[GoPro Pre-Market Soars 86% as YouTuber Markiplier Becomes Largest Shareholder] BlockBeats reports that on September 1, according to BIT (Bit.com) market data, U.S. stock GoPro (GPRO) surged approximately 86% pre-market on Tuesday, with its stock price briefly reaching around $1.63. The news revealed that YouTube star Markiplier (real name Mark Fischbach) disclosed via a Schedule 13G filing that he holds approximately 8.5% of the company's shares, making him the largest individual shareholder. Markiplier, who has nearly 40 million subscribers and recently ventured into film production, stated that he believes GoPro's stock is undervalued and hopes to help the company return to profitability. He has previously used GoPro equipment to create content and has shown interest in the company's upcoming MISSION 1 Pro ILS interchangeable lens camera. Driven by this news, GPRO surged about 46% during regular trading hours on Monday and continued to climb in after-hours trading, with retail investors following the trend and pushing the stock price even higher. Despite this rally, GoPro's fundamentals remain under pressure, with Q2 revenue down approximately 31% year-over-year. The company is currently undergoing a strategic review, and this surge is primarily attributed to the celebrity shareholder effect.