Notice to Members 2018-27

Date: July 10, 2018
Re: Supplemental Billing Carry File Name Change
Date: August 1, 2018

OneChicago, LLC (“OneChicago”) is issuing this Notice to Members (“NTM”) 2018-27 to inform market participants that OneChicago is renaming one of the supplemental billing files. Effective for the month of August, 2018, the file named “Billing Registered Tiered Carry Supplement File” will be named “Billing Reduced Carry Supplement File.” The contents of the file will not change. All billing file technical specifications can be accessed on our public FTP site at the following location:

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If you have any questions, please contact OneChicago Operations at (312) 883-4311 or