The Puzzle Pieces for a Stock Market Crash Are Taking Shape, With 4 Historically Flawless Indicators Now Sounding the Alarm

The stock market has more than doubled since the 2022 bear market, driven largely by AI infrastructure spending. However, four historically reliable indicators are now signaling potential trouble: the Shiller P/E ratio is at the second-highest level in history, margin debt has surged 77% to record highs, AI adoption may be overestimated similar to past tech bubbles, and the S&P 500 shows extreme concentration with the top 15 stocks accounting for nearly 47% of the index's value—far exceeding dot-com bubble levels.