Oil Markets Whipsaw as Iran Seizes Tanker Amid Fragile Ceasefire

Iran's Islamic Revolutionary Guard Corps seized an oil tanker in a "special operation" in the Gulf of Oman on Friday, as the US military said it disabled two tankers seeking to enter Iranian ports . The statements came just hours after the US and Iran traded fire in the Strait of Hormuz, threatening a fragile pause in fighting and ongoing efforts to reach a lasting ceasefire deal .

Iran's navy seized the Ocean Koi because it had attempted to "disrupt oil exports and the interests of the Iranian nation," according to a statement carried by the Fars news agency . The U.S. sanctioned a tanker of the same name in February, alleging it's part of Iran's fleet of "shadow" vessels that store and ship barrels of sanctioned Iranian oil . Oil prices rose Friday after the U.S. and Iran exchanged fire in the Strait of Hormuz , with Brent crude futures for July delivery rising 1.20% to $101.26 .

Wild Week of Price Swings

The tanker seizure caps one of the most volatile weeks for oil markets in 2026. Crude oil prices experienced one of the most volatile trading weeks of 2026 during the period of May 3 through May 7, as traders reacted to the ongoing U.S.-Iran conflict, disruptions in the Strait of Hormuz, and sudden changes in diplomatic negotiations . June West Texas Intermediate (WTI) crude futures swung violently between a high of $107.46 and a low of $88.66 before stabilizing near $97 a barrel by the end of the week .

According to market data, WTI Crude traded at $71.50 per barrel on Friday, up 0.6%, while Brent Crude stood at $75.20 per barrel, up 0.5% . The sharp price movements reflect how sensitive the market remains to supply disruptions from the Middle East conflict that began in late February.

U.S. crude oil plunged by as much as 15%, to $88 per barrel, and international Brent crude oil fell as much as 11%, to $96 per barrel earlier in the week after a report said the U.S. believed it was nearing a deal to end the war with Iran and eventually reopen the Strait of Hormuz . But President Donald Trump, in a call with an ABC News reporter later Thursday, insisted that the ceasefire remains in effect, saying the strikes were "just a love tap" .

Europe Faces Stock Crunch Despite Price Volatility

While oil prices have gyrated wildly, low stocks of crude and products in Europe are bigger risks for the continent than price alone. In mid-April, the Head of the International Energy Agency said that Europe had "maybe six weeks or so" of remaining jet fuel supplies . On 30 April, the European Commission stated that, while there are no fuel shortages in the EU at present, the EU should start preparing for possible consequences if the situation continues beyond the end of May .

The overall loss in oil exports exceeds 13 mb/d, with associated production curtailment and damage to energy infrastructure in the region resulting in cumulative supply losses of more than 360 mb in March and 440 mb projected for April , according to the IEA's April Oil Market Report. Global observed oil inventories fell by 85 mb in March, with stocks outside of the Middle East Gulf drawn down by a significant 205 mb (-6.6 mb/d) as flows through the Strait of Hormuz were choked off .

The European Central Bank's adverse scenario assumes a much sharper increase in energy prices, with oil and gas prices peaking at USD 119 per barrel and €87 per MWh, respectively, in the second quarter of 2026 . Amrita Sen, founder and director of market intelligence at Energy Aspect, told CNBC that global economies could be "sleepwalking" into a "big recession," saying "This has been the biggest conundrum for us — if anything, we think oil should be higher and the equity market should be a lot, lot weaker" .

Natural Gas Markets Show Surprising Strength

While oil dominates headlines, natural gas markets are showing their own dynamics. Natural gas futures traded in a narrow band near even early on Friday, as traders weighed Thursday's bullish storage surprise against sluggish overall demand typical for this time of year .

Working gas in storage was 2,205 Bcf as of Friday, May 1, 2026, according to EIA estimates, representing a net increase of 63 Bcf from the previous week. Stocks were 75 Bcf higher than last year at this time and 139 Bcf above the five-year average of 2,066 Bcf . According to market data, Henry Hub Natural Gas traded at $3.25/MMBtu on Friday, down 2.4% .

India Feels the Pinch

Inflation in India, the world's third-biggest crude oil importer, accelerated in April as the higher global oil and gas prices started to feed through consumer prices . The annual consumer price index (CPI) is expected to have jumped to 3.8% in April, up from 3.4% in March, a Reuters poll of 46 economists showed on Friday .

The conflict has created ripple effects across global supply chains. The closure of the Strait of Hormuz, through which around 20% of the world's oil trade passes, and attacks on energy infrastructure in Iran and several Gulf Cooperation Council countries led to a large disruption in global oil supplies . Normally, hundreds of ships per day would transit the Strait of Hormuz, bringing more than 20% of the world's oil supply to the global market. On Tuesday, just one ship crossed the strait, according to S&P Global Market Intelligence .

As negotiations continue and military tensions simmer, energy markets remain on edge. ANZ Research's experts warned that "The risk of a proposed U.S. peace deal breaking down will likely keep oil markets volatile" . For now, traders are watching every headline from the Gulf, knowing that the next tanker seizure or ceasefire violation could send prices swinging again.