Iran’s crude oil exports in September 2025 surged to levels unseen since mid-2018, reaching more than 1.9 million barrels per day, according to TankerTrackers. The monitoring service attributed part of the increase to market reactions ahead of the reimposition of UN snapback sanctions.
According to Vortexa, despite the official return of sanctions on September 27, Iran’s shipments showed little sign of slowing. The country’s shadow fleet — a network of aging and re-flagged tankers operating outside standard maritime tracking systems — has matured and adapted, sustaining exports in the 1.3–1.6 million bpd range through more efficient ship-to-ship (STS) transfers, particularly to Chinese refiners, Iran’s top buyers.
Observers note that when the sanctions formally snapped back, many expected exports to collapse. Instead, tankers kept loading, ships kept sailing, and China kept receiving cargoes. The result: Iran’s oil continues to flow — but now through a leaner, faster, and more covert export system that has evolved under renewed legal pressure.