On the upside
China Business News reported that Alibaba Group will acquire a 15% to 20% stake in Sina's (Nasdaq: SINA) Weibo microblogging site.
Wright Medical Group (Nasdaq: WMGI) will pay approximately $190 million in cash and stock to acquire BioMimetic Therapeutics (Nasdaq: BMTI).
On the downside
Global Hunter Securities downgraded DryShips (Nasdaq: DRYS) on Friday to a Neutral rating.
Jefferies downgraded Diamond Foods (Nasdaq: DMND) to an Underperform rating.
Wells Fargo downgraded K12 (NYSE: LRN) from Outperform to Market Perform.
In the broad market, advancing issues outpaced decliners by a margin of more than 10 to 1 on the NYSE and by 5 to 1 on Nasdaq. The Russell 2000 which tracks small cap stocks soared 11 points to 787.