But wait, there's more! While regular trading hours still exist, today's modern way of trading has created a new set of extended hours and after-hours trading. In 1991, the NYSE launched extended-hours trading from 4 p.m. to 5:15 p.m. Extended-hours trading was initially limited to institutional investors, but electronic trading eventually extended access to retail investors as well.
Today, the NYSE extended trading hours begin at 4 a.m. and end at 8 p.m. EST, allowing investors up to 16 hours of extended trading each day.
Peter Asch, corporate communications and archivist for NYSE, told Benzinga newswire that a number of influences from volume, number of securities, clearing requirements, paperwork and the role of technology have all played a part in creating today's hours.