Upgrades:

Apple (AAPL) upgraded to Outperform from Mkt Perform at Raymond James

Downgrades:

Twitter (TWTR) downgraded to Hold from Buy at Cantor Fitzgerald

Twitter (TWTR) downgraded to Hold from Buy at Canaccord Genuity

Twitter (TWTR) downgraded to Hold at Axiom Capital; target lowered to $16

Other:

Apple (AAPL) reiterated with a Buy Mizuho; target $120

Apple (AAPL) target raised to $115 at Macquarie

Verizon (VZ) target raised to $57 from $54 at FBR Capital

Twitter (TWTR) target lowered to $14 at Wedbush

Twitter (TWTR) target lowered to $17 from $20 at RBC Capital Mkts

Twitter (TWTR) reiterated with a Sell at Stifel; target lowered to to $9

Caterpillar (CAT) target raised to $73 at RBC Capital Mkts