What if you'd held RGEN?
A $1,000 investment in Repligen Corporation (RGEN) at the month-end close of 1986-04 would be worth $16,033 at the close of 2026-08 — +1503.3% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $32,727.
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 1986
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1986 | $1,000 | — |
| 1987 | $914 | -8.6% |
| 1988 | $800 | -12.5% |
| 1989 | $1,143 | +42.9% |
| 1990 | $1,429 | +25.0% |
| 1991 | $1,771 | +24.0% |
| 1992 | $1,086 | -38.7% |
| 1993 | $786 | -27.6% |
| 1994 | $200 | -74.5% |
| 1995 | $129 | -35.7% |
| 1996 | $136 | +5.6% |
| 1997 | $89.26 | -34.3% |
| 1998 | $146 | +64.0% |
| 1999 | $357 | +144.0% |
| 2000 | $386 | +8.0% |
| 2001 | $278 | -28.0% |
| 2002 | $347 | +25.1% |
| 2003 | $499 | +43.8% |
| 2004 | $329 | -34.1% |
| 2005 | $457 | +38.9% |
| 2006 | $321 | -29.8% |
| 2007 | $749 | +133.1% |
| 2008 | $432 | -42.3% |
| 2009 | $470 | +8.7% |
| 2010 | $536 | +14.1% |
| 2011 | $397 | -26.0% |
| 2012 | $718 | +81.0% |
| 2013 | $1,559 | +117.2% |
| 2014 | $2,263 | +45.2% |
| 2015 | $3,233 | +42.9% |
| 2016 | $3,522 | +8.9% |
| 2017 | $4,146 | +17.7% |
| 2018 | $6,027 | +45.4% |
| 2019 | $10,571 | +75.4% |
| 2020 | $21,901 | +107.2% |
| 2021 | $30,267 | +38.2% |
| 2022 | $19,350 | -36.1% |
| 2023 | $20,549 | +6.2% |
| 2024 | $16,450 | -19.9% |
| 2025 | $18,727 | +13.8% |
| 2026 | $20,155 | +7.6% |
Best and worst month-end to buy
The best single month-end close to have bought RGEN was 1996-07 ($0.69): $1,000 then is $256,337 today. The worst was 2021-10 ($291): $1,000 then is $607.
FAQ
What would $1,000 in RGEN be worth today?
A $1,000 investment in Repligen Corporation (RGEN) at the start of 1986 would be worth about $16,033 today, a total return of +1503.3%. Dividends are reinvested in these figures.
What were the best and worst years for RGEN?
Repligen Corporation (RGEN)'s strongest calendar year since 1986 was 1999, a +144.0% return — $1,000 held through that year became about $2,440 by year-end. Its weakest year was 1994, at -74.5%.
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 RGEN have grown?
Investing $100 at the end of every month since 1986-04 would have grown to about $1.82M on $48,500 invested.
Did RGEN beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $32,727. RGEN trailed the S&P 500 by +51.0% 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
Repligen Corporation (RGEN) historical total-return data from 1986-04 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.