Six months into the war on Iran, the largest US oil companies have posted their biggest profits since 2022, selling less oil at far higher prices. But the conflict is also putting their longstanding Gulf investments at risk, exposing the industry’s uneasy balance between wartime gains and mounting geopolitical vulnerability for investors worldwide.

Since the war began on February 28, Brent crude has risen about 22 percent, from $72 to $88 a barrel.

The Strait of Hormuz – through which one-fifth of the world’s oil and natural gas was shipped before the war – remains largely closed to commercial traffic, though Iran and Oman agreed last week on a temporary maritime route. Iran says the strait will not fully reopen until the United States fulfils its commitments under a lapsed interim peace deal, leaving longer-term security and management arrangements unresolved.

In the absence of a lasting resolution, the disruption is likely to continue supporting higher energy prices and creating windfalls for producers, despite placing energy companies’ regional assets and future projects at greater risk.

Rahul Choudhary, vice president of Upstream Research at Rystad Energy, an independent energy research company, said the conflict has already reduced the amount of oil and gas US energy firms are drawing from the Gulf region.

“Overall we expect US companies’ share of gas supplies [from the region] to fall by around 40 percent this year compared to last year [and] the share of oil supplies to drop by 30-35 percent,” he told Al Jazeera.

While higher commodity prices have helped offset the immediate financial impact, Choudhary said prolonged disruption is likely to delay major projects and weigh on the future growth plans of US oil and gas companies with a presence in the region.

Who has profited?

The surge in the oil price since early March, when Iran first closed the Strait of Hormuz, has delivered a windfall for oil companies, but gains have been tempered by challenges in the Gulf.

Chevron has limited exposure to Arab Gulf supply disruptions, with the region accounting for just 5 percent of its total global output. The group reported its highest quarterly profit in six years of $12bn in adjusted earnings on July 31.

ExxonMobil, by contrast, has been far more exposed to disruption in the Middle East, with the closure of the Strait of Hormuz and Iranian attacks on US-linked infrastructure in the region affecting its operations in Qatar and the United Arab Emirates (UAE), which together account for 20 percent of its global equity upstream supply, according to Choudhary.

“We already saw in H1 [the first half of] 2026, the company’s upstream earnings dropped by around $1.3bn compared to H1 2025, due to lower upstream volumes from the Middle East. However, the shortfall was covered well by higher commodity prices,” Choudhary said.

The contrast highlights a broader divide between those US energy companies which have benefitted from tighter global supply – and the corresponding rise in the oil price – and those with assets, partnerships or operations in the Gulf at greater risk of disruption caused by recent attacks on energy facilities.

Where are US energy companies exposed in the Gulf?

The Gulf’s energy sector is dominated by state-owned giants such as Saudi Aramco, Abu Dhabi National Oil Company (ADNOC) and QatarEnergy.

Although these national oil and gas companies retain control over the region’s reserves and core infrastructure, US energy firms have carved out strategic positions across the region.

US companies generate revenue through stakes in production assets, joint ventures, production agreements, refining and petrochemical projects, as well as through long-term contracts to provide equipment, engineering and operational expertise.

ExxonMobil has some of the largest US commercial interests in the Gulf.

The company has been a major partner in Qatar’s LNG sector for decades, holding stakes in several QatarEnergy LNG joint ventures linked to the expansion of the North Field. The field is the Qatari section of the North Field-South Pars structure, the world’s largest natural gas field, which Qatar shares with Iran, where it is known as South Pars. ExxonMobil also holds an interest in the UAE’s Upper Zakum offshore oilfield alongside ADNOC.

Similarly, ConocoPhillips joined the North Field East (NFE) and North Field South (NFS) expansion projects with QatarEnergy in 2022 to increase export capacity at Ras Laffan.

The US group, Occidental Petroleum, has become one of the largest foreign producers in Oman, operating the Mukhaizna heavy oilfield, the country’s biggest producing oilfield. It also holds interests in UAE gas and pipeline projects.

Chevron maintains a smaller but strategically important Gulf footprint. Through Saudi Arabian Chevron, the company operates oil assets in the Saudi-Kuwait Partitioned Zone, including the Wafra field. In July, it said it was exploring potential routes to move Iraqi crude to Mediterranean export terminals, which could reduce reliance on the Strait of Hormuz.

Where have attacks on energy facilities taken place?

According to the Armed Conflict Location and Event Data (ACLED), a US-registered independent conflict monitor, Iran and Iran-backed groups in the region have carried out at least 172 attacks on nonmilitary infrastructure across the six Gulf Cooperation Council (GCC) countries since the US and Israel launched their war on February 28.

Energy infrastructure has been hit hardest, with oil and gas facilities, along with power plants and desalination plants, accounting for nearly half (48 percent) of all strikes on nonmilitary targets.

The UAE, Kuwait and Bahrain have suffered the highest number of successful strikes, with the majority aimed at oil and gas facilities.

Among the sites that have been struck are Kuwait’s Mina Abdullah and Mina al-Ahmadi refineries, the Bahrain Petroleum Company oil refinery, and ADNOC’s al-Ruwais Industrial City and the Habshan gas complex.

There have also been several strikes on Saudi Aramco facilities, most recently a drone strike on July 27 on the Abqaiq processing complex, one of the most critical nodes in Saudi Arabia’s oil infrastructure, processing more than seven million barrels of oil per day.

Nasser Khdour, Middle East assistant research manager at ACLED, said: “Oil and gas facilities, power plants and water desalination plants are likely to remain key targets for Iran because disruption to these sectors can increase economic pressure on Gulf states, while disruption to global energy supplies increases prices and pressure on the US during periods of escalation.”

In March, a drone attack close to the Saudi Aramco-ExxonMobil SAMREF refinery in Yanbu disrupted oil loading at the city’s Red Sea port. While the attack had only minimal operational impact, it highlighted the vulnerability of US-linked energy assets in the region.

Qatar’s Ras Laffan Industrial City, the world’s largest LNG export hub, which hosts major joint ventures between QatarEnergy, ExxonMobil and ConocoPhillips, also came under repeated attack in March, at one point forcing the plant to halt production entirely. In June, an explosion as a result of a “technical malfunction” on Qatar’s Barzan gas project, where ExxonMobil holds a stake, killed at least 13 people.

“In terms of gas assets being impacted, major blows have been [dealt to] companies [that are] part of LNG projects in Qatar: ExxonMobil and ConocoPhillips,” Choudhary said.

He added that ExxonMobil’s share of LNG supply from Qatar is expected to fall significantly this year to about four million tonnes compared with 13 million tonnes last year, while ConocoPhillips has also experienced reduced volumes to one million tonnes this year compared with 2.5 million tonnes last year.

The attacks on Qatar’s LNG infrastructure could have longer-term consequences. Damage to LNG trains at Ras Laffan could take years to repair, according to QatarEnergy, while delays to Qatar’s North Field expansion projects could push back planned supply growth.

“The attack on LNG trains 4 and 6 at Rasgas damaged roughly 13 million tonnes of capacity, which will take anywhere between three to five years to come back online with a total repair cost estimate of around $3bn,” said Choudhary.

He added that the second most impacted gas project has been the Shah gas project in the UAE, in which Occidental Petroleum has a 40-percent stake and where drone attacks in March caused a fire at the gas plant that halted operations.

The conflict has also affected ExxonMobil’s oil interests in the UAE, Choudhary said. Production from Upper Zakum, where ExxonMobil has a 28 percent stake, was reduced between March and May when export routes were disrupted, limiting the ability to move offshore crude.

Beyond the UAE, the most significant impact on US companies’ oilfield operations played out in Iraq. A drone attack hit the Sarsang oilfield in March, followed by an explosion at one of its storage facilities in April, together causing damage to the field.

Looking ahead, Choudhary said higher prices could support cash flows, but prolonged conflict risks could threaten future growth. ExxonMobil’s $10bn Upper Zakum and Qatar LNG expansions could face delays, while ConocoPhillips remains exposed through investments in higher-risk markets, including its planned 42-percent stake in BP’s Kirkuk operations in Iraq.

“For companies like Chevron and Occidental Petroleum, whose presence are in less volatile countries like Israel and Oman respectively, the impact of escalations will not be as severe, as we have not seen significant disruption in these countries,” said Choudhary.

US oilfield service companies in the Gulf

Oilfield service giants, including US firms SLB (formerly Schlumberger), Halliburton and Baker Hughes, provide drilling technologies, equipment and operational expertise across the Gulf, supporting Saudi Aramco, ADNOC and QatarEnergy.

For oilfield service companies, the outlook is mixed, according to Chinmayi Teggi, energy research analyst at Rystad Energy, a research group. While higher oil prices and energy security concerns could lift demand over time, near-term margins remain under pressure from higher logistical costs, supply-chain disruptions and delayed projects.

“For the Big Three (SLB, Baker Hughes and Halliburton), the conflict continues to weigh on regional revenues,” Teggi told Al Jazeera, adding that second-quarter Middle East revenues were down 8-10 percent compared with the previous year across the three companies, while higher oil prices meant revenues were higher in other geographies.

However, a recovery in suspended operations and production could help drive growth into 2027.

For US companies, therefore, the Gulf remains both an opportunity and a risk.

“The impact on US companies will depend on the extent of exposure and countries in which these companies are present,” Choudhary said.

Their investments have secured US access to some of the world’s most important oil and LNG projects, but the conflict has exposed the risk of operating in a region where energy infrastructure has become increasingly vulnerable to geopolitical conflict.

US President Donald Trump has repeatedly warned Iran against restricting access to the Strait of Hormuz, arguing that the waterway must remain open to global commerce.

But for companies with billions of dollars invested across the Gulf, the challenge isn’t just about keeping shipments moving – it is ensuring the infrastructure remains secure, they say.