Britain’s membership of the EU had meant the region’s banks and investors could bypass the home exchanges of stocks and trade them in London over alternative venues. Those venues included Turquoise, a trading facility majority-owned by the London Stock Exchange Group PLC, and rival platforms Aquis Exchange PLC and Cboe Global Markets Inc.’s Europe-based marketplace. But with the Brexit trade agreement taking effect Jan. 1, that option ended.
“Perhaps during the course of this year that might become a little more obvious,” Ms. Foley said. “We need a longer period to really look through the overriding factors. It’s quite difficult to figure out which factors are pulling in any direction.”