Take a look at some of Friday's midday movers:
Abengoa Yield - The owner of renewable and conventional power and electric transmission assets soared in its market debut after 24.9 million shares were priced at $29 a share.
Aeropostale - The retailer and others including Abercrombie & Fitch, American Eagle Outfitters and Zumiez gained after Sycamore Partners announced a a 9.9% stake in Express, saying it could be interested in buying the retailer.
Alcoa - The aluminum producer rose after BMO Capital upgraded the stock to market perform from under perform.
Blackberry - The wireless device maker declined on bearish comments from Credit Suisse.
Citigroup - The lender fell after Bloomberg reported the government has asked the lender to pay more than $10 billion to settle an investigation into its sale of mortgage securities ahead of the financial crisis.
Lululemon Athletica - The Canadian yogawear retailer fell to a three-year low after it received five more downgrades.
OncoMed Pharmaceuticals - The drug developer fell after it halted early stage trials in two of its experimental cancer drugs, due to concerns of bone damage.
Sprint - The telecommunications carrier rose and T-Mobile US fell. CNBC's David Faber reported a definitive deal is still weeks away, that the merged company would be branded T-Mobile, and the two agreed on a $2 billion breakup fee.
Yelp - The online local guide rallied as did other Internet names including Groupon, Angie's List and GrubHub rose after Priceline Group said it would as buy OpenTable for $103 a share in cash, a 46 percent premium over OpenTable's Thursday close.
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—By CNBC's Rich Fisherman.
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