Brent crude ripped higher again on Friday, touching $110 a barrel, its highest level since May, as reports of Iranian attacks on tankers in the Strait of Hormuz jolted an already tight market. Brent rose about 3.9 percent on the day alone, climbing from $105.79 to $109.31 between late morning and early afternoon before pushing higher into the close. The weekly gain of roughly 8 percent marks one of the sharpest oil rallies of the year and puts crude back at the center of the global inflation story, with US gasoline prices already accelerating in the September CPI report.

The proximate trigger was military, not economic. News reports said Iran had stepped up attacks on tankers in the Strait of Hormuz, the narrow waterway through which roughly a fifth of the world's oil supply moves. The sinking of a Singapore-flagged container ship by an Iranian projectile earlier in the week had already unsettled shipping markets. Each new attack raises the war-risk premium that tanker owners charge, and those costs feed directly into crude benchmarks. With the US-Iran conflict continuing and no diplomatic deal in sight, the market is pricing a non-trivial risk of supply disruption rather than just tighter balances.

The rally has a second leg in Yemen. Escalating hostilities between Saudi Arabia and Iran-backed Houthi forces added a further geopolitical bid to crude through the week. Earlier in the week, oil had briefly eased on reports of a Trump-announced energy ceasefire between Russia and Ukraine, with Ukrainian leadership still awaiting details, but that relief trade reversed violently once the Hormuz headlines took over. The episode shows how fragile the supply narrative is: ceasefire headlines can knock a few dollars off, but a single tanker attack adds them back within hours.

High oil is now the single biggest complicating factor for central banks. As one market strategist noted this week, high oil prices tend to weigh on the price-to-earnings multiples of stocks, which is why Friday's equity selloff and the oil surge arrived together. More importantly for policy, expensive energy feeds directly into headline inflation, which is exactly what pushed September US inflation above forecasts. The Federal Reserve now faces the classic 1970s-style dilemma: hike into an energy shock and risk the economy, or hold and let inflation expectations drift. That dilemma is how black-swan events break models, because no training dataset has enough true supply shocks in it. For anyone trading energy, this is a market where position sizing for volatile markets matters more than direction, because a single headline can gap the price past any stop.

The winners and losers are splitting cleanly. Energy equities were Friday's standouts, with Exxon rising 2.5 percent and Chevron adding 2.6 percent, while European and Asian markets managed to close higher despite the oil surge. The losers were long-duration growth stocks, airlines, and consumers, all of which face higher costs or lower discretionary spending. For Pakistan and other oil-importing emerging markets, $110 Brent is a direct tax on the trade balance and the currency, arriving just as the rupee had begun to stabilize.

Traders should respect the asymmetry from here. Upside risks include further Hormuz escalation, a broader US-Iran confrontation, or a coordinated supply response that never materializes. Downside risks include a genuine Russia-Ukraine energy ceasefire holding, demand destruction as high prices bite, or a strategic reserve release. The calendar is thin next week with the Fed blackout underway, which means oil headlines will move rates, currencies, and equities by themselves. In that vacuum, a single Hormuz headline can reprice crude, rates, and equities all at once, which is why energy traders are staying nimble.