What happened Shares of Roku (NASDAQ: ROKU) jumped Thursday morning after the company announced a long-awaited deal with AT&T (NYSE: T). As of 10:30 a.m., shares were up 7%, slightly below the all-time high hit at the market open today. So what Roku said Wednesday night that AT&T's HBO Max will launch on Roku streaming devices starting today. HBO Max launched in May, and Roku was the only remaining streaming platform not to offer it. Image source: Getty Images. Now what The timing of the agreement may not be a coincidence. While HBO Max has been available on other platforms such as Amazon's (NASDAQ: AMZN) Fire TV prior to this month, AT&T's WarnerMedia is releasing its highly anticipated Wonder Woman 1984 both in theaters and on HBO Max beginning on Christmas Day. WarnerMedia had previously announced that it will release its entire slate of 2021 movies simultaneously in theaters and for streaming on HBO Max. So a deal with Roku is crucial to maximize the potential audience for its upcoming movies. As of its third quarter, Roku had 46 million active accounts. But WarnerMedia has only activated slightly below 13 million accounts for HBO Max. Access to Roku customers will likely boost HBO Max subscriber numbers. Terms of the agreement were not disclosed. It's not surprising that one was reached, and should turn out to be a win for both companies. 10 stocks we like better than RokuWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Roku wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 John Mackey, CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool's board of directors. Howard Smith owns shares of Amazon, AT&T, and Roku. The Motley Fool owns shares of and recommends Amazon and Roku and recommends the following options: long January 2022 $1920 calls on Amazon and short January 2022 $1940 calls on Amazon. The Motley Fool has a disclosure policy.Source