US broker round-up

AMAZON.COM: Bank of America Merrill Lynch downgrades to neutral from buy.CSX: Jefferies & Co reiterates underweight, price target of $28 (vs. $29).GAP: Caris & Company upgrades to overweight from hold, price target of $32 (vs. $27).GENERAL MOTORS: Morgan Stanley reiterates coverage at overweight, price target of $45.GOLDMAN SACHS: Citigroup reiterates buy, price target of $145 (vs. $135).GROUPON: Stifel Nicolaus downgrades to sell from hold.JP MORGAN CHASE: Citigroup reiterates buy, price target of $52 (vs. $45).KOHLS CORP: JP Morgan upgrades to neutral from underweight, price target of $55 (vs. $42).PFIZER: Citigroup reiterates neutral, price target of $23 (vs. $19).RALPH LAUREN: Deutsche Bank Securities reiterates overweight, price target of $200 (vs. $190).C.S.