Bats Chi-X Europe, the region's largest stock exchange, is to change a tiered pricing model it introduced in April in a move likely to further reward its most active traders, such as investment banks and high-frequency trading firms.

The London-based platform will apply a new tiered pricing scheme from January 1, 2015 for all stocks on the CXE order book, the former Chi-X Europe market that was acquired by Bats Global Markets in late 2011, according to a trading notice on Monday morning. Previously the exchange operated different tariffs for different country groupings on CXE.