July 13, 2026 US Market Brief | Strait of Hormuz Blockade Sends Oil Soaring 11%, Tech Takes a Hit

WTI crude oil surged 11.05% in a single day to $79.30. Trump announced the resumption of the Strait of Hormuz blockade and imposed tolls on transiting vessels, while two UAE tankers were struck by Iranian missiles in the strait—all just as the fallout from last week’s US revocation of Iran oil sales licenses was settling. Three events stacked together: tightening both supply and sentiment valves at the world’s energy choke point simultaneously.

All three major indices fell, but the gaps widened sharply. The Dow dropped a mere 0.26%, propped up by energy and financials; S&P 500 slid 0.79% to 7,515.34; Nasdaq fared worst at -1.55%, closing at 25,873.18. Sector rotation was as textbook-clear: XLE jumped 3.01%, while financials and utilities also turned green; XLK fell 2.42%, non-cyclicals dropped 1.02%, industrials down 0.85%. Capital completed its migration from tech to old economy in a single trading session.

The chip sector got an extra kick. SK Hynix stock volatility triggered chain reactions of selling, giving already spooked funds another excuse to accelerate their exit. TeraWulf bucked the trend with a 12.80% surge to $22.83; its AI computing narrative temporarily held off panic, but one WULF rally doesn’t mean the entire AI chain is safe. High-valuation, far-from-profitable names like FuelCell Energy were also hammered—markets are pruning long-duration assets regardless of any story you tell them.

The VIX jumped 14.17% in a day to 17.16. Still below 20 so no full-blown panic yet, but the speed of that spike itself is a signal. Markets have shifted their pricing model for Middle East tensions: from background noise to tail risks requiring hedging. The 10-year US Treasury yield climbed to 4.61%; oil-driven inflation expectations are already transmitting through rates.

One overlooked feature of this oil surge: it’s the risk premium that jumped. On Polymarket, odds of “Strait of Hormuz normalizing before July 15” were bet down to 0%, with $650k in 24-hour volume betting on a prolonged blockade; that 11% single-day spike reflects exactly this tail-risk pricing for the “what if it actually cuts off?” scenario. The Strait’s structural fragility lies in its near-total lack of alternatives, meaning even if no formal blockade materializes, oil risk premiums will likely stay elevated for a while. Last time markets priced geopolitical risks with similar speed was just days after Russia invaded Ukraine in 2022.

Two things to watch next: whether the blockade gets followed up by concrete actions like naval deployments or vessel interdictions; if it stays at the verbal level within two weeks, oil will likely give back most of its gains. Recent inflation data is also critical—if CPI readings are already rising, this oil shock could amplify into a secondary inflation narrative, forcing a complete reset in Fed rate-cut expectations. If that happens today’s rotation from tech to energy might evolve from a one-day trade into a multi-quarter trend.