Nasdaq agreed to sell its U.S. fixed-income electronic trading platform to an affiliate of Tradeweb Markets.
Former SEC Commissioner Kara Stein joined the board independent stock exchange IEX Group.
Major exchanges have asked a federal court to stop the SEC's transaction fee pilot program.
A new kind of long-term stock exchange initially approved by federal regulators now faces a less certain fate.
The SEC's first high-profile rejection of some Nasdaq and NYSE fee increases could lead to more oversight of market fees and practices.
The Commodity Futures Trading Commission is working on more market-based rules for swaps executions, Chairman J. Christopher Giancarlo said.