The Swiss bank joins BofA Merrill Lynch, GETCO, Goldman Sachs, Morgan Stanley, and Quantlab Group as other financial institutions that have recently bought a minority stake in the firm.

Instinet, a Nomura Group company, remains the largest equity holder in Chi-X Global through a subsidiary company.

UBS head of global equities Mike Stewart said that given their reach and position in the equity markets across the globe, it made sense to become an active participant in Chi-X Global’s model. They look forward to working with their management team in the months and years ahead.

Chi-X Global CEO Tal Cohen said that they are pleased to welcome UBS to their group of world class, distinguished equity partners. As they continue to expand their global presence through new product offerings and strategic growth opportunities, they look forward to working closely with their investors and market participants globally.

Financial terms of the transaction were not disclosed.