b"Shares of Citigroup (C) gained more than 7.5% on Tuesday, May 17, 2022 after Berkshire Hathaway (BRK/B) disclosed their nearly $3B stake in the company. Caroline Woods joins Oliver to break down the big bank's recent moves including having taken a nearly $2.6B stake in Paramount Global (PARA), shares of which gained more than 15% on the news."