Chevron's acquisition of Hess

The deal in one paragraph

Chevron agreed in October 2023 to buy Hess Corporation in an all-stock deal worth about $53 billion in equity value, roughly $60 billion including Hess's debt, at a fixed exchange ratio of 1.0250 Chevron shares for every Hess share. On paper it looked like a normal, if enormous, oil and gas consolidation.

In practice it became one of the longest deal fights in recent energy history, because Hess's crown jewel, a 30 percent stake in the Stabroek Block offshore Guyana, sat inside a joint operating agreement with ExxonMobil and CNOOC that gave those partners a right of first refusal over any sale of that stake.

Exxon and CNOOC argued Chevron's purchase of Hess triggered that right and took the fight to arbitration, holding the deal in limbo for about 21 months. A tribunal ruled in July 2025 that the clause did not apply to a whole-company merger, and Chevron closed within a day of the decision.

Why Chevron wanted Hess

Chevron has spent the last decade trying to replace aging legacy production with barrels that are cheaper to produce and longer lived.

Hess brought two assets that mattered: a 30 percent non-operated stake in the Stabroek Block, the largest oil discovery of the past decade, operated by ExxonMobil and estimated to hold well over 11 billion barrels of recoverable oil equivalent at some of the lowest breakeven costs and lowest carbon intensity of any major development worldwide, plus a strong Bakken shale position in North Dakota that added scale to Chevron's US unconventional business.

Guyana was the real prize. Chevron had watched Exxon build a dominant deepwater position there for years with no way to catch up organically, since Exxon operates the block and controls the pace of development. Buying Hess was the fastest route to direct exposure to Guyana's growth without discovering or operating the asset itself, a bet on reserve life and low breakeven barrels at a moment when discoveries this size had become rare across the major oil sector.

Structure and terms: the all-stock exchange ratio

This was a fixed exchange ratio, all-stock merger, not a cash deal and not a floating ratio deal. Each Hess shareholder received exactly 1.0250 shares of Chevron common stock for every Hess share held, a ratio set at signing and unchanged through closing regardless of what happened to either stock price in between.

Based on Chevron's closing price on October 20, 2023, that ratio implied about 171 dollars per Hess share and total equity value of roughly 53 billion dollars, with Chevron also assuming Hess's debt, bringing enterprise value to about 60 billion dollars.

Fixed-ratio all-stock deals carry a specific risk candidates should explain cold: because the ratio never adjusts, the dollar value target shareholders eventually receive moves with the acquirer's stock price all the way to closing.

Over the roughly 21 months this deal took, Chevron's shares moved, and the deal's stated equity value at completion was reported closer to 55 billion dollars, even though the 1.0250 ratio never changed.

That is the mechanic interviewers test when they ask about exchange ratio risk versus a collar: with no collar here, both sides carried full exposure to Chevron's share price for the entire life of the deal, arbitration included.

Chevron chose stock over cash for straightforward reasons. It preserved balance sheet capacity rather than forcing Chevron to raise tens of billions in new debt, and it let Hess shareholders keep upside exposure to the combined company's Guyana growth, a real selling point given how much of the deal's value sat in an asset still years from full output. It also kept Chevron's own buyback program funded undisturbed.

The Exxon arbitration: a right of first refusal nearly kills the deal

Hess did not own the Stabroek Block outright. It held a 30 percent non-operated interest alongside ExxonMobil, which operates the block and owns 45 percent, and CNOOC, which owns the remaining 25 percent, all bound by a joint operating agreement, or JOA, that governs how the three partners work together and, critically, what happens if one wants to sell its stake.

Buried in that JOA was a right of first refusal clause: language giving the other partners an option to buy a departing partner's interest before it can be sold to an outsider, generally on the same terms.

Exxon and CNOOC read that clause broadly. Their position was that Chevron's acquisition of all of Hess amounted to a transfer of Hess's Stabroek interest, and that the clause entitled them to buy that 30 percent stake at the value implied by the Chevron deal, which would have let them split Guyana between themselves and cut Chevron out entirely.

Chevron and Hess read the clause narrowly: it was written to cover direct sales of the Stabroek interest itself, they argued, not a merger in which Chevron was acquiring all of Hess as a company, with Guyana simply coming along as one asset among many.

Because the JOA required disputes to go to arbitration rather than court, Exxon and CNOOC each filed claims with the International Chamber of Commerce in Paris in March 2024, later merged into one proceeding.

That detail matters more than it looks: the fight played out almost entirely behind closed doors, with no public docket and no way for outside analysts, or Chevron and Hess shareholders, to gauge which way the panel was leaning until a ruling landed.

That opacity is a big part of why the deal sat in limbo so long, with both companies operating independently while a private panel interpreted a contract clause almost nobody outside the three companies had ever read.

For interview purposes, this is about as clean a real example as exists of a joint operating agreement provision, usually treated as boilerplate oilfield contract law, becoming the single biggest risk sitting on top of a fifty-billion-dollar merger.

How it played out

The panel's reasoning tracked Chevron and Hess's argument: because Chevron had agreed to buy all of Hess, not carve out its Guyana interest, the right of first refusal did not apply. ExxonMobil said publicly it disagreed with the panel's interpretation but would respect the process. Within a day, Chevron issued roughly 301 million new shares to Hess shareholders and completed the acquisition, folding Hess's Bakken and Guyana assets into its portfolio.

If it comes up in your interview

Here is a spoken answer you could give in under 90 seconds: "Chevron agreed to buy Hess in October 2023 in an all-stock deal worth about 53 billion dollars, mainly to get Hess's 30 percent stake in the Stabroek Block off Guyana, one of the largest oil discoveries in decades, which Exxon operates.

Hess shareholders got a fixed 1.0250 Chevron shares for every Hess share, so the deal's value moved with Chevron's stock price all the way to closing rather than locking in at signing. The deal almost didn't happen.

Exxon and its partner CNOOC argued a right of first refusal clause in the joint operating agreement governing Guyana let them buy Hess's stake themselves instead of letting it pass to Chevron through the merger. That dispute went to private arbitration in Paris starting in March 2024 and dragged on over a year.

In July 2025 the panel ruled the clause didn't apply to a whole-company acquisition, only a direct sale of the Guyana stake, and Chevron closed within a day of that ruling."

Likely follow-ups:

Why did Chevron use stock instead of cash? An all-stock structure let Chevron avoid raising tens of billions in new debt and kept its buyback program funded. It also let Hess shareholders keep exposure to the combined company's upside in Guyana, which mattered because so much of the deal's value depended on production still ramping up.

What is a right of first refusal doing in an oil and gas joint operating agreement? It lets partners in a shared asset control who they end up working alongside. Partners in a JOA share costs and operating decisions for decades, so the clause exists to stop one partner from selling its stake to a rival or weaker operator without first giving the others a chance to buy it.

Why did Exxon lose if the clause was clearly there? The dispute wasn't over whether a right of first refusal existed, both sides agreed it did, it was over what triggers it. The panel found the clause covered a direct sale of the Guyana interest itself, and Chevron's transaction was a purchase of all of Hess as a company, so the clause never activated.

Did the 21-month delay actually hurt Chevron? It created real uncertainty and legal cost, but because this was a fixed-ratio all-stock deal rather than a cash deal funded with a bridge loan, Chevron wasn't paying delay costs on borrowed money. The bigger cost was strategic: Chevron couldn't fully plan its Guyana investment or realize cost synergies until closing.

What this deal teaches

This is a strong case study for three concepts that show up constantly in technical interviews. First, all-stock consolidation logic in a capital-intensive industry: acquirers use stock instead of cash to preserve balance sheet flexibility and let target shareholders share in the combined company's upside, especially when a large chunk of the deal's value sits in an asset that hasn't fully ramped yet.

Second, exchange ratio mechanics: a fixed ratio means both sides agree on a number of shares, not a dollar amount, so value delivered floats with the acquirer's stock price between signing and closing, and without a collar that exposure runs the full length of the deal, arbitration delays included.

Third, the one candidates rarely see coming, joint operating agreements in extractive industries often contain change of control and right of first refusal provisions that function as a hidden veto over a whole merger, even though the merger has nothing to do with the JOA on its face.

Any time you're asked what could delay or kill a deal after signing, contractual rights held by a target's joint venture partners belong on the list alongside antitrust and financing risk.