What if you'd held REGN?
A $1,000 investment in Regeneron Pharmaceuticals, Inc. (REGN) at the month-end close of 1991-04 would be worth $67,213 at the close of 2026-08 — +6621.3% total return, dividends reinvested. The same $1,000 in the S&P 500 would be worth $20,536.
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 1991
| Year | Value of $1,000 | Year return |
|---|---|---|
| 1991 | $1,000 | — |
| 1992 | $662 | -33.8% |
| 1993 | $855 | +29.2% |
| 1994 | $165 | -80.7% |
| 1995 | $703 | +325.3% |
| 1996 | $889 | +26.4% |
| 1997 | $472 | -46.9% |
| 1998 | $407 | -13.8% |
| 1999 | $703 | +72.8% |
| 2000 | $1,945 | +176.6% |
| 2001 | $1,553 | -20.1% |
| 2002 | $1,021 | -34.3% |
| 2003 | $811 | -20.6% |
| 2004 | $508 | -37.4% |
| 2005 | $877 | +72.7% |
| 2006 | $1,107 | +26.2% |
| 2007 | $1,332 | +20.3% |
| 2008 | $1,013 | -24.0% |
| 2009 | $1,334 | +31.7% |
| 2010 | $1,811 | +35.8% |
| 2011 | $3,057 | +68.8% |
| 2012 | $9,436 | +208.6% |
| 2013 | $15,182 | +60.9% |
| 2014 | $22,629 | +49.0% |
| 2015 | $29,944 | +32.3% |
| 2016 | $20,248 | -32.4% |
| 2017 | $20,738 | +2.4% |
| 2018 | $20,602 | -0.7% |
| 2019 | $20,711 | +0.5% |
| 2020 | $26,648 | +28.7% |
| 2021 | $34,834 | +30.7% |
| 2022 | $39,797 | +14.2% |
| 2023 | $48,445 | +21.7% |
| 2024 | $39,291 | -18.9% |
| 2025 | $42,812 | +9.0% |
| 2026 | $46,817 | +9.4% |
Best and worst month-end to buy
The best single month-end close to have bought REGN was 1994-12 ($2.97): $1,000 then is $283,111 today. The worst was 2024-08 ($1,174): $1,000 then is $716.
FAQ
What would $1,000 in REGN be worth today?
A $1,000 investment in Regeneron Pharmaceuticals, Inc. (REGN) at the start of 1991 would be worth about $67,213 today, a total return of +6621.3%. Dividends are reinvested in these figures.
What were the best and worst years for REGN?
Regeneron Pharmaceuticals, Inc. (REGN)'s strongest calendar year since 1991 was 1995, a +325.3% return — $1,000 held through that year became about $4,253 by year-end. Its weakest year was 1994, at -80.7%.
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 REGN have grown?
Investing $100 at the end of every month since 1991-04 would have grown to about $1.71M on $42,500 invested.
Did REGN beat the S&P 500?
Over the same period, $1,000 in the S&P 500 index would be worth $20,536. REGN beat the S&P 500 by +227.3% 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
Regeneron Pharmaceuticals, Inc. (REGN) historical total-return data from 1991-04 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.