Markets Drop Monday as Oil Surges 9% and Chip Stocks Slide

Wall Street started the week in the red on Monday, July 13, as a fresh escalation in the U.S.-Iran standoff rattled commodity markets and renewed doubts about the return on AI infrastructure spending sent semiconductor stocks sharply lower. All three major indexes closed down, with tech bearing the heaviest losses.

Indexes Fall Across the Board

The S&P 500 finished 0.79% lower at 7,515.34. The Nasdaq dropped 1.55%, losing roughly 408 points to close at 25,873.18. The Dow Jones Industrial Average declined 0.26%, or about 138 points, ending the day at 52,498.64. Technology and semiconductor stocks led the selling.

Why it matters for you: When the Nasdaq leads declines and the broader index follows, it typically signals investors pulling back from riskier positions — not just rebalancing. A broad pullback on a Monday can set the tone for the rest of the week.

Oil Spikes Nearly 9% as Iran Tensions Flare

Over the weekend, the U.S. and Iran exchanged strikes, reigniting fears about access to the Strait of Hormuz — the narrow waterway through which a significant share of the world’s oil travels. President Trump announced a blockade of the Strait and proposed a 20% fee for other nations’ ships seeking safe passage through it. Oil prices jumped roughly 9% in Monday’s session in response.

Why it matters for you: A 9% single-day move in oil is significant. Higher energy costs ripple through transportation, manufacturing, and consumer goods — putting upward pressure on prices at a time when inflation is already a focus. It also raises the stakes for Tuesday’s CPI report.

Chip and AI Stocks Under Pressure

Semiconductors were hit hard. Sandisk fell 12.6%, Marvell lost 7.8%, Intel dropped 6%, Micron slid 4.3%, and AMD gave up 4.2%. SK Hynix, the South Korean memory chip maker that surged 14% on Friday in its U.S. market debut, gave back more than half of those gains in its second session.

The underlying worry: investors are beginning to question whether the enormous scale of AI infrastructure buildout — data centers, chips, power — can realistically generate enough return on investment to justify the spending.

Why it matters for you: Chip stocks often function as a leading indicator for the broader AI trade. A sustained pullback in semiconductors can reflect a genuine reassessment of the AI growth story, not just short-term volatility. Worth watching whether Monday’s move marks the start of a wider rotation.

A Packed Week Ahead: Inflation, the Fed, and Earnings

Tuesday brings the June CPI report. Analysts expect the headline number to show a 0.2% monthly decline and a 3.8% year-over-year increase — both better than the prior reading. The caveat: those estimates were shaped when oil had pulled back from earlier highs. With crude surging again, any “soft” inflation reading may be quickly overshadowed. The Producer Price Index follows on Wednesday.

Also on Tuesday, new Federal Reserve Chair Kevin Warsh appears before the House for his first congressional testimony. He testifies before the Senate on Wednesday. Markets will be closely watching whether he maintains the hawkish stance he took at the most recent Fed meeting.

Q2 earnings season unofficially kicks off Tuesday as well, with a string of major U.S. banks reporting — among them JPMorgan, Bank of America, Wells Fargo, Goldman Sachs, and Citigroup. Strong corporate results have helped stocks weather recent headwinds, and expectations heading into the season remain high.

Why it matters for you: Three major market catalysts — inflation data, the Fed Chair’s first public testimony, and big bank earnings — all land within roughly 24 hours of each other. The combination could push markets meaningfully in either direction by midweek.

What to Watch

• Tuesday: June CPI report (headline expected: -0.2% month-over-month, +3.8% year-over-year); major bank earnings from JPMorgan, Bank of America, Wells Fargo, Goldman Sachs, and Citigroup; Fed Chair Kevin Warsh testifies before the House
• Wednesday: June PPI report; Warsh testifies before the Senate
• Ongoing: U.S.-Iran conflict developments and any updates on the Strait of Hormuz situation, which could keep oil prices volatile

Bottom Line

Monday’s losses reflected two distinct but reinforcing pressures: a geopolitical shock that sent oil soaring, and a growing skepticism about whether AI’s enormous capital requirements can deliver the returns that have been priced into chip and tech valuations. How this week’s flood of data and earnings plays out will go a long way toward determining whether Monday was a brief dip or the start of something more sustained. Keep an eye on oil and Tuesday’s CPI print — those two numbers may matter most.

This article is for general information and education only. It is not investment advice, and nothing here is a recommendation to buy or sell any security. Markets carry risk – do your own research or consult a licensed advisor before investing. MoneyPilotAI may earn affiliate commissions from tools we mention; see our affiliate disclosure.