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The Securities and Exchange Commission has approved Chicago Stock Exchange Inc.'s plan to slow down trading for some market participants.
The 350-microsecond delay was first proposed by Chicago Stock Exchange in August 2016, but after various changes to the proposal, the company is set to become the third to operate a national exchange with a speed bump, joining Intercontinental Exchange Inc. and IEX Services LLC.
The speed bump would allow the exchange to combat declining trading...