ACADIA Pharmaceuticals Inc

Check out the companies making headlines before the bell:American Airlines (AAL) – Chief Executive Officer Doug Parker announced he would step down from that job on March 31 and remain as chairman. He'll be replaced as CEO by current…

Apple signage on the Apple campus in Cupertino, California.David Paul Morris | Bloomberg | Getty ImagesCheck out the companies making headlines in midday trading.Apple — The tech giant saw its shares jump 3.5% after Morgan Stanley's Katy…