warren buffett snapped up more activision blizzard inc stock in a merger arbitrage bet as microsoft corp pursues its deal to buy the videogame maker in what would be one of the largest mergers in us history his berkshire hathaway inc now owns about 95 of the company’s stock buffett said saturday at his annual meeting in omaha nebraska that’s up from the roughly 187 stake the company held at the end of 2021 according to its latest 13f filing a portion acquired by one of buffett’s investing deputies todd combs or ted weschler