I have no idea whether BIIB will rise or fall from here, but I expect it to form a rising wedge after its stellar earnings report and guidance upgrade, with volatility between the red trend lines. Not all the press around BIIB's earnings is positive, so there is some cause to think it may fall before it rises. My green line indicates the sell zone. Get out when it rises above this line, and get back in if it breaks out above the triangle on volume.
