It should come as no surprise that the book is being discussed as a Hollywood prospect. Lewis is a bankable name in the industry. His books 'The Blind Side' and 'Moneyball' were turned into movies that went on to become huge hits and snag Oscar nominations. Both of those films were produced by Rudin.
Nor should it be a surprise that Lewis's non-fictional account of a trader's efforts to get to the bottom of the HFT industry is considered filmable. 'Moneyball' was also non-fiction but was easily adapted to the big screen. Of course having Brad Pitt as the lead didn't hurt.
But when it comes to the little screen -- or rather, the thousands of little screens that market participants rely on to trade the markets -- 'Flash Boys' generally has been thought of as a work of fiction.