Upgrades:
Downgrades:
Exxon Mobil (XOM) downgraded to Hold from Buy at Argus
Alcoa (AA) downgraded from Overweight to Neutral at JP Morgan, target lowered from $20 to $18.50
Other:
Apple (AAPL) target raised to $145 from $135 at Canaccord Genuit
Twitter (TWTR) target raised to $50 from $45 at Wunderlich
Freeport-McMoRan (FCX) target lowered from $42 to $25 at Argus