Upgrades:
Merck (MRK) upgraded to Buy from Neutral at Guggenheim
Merck (MRK) upgraded to Overweight from Neutral at Piper Jaffray
Merck (MRK) upgraded to Overweight from Equal-Weight at Morgan Stanley
Downgrades:
Walt Disney (DIS) downgraded to Sell form Hold at Pivotal Research
Twitter (TWTR) downgraded to Hold from Buy at Pivotal Research
Other:
Boeing (BA) initiated with an Underperform at RBC Capital Mkts; target $136
United Tech (UTX) initiated with a Sector Perform at RBC Capital Mkts