Warren Buffett's historic $127 billion warning to Wall Street happens to align with another stock market alarm. Specifically, the S&P 500 currently trades at a historically expensive valuation. The index achieved a cyclically adjusted price-to-earnings ratio (CAPE) of 37.9 in December 2024, which is a substantial premium to 20-year average of 27.

U.S. stocks are drifting near a record as Wall Street’s recent rally loses some momentum. The S&P 500 slipped 0.1% in early trading Thursday, a day after after pulling to the edge of its all-time high set in early December.

Shares were mixed in thin Asian trading on Monday after U.S. stocks edged back from their all-time high. Oil prices fell and U.S. futures sank, while Chinese shares shed some of their early gains after a survey of manufacturers showed export orders dropping to a five-month low.