The Securities and Exchange Commission published rule changes that allow the New York Stock Exchange to conduct all-electronic trading.

On Monday, the first day the trading floor will be closed, the NYSE opening at 9:30 a.m. ET should happen immediately for almost all stocks, subject to certain trading bands. Existing circuit breakers that would halt trading briefly should the S&P 500 decline by 7%, 13% and 20% will continue to be in effect.

The SEC on Saturday noted the rule filings were temporary until May 15 or sooner if the trading floor reopens.