Important things are 24 hours a day. Spot and forward FX, commodities, sovereign bond futures, Equity index futures, etc. See for example: http://www.cmegroup

Important things are 24 hours a day. Spot and forward FX, commodities, sovereign bond futures, Equity index futures, etc. See for example: http://www.cmegroup.com/trading_hours/ http://www.cmegroup.com/trading_hours/ CME tends to be closed for an hour a day for cleanup and that's it. US equities aren't a big deal compared to the size of bond or FX markets.