After-hours trading refers to the buying and selling of securities after the major U.S. stock exchanges close. The after-hours trading session can run as late as 8 p.m., though volume typically thins out much earlier in the session. Trading in the after hours is conducted through electronic communication networks (ECNs). Nasdaq provides market information on after hours trading daily from 4:15 p.m. ET to 3:30 p.m. ET on the following day .
