Rival bidders for CBOT Holdings
Chicago Mercantile Exchange Holdings
Atlanta-based energy exchange IntercontinentalExchange , which has been pursuing a hostile bid for CBOT since March, is also considering whether to raise its offer a third time, Bloomberg said.
Each bidder has already raised its offer twice for the parent of the Chicago Board of Trade.
CBOT members and shareholders and CME shareholders will vote on July 9 on whether to approve their merger, which was cleared last week by the U.S. Department of Justice.
None of the three companies was immediately available to comment.