The Nasdaq is set to launch 23-hour, five-day-a-week trading for U.S. stocks and ETFs, marking a significant shift in how global investors access American markets. The second-largest stock exchange in the world, with a total market capitalization of $41.23 trillion, plans to file paperwork with the Securities and Exchange Commission to extend trading hours and meet increasing demand for nonstop equity trading. The new plan would expand Nasdaq's trading schedule from 16 to 23 hours per weekday, consolidating activity into two longer sessions to streamline access for international traders. The move comes amid growing momentum for 24-hour trading, with the first such stock exchange approved a year ago.