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Trading Alert, Technical Alert

MIAX Emerald

March 31, 2026 | 10:27 AM

MIAX Emerald Options Exchange - Updated FOI Interface Specifications to Support Upcoming Enhancements

The MIAX Emerald Exchange interface specifications have been updated to support the following enhancements.

  1. FOI Interface Specification v1.3:
    1. Market Maker on PRIME/cPRIME Contra Functionality
      1. This optional feature allows members to select Market Maker (MM) on the contra side of PRIME and cPRIME.
  2. Updates to the FOI Interface Specification are as follows:
    1. Market Maker on PRIME/cPRIME Contra Functionality
      1. Enhanced New Order Cross message to select Market Maker (MM) as a valid “CustomerOrFirm” value.
      2. Enhanced New Order Cross – Multileg message to select Market Maker (MM) as a valid “CustomerOrFirm” value.
 Additional Details:
  • These new features are pending filing with the SEC by MIAX Emerald and an activation schedule will be announced in a future alert.
  • These changes will be available in the MIAX Emerald Exchange's Firm Test Bed (FTB2) environment in May.
  • Visit MIAX Emerald Interface Specifications for additional details.
Please contact MIAX Trading Operations at TradingOperations@miaxglobal.com or (609) 897-7302 to discuss any specific issues, update configurations and to arrange interface testing.