OREANDA-NEWS. May 20, 2015. As referenced in Equity Trader Alert #2015 - 68 and Equity Technical Update #2015 - 6, on Tuesday, June 30, 2015, a leap second will be added after 19:59:59 ET (23:59:59 UTC) in order to synchronize atomic clocks with astronomical time to keep clocks as accurate as possible.

The following Nasdaq systems will implement the early close:

  • The Nasdaq Stock Market
  • FINRA/Nasdaq Trade Reporting Facility (ACT System)
  • Nasdaq Risk Management

Please find the updated FINRA/Nasdaq TRF early close schedule for June 30, 2015 below:

End of Trade Entry:                 19:32 ET

End of Trade Action:               19:48 ET

System Unavailable:              19:55 ET

For more information on Nasdaq’s normal hours of operation, please visit the Market System Hours page.