S&P 500 logs rare four-day streak, volatility follows

The S&P 500 just staged a rare four-day winning streak, surging 5% by August 4. It was only the third such run in the past 30 years. The last times this happened—in 1999, 2000, and 2020—markets soon turned volatile. Investors are watching closely to see if history repeats.

The market has defied gravity for more than two years despite inflation, geopolitical tensions, and rising interest rates. AI remains the main engine, driving spending by tech giants that could top $700 billion this year alone. Yet cracks are showing. Some big tech firms are seeing cash flow weaken while smaller AI infrastructure players surge on supply constraints. Recent strong earnings from Microsoft, Amazon, and Palantir helped spark the latest rebound.

The pattern is familiar but unsettling. In 1999 and 2000, similar streaks ended badly during the dot-com crash. In 2020, the market kept rising—only to crash in 2022 after pandemic stimulus faded. This time, the AI boom looks different but also concentrated. If growth stalls, the fallout could be sharp.

What happens next matters beyond Wall Street. A market pause could slow business investment, hurt consumer confidence, and reshape AI spending plans. Analysts say the next move depends on whether profits catch up to valuations—or if sentiment turns again. One thing is clear: rare streaks like this rarely last.