Strait of Hormuz Non-Iranian Crude Flows Jump 50% in June as US Blockade Halts Iran Shipments

The Quick Take

• Non-Iranian crude oil flows through the Strait of Hormuz surged 50% in June's first 10 days to 1.8 million barrels per day
• Iranian oil shipments remain effectively halted under a US-imposed blockade as Gulf Arab producers ramp exports to fill the gap
• Gulf Arab producers are absorbing the supply vacuum left by Iran's blocked exports, sustaining overall global oil flow volumes

The 50% month-on-month surge in non-Iranian crude oil transiting the Strait of Hormuz to 1.8 million barrels per day in the first 10 days of June reflects a significant redistribution of Gulf supply as US-imposed sanctions have halted Iranian shipments entirely. Gulf Arab producers — primarily Saudi Arabia, the UAE, Kuwait, and Iraq — are collectively ramping export volumes to fill the demand gap left by Iran's effective exclusion from global oil markets. This shift represents one of the most rapid export re-routings through the Strait in recent years, with direct pricing implications for Asian refiners.

For global oil markets, the supply substitution narrative is directionally bearish for crude prices in the near term, as the export vacuum left by Iran is being filled rather than creating a hard supply shortage. However, the available Gulf spare capacity buffer above current output levels remains finite, and any further disruption at the Strait — through sabotage, miscalculation, or physical closure threats — could quickly flip the supply picture from manageable substitution to acute shortage. Indian state refiners, which historically sourced discounted sanctioned Iranian crude, now face higher spot prices for non-sanctioned Gulf barrels.

Key metrics to watch: daily vessel transit data through the Strait of Hormuz, OPEC+ spare capacity utilization rates, and any signal from the US administration that the blockade scope is expanding or contracting. The decisive macro variable is whether the US-Iran diplomatic track — which global bank stocks are already pricing in optimistically — results in a sanctions rollback that brings Iranian barrels back to market. A deal would sharply reverse the current Gulf producer export windfall and put downward pressure on Saudi Arabia's near-term revenue trajectory and OPEC+ internal cohesion.

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