Berkshire Hathaway finally invested in a company with some AI chops.Although Warren Buffett isn't the CEO of Berkshire Hathaway any longer, his final actions in that role are still being discovered by investors. Berkshire Hathaway operates a massive investment portfolio, and investors don't know how it changes until 45 days after the end of a quarter, when it files a Form 13F with the Securities and Exchange Commission (SEC). So we'll find out more about what Buffett and Berkshire did during his last few da ...