Escalating geopolitical tensions following the joint U.S.-Israel operation against Iran could materially tighten oil markets, Bernstein analysts warn, with the key swing factor being any disruption to flows through the Strait of Hormuz.

The analysts, led by Irene Himona, expect the conflict to “immediately add a $5-$10/bbl risk premium to oil prices,” reflecting the threat of a major supply shock from the effective closure of the Strait of Hormuz by Iran. With roughly 20% of global oil and liquified natural gas (LNG) trade moving through the chokepoint, the duration of any disruption becomes vital.

Bernstein models three war scenarios based on a full Strait closure lasting one, three, or six months.

Under a limited disruption of one to three months, the broker’s prior expectation of a 2.8 million barrels per day (mb/d) surplus in 2026 would flip to an average deficit of about 1.8 mb/d, implying roughly $80 per barrel Brent versus its $65 base case, whilst European gas benchmark TTF would rise from $10 to $15 million British thermal units (mmBTU).

In its most severe case, a six-month closure would produce “by far the worst” outcome, the analysts stressed, with an implied 5.6 mb/d deficit and Brent rising above $110 per barrel, a level the analysts say approaches recessionary territory.

“With OPEC’s spare capacity at around 3.0mbd, the 6-month closure scenario would have potentially grave consequences for the world economy,” they wrote.

Even the physical logistics highlight the risk. Pipeline routes from Saudi Arabia and the UAE could bypass only a fraction of Hormuz volumes, with spare capacity of less than 3 mb/d covering roughly 15% of flows through the strait.

Using a mid-case $80 Brent assumption, Bernstein estimates discounted cash flow (DCF) valuations would rise about 10–11% for the large European integrated oil companies, while more upstream-focused names could see larger upgrades.

However, the analysts warn that major oil companies also face “high-consequence” volume exposure to the Middle East, meaning higher prices would not fully translate into earnings gains if regional production were disrupted.
Source: Investing.com