According to @KobeissiLetter, Berkshire Hathaway disclosed a $5 billion stake in UnitedHealth (UNH) after spending two quarters accumulating the position, source: @KobeissiLetter. According to @KobeissiLetter, the update identifies UnitedHealth as the previously reported mystery stock and describes it as the largest U.S. insurance company, source: @KobeissiLetter. According to @KobeissiLetter, the post does not mention cryptocurrencies or digital assets, indicating no direct BTC or ETH market implications are signaled by the source, source: @KobeissiLetter.