The US stock market tacked on roughly $1 trillion in market capitalization right at the open, a staggering single-session jolt driven by growing optimism around a potential US-Iran peace agreement.
What’s driving the rally
The S&P 500 has surpassed $65 trillion in total market capitalization as of mid-June 2026, a milestone that reflects not just this single-day pop but a broader bull run fueled by artificial intelligence enthusiasm and robust IPO activity. Both the S&P 500 and Nasdaq have recently touched new all-time highs, propelled by the market’s appetite for AI-adjacent stocks.
The semiconductor rollercoaster
Micron Technology has been a standout performer, with its stock surging approximately 19% to push its market capitalization past the $1 trillion threshold. That jump came after UBS raised its price target on the chipmaker in late May 2026.
