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.
Regeneron Pharmaceuticals
REGN
Historical extremes
Maximum profit (buy at all-time low, sell at peak), maximum drawdown (peak to trough), and total return from IPO to current price.
Max profit
+39958.67% (400.6 times)
- Buy
- Dec 30, 1994
- $2.98
- Sell
- Aug 27, 2024
- $1,195.13
Buying REGN at the all-time low and selling at the peak would have turned $1,000 into $400,586.67.
Max drawdown
-91.81% (fell to 8% of peak)
- Peak
- Feb 29, 2000
- $56.19
- Trough
- Apr 14, 2005
- $4.6
The worst decline for REGN was -91.81% (fell to 8% of peak) from peak to trough.
IPO to current
+3502.88% (36.0 times)
- IPO
- Apr 2, 1991
- $21.01
- Current
- Mar 16, 2026
- $756.91
A $1,000 investment in REGN at IPO would be worth $36,028.78 today.
Dollar amounts based on selected investment ($1,000)
Frequently asked questions
What is Regeneron Pharmaceuticals (REGN) stock's all-time high and all-time low?
- Regeneron Pharmaceuticals (REGN) stock's all-time low was $2.98 on Dec 30, 1994. The all-time high was $1,195.13 on Aug 27, 2024.
What if you invested $1,000 in Regeneron Pharmaceuticals (REGN) stock at the all-time low?
- Buying Regeneron Pharmaceuticals (REGN) stock at the all-time low ($2.98 on Dec 30, 1994) and selling at the peak ($1,195.13 on Aug 27, 2024) would have turned $1,000 into $400,586.67. Historical return: +39958.67% (400.6 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 (all-time low at $2.98). The best sell date was Aug 27, 2024 at $1,195.13. This investment would have returned +39958.67% (400.6 times).
What was Regeneron Pharmaceuticals (REGN) stock's maximum drawdown?
- Regeneron Pharmaceuticals (REGN) stock's worst decline was -91.81% (fell to 8% of peak) from peak to trough. Peak: $56.19 on Feb 29, 2000. Trough: $4.6 on Apr 14, 2005. A $1,000 investment at the peak would have been worth $81.95 at the trough.
What if you bought Regeneron Pharmaceuticals (REGN) stock at IPO?
- A $1,000 investment in Regeneron Pharmaceuticals (REGN) stock at IPO ($21.01 on Apr 2, 1991) would be worth $36,028.78 today. Historical return: +3502.88% (36.0 times). Current stock price: $756.91 as of Mar 16, 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 ($479.51 on Mar 16, 2021) would be worth $1,578.51 today. Historical return: +57.85% (1.58 times). Current stock price: $756.91 as of Mar 16, 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 ($366.43 on Mar 16, 2016) would be worth $2,065.65 today. Historical return: +106.56% (2.07 times). Current stock price: $756.91 as of Mar 16, 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 ($16.88 on Mar 16, 2006) would be worth $44,850.2 today. Historical return: +4385.02% (44.9 times). Current stock price: $756.91 as of Mar 16, 2026.
About this data
- 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: buy at all-time low, sell at the highest price after. Max drawdown: the largest peak-to-trough decline in price. IPO to current: 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 from Yahoo Finance, adjusted for stock splits and dividends. We use adjusted close for all calculations.
- 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.