Since the establishment of NASDAQ in 1971, the regular trading period for US stocks has been maintained for a long time from 9:30 to 16:00 EST. Although pre-market and post-market trading has been open for many years, the core trading framework has not changed for more than 40 years. In December of this year, this pattern will usher in a major change — NASDAQ will officially launch the “23/5” trading system on December 6, leaving a daily closing window for only 1 hour, and continuously open trading for the remaining 23 hours.

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