S&P 500 set to snap 9-day win streak as stocks fall on geopolitical fears

The S&P 500’s longest winning streak since May 2025 ran headfirst into reality on June 3, 2026. After nine consecutive sessions of gains, including a record close above 7,600 just the day before, US equities took a sharp turn lower as geopolitical tensions involving Iran sent investors scrambling for the exits.

The Dow Jones Industrial Average fell between 425 and 450 points intraday, while the Nasdaq Composite also declined in what amounted to a broad, unforgiving risk-off session.

What triggered the sell-off

The proximate cause was escalating Iran-related geopolitical tensions. The S&P 500 had closed above 7,600 for the first time ever on June 2, 2026, riding a wave of enthusiasm around AI and semiconductor stocks. Markets had been pricing in strong corporate earnings, cooling inflation, and an AI boom.

The sell-off was broad-based rather than concentrated in any single sector. When the Dow drops 450 points and the Nasdaq falls in sympathy, it typically signals genuine risk aversion rather than sector rotation.

Context matters: how big was the streak

Nine consecutive winning sessions is rare enough to merit attention. The last time the S&P 500 strung together a streak of that length was May 2025. It was fueled by mega-cap tech strength, AI-related enthusiasm in semiconductors, and a cooperative macro backdrop.

What this means for investors

Upcoming economic data adds another variable. ADP employment figures and ISM services PMI data are both on deck, and either report has the potential to shift sentiment further.

The semiconductor and AI names that powered the S&P 500 to record territory are also the stocks most vulnerable to a sentiment reversal. These are high-beta, high-expectation trades that tend to fall harder than the broader index when market mood shifts.

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