The S&P 500's roller-coaster has left investors dizzy. A sharp 3.4% rebound after an even deeper drop marked the biggest move since the White House suspended radical additional tariffs in April 2025. Markets have been parsing the causes: was it the Middle East escalation? Inflation fears? Fed rate worries? Or all of the above?

S&P 500 volatility dynamics

In reality, the root cause is capital rotation. Investors are locking in profits after the blistering rally in chip stocks and reallocating into other assets — chief among them cash set aside for the imminent SpaceX IPO. That float risks becoming the largest in history.

In early June, the Philadelphia Semiconductor Index was up about 96% since January. Baird Private Wealth Management estimates that profit-taking will trim that advance to about 80%. Once chatter about stretched bubbles starts circulating, investors dump names with overstretched fundamentals: anything with a forward P/E above 30 becomes a selling candidate.

Portfolio diversification is not limited to tech. The consumer sector sits in the crosshairs — it would suffer most if inflation remains elevated and the Fed tightens policy — and investors are instead buying equities that pay high dividends.

It is unlikely the S&P 500's slide was driven primarily by events in the Middle East. There has been an escalation — Iran shot down a US helicopter, the US responded with strikes on 20 targets, and Tehran retaliated against other regional states. Iran says US forces must leave the Middle East to ensure its security.

Yet oil did not rally on the escalation. Brent continued the post-truce decline. The market may have adapted to a closed Strait of Hormuz. If so, that would free US President Donald Trump to pursue an aggressive campaign against Tehran without fearing a spike in oil and a jump in US inflation.

Equities continue to live in a world of high earnings and a resilient economy. That said, rising risks of interest rate hikes by the Fed are dampening bulls' bravado on the broad index.

Technically, the S&P 500 is retracing toward its uptrend on the daily chart. This allowed traders to open long positions at 7,300, which can be increased on moves above 7,540 and 7,480.