Nasdaq Inc. on Friday announced the most ambitious plan yet by a major U.S. exchange operator to allow stocks to be traded around the clock.

Nasdaq Inc. announced on March 7 that it's seeking permission from regulators to expand trading hours on the biggest stock exchange, the Nasdaq Stock Market. The exchange wants to launch 24-hour trading Monday through Friday.

President Tal Cohen is proposing a 24-hour, five-days-a-week schedule, which would represent a seismic shift for the platform. Trading could soon be very different on the Nasdaq stock market if the stock exchange gets its way.