Billionaire investor Warren Buffett sold 70% of his firm Berkshire Hathaway's stake in video game maker Activision Blizzard in April-June quarter before a US court approved its merger with Microsoft. Berkshire said it owned 1.9% stake worth $1.24 billion in Activision on June 30, down from 6.3% on March 31. One of Berkshire's employees had invested in Activision in 2021.