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Plug Power Inc. (PLUG)

Plug Power Inc. at a glance — key fundamentals, SEC filings, insider buying and selling, and earnings dates.

Plug Power Inc. (PLUG) is a Electrical Equipment & Parts company based in US with a market capitalization of $4.6B. Revenue grew 12.9% year-over-year and free cash flow was negative at -$661.5M. This page tracks PLUG's SEC filings, insider buying and selling, earnings dates, and key fundamentals in one place.

US · 3.22K employees · IPO Oct 29, 1999

Valuation

Valuation & price

$3.78 · as of May 17, 2026 · -8.7% vs 52w high

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P/E ratio

Latest-FY diluted EPS

4.67

P/B ratio

Market cap ÷ book equity

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Dividend yield

Price — last 12 months

$4.13$2.75$1.37Jul 25Dec 25Jul 26Jul 7, 25$1.37Jul 9, 25$1.78Jul 11, 25$1.62Jul 15, 25$1.53Jul 17, 25$1.65Jul 21, 25$1.82Jul 23, 25$1.81Jul 25, 25$1.84Jul 29, 25$1.59Jul 31, 25$1.50Aug 4, 25$1.45Aug 6, 25$1.46Aug 11, 25$1.58Aug 13, 25$1.66Aug 15, 25$1.70Aug 19, 25$1.58Aug 21, 25$1.54Aug 25, 25$1.67Aug 27, 25$1.62Aug 29, 25$1.57Sep 3, 25$1.49Sep 5, 25$1.46Sep 9, 25$1.41Sep 11, 25$1.51Sep 16, 25$1.68Sep 18, 25$2.10Sep 22, 25$2.65Sep 24, 25$2.40Sep 26, 25$2.37Sep 30, 25$2.33Oct 2, 25$2.83Oct 6, 25$4.13Oct 8, 25$3.66Oct 10, 25$3.42Oct 14, 25$4.05Oct 16, 25$3.48Oct 21, 25$3.12Oct 23, 25$2.88Oct 27, 25$2.96Oct 29, 25$2.76Oct 31, 25$2.69Nov 4, 25$2.52Nov 6, 25$2.51Nov 10, 25$2.56Nov 12, 25$2.73Nov 14, 25$2.25Nov 18, 25$2.14Nov 20, 25$1.89Nov 25, 25$1.95Nov 28, 25$2.01Dec 2, 25$2.11Dec 4, 25$2.23Dec 8, 25$2.16Dec 10, 25$2.26Dec 12, 25$2.32Dec 16, 25$2.29Dec 18, 25$2.26Dec 22, 25$2.11Dec 24, 25$2.10Dec 29, 25$1.97Jan 2, 26$2.23Jan 6, 26$2.39Jan 8, 26$2.32Jan 12, 26$2.28Jan 14, 26$2.35Jan 16, 26$2.36Jan 21, 26$2.22Jan 23, 26$2.50Jan 27, 26$2.41Jan 29, 26$2.34Feb 2, 26$2.08Feb 4, 26$2.05Feb 9, 26$2.10Feb 11, 26$1.96Feb 13, 26$1.89Feb 18, 26$1.86Feb 20, 26$1.87Feb 24, 26$1.91Feb 26, 26$1.91Mar 2, 26$1.81Mar 4, 26$2.48Mar 6, 26$2.13Mar 10, 26$2.12Mar 12, 26$2.21Mar 17, 26$2.33Mar 19, 26$2.40Mar 23, 26$2.31Mar 25, 26$2.27Mar 27, 26$2.18Mar 31, 26$2.26Apr 2, 26$2.41Apr 7, 26$2.52Apr 9, 26$2.74Apr 13, 26$2.77Apr 15, 26$2.93Apr 17, 26$2.78Apr 22, 26$3.19Apr 24, 26$3.14Apr 28, 26$3.03Apr 30, 26$3.13May 4, 26$3.13May 6, 26$3.31May 8, 26$3.12May 12, 26$3.56May 14, 26$3.79May 18, 26$3.45May 20, 26$3.31May 22, 26$3.78May 28, 26$4.12Jun 1, 26$3.94Jun 3, 26$3.69Jun 5, 26$3.22Jun 9, 26$2.91Jun 11, 26$2.83Jun 15, 26$2.80Jun 17, 26$2.65Jun 22, 26$2.79Jun 24, 26$2.61Jun 26, 26$2.54Jul 2, 26$2.64
$1.3752-week range$4.14
Loading valuation history…

Fundamentals

Key fundamentals

$4.6B

Market cap

12.9%

Revenue growth (YoY)

-34.1%

Gross margin

-$661.5M

Free cash flow (USD)

$441.9M

Net debt

35.0%

Share dilution

1/5

Graham criteria passed

Defensive-investor screen

Industrials

Sector

Trajectory

Long-term trends

Revenue by year

2016 → 2025

FY 2016$85.9MFY 2017$132.9MFY 2018$174.6MFY 2019$230.0MFY 2020$-93.2MFY 2021$502.3MFY 2022$701.4MFY 2023$891.3MFY 2024$628.8MFY 2025$709.9M
$85.9M$709.9M

Free cash flow by year

2016 → 2025

FY 2016$-87.7MFY 2017$-104.5MFY 2018$-77.2MFY 2019$-65.5MFY 2020$-205.7MFY 2021$-551.4MFY 2022$-1.1BFY 2023$-1.8BFY 2024$-1.1BFY 2025$-661.5M
-$87.7M-$661.5M

Gross margin by year

2021 → 2025

FY 2021-34.1%FY 2022-27.7%FY 2023-57.0%FY 2024-99.4%FY 2025-34.1%
-34.1%-34.1%

Value screen

Graham defensive-investor tests

Computing the scorecard — refreshing any stale inputs…

0

Insider buys · 90 days

1

Insider sells · 90 days

Earnings

Last report: 10-Q filed May 11, 2026

Next expected: not yet scheduled

On the tape

Recent SEC & insider activity

  • 8-K eventAnnual Meeting ResultsJun 15, 2026Filing
  • 8-K eventAnnual Meeting AnnouncementJun 11, 2026Filing
  • Insider sellInsider Sell $162K · 10b5-1 PlanHELMER MAUREEN O · Director · $161.6KJun 10, 2026Filing
  • 8-K eventDirector ResignationJun 4, 2026Filing
  • 8-K eventEarnings ReleaseMay 11, 2026Filing
  • Quarterly report10-Q FiledMay 11, 2026Filing

Questions

Frequently asked questions

What is Plug Power Inc.'s market cap?

Plug Power Inc. (PLUG) has a market capitalization of $4.6B.

What is PLUG's P/E ratio?

A meaningful P/E ratio is not available for PLUG — the company's latest fiscal-year earnings per share is zero, negative, or not yet cached.

What is PLUG's price-to-book (P/B) ratio?

PLUG trades at 4.67 times book value per share.

Are insiders buying PLUG stock?

SEC Form 4 filings show no open-market insider buys at Plug Power Inc. in the last 90 days (1 sell).

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Timeline

Every filing, insider trade & earnings on a price-anchored timeline

Filing Analyzer

Search the actual 10-K / 10-Q text with AI research angles

News

Latest press coverage in one feed

Data: SEC EDGAR filings and cached fundamental data; prices and ratios use the most recent cached quote and statements (may lag by up to a day). Educational and research purposes only. Not investment advice.