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U.S. stocks were flat on Friday on worries that a potential deal by major oil producers to freeze output would do little to tackle a stubborn global oversupply. The Dow Jones industrial average was down 0.01 percent at 17,925.08, the S&P 500 was down 0.05 percent at 2,081.84 and the Nasdaq Composite was down 0.06 percent at 4,942.982.
** BATS GLOBAL MARKETS INC, $22.99, +21.00 pct
BATS shares rose as much as 20.5 percent in their debut on the company's own exchange on Friday - redemption after a botched attempt to go public in 2012.
** POLYCOM INC, $12.04, -1.87 pct
** MITEL NETWORKS CORP, $7.09, -10.03 pct
Mitel said it would buy fellow voice and telephony gear maker Polycom Inc for about $1.96 billion in cash and stock, satisfying a demand from hedge fund Elliott Management.
** SUNEDISON INC, $0.3871, -33.84 pct
The solar energy company said it was in talks for potential debtor-in-possession financing with some of its first- and second-lien lenders.
** CITIGROUP INC, $45.57, +1.31 pct
The bank's quarterly profit plunged 27 percent as it earned less from trading and investment banking and incurred higher costs related to shrinking some of its businesses, but lower operating costs helped it beat Wall Street's tempered profit and revenue expectations.
** VALEANT PHARMACEUTICALS INTERNATIONAL INC, $32.26, -0.31 pct
The Canadian drug maker has brought in investment banks to review its options amid interest from buyout firms and other companies in a number of its businesses, according to people familiar with the matter.
** GREAT BASIN SCIENTIFIC INC, $4.852, +77.73 pct
The molecular diagnostics company reported a 60 percent jump in first-quarter revenue as it added new customers.
** AUTOHOME INC, $30.8, +2.12 pct
Autohome, a Chinese automobile information website operator, said insurer Ping An Insurance Group Co will buy 47.7 pct stake in the company from Australian telecoms company Telstra Corp for $1.6 bln.
** ENSCO PLC,, $9.75, -7.93 pct
The UK-based offshore driller's upsized offering was priced at a 12.7 pct discount to the stock's Thursday close. (Reporting by Vishaka George in Bengaluru; Editing by Anil D'Silva)