The shares currently stand at around US$29.59.
The heavyweight broker's rating on the stock was also moved to 'underweight' from 'equalweight'.
Also on the downgrade front, mining titan BHP Billiton (NYSE:BBL) was pushed down to 'neutral' from 'buy' by US broker Citigroup.
Elsewhere, JP Morgan applied the brakes to motorcycle specialist Harley Davidson (NYSE:HOG), downgrading it to 'neutral' from 'overweight'.
BofA Merrill Lynch had a look at household ratailer Dollar General (NYSE: DG) today, lifting it to 'neutral' from 'underperform'.