Dear Participants,

This is part of a series of communications highlighting key integration dates and materials surrounding the upcoming platform migration of the Chi-X Europe order books onto BATS Europe technology. The purpose of this communication is to provide details on the updated Technical Specifications, Testing Guide and Connectivity Guide for the migration.

The revised Connectivity Pricing is also linked below. It includes separate pricing for Trading Participants and Non-Trading Participants and will be effective 1st May 2012 unless otherwise stated.

Connectivity Information, Technical Specifications & Testing Guides

Technical Integration webpage: www.batstrading.co.uk/integration/technical/

* Connectivity

o Migration Guide: www.batstrading.co.uk/resources/participant_resources/BATS_Connectivity_Manual_Integration_Supplement.pdf

o Connectivity Pricing: www.batstrading.co.uk/resources/participant_resources/BATSEuro_ConnPricing.pdf

* Technical Specifications

o Market Data Migration Guide: www.batstrading.co.uk/resources/participant_resources/BATS_Europe_ChiX_Market_Data_Migration_Guide.pdf

o Chi-X Europe FIX Compatibility mode Guide: www.batstrading.co.uk/resources/participant_resources/BATS_Europe_ChiX_FIX_Compatibility_Mode_Guide.pdf

o Testing Guide: www.batstrading.co.uk/resources/participant_resources/TestingGuide.pdf

* Technical Contacts for the migration

Connectivity: NOCeurope@batstrading.com+44.207.012.8905
Application or Trading Queries: TradeDeskEurope@batstrading.com +44.207.012.8901

Please continue to contact the Chi-X Europe Operations team with any technical questions regarding daily service and support on the existing Chi-X Europe trading platform.

The latest migration information and documents are available at www.batstrading.co.uk/integration, which will be updated regularly throughout the transition.

Please contact the BATS Europe Trade Desk or your Account Manager if you have any questions.