Client Notices

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The client notices have been distributed with all enclosures by e-mail to related Clients. For enquiry, please contact HKEX Information Services (China) Limited (“HKEX-IS (China)”) by emailing to hkex-is-china@hkex.com.hk.

Y = Applicable

Date	Ref No.	Subject	Securities Market Data	Derivatives Market Data		Issuer News	Stock Connect Market Data
Date	Ref No.	Subject	OMD-C	OMD-D	D-LITE	IIS	OMD-CC
10/03/2026	MDD/26/126_C	Update on Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for the Proposed Privatisation and Distribution of Shares of Dongfeng Motor Group Company Limited Enclosure 1 : Exchange Circular (English)		Y	Y
06/03/2026	MDD/26/103_C	Implementation of Phase 2 of Minimum Spreads Reduction in Hong Kong Securities Market - Provision of End-to-End Test Environment Enclosure 1 : Exchange Circulars (English)	Y
26/02/2026	MDD/26/101_C	Upgrade of HKEX Backbone Network for Securities Market Systems Enclosure 1 : Exchange Circular (English)	Y				Y
25/02/2026	MDD/26/097_C	Arrangement in OMD-D for Market Rehearsal and Readiness Declaration Reminder for the Implementation of 1) Compression Mechanism in DS and D-Lite (Non-SOM); 2) New Multicast Channels in SOM; and 3) Increase the Min. Bandwidth Requirement for DP and DF Enclosure 1 : OMD-D Connectivity Guide (version 1.23)		Y	Y
16/02/2026	MDD/26/088_C	Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for the Proposed Privatisation and Distribution of Shares of Dongfeng Motor Group Company Limited Enclosure 1 : Exchange Circular (English)		Y	Y
11/02/2026	MDD/26/082_C	Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for the Orion Derivatives Platform Migration - Updated Technical Documents Enclosure 1 : OMD-D Interface Specification (version 2.1) Enclosure 2 : OMD-D Developers Guide (version 2.0) Enclosure 3 : OMD-D Connectivity Guide (version 2.0) Enclosure 4 : Summary of OMD-D Changes for ODP Migration		Y	Y
10/02/2026	MDD/26/079_C	Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for Introduction of Additional Market Code for Stock Options and Stock Futures Contracts of New Underlying Enclosure 1 : OMD-D Interface Specification (version 1.48) Enclosure 2 : Exchange Circular		Y	Y
16/01/2026	MDD/26/032_C	Final Strike Information for Six New Stock Option Classes Enclosure 1 : Final Strike Info for 6 New Stock Options Classes		Y	Y
16/01/2026	MDD/26/033_C	Revision of Last Trading Day and Final Settlement Day of MSCI India (USD) Index Futures and MSCI Indonesia (USD) Index Futures Contracts Enclosure 1 : Exchange Circulars (English)		Y	Y
09/01/2026	MDD/26/006_C	Arrangement of HKEX Orion Market Data Platform - Securities Market (OMD-C) and Mainland Market Data Hub (MMDH) for Implementation of Phase 2 Minimum Spreads Reduction in the Hong Kong Securities Market Enclosure 1 : Exchange Circular (English) Enclosure 2 : OMD-C Interface Specifications (version 1.45) Enclosure 3 : OMD-C MMDH Interface Specifications (version 2.1)	Y
09/01/2026	MDD/26/011_C	Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for Introduction of Six New Stock Option Classes Enclosure 1 : Exchange Circular (English) Enclosure 2 : Vendor Access Codes Confirmation Form		Y	Y
09/01/2026	MDD/26/012_C	Update on Arrangement in HKEX Orion Market Data Platform - Derivatives Market (OMD-D) for the Proposed Privatisation of Hang Seng Bank Limited Enclosure 1 : Exchange Circulars (English)		Y	Y

OMD-C = Orion Market Data Platform - Securities Market
OMD-D = Orion Market Data Platform - Derivatives Market
D-LITE = Derivatives Lite Datafeed
IIS = Issuer Information feed Service
OMD-CC = Orion Market Data Platform - China Connect (Securities)