To purchase Biogen stock, research and sign up for an online brokerage, deposit an initial amount into the stock brokerage, and search for the current Biogen stock price through the brokerage, notes Houston Chronicle and CNN Money. Biogen Inc trades under the ticker symbol BIIB.
Consider all factors for each online brokerage, including trade fees, account activity fees, ease of use and minimum deposit requirements. Complete the registration form to activate the account for the discount brokerage. Most online brokerages require a user name and password, explains Houston Chronicle. After signing up for the brokerage, enter the Biogen company name or stock symbol, which is BIIB, into the brokerage to find the current price, reports CNN Money. Select a buy order based on immediate market price or for a specific price.