Trading Hours



Trading Hours

The electronic marketplace is open Monday through Friday.

SSF Markets
O: 08:30 AM CT
C: 03:00 PM CT

SSF Spread Markets
O: 08:30 AM CT
C: 04:00 PM CT

Block and EFP Trade Reporting
O: 07:00 AM CT
C: 04:00 PM CT

Half-day Trading Hours

Markets close early on the following days: July 3 2019, Nov 29 2019, Dec 24 2019, Nov 27 2020, Dec 24 2020, Nov 26 2021.

SSF Markets
O: 08:30 AM CT
C: 12:00 PM CT

SSF Spread Markets
O: 08:30 AM CT
C: 01:00 PM CT

Block and EFP Trade Reporting
O: 07:00 AM CT
C: 01:00 PM CT

User Acceptance Testing

Please contact the Trading Operations Desk for scheduled testing requests.

Connectivity Hours
Excluding scheduled maintenance windows and exchange holidays, User Acceptance Testing environments are available Monday through Friday between:

O: 03:00 AM CT
C: 09:00 PM CT

Exchange Holidays

All OneChicago markets are closed on the US holidays as listed below:

2019 2020 2021
New Year’s Day Tuesday Jan 01 Wednesday Jan 01 Friday Jan 01
Martin Luther King, Jr Day Monday Jan 21 Monday Jan 20 Monday Jan 18
President’s Day Monday Feb 18 Monday Feb 17 Monday Feb 15
Good Friday Friday Apr 19 Friday Apr 10 Friday Apr 02
Memorial Day Monday May 27 Monday May 25 Monday May 31
Independence Day Thursday Jul 04 (OBS) Friday Jul 03 (OBS) Monday Jul 05
Labor Day Monday Sep 02 Monday Sep 07 Monday Sep 06
Thanksgiving Day Thursday Nov 28 Thursday Nov 26 Thursday Nov 25
Christmas Wednesday Dec 25 Friday Dec 25 (OBS) Friday Dec 24