Iran Oil Exports Collapse by Over 90% as US Maritime Blockade Takes Hold

## Iran Oil Exports Collapse by Over 90% as US Maritime Blockade Takes Hold Iranian oil exports from the Gulf region have plummeted by more than 90%, with maritime traffic data revealing a dramatic contraction in seaborne shipments during May, according to analysis published by United Against Nuclear Iran (UANI). The figures paint a stark picture of the effectiveness of renewed US pressure on Iranian energy exports. Just four tankers carrying petrochemicals were recorded departing the Gulf region with Iranian cargo during the month — a sharp decline that underscores the tightening grip of Washington's enforcement campaign on Tehran's primary revenue stream. ### Enforcement Pressure Reshapes Tanker Traffic The near-total suppression of Iranian crude and petroleum product exports represents a significant development for global tanker markets and regional energy flows. Iran had, in recent years, maintained a shadow fleet of tankers — often operating with obscured ownership structures, flag-of-convenience registrations, and transponder manipulation — to circumvent successive rounds of Western sanctions. The collapse in May shipment volumes suggests that this so-called 'dark fleet' infrastructure is facing unprecedented operational disruption, whether through direct interdiction, port access restrictions, or the chilling effect of secondary sanctions on buyers, insurers, and ship operators. ### Market and Geopolitical Implications Iran has historically been capable of exporting between 1 and 1.5 million barrels per day during periods of sanctions relief, with volumes rising significantly in recent years as enforcement waned. A sustained reduction to near-zero levels would remove a meaningful supply source from global oil markets, with potential implications for crude pricing and tanker demand on key trade routes. For the tanker sector, the development is a double-edged signal. While reduced Iranian volumes tighten available supply in the short term, the broader crackdown on shadow fleet operations — many of which have been linked to Iranian, Russian, and Venezuelan cargo — continues to reshape the risk landscape for vessel owners, P&I clubs, and commodity traders. UANI, which tracks Iranian sanctions compliance through vessel monitoring and trade data, has been a consistent source of intelligence on Iranian export activity. The organisation's May findings will likely be closely scrutinised by policymakers, compliance officers, and market analysts monitoring the trajectory of US maximum pressure policy. *Source: Seatrade Maritime / UANI*