Aside from artificial intelligence juggernaut Nvidia, no company garners more attention during earnings season than Berkshire Hathaway (NYSE: BRKA)(NYSE: BRKB). The trillion-dollar conglomerate that now-retired CEO Warren Buffett helped build is closely watched by value seekers and long-term investors. Continue »Warren Buffett retired as Berkshire Hathaway's CEO on Dec. 31. During the second quarter, Abel piled into the stock that Warren Buffett has consistently held nearest and dearest to his heart... Berkshire Hathaway. In aggregate, approximately $4.53 billion in Berkshire's Class A (BRKA) and Class B (BRKB) shares were bought back last quarter.