Upgrades:
Microsoft (MSFT) upgraded to Overweight from Equal-Weight at Morgan Stanley; target raised to $66 from $57
Downgrades:
American Express (AXP) downgraded to Neutral from Buy at Goldman
Other:
Twitter (TWTR) initiated with a Neutral at Mizuho; target $21
American Express (AXP) initiated with a Neutral at DA Davidson; target $70