What if you'd held ERII?
A $1,000 investment in Energy Recovery, Inc. (ERII) at the month-end close of 2008-07 would be worth $716 at the close of 2026-08 — -28.4% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $6,082.
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 2026-08, dividends included.
Every year, $1,000 from 2008
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2008 | $1,000 | — |
| 2009 | $908 | -9.2% |
| 2010 | $483 | -46.8% |
| 2011 | $340 | -29.5% |
| 2012 | $449 | +31.8% |
| 2013 | $732 | +63.2% |
| 2014 | $695 | -5.0% |
| 2015 | $933 | +34.2% |
| 2016 | $1,365 | +46.4% |
| 2017 | $1,154 | -15.5% |
| 2018 | $888 | -23.1% |
| 2019 | $1,292 | +45.5% |
| 2020 | $1,799 | +39.3% |
| 2021 | $2,835 | +57.6% |
| 2022 | $2,703 | -4.7% |
| 2023 | $2,485 | -8.1% |
| 2024 | $1,939 | -22.0% |
| 2025 | $1,780 | -8.2% |
| 2026 | $1,044 | -41.4% |
Best and worst month-end to buy
The best single month-end close to have bought ERII was 2012-04 ($2.10): $1,000 then is $3,767 today. The worst was 2023-07 ($30.48): $1,000 then is $260.
FAQ
What would $1,000 in ERII be worth today?
A $1,000 investment in Energy Recovery, Inc. (ERII) at the start of 2008 would be worth about $716 today, a total return of -28.4%. Dividends are reinvested in these figures.
What were the best and worst years for ERII?
Energy Recovery, Inc. (ERII)'s strongest calendar year since 2008 was 2013, a +63.2% return — $1,000 held through that year became about $1,632 by year-end. Its weakest year was 2010, at -46.8%.
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 ERII have grown?
Investing $100 at the end of every month since 2008-07 would have grown to about $26,997 on $21,800 invested.
Did ERII beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $6,082. ERII trailed the S&P 500 by +88.2% 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
Energy Recovery, Inc. (ERII) historical total-return data from 2008-07 to 2026-08, reduced to month-end closes for the tables above.
Returns use adjusted close prices from Yahoo Finance historical data — adjusted for stock splits and reinvested dividends — the same convention used by major brokerages. 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 (Yahoo Finance): 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 Yahoo Finance. As of 2026-08. Not financial advice.