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OneChronos European Onboarding Document Library

This page provides access to downloadable onboarding resources for the trading venues operated by OneChronos Markets UK (MIC code OCXL) and OneChronos Markets NL (MIC code OCXE), collectively known as "OneChronos Europe MTF". The documents listed are current when posted and will be replaced with version control when updated. OneChronos Markets UK Limited (Company number 15456957, FRN 1022069 - authorised by the FCA in the United Kingdom) is a wholly owned subsidiary of OCX Group Inc and OneChronos Markets NL B.V. (Chamber of Commerce number 93411073 - seeking regulatory authorisation in the Netherlands) is a wholly owned subsidiary of OneChronos Markets UK Limited.

If you have any questions or need assistance, please contact us at [email protected]

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Onboarding Documents

  • OneChronos FIX Specification v1.12
  • OneChronos EU MTF Rulebook - 2025 v.1
  • OneChronos UK & EU Subscriber Agreement v.1
  • OneChronos Reference Data & Tick Table Specification v1.1
  • OCXE_Ref Data
  • OCXE_Tick Table
  • OCXL_Ref Data
  • OCXL_Tick Table
  • OneChronos EMEA Market Data Feed Specification v1.2
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OCX Group Inc. is an independent, venture backed company that uses cutting edge technological paradigms to enable the next generation of electronic trading through its separate subsidiary entities. Contact us at [email protected].

OneChronos ® Markets LLC is a wholly-owned broker-dealer that operates a U.S. equities ATS and is a subsidiary of OCX Group Inc. Member FINRA/SIPC: www.finra.org. Check the background of OneChronos Markets LLC on FINRA’s BrokerCheck. A copy of OneChronos Markets LLC’s ATS-N is available here.

OneChronos Markets FX LLC will operate a Spot FX Platform and is a subsidiary of OCX Group Inc.

Subject to regulatory approval, OneChronos Markets UK Limited will operate a Multilateral Trading Facility to trade UK and Swiss equities, and its wholly owned subsidiary OneChronos Markets NL B.V. will operate a Multilateral Trading Facility to trade European equities.

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