Oil prices above $110 are starting to matter to the stock market again

For the past month, investors have been living in a strange world: stocks and oil prices rising together, seemingly defying the oldest rule in macroeconomics. That paradox appears to be ending, and the consequences could reshape the market's trajectory heading into summer.

Brent crude futures remain above $110 a barrel even after slipping more than 2 percent on Tuesday, when stocks rallied on hopes of de-escalation in the Middle East. Monday told the opposite story—stocks fell as oil climbed on fears of an expanding conflict. The correlation between the two assets, the most inverted in two decades on a rolling 60-day basis, is beginning to revert to its historical pattern: oil up, stocks down.

The unusual tandem rally began around April 8, when President Trump announced a fragile ceasefire with Iran. Since then, the S&P 500 has climbed 7.2 percent while WTI crude futures jumped more than 8 percent. The stock rally had its own fuel: a blockbuster earnings season driven by AI-related companies. According to Deutsche Bank Research, AI beneficiaries grew first-quarter earnings by 50 percent year over year, up from 32 percent in the fourth quarter. That kind of growth creates its own gravity, pulling money into equities regardless of what oil does.

But the macroeconomy has a way of reasserting itself once the earnings headlines fade. "Oil prices remain elevated at uncomfortable levels, and extending the equity rally will likely depend on additional de-escalation," wrote Adam Turnquist, chief technical strategist at LPL Financial. Translation: unless geopolitical tensions ease further, the stock market is running on borrowed time.

The numbers at the consumer level are already telling a worrying story. A Barclays analysis of credit card data found that gasoline consumption has dropped 8 percent year over year on a rolling 30-day basis. That's not a rounding error—it's demand destruction. Consumers facing $4-plus per gallon gasoline are cutting back on driving, which means they're also cutting back on other spending. That's the transmission mechanism from oil prices to economic slowdown, and it's already engaged.

The scariest scenario remains a prolonged closure of the Strait of Hormuz, through which roughly 20 percent of the world's oil flows daily. Markets have been pricing in a risk premium, but if the strait were blocked for an extended period, $110 oil could look like a fond memory. The 1973 oil embargo triggered a recession. The 1990 spike during the Gulf War did the same. History doesn't repeat, but it rhymes loudly enough.

There are reasons for cautious optimism. The Iran ceasefire, however fragile, is holding. AI-driven productivity gains could offset some of the inflationary pressure from energy costs. And the Federal Reserve has shown willingness to look through supply-side inflation shocks rather than over-tightening. But the margin for error is thin. Oil at $110 is already in the zone where it starts to bite consumers and compress corporate margins. If it stays here—or climbs—the stock market's recent records will be tested.

For investors, the key variable to watch isn't earnings or Fed speeches. It's the price of a barrel of crude and the shipping lanes that deliver it. The market has spent a month pretending oil doesn't matter. That luxury is ending.

## What This Means For You

If you're an investor, it's time to stress-test your portfolio for sustained high oil prices. Energy stocks and commodities may offer a hedge, but the broader market faces headwinds if Brent stays above $110. For everyday consumers, the 8 percent drop in gasoline demand signals that household budgets are already stretched—expect discretionary spending to tighten further if pump prices don't come down. If you're considering big purchases or travel, locking in costs now before potential further price increases could save real money. And if you have exposure to sectors that depend on consumer spending—retail, restaurants, travel—watch earnings guidance carefully this quarter. Oil at this level is no longer a background variable. It's the main event.