CBOE Holdings Inc (CBOE.O) shares surged as news of two giant global exchange mergers fueled speculation that the Chicago-based U.S. options exchange would be the next takeover target. Shares in the operator of the Chicago Board Options Exchange rose as much as 12 percent, to $27.27, after London Stock Exchange (LSE.L) said it would buy Canada's TMX (X.TO), and NYSE Euronext (NYX.N) and Deutsche Boerse (DB1Gn.DE) said they were in talks to combine their businesses. (Reporting by Ann Saphir; editing by John Wallace)
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