Worldpay sold 900 million shares of common stock at $3.71 (£2.40) on October 16, 2015. The stock began trading on the London Stock Exchange (LSE) under the symbol WPG. The sale raised $3.33 billion (£2.16 bil.). The IPO was the largest in U.K. history. Of that amount, 55.6% went to Boston-based private equity firms Advent International and Bain Capital. Worldpay was a unit of the Royal Bank of Scotland when those private equity firms paid $1.07 billion in loans and cash for it in 2010. Worldpay provides payment card acceptance services to merchants around the world. It processes about 31 ...