Aquis Exchange, a European equity trading platform led by industry veteran Alasdair Haynes, will attempt to boost liquidity by limiting the way high-frequency trading firms use the platform.

Aquis, launched by Haynes in November 2013, is to split its membership into two categories: those that trade on behalf of clients, such as investment banks and brokers; and those that employ proprietary trading strategies, such as high-frequency trading firms.