Some of the region's largest hedge-fund firms have resulted from spinoffs from global managers.
Advisors Asset Management CEO Scott Colyer says loosening regulatory reigns may free up spending previously directed toward compliance.
With investors increasingly moving to lower-cost, passively run funds, the firm says it plans on countering the resulting record redemptions by merging with Henderson Group.
Massachusetts Mutual Life Insurance, Pacific Life Insurance and TIAA are among companies that have been pursuing deals to diversify operations and gain market share from publicly traded rivals.
Bats handles about a quarter of ETF trading volume in the U.S., giving CBOE a significant beachhead.