What If You Invested $1,000 in Regeneron Pharmaceuticals (REGN)?
Enter any amount and start date. We use historical prices to show your hypothetical return.
Historical extremes
What if you bought at the best or worst time? Check max profit, max drawdown, and total return since IPO.
Max profit
+39,957%
(400.5 times)
- Buy
- Dec 30, 1994
- $2.98
- Sell
- Aug 27, 2024
- $1,193.7
Buying REGN at the best price and selling at the peak would have turned $1,000 into $400,570.47.
Max drawdown
91.80%
(fell to 8% of peak)
- Peak
- Feb 29, 2000
- $56.12
- Trough
- Apr 14, 2005
- $4.6
A $1,000 investment in REGN at the peak would have shrunk to $81.97 at the trough.
Return since IPO
+3,170%
(32.6 times)
- IPO
- Apr 2, 1991
- $20.99
- Current
- Apr 29, 2026
- $686.36
A $1,000 investment in REGN at IPO would be worth $32,699.38 today.
Frequently asked questions
What is Regeneron Pharmaceuticals (REGN) stock's all-time high (ATH) and all-time low (ATL)?
- Regeneron Pharmaceuticals (REGN) stock's all-time low (ATL) was $2.98 on Dec 30, 1994. The all-time high (ATH) was $1,193.7 on Aug 27, 2024.
What if you invested $1,000 in Regeneron Pharmaceuticals (REGN) stock for maximum profit?
- Buying Regeneron Pharmaceuticals (REGN) stock at the best price ($2.98 on Dec 30, 1994) and selling at the peak ($1,193.7 on Aug 27, 2024) would have turned $1,000 into $400,570.47. Historical return: +39,957.05% (400.5 times).
What are Regeneron Pharmaceuticals (REGN)'s best buy and sell dates for maximum profit?
- The best buy date for Regeneron Pharmaceuticals (REGN) stock was Dec 30, 1994 at $2.98. The best sell date was Aug 27, 2024 at $1,193.7. This investment would have returned +39,957.05% (400.5 times).
What was Regeneron Pharmaceuticals (REGN) stock's maximum drawdown?
- Regeneron Pharmaceuticals (REGN) stock's worst decline was 91.80% (fell to 8% of peak) from peak to trough. Peak: $56.12 on Feb 29, 2000. Trough: $4.6 on Apr 14, 2005. A $1,000 investment at the peak would have been worth $81.97 at the trough.
What if you bought Regeneron Pharmaceuticals (REGN) stock at IPO?
- A $1,000 investment in Regeneron Pharmaceuticals (REGN) stock at IPO ($20.99 on Apr 2, 1991) would be worth $32,699.38 today. Historical return: +3,169.94% (32.6 times). Current stock price: $686.36 as of Apr 29, 2026.
What if you invested $1,000 in Regeneron Pharmaceuticals (REGN) 5 years ago?
- A $1,000 investment in Regeneron Pharmaceuticals (REGN) stock 5 years ago ($481.75 on Apr 29, 2021) would be worth $1,424.72 today. Historical return: +42.47% (1.42 times). Current stock price: $686.36 as of Apr 29, 2026.
What if you invested $1,000 in Regeneron Pharmaceuticals (REGN) 10 years ago?
- A $1,000 investment in Regeneron Pharmaceuticals (REGN) stock 10 years ago ($374.18 on Apr 29, 2016) would be worth $1,834.3 today. Historical return: +83.43% (1.83 times). Current stock price: $686.36 as of Apr 29, 2026.
What if you invested $1,000 in Regeneron Pharmaceuticals (REGN) 20 years ago?
- A $1,000 investment in Regeneron Pharmaceuticals (REGN) stock 20 years ago ($14.42 on Apr 28, 2006) would be worth $47,597.78 today. Historical return: +4,659.78% (47.5 times). Current stock price: $686.36 as of Apr 29, 2026.
Data & methodology
How does the investment calculator work?
- Enter an investment amount and a start date. We use historical stock prices to calculate how many shares you would have bought, then apply the current price to show your hypothetical portfolio value and return.
What are Historical extremes?
- Max profit: the best buy and sell dates that maximize percentage return. Max drawdown: the largest peak-to-trough decline in price. Return since IPO: total return from IPO date to the latest price.
What is Max drawdown?
- Maximum drawdown is the largest peak-to-trough decline in price. It shows the worst drop from any prior high to a subsequent low. Peak and Trough are the dates and prices at which this decline occurred.
Does this include dividends?
- The calculator uses adjusted closing prices when available, which account for stock splits and dividends. For the most accurate results, we recommend using data that includes dividend adjustments.
Where does the price data come from?
- Historical prices are dividend-adjusted closing prices from our data provider. The calculator and Historical extremes use the same data source for consistent results.
How are the dollar amounts in the cards calculated?
- The dollar amounts in Historical extremes use the investment amount you select in the calculator above (e.g. $1,000). They show what your investment would have been worth at the Buy/Peak/IPO date versus the Sell/Trough/Current date.
What date range can I use?
- The available date range depends on our historical price data for REGN. You can select any date between our first and most recent data point.
Explore more
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REGN Dividend Profile
Yield: 0.52%. See full history.
REGN Dividend Calculator
How much dividend income would $1,000 have earned? Calculate from any date.
REGN Dividend Forecast
Project future income with DRIP, growth assumptions, and optional monthly contributions.
REGN Financials
Revenue, EPS, EBITDA, market cap, debt and balance sheet history with annual and quarterly data.