The US stock market tacked on roughly $1.15 trillion in market value in a single trading session. The rally was broad but not random: AI-adjacent stocks and semiconductor names did most of the heavy lifting, while positive signals on the US-Iran front gave investors permission to buy aggressively.

The Nasdaq climbed approximately 2.4% on the day, with the S&P 500 gaining about 1.8%. Both indices pushed to record highs, extending a run that has seen the S&P 500 add trillions in total market cap since its March 2026 lows.

What drove the surge

Two forces converged. First, the AI trade that has defined markets for the past two years showed no signs of fatigue. Semiconductor stocks continued pulling capital from virtually every other sector. Second, geopolitical optimism gave risk appetite a jolt, with investor sentiment lifting after statements from former President Trump regarding Iran.

Throughout 2026, markets have experienced single-session swings ranging from $650 billion to $1.7 trillion across the S&P 500.

The AI machine keeps printing

Micron Technology’s market capitalization crossed the $1 trillion threshold in late May 2026, driven by surging demand for AI memory solutions and a wave of favorable analyst upgrades. Since the March 2026 lows, the S&P 500’s recovery has been propelled primarily by strong AI and tech earnings combined with easing geopolitical tensions.

The anticipated SpaceX IPO, with a projected valuation around $1.8 trillion, has become a focal point for sector rotation strategies. Investors are already positioning portfolios in anticipation of what would be the largest public offering in history, and the gravitational pull of that event is influencing capital flows across both tech and non-tech stocks.

What this means for crypto investors

Bitcoin was trading near $63,500 on the day of the rally, up approximately 2.5% over the prior 24 hours. Equities have generally outperformed digital assets during recent rallies.

For traders watching the interplay between equities and crypto, the key variable to monitor is whether major events like the SpaceX IPO trigger sector rotations that pull capital away from digital assets, or whether the rising tide of risk appetite lifts all boats.