Upgrades:

Downgrades:

Twitter (TWTR) downgraded to Underperform from Neutral at BofA/Merrill; target $15

Twitter (TWTR) downgraded to Neutral from Overweight at JP Morgan; target lowered to $18 from $26

Apple (AAPL) downgraded to Perform from Outperform at Oppenheimer

DuPont (DD) downgraded to Underperform from Outperform at Credit Agricole

Travelers (TRV) downgraded to Hold from Buy at Argus

Other:

Apple (AAPL) target lowered to $153 from $172 at Piper Jaffray

Apple (AAPL) target lowered to $136 from $155 at Goldman

Apple (AAPL) target lowered to $125 from $135 at Cowen

Apple (AAPL) target lowered to $117 from $130 at BMO Capital

Apple (AAPL) target lowered to 120 from $130 at RBC Capital

Apple (AAPL) target lowered to $157 from $162 at Maxim

Apple (AAPL) target lowered to $112 from $117 at Macquarie

Twitter (TWTR) target lowered to $27 from $39 at Pivotal Research Group

Twitter (TWTR) target lowered to $20 from $23 at RBC Capital