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Plug Power PLUG

$1.89 −$0.01 (-0.53%)
Pre-market · Oct 6, 6:00 am ET · After hours $1.89 0.00%
Open$1.90
Prev close$1.90
Day range$1.83 – $1.90
Volume42.07M
Market cap$2.64B
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership62.8%-0.39 pts vs. prior quarter
Institutions holding571-1 vs. prior quarter
Insider trades (recent)44 buys / 6 sellsNet buying
Short interest20.56% of floatDays to cover 6.1 · as of 15 Sep 2026
Short-sale volume share18.1%5-day average of daily volume

Short-sale volume as % of daily volume

12%15%19%22%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$7.51M (12 inflow days, 8 outflow days).

The five largest holders on file together own 29.8% of shares outstanding.

Largest holders

  • BlackRock13.17%
  • Vanguard Capital Management, LLC5.22%
  • Vanguard Portfolio Management, LLC4.74%
  • Grove Energy Capital LLC3.93%
  • State Street Global Advisors2.77%
  • Geode Capital Management, LLC2.62%
  • UBS Asset Management2.57%
  • Citadel Advisors LLC1.73%

By investor type

  • Mutual Fund46.34%
  • Hedge Fund8.00%
  • Private Company4.79%
  • Public Company2.82%
  • Individual/Insider0.62%
  • Insurance Company0.39%
  • Government Pension Fund0.32%
  • Family Office/Trust0.09%

Reported short interest has fallen from 24.42% to 20.56% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 287,260,138 20.6% 6.1
31 Aug 2026 290,960,720 20.8% 5.2
14 Aug 2026 290,919,389 20.8% 4.0
31 Jul 2026 294,021,600 21.1% 6.0
15 Jul 2026 330,057,977 23.7% 6.9
30 Jun 2026 340,731,106 24.4% 6.0

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