GoPro Inc (NASDAQ:GPRO) shares are flying Monday after reports that YouTube star Markiplier has built a large stake in the camera maker. Here’s what you should know.

GoPro stock is surging to new heights today. Why are GPRO shares rallying?

YouTube Star Markiplier Becomes GoPro’s Largest Shareholder

Mark Fischbach, the internet personality who built his audience under the name Markiplier, now holds an 8.5% position in GoPro, more than anyone else who owns shares in the company, according to Bloomberg.

The report states that Fischbach described spotting the stock at its current level and thinking it looked cheap, calling the whole thing a project he’d been quietly working on because he genuinely wants to see the company turn things around.