https://www.pcgamer.com/battlefield-5-did-not-meet-eas-sales-expectations/

EA stock is facing its worst drop in more than a decade, with CEO Andrew Wilson warning that the "significant challenges" it faced during the third fiscal quarter would carry on through the fourth. This is in part due to Battlefield 5's performance, which sold a million fewer copies than EA had anticipated. 

By Tuesday, the company's stock had declined by around 18 percent. As MarketWatch notes, it's the most significant decline of the millennium for EA, and brings it close to its largest ever decline, which was on December 17, 1999. It dropped by 25.5 percent. At the time of writing, it's started to rise slightly, fluctuating between 15 to 17 percent.