1. Berkshire Hathaway has sold U.S. stocks for 12 consecutive quarters. 2. Buffett's cash reserves total $381 billion, raising concerns of overvaluation. 3. U.S. stock markets lag behind global markets in performance this year. 4. Current valuations suggest caution, reminiscent of past market downturns. 5. Buffett's historical performance indicates long-term prudence in investment strategy.