BIIB is approaching our first resistance at 358.10 (horizontal swing high resistance, 61.8% Fibonacci extension, 78.6% Fibonacci retracement) where price might drop to our first support at 310.07 (61.8% Fibonacci retracement, 61.8% Fibonacci extension).
Stochastic (89,5,3) is approaching resistance where we might see a corresponding drop in price.