On May 18, in response to the market disruption of May 6, the national securities exchanges and FINRA proposed rules to  pause trading in individual stocks for five minutes if the price moves 10% or more over the preceding five-minute period. Initially, the proposed rules would be in effect on a pilot basis through December 10 and would apply only to securities included in the S&P 500 Index. Comments are requested within 10 days of publication of the proposed rules in the Federal Register. FINRA. NYSE. NASDAQ. NYSE Amex LLC. BATS Exchange, Inc. Chicago Board Options Exchange. Chicago Stock Exchange. EDGA Exchange, Inc. EDGX Exchange. NASDAQ OMX BX, Inc. National Stock Exchange.