Shares of Roku Inc. ROKU, +7.31% surged 2.6% in premarket trading Tuesday, after the streaming video player said Apple Inc.'s AAPL, +0.39% Apple TV app is available on its platform, starting Tuesday. Apple shares edged up 0.3% ahead of the open. Through the Apple TV app, Roku users will have access to their iTunes video library. Starting Nov. 1, Apple's streaming video service Apple TV+ will be available for Roku users. "Roku is a valuable partner for content providers looking to reach a large and engaged audience, and we're looking forward to bringing this new option to Roku users," said Scott Rosenberg, senior vice president of platform business. Roku's stock has run up 14.2% over the past three months through Monday, while Apple shares have climbed 14.9% and the Dow Jones Industrial Average DJIA, +0.76% has slipped 2.1%.