According to @CNBC, Warren Buffett’s exit leaves an open question about who currently manages Berkshire Hathaway’s approximately 300 billion equity portfolio, as no successor is identified in the headline or tweet dated December 31, 2025 (source: @CNBC on X, Dec 31, 2025). The source highlights management oversight uncertainty and provides no further detail on timing, composition, or allocation changes to the equity portfolio (source: @CNBC on X, Dec 31, 2025). The post does not reference cryptocurrencies or any direct crypto market implications (source: @CNBC on X, Dec 31, 2025).