Twitter and become a fan on Facebook.
Here are Thursday's top research calls, including an upgrade for Western Digital and downgrades for Quintiles and Royal Caribbean.
Strong demand drives results and gains for Boeing, Akamai and others.
But several airline and retail stocks are proving highly volatile.
Under Armour's (UA) stock rating was lowered to 'market perform' at Cowen after the company posted a slump in gross margin and issued downbeat guidance for 2017 and 2018.