Goldman Sachs analyst says oil market already priced in Iran supply disruptions before latest sanctions

The US Treasury rolled out what it called “the toughest sanctions in history” targeting Iran on August 20, 2026. Oil prices barely flinched, and Goldman Sachs thinks it knows why.

Daan Struyven, Co-Head of Global Commodities Research at Goldman Sachs, explained during a live financial news segment that the muted price reaction stems from something simple: Iranian oil was already not reaching the market. A naval blockade of Iranian ports, reimposed around mid-July, had effectively choked off crude exports weeks before the sanctions announcement landed.

The numbers tell the story

Brent crude was trading at roughly $94 per barrel on August 21, while WTI sat at about $87. Both benchmarks had climbed 5-6% over the prior week, a meaningful but hardly explosive move given the geopolitical intensity of the moment.

That weekly gain, Struyven suggested, reflects the physical reality of supply constraints rather than the political theater of sanctions rhetoric. Officials have described Iranian crude flows as “virtually stopped” under the blockade, which means the sanctions are essentially formalizing a disruption that tankers and port authorities had already made real.

Adding another layer of tightness, a temporary authorization known as General License X, which had permitted limited Iranian oil sales, expired on August 21. That expiration effectively closed one of the last remaining legal windows for Iranian crude to find buyers.

Why the market shrugged

Struyven’s core argument is straightforward: markets price in supply, not speeches. When actual barrels stop moving, traders adjust. When politicians announce that they plan to make barrels stop moving, traders check whether the barrels were already stopped. In this case, they largely were.

US sanctions on Iranian oil stretch back to the aftermath of the 1979 revolution, and every administration since has taken its own approach to squeezing Tehran’s petroleum revenue.

Iranian crude offers to Chinese buyers, historically the largest remaining market for sanctioned Iranian barrels, had already declined sharply amid the escalating tensions and sanctions rhetoric leading up to the formal announcement.

What traders are actually watching

For anyone positioned in energy markets, Struyven’s framing carries a useful implication. The variable that matters most right now is not the text of sanctions documents. It’s the effectiveness of the naval blockade and whether enforcement remains consistent.

China has been the primary destination for Iranian crude that slips through sanctions regimes, often via ship-to-ship transfers and creative documentation. The sharp decline in Iranian offers to Chinese buyers suggests that even these workaround channels are contracting.

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