Quote from ASusilovic:
High-speed trading in the U.S. stock market may face its biggest threat after Senator Charles Schumer proposed prohibiting so-called flash orders.
Schumer, the third-ranking Senate Democrat, urged the Securities and Exchange Commission to ban the practice in which some equity exchanges hold orders to buy and sell shares for a split second before publishing them on competing platforms. Nasdaq OMX Group Inc., Bats Global Markets and Direct Edge Holdings LLC, which handle more than two-thirds of the shares traded in the U.S., offer flash orders to their customers.