US MTBE prices at FOB Gulf Coast surged 6.39% in early June 2026, driven by peak summer gasoline blending demand, consecutive US gasoline inventory drawdowns, and the recent reports confirmation of unprecedented Hormuz supply losses exceeding 1 billion barrels with 14 mb/d shut in. Iran's rejection of ceasefire terms and Trump's warnings of intensified military action sustained extraordinary geopolitical risk premiums. LPG and naphtha feedstock tightening reinforced elevated production costs. Prices are anticipated to remain firm through June as the summer driving season sustains peak blending sector procurement urgency.
Methyl Tert-Butyl Ether (MTBE) prices at FOB US Gulf Coast surged 6.39% in early June 2026, as the convergence of peak US summer gasoline blending season demand, the reports confirmation of unprecedented Middle East supply losses exceeding 1 billion barrels, consecutive US gasoline inventory drawdowns, and renewed concerns about Hormuz transit normalisation timelines produced an extraordinary bullish environment for octane-enhancing blendstocks at the world's most critical MTBE export hub.
With Hormuz tanker traffic still restricted, cumulative supply losses from Gulf producers already exceed 1 billion barrels with more than 14 million barrels per day of oil now shut in — an unprecedented supply shock — while global oil supply is projected to fall 3.9 million barrels per day across 2026. Despite Saudi Arabia and the UAE successfully redirecting some exports to terminals outside the Strait, the systemic supply deficit sustaining elevated crude, naphtha, and LPG feedstock costs maintained the extraordinary MTBE production cost premium that has characterised the US Gulf Coast market since the conflict began.
The summer driving season provided a powerful demand-side catalyst. US gasoline inventories fell by 0.6 million barrels in the latest weekly report, marking continued consecutive drawdowns, while gasoline futures surged over 6% after Trump signalled potential military action against Iran, with Iran simultaneously rejecting ceasefire proposals and asserting that the Strait of Hormuz would remain closed and firmly under IRGC Navy control. This combination of physical inventory drawdown and geopolitical escalation drove blenders to aggressively secure MTBE forward cover at any available price level, creating the demand urgency that sustained the 6.39% early June price surge. Feedstock dynamics tightened as the conflict risk raised concerns over LPG and naphtha flows through the Strait of Hormuz, lifting butane and related blendstock pricing and feeding into global MTBE sentiment, with US sellers defending higher MTBE offers as traders priced in potential disruptions to future cargoes.
Export demand provided an additional structural floor, with US Gulf Coast MTBE barrels continuing their extraordinary flow into Latin American markets where blenders rely heavily on MTBE and have been unable to source from disrupted Middle Eastern producers.
Looking ahead, US MTBE prices are anticipated to remain elevated through June as the summer driving season sustains peak blending demand, global oil demand still set to outpace supply by 1.78 million barrels per day in 2026 despite strategic reserve releases of 400 million barrels providing a temporary buffer. Any confirmed Hormuz flow normalisation would introduce downward price pressure; however, with Iran maintaining the blockade position and Trump warning of potential intensified military operations, the structural conditions sustaining US MTBE's extraordinary pricing power are expected to persist through at least Q3 2026.
