What If You Invested $1,000 in Biogen (BIIB)?
Enter any amount and start date. We use historical prices to show your hypothetical return.
BIIB
Historical extremes
What if you bought at the best or worst time? Check max profit, max drawdown, and total return since IPO.
Max profit
+134,293%
(1,343 times)
- Buy
- Dec 16, 1994
- $0.35
- Sell
- Mar 20, 2015
- $475.98
Buying BIIB at the best price and selling at the peak would have turned $1,000 into $1,343,930.88.
Max drawdown
90.00%
(fell to 10% of peak)
- Peak
- Oct 16, 1991
- $3.54
- Trough
- Dec 16, 1994
- $0.35
A $1,000 investment in BIIB at the peak would have shrunk to $100.05 at the trough.
Return since IPO
+6,110%
(62.1 times)
- IPO
- Sep 17, 1991
- $3.13
- Current
- Apr 29, 2026
- $194.38
A $1,000 investment in BIIB at IPO would be worth $62,102.24 today.
Frequently asked questions
What is Biogen (BIIB) stock's all-time high (ATH) and all-time low (ATL)?
- Biogen (BIIB) stock's all-time low (ATL) was $0.35 on Dec 16, 1994. The all-time high (ATH) was $475.98 on Mar 20, 2015.
What if you invested $1,000 in Biogen (BIIB) stock for maximum profit?
- Buying Biogen (BIIB) stock at the best price ($0.35 on Dec 16, 1994) and selling at the peak ($475.98 on Mar 20, 2015) would have turned $1,000 into $1,343,930.88. Historical return: +134,293.09% (1,343 times).
What are Biogen (BIIB)'s best buy and sell dates for maximum profit?
- The best buy date for Biogen (BIIB) stock was Dec 16, 1994 at $0.35. The best sell date was Mar 20, 2015 at $475.98. This investment would have returned +134,293.09% (1,343 times).
What was Biogen (BIIB) stock's maximum drawdown?
- Biogen (BIIB) stock's worst decline was 90.00% (fell to 10% of peak) from peak to trough. Peak: $3.54 on Oct 16, 1991. Trough: $0.35 on Dec 16, 1994. A $1,000 investment at the peak would have been worth $100.05 at the trough.
What if you bought Biogen (BIIB) stock at IPO?
- A $1,000 investment in Biogen (BIIB) stock at IPO ($3.13 on Sep 17, 1991) would be worth $62,102.24 today. Historical return: +6,110.22% (62.1 times). Current stock price: $194.38 as of Apr 29, 2026.
What if you invested $1,000 in Biogen (BIIB) 5 years ago?
- A $1,000 investment in Biogen (BIIB) stock 5 years ago ($265.33 on Apr 29, 2021) would be worth $732.6 today. Historical return: 26.74% (0.73 times). Current stock price: $194.38 as of Apr 29, 2026.
What if you invested $1,000 in Biogen (BIIB) 10 years ago?
- A $1,000 investment in Biogen (BIIB) stock 10 years ago ($274.99 on Apr 29, 2016) would be worth $706.86 today. Historical return: 29.31% (0.71 times). Current stock price: $194.38 as of Apr 29, 2026.
What if you invested $1,000 in Biogen (BIIB) 20 years ago?
- A $1,000 investment in Biogen (BIIB) stock 20 years ago ($44.85 on Apr 28, 2006) would be worth $4,334 today. Historical return: +333.40% (4.33 times). Current stock price: $194.38 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 BIIB. You can select any date between our first and most recent data point.
Explore more
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