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US stock indexes posted strong gains on June 18, 2026, powered by a semiconductor rally and renewed optimism around a US-Iran peace deal. The Nasdaq composite led the way, climbing 1.9%, while the S&P 500 gained more than 1% and the Dow posted a more modest advance.
The real star of the session was the chip sector. The Philadelphia Semiconductor Index, the benchmark tracker for the industry, surged 6.4%. Intel shares jumped 10.6% to hit an all-time closing high.
Chips and diplomacy: the twin catalysts
Two forces converged to push equities higher. The first was a geopolitical breakthrough: the US and Iran signed an interim peace agreement extending a previous ceasefire by an additional 60 days. Lower geopolitical risk typically translates into lower oil prices, which eases inflationary pressure.
The second catalyst was domestic. President Donald Trump announced a collaboration between Apple and Intel focused on US-based chip design and manufacturing capabilities.
Intel wasn’t the only chipmaker celebrating. Nvidia shares rose 3.5% and Micron climbed 10.5% in the days surrounding the rally.
What it means for crypto
Bitcoin had traded above $65,000 in anticipation of the Iran deal, reflecting the broader risk-on sentiment that tends to benefit speculative assets when geopolitical fears recede. However, Bitcoin experienced a slight pullback on the same day equities surged, driven by lingering expectations of rate hikes.
The semiconductor trade and what investors should watch
Intel’s 10.6% surge to record highs is particularly notable given the company’s trajectory. Intel has spent years watching competitors like TSMC and Samsung dominate advanced chip fabrication. A partnership with Apple, the world’s most valuable company, represents a potential inflection point.
Nvidia, whose GPUs power both AI training and certain mining operations, continues to benefit from the semiconductor momentum. A 3.5% gain around this session reflects sustained demand for its products across multiple use cases, from data centers to blockchain infrastructure.
The 60-day ceasefire extension gives markets a window of relative calm. The Iran deal helps at the margins by reducing energy-driven inflation, which could theoretically give the Fed more room to pause or slow rate hikes. Bitcoin’s pullback from $65,000 suggests traders aren’t fully convinced the path is clear.
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