纳斯达克申请将股票交易时长从16小时延长至23小时，计划2026年下半年推出

Group 1 - Nasdaq has officially submitted an application to the SEC to extend stock trading hours significantly, moving from the current 16 hours over five trading days to 23 hours [1] - The new "23/5" trading model aims to better serve global investors' trading needs, with daytime trading starting at 4 AM and ending at 8 PM, followed by a one-hour maintenance period, and night trading from 9 PM to 4 AM [1] - The implementation of extended trading hours is contingent upon technological upgrades to the securities information processor, which is responsible for displaying accurate stock quotes [2] Group 2 - The initiative reflects the increasing globalization of markets, as international investors seek to participate in U.S. stock trading according to their local time [2] - Nasdaq plans to launch the extended trading service in the second half of 2026, aligning with similar plans from other exchanges like the NYSE and CBOE [1]