Brent's 3.7% climb to $103.91 on Iran war risk drags European stocks lower

A 3.7% gain that finishes at $103.91 started from about $100.20 ^[21]. Brent added roughly $3.70 a barrel by mid-morning. Earlier in the week crude had been falling on signs that Middle East exports were heading back toward pre-war levels and that G7 nations had agreed to tap their stockpiles ^[6].

The split between the benchmarks, or rather the gap between their gains, says more about where the risk sits. The barrels lost to the hurricane were American. Even so, Brent's 3.7% outran the gain in West Texas Intermediate, which was a little more than 3.45%, to above $91.41 ^[3]. That left the international grade about $12.50 above the US one ^[24]. If weather had set Thursday's price, I'd expect WTI to lead. It trailed. The premium landed on Brent, the benchmark Euronews describes as international ^[1] and the one that prices seaborne supply exposed to Hormuz.

Oil reaches equity prices mostly through rates. The Fed's quarter-point hike in September, its first since July 2023, left the policy range at 3.75% to 4% ^[10]. The 10-year Treasury sits 1.32 points above the top of that range ^[22], so companies borrowing long already pay well over what the Fed charges overnight. Euronews noted that higher borrowing costs can weigh on profits and make bonds more attractive to investors ^[11]. Samsung estimated third-quarter operating profit of 107.4 trillion won, up 782.5% ^[12], or nearly nine times the year-earlier figure of about 12.2 trillion won ^[23]. Its shares fell ^[12].

The US and Iran have yet to reach a deal to end their war ^[18]. So far the supply response falls to the International Energy Agency, whose members on Wednesday backed accelerating stock releases already pledged in March, prioritising diesel where possible ^[16]. That brings forward barrels already promised. It adds no new pledge.

A quick restart by Gulf of Mexico producers after Isaias would take the hurricane share out of the price. Should Middle East exports resume the recovery that pushed crude lower earlier this week, the March releases would go further. Strikes of the kind The Atlantic described, arriving after the 3 November vote with tankers still under attack, would make both of those matter less.

I think the Hormuz premium outlasts the hurricane, so equity prices carry this inflation risk at least until the Fed's year-end decision. The counter-case is this week's own record: exports were normalising and crude was falling until a run of bad news, including data showing Tehran had stepped up tanker attacks, reversed it within days ^[4]. If Brent drops back under $100 while those attacks continue, weather drove Thursday's move. If the 10-year yield falls while oil holds above $100, equities have less to fear from the rate channel than Europe's open implied.