Two geopolitical dominoes fell at roughly the same time, and chip stocks were the primary beneficiary. The Philadelphia Semiconductor Index, better known as the SOX, blew past the 14,000 mark on June 15 for the first time in its history, capping a rally that added roughly $1.15 trillion to the US stock market in a single session.
The catalysts: growing optimism around a potential US-Iran interim agreement, and oil prices dropping to three-month lows.
What drove the rally
Earlier in the month, escalating tensions in the Middle East had triggered sharp sell-offs across the semiconductor sector. Then the Trump administration signaled diplomatic progress on Iran. The prospect of an interim deal, or at minimum a ceasefire framework, was enough to flip market sentiment almost overnight. Oil prices retreated to levels not seen in three months, easing inflation fears and removing one of the biggest overhangs on risk assets.
Micron and AMD emerged as standout gainers during the session, benefiting from both the geopolitical relief and persistent enthusiasm around artificial intelligence spending. Nvidia also contributed meaningfully to the rally, given its dominance in data-center GPU sales.
