How to Buy Biogen Stock
Biogen Inc
Biogen Inc. discovers, develops, manufactures, and delivers therapies for treating neurological and neurodegenerative diseases.
Biogen stock last closed at $171.50, down 2.41% from the previous day, and has increased 13.96% in one year. It has underperformed other stocks in the Drug Manufacturers - General industry by 0.14 percentage points. Biogen stock is currently +55.86% from its 52-week low of $110.04, and -7.38% from its 52-week high of $185.17.
As of Dec 16, 2025, there are 146.7M BIIB shares outstanding. The market value of BIIB is $25.16B. In the past 24 hours, 2.41M BIIB shares were traded.
How to Buy Biogen Stock
Not sure how to invest in Biogen stock? Here's how.
- Decide where to buy Biogen stock: You need to choose an online brokerage, but don't worry - we've tried dozens of online brokerages and apps to help you decide where to buy Biogen stock.
- Sign up for a brokerage account: Sign up for 0% commission trading with the highest-rated brokerage we've selected.
- Deposit funds into your brokerage account: Choose your payment method and add your info.
- Analyze Biogen stock: The Biogen ticker symbol is BIIB. Is Biogen stock a good investment? Should you buy shares of BIIB? How do BIIB's underlying business fundamentals look? Do top analysts think Biogen is a good buy? Why has BIIB's stock price moved recently? (Hint: Our stock research tools can help you understand if BIIB is a good stock to buy).
- Place your BIIB trade: Decide if you will purchase BIIB shares at the current market price or use a limit order to purchase BIIB shares at a specific price.
- Watch your BIIB investment: Create a watchlist to track your new investment in Biogen stock.
Step 1: Decide where to buy Biogen stock
You will need an online brokerage account in order to access the NASDAQ market and buy BIIB shares.
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Open eToro AccountStep 2: Sign up for a brokerage account
Now that you've chosen the right brokerage, you'll need to fill out some personal information so you can invest in BIIB today.
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Step 3: Deposit funds into your brokerage account
Now that you've filled out your info on the stocks app, you need to deposit funds:
Check out the walkthrough below to see the process of transferring money into your new brokerage account.
Step 4: Analyze Biogen stock
After you have decided on the best place to buy Biogen stock, it's crucial to analyze their stock before you invest, so you can wrap your head around the risk as well as the opportunity.
Biogen stock data
BIIB Overview
WallStreetZen was built to help part-time investors do better fundamental analysis in minutes instead of hours.
You can see all of the due diligence checks on BIIB's stock page.
Is BIIB stock undervalued?
Investors use many financial metrics, analyses, models, and charts to gauge BIIB's intrinsic value.
Using relative valuations metrics:
- BIIB could be undervalued based on its P/E ratio of 15.61x, relative to Drug Manufacturers - General industry P/E ratio of 45.21x
- BIIB could be undervalued based on its P/B ratio of 1.38x, relative to Drug Manufacturers - General industry P/B ratio of 6.83x
- BIIB may be overvalued based on its PEG ratio of 1.17x
You can do additional valuation research on BIIB's stock here.
BIIB Financials at a glance
Pros:
- There are more short-term assets than short-term liabilities on the BIIB balance sheet.
- There are more short-term assets than long-term liabilities on the BIIB balance sheet.
- Total BIIB debt is lower than 5 years ago, relative to shareholder equity.
- BIIB's operating cash flow of $2.45B allows it to safely service it's debt of $6.59B.
- BIIB earnings of $1.90B is not sufficient to cover its interest payments.
Cons:
- BIIB has a relatively high debt to equity ratio of 0.6.
- BIIB profit margin has gone down from 16.8% to 16% in the past year.
Is it a good time to buy Biogen stock, according to analysts?
Out of 10 Wall Street analysts who track BIIB, the consensus analyst rating on Biogen is a Buy
It's important to note that analyst forecasts are not recommendations, nor are they financial advice.
Most Recent BIIB Analyst Ratings
William Pickering, a bottom 13% analyst from Bernstein maintains BIIB with a hold rating and raises their BIIB price target from $155.00 to $157.00, on Nov 3, 2025.
Brian Abrahams, a top 16% analyst from RBC Capital maintains BIIB with a buy rating and lowers their BIIB price target from $217.00 to $210.00, on Oct 31, 2025.
Andrew Tsai, a top 30% analyst from Jefferies initiates coverage on BIIB with a strong buy rating and announces their BIIB price target of $190.00, on Sep 25, 2025.
Jefferies's Andrew Tsai initiated their coverage on Biogen (NASDAQ: BIIB) with a Strong Buy rating and a $190 price target.
Biogen will report its Q3 2025 earnings on 2025/10/30.
In a quarterly preview note, Tsai said investors appear to have low expectations based on an awareness of Biogen's key risks.
That said, the analyst added that the stock currently offers a favorable risk/reward ratio because the Street is assigning it a "near-no-pipeline" value.
Looking ahead, Tsai said the stock could "grind higher" if there are any positive developments in 2026, such as an acceleration in Leqembi sales in Alzheimer's, a resilient base business, or a successful late-stage pipeline.
Geoff Meacham, a top 12% analyst from Citigroup maintains BIIB with a hold rating and raises their BIIB price target from $125.00 to $135.00, on Aug 1, 2025.
Andrew Fein, a top 1% analyst from HC Wainwright & Co. maintains BIIB with a buy rating and raises their BIIB price target from $187.00 to $194.00, on Aug 1, 2025.
You can dig deeper into what analysts are forecasting on the Biogen stock forecast page.
BIIB Momentum
BIIB Earnings
Last year, BIIB earnings were $1.61B. During the last 5 year, BIIB's earnings have grown by -18.34% per year. This was slower than the Drug Manufacturers - General industry average of 11.61%.
Last year, BIIB revenue was $10.07B. During the past five year, BIIB's revenue has gone up by -6.73% per year. This was slower than the Drug Manufacturers - General industry average of 10.95%.
Dive into BIIB's earnings and revenue performance here.
Who is buying/selling BIIB?
Over the past year, executives and large shareholders at BIIB have sold more shares than they have bought.
Christopher Viehbacher, President and CEO of BIIB, was the latest BIIB insider to sell. They sold $605,163.12 worth of BIIB shares on Dec 1, 2025.
Research more about who owns BIIB shares here.
Can I get consistent income from BIIB stock?
No, Biogen doesn't provide an income stream by paying out dividends.
What do other traders have to say about BIIB?
One of the primary reasons eToro is our top-rated brokerage is because of its social trading community.
Click below to see what other investors have to say.
Step 5: Place your BIIB trade
You have two main options:
- Market order: A market order is an order to buy or sell a stock at the best price on the market.
Market orders are usually sufficient. - Limit order: A limit order enables you to buy or sell a security at a specific price (or better).
If you want to be sure you're buying or selling at an exact price, use a limit order.
Press the Open Trade button and eToro will execute the order.
If you want additional help with investing in stocks on eToro, watch the helpful video below:
Step 6: Watch your BIIB investment
Now that you own some BIIB shares, you'll want to stay up-to-date on your stock purchase.
Start a watchlist to track the most important metrics related to your BIIB stock.
BIIB Feed
How to Buy Stock in Biogen
To reiterate, here are the 6 steps you need to take to buy Biogen stock right now:
- Decide where to buy Biogen stock
- Sign up for a brokerage account
- Deposit funds into your brokerage account
- Analyze Biogen stock
- Place your BIIB trade
- Watch your BIIB investment
If you are looking for a online brokerage, eToro is our favorite venue.
Get Started with eToro TodayIf you want to watch your investment in Biogen, click the button below.
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