ExxonMobil has failed in its attempt to block Chevron’s US$ 53 billion acquisition of Hess, clearing a path for one of the biggest oil industry deals in years. An arbitration panel ruled this week that Exxon did not have the right to buy Hess’s 30% stake in Guyana’s Stabroek oil block —a central asset in Chevron’s takeover bid. The decision allows Chevron to proceed with regulatory approvals and shareholder votes expected to heppen later this year.
At the heart of the dispute was Exxon’s claim that Hess’s stake in the Guyanese field, where Exxon, alongside China’s CNOOC, is the operator, could not be sold without giving Exxon a first right of refusal. The tribunal, however, sided with Hess and Chevron, concluding that the broader corporate transaction didn’t trigger Exxon’s rights under the existing operating agreement. The decision is seen as a victory for Chevron’s legal strategy.
The Stabroek block is one of the world’s most valuable oil discoveries in decades, holding an estimated 11 billion barrels of oil. Hess’s stake has become a strategic gem for any energy major seeking long-term exposure to low-cost barrels. Chevron’s move to secure this position is widely seen as an effort to enhance its portfolio amid uncertain energy transition timelines and geopolitical risks.
Losses and challenges
For Exxon, the setback is significant. While it remains the dominant operator in Guyana, the failed arbitration signals limitations to its control over the region’s expanding oil frontier. Analysts say Exxon may now shift its focus to accelerating drilling and production in Guyana and elsewhere to defend its market position and boost returns to shareholders. The company has already doubled down on its Guyana investments, with plans to increase output to over 1.2 million barrels per day by 2027.
The deal, first announced in October 2023, must still clear regulatory reviews, particularly in the US —which should not be a problem under Trump administration. Still, with arbitration behind them, executives are confident the transaction will close in early 2026. If it does, it will mark the largest energy deal since Exxon’s own merger with Mobil in 1999.
