Theresa May, U.K. prime minister, left, carries a document folder as she leaves 10 Downing Street to attend the weekly question-and-answer session in the Houses of Parliament, in London, U.K., on Wednesday, Feb. 22, 2017. May came under pressure to tighten takeover rules, and do so quickly, in the wake of the failed Kraft Heinz Co. bid for Unilever Plc. Photographer: Luke MacGregor/Bloomberg via Getty Images

Theresa May, U.K. prime minister, left, carries a document folder as she leaves 10 Downing Street to attend the weekly question-and-answer session in the Houses of Parliament, in London, U.K., on Wednesday, Feb. 22, 2017. May came under pressure to tighten takeover rules, and do so quickly, in the wake of the failed Kraft Heinz Co. bid for Unilever Plc. Photographer: Luke MacGregor/Bloomberg via Getty Images