Gulf Attacks Push Oil Toward $100 as Yen Surge Threatens Carry Trade Unwind

Key Takeaways

• Brent crude approached $100 a barrel after Houthi forces attacked Saudi energy facilities and cities, with diesel and gasoline prices having nearly doubled since the conflict began.
• The yen gained nearly 4% in the past week alone, its largest weekly advance since July 2024, trading around 154.4 to the dollar as Bank of Japan rate-hike expectations intensify.
• Japanese real wages rose 2.4% year-over-year in July, the largest increase since May 2021, strengthening the case for the BOJ to accelerate monetary tightening.
• Copper hit a record high of $14,694 per ton on the London Metal Exchange as supply tightened and metal continued flowing into the U.S. ahead of potential tariffs.

Houthi strikes on Saudi Arabian energy infrastructure sent Brent crude to six-week highs near $100 a barrel on Tuesday, while a rapidly strengthening yen raised the specter of a global carry trade unwind. The two shocks are compounding an already fragile equity environment rattled by surging bond yields and renewed inflation pressure.

Numbers at a Glance

Weekly Yen Gain

~4%

The yen's largest week-on-week rise since July 2024, amplifying risks for traders holding carry positions funded in the currency.

LME Copper Record

$14,694/ton

An all-time high for three-month copper on the London Metal Exchange, driven by tightening global supply and pre-tariff U.S. inflows.

U.S. 10-Year Treasury Yield

4.8%

Up 2 basis points on the day and near the highest level since November 2023, a key driver of recent equity market weakness.

Fed Rate Hike Probability

~58%

Money markets' implied probability of a Federal Reserve rate increase at next week's meeting, with Friday's inflation data seen as decisive.

Energy Shock Layered onto an Already Strained Market

Physical crude prices for immediate delivery are trading well above futures prices, a condition known as backwardation that signals acute near-term supply stress. Diesel and gasoline have each roughly doubled from pre-conflict levels, meaning the energy hit is already filtering through to consumers and freight costs—a dynamic that could sustain inflation longer than central banks would prefer.

The European Central Bank is widely expected to raise eurozone rates by a quarter point on Thursday. That backdrop pushed the STOXX 600 down 0.2% on Tuesday, while S&P 500 futures fell 0.4% and Nasdaq futures declined 0.1%, pointing to a softer open for U.S. markets after a long weekend.

Why the Yen Move May Overshadow the Oil Story

Carry trades—borrowing in low-yielding currencies like the yen to invest in higher-returning assets elsewhere—have been a significant source of global liquidity for years. As the BOJ moves toward rate hikes and Japanese bond yields approach record levels, the math on those positions deteriorates rapidly, prompting traders to sell the assets they purchased and repay yen-denominated loans.

In 2024, the last time the yen appreciated at a similar pace and carry trades reversed, global equity volatility surged sharply. ING strategist Francesco Pesole noted that even if short-term fundamentals suggest the move may be overdone, opposing it carries meaningful risk given how much carry exposure may still need to unwind. Capital Economics analysts argued that Japanese wage growth—now at its fastest pace since May 2021—makes a faster BOJ tightening path increasingly difficult to dismiss.

Friday's U.S. inflation print will be watched closely: a hot reading could lift the Fed rate-hike probability above its current 58% market-implied level and add further pressure to equities already contending with 10-year Treasury yields near multi-year highs.

InvestorStack Lens

The simultaneous pressure from oil supply disruption, yen appreciation, and rising yields in multiple major economies creates a compounding macro environment where each factor reinforces the others. Historically, rapid yen strengthening paired with carry trade reversals has produced outsized volatility—the 2024 episode cited in the source is a direct precedent. Whether the current move constitutes a full unwind or a partial correction depends heavily on how aggressively the BOJ signals further tightening, which makes upcoming central bank communications unusually important.

What Could Challenge This View

Oil prices approaching $100 could prove self-limiting: demand destruction from high energy costs may slow global growth enough to reduce inflation pressure, ultimately giving central banks room to pause rather than hike. If the Fed and BOJ signal more caution than markets currently expect, carry trade positions could stabilize, reducing the transmission risk to equities.

What to Watch Next

• Friday's U.S. inflation data and its effect on the market-implied probability of a Fed rate hike next week.
• The ECB's Thursday rate decision and any forward guidance on the pace of future increases.
• BOJ communications ahead of next week's meeting, particularly any language on the timing of further rate rises.
• Whether physical crude prices remain in backwardation versus futures, indicating sustained near-term supply stress.
• The pace of copper inflows into the U.S. and any formal tariff announcements that could alter that trade flow.