The U.S. exchanges left out of this week's flurry of announced acquisitions now need to consider whether they, too, should strike a deal, a Chicago Board Options Exchange executive said on Friday. On Wednesday, powerhouse exchange operators Deutsche Boerse (DB1Gn.DE) and NYSE Euronext (NYX.N) said they were in advanced talks to merge, just hours after London Stock Exchange (LSE.L) unveiled a bid for Canadian market operator TMX Group Inc. (X.TO) "Every exchange that wasn't involved in the two mergers -- the four that were not involved -- had to at lunch on Wednesday be asking themselves, 'Should I be involved in some way?' and calling their bankers and thinking strategically," said Alan Dean, chief financial officer of CBOE Holdings Inc. (CBOE.O)
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