$9M shares bought by insider last Friday. Wave 3 Target of $403 matches Bull Flag Target.
Today, BIIB price target was raised from $317 to $321 and announced partnership with another company to develop a new drug. The stock broke out. BB bands coiled and ready to snap and push stock price up on wave 3. Oscillators are closer to the oversold region and has lots of room to go up before being overbought.