Thunderful Group AB is a Swedish video game holding company based in Gothenburg and subsidiary of the Atari SA holding company. It was founded in December 2019 through a merger between Thunderful AB and Bergsala Holding's distribution business, consisting of Bergsala, Amo Toys, and Nordic Game Supply. The former Thunderful had been founded in December 2017 between Bergsala Holding, Brjánn Sigurgeirsson, and Klaus Lyngeled, incorporating Sigurgeirsson and Lyngeled's indie game studios—Image & Form and Zoink—and acquiring the publisher Rising Star Games from Bergsala Holding in July 2018. Thunderful Group has since acquired further developers, the publisher Headup Games, and the consultancy firm Robot Teddy. Atari acquired Thunderful in August 2025. Wikipedia