Social media titan Twitter (NYSE:TWTR) was sent a downgrade by broker Morgan Stanley today, which pushed the target price on the shares down to US$24 from the US$36.
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'.
On the upgrade front, Canadian Oil Sands (TSE:COS) was lifted to 'equalweight from 'underweight' by analysts at Barclays bank, and the target price punted up to US$10 from US$6.
ASOS (NYSE:ASOMF), the online fashion retailer, was lifted to 'hold' from 'sell' by Investec.
BofA Merrill Lynch had a look at household ratailer Dollar General (NYSE: DG) today, lifting it to 'neutral' from 'underperform'.