What if you'd held PLUG?
A $1,000 investment in Plug Power, Inc. (PLUG) at the month-end close of 1999-10 would be worth $13.06 at the close of 2026-09 — -98.7% total return, dividends reinvested. The same $1,000 in the S&P 500, dividends reinvested, would be worth $9,181.
Your scenario
Result
If you'd bought $1,000 at the start of each year
Value of $1,000 invested on January 1 of each year, held to 2026-09, dividends included.
Every year, $1,000 from 1999
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1999 | $1,000 | — |
| 2000 | $520 | -48.0% |
| 2001 | $309 | -40.5% |
| 2002 | $159 | -48.6% |
| 2003 | $257 | +61.5% |
| 2004 | $216 | -15.7% |
| 2005 | $182 | -16.0% |
| 2006 | $138 | -24.2% |
| 2007 | $140 | +1.5% |
| 2008 | $36.11 | -74.2% |
| 2009 | $25.13 | -30.4% |
| 2010 | $13.10 | -47.9% |
| 2011 | $7.22 | -44.9% |
| 2012 | $1.77 | -75.5% |
| 2013 | $5.49 | +210.0% |
| 2014 | $10.62 | +93.5% |
| 2015 | $7.47 | -29.7% |
| 2016 | $4.25 | -43.1% |
| 2017 | $8.35 | +96.7% |
| 2018 | $4.39 | -47.5% |
| 2019 | $11.19 | +154.8% |
| 2020 | $120 | +973.1% |
| 2021 | $99.93 | -16.8% |
| 2022 | $43.79 | -56.2% |
| 2023 | $15.93 | -63.6% |
| 2024 | $7.54 | -52.7% |
| 2025 | $6.97 | -7.5% |
| 2026 | $7.40 | +6.1% |
Best and worst month-end to buy
The best single month-end close to have bought PLUG was 2013-04 ($0.16): $1,000 then is $13,063 today. The worst was 2000-02 ($1,174): $1,000 then is $1.78.
FAQ
What would $1,000 in PLUG be worth today?
A $1,000 investment in Plug Power, Inc. (PLUG) at the start of 1999 would be worth about $13.06 today, a total return of -98.7%. Dividends are reinvested in these figures.
What were the best and worst years for PLUG?
Plug Power, Inc. (PLUG)'s strongest calendar year since 1999 was 2020, a +973.1% return — $1,000 held through that year became about $10,731 by year-end. Its weakest year was 2012, at -75.5%.
Does the calculator include dividends and splits?
Yes where available. Prices are adjusted for both stock splits and reinvested dividends (total return), the same measure brokerages use.
How much would $100 per month in PLUG have grown?
Investing $100 at the end of every month since 1999-10 would have grown to about $23,057 on $32,400 invested.
Did PLUG beat the S&P 500?
Over the same period, $1,000 in the S&P 500 with dividends reinvested (the S&P 500 Total Return index) would be worth $9,181. PLUG trailed the S&P 500 by +99.9% in total return.
Is this investment advice?
No. Wall Street Regrets is an entertainment and education tool. Every number is a historical calculation, not a prediction, and past performance never guarantees future results.
Methodology
Plug Power, Inc. (PLUG) historical total-return data from 1999-10 to 2026-09, reduced to month-end closes for the tables above.
Returns use adjusted close prices — adjusted for stock splits and reinvested dividends, the same convention used by major brokerages. End-of-day and live prices come from EODHD; parts of the deep historical series are carried over from Yahoo Finance data. A "year" scenario invests $1,000 at the prior December's month-end close and values it at the latest available month-end close. Non-USD amounts are converted at historical month-end exchange rates (EODHD): to USD on the buy date and back to your currency at the latest rate, so the return reflects the currency move as well as the asset.
Month-end resolution means intra-month extremes are not captured in tables; the calculator uses exact trading-day closes where daily data is available. Figures ignore taxes, fees, and the currency effects of non-USD listings. History is not a forecast. Wall Street Regrets is entertainment, not investment advice.
What if you'd held…
Data: adjusted close prices via EODHD and Yahoo Finance. As of 2026-09-02. Not financial advice.