun 9, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
115,000$4.29$492.9K234,306Apr 16, 2020Apr 20, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASE
65,000$1.93$125.5K349,306Apr 16, 2020Apr 20, 2020 ↗View →
PLUG
PLUG POWER INC
SALE
65,000——0Apr 16, 2020Apr 20, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
2,295$3.54$8.1K284,306Apr 1, 2020Apr 3, 2020 ↗View →
PLUG
PLUG POWER INC
PURCHASEGRANT
Stock grant
2,571$3.16$8.1K282,011Jan 2, 2020Jan 6, 2020 ↗View →
Other insiders · PLUG
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About this filer
CIK 0001279977
ROLE
Director
PRIMARY
PLUG
COMPANIES
1
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001279977DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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