Musk v. OpenAI: ~$150B Litigation

Elon Musk sued OpenAI, Sam Altman and Greg Brockman, claiming they betrayed OpenAI’s nonprofit founding mission by converting it into a for-profit enterprise, and sought up to roughly $150B in disgorgement. A jury found the claims time-barred in May 2026 without reaching the merits, and Musk has taken the fight to the Ninth Circuit.

LATEST DEVELOPMENT · MAY 18, 2026

A unanimous nine-member advisory jury found all of Musk’s claims time-barred after under two hours of deliberation, and Judge Gonzalez Rogers adopted the verdict. Musk’s counsel immediately announced an appeal to the Ninth Circuit, arguing the case was decided on a calendar technicality and that the continuing-violation doctrine should extend the limitations period.

PREDICTED OUTCOME

AI-GENERATED · METHODOLOGY →

Respondent win ~72% likely HORIZON: Ninth Circuit ruling late 2027 to mid-2028 CONFIDENCE: MEDIUM

Most likely the Ninth Circuit affirms the limitations judgment for OpenAI, Altman, Brockman and Microsoft, roughly a 72% call, with a decision landing between late 2027 and mid-2028 after briefing through 2027 and argument. The strongest driver is posture: Musk lost after a full three-week trial where a unanimous advisory jury took under two hours and the district judge independently adopted the finding, so accrual and inquiry-notice questions come up as fact-bound determinations reviewed for clear error rather than clean legal error. Musk’s continuing-violation theory is a weak fit for fraud and unjust-enrichment claims premised on public conduct dating to 2017-2019, and the panel has an easy affirmance path without touching the never-decided merits. Expect no money to change hands and no unwinding of the October 2025 restructuring, leaving the $150 billion disgorgement demand at zero, with the residual exposure being OpenAI’s harassment counterclaim, which OpenAI has more reputational than financial reason to press and will probably drop or trade away. The leading alternative, at roughly 20%, is a narrow reversal or remand on when the fraud claim accrued, which would revive the merits questions and put the case back before Gonzalez Rogers in 2028-2029. A negotiated global peace between Musk and OpenAI, folding in the xAI-related disputes, is possible but sits below 10% given the personal animus and OpenAI’s incentive to bank a clean win. Watch for a Rule 50/59 denial and the opening brief’s framing: if Musk leans on excluded fiduciary-duty and charitable-trust theories rather than pure accrual, affirmance odds rise further.

Loss after full trial; fact-bound limitations finding, clear-error review · Judge independently adopted unanimous advisory verdict · Continuing-violation theory poor fit for 2017-2019 public conduct · Affirmance base rate high in Ninth Circuit civil appeals · Mutual animus makes settlement unlikely; OpenAI holds the win

Generated by claude-opus-5 on Aug 4, 2026, from this case’s record only. It stands until a major development changes the record. Not legal or investment advice. How predictions are made →

BACKGROUND

Elon Musk, an OpenAI co-founder and early funder, sued Sam Altman, Greg Brockman, OpenAI and Microsoft, alleging they induced his support with promises that OpenAI would remain a nonprofit developing AI for the benefit of humanity, then diverted the enterprise to private gain, culminating in its October 2025 restructuring into a public benefit corporation controlled by the OpenAI Foundation. First filed in California state court in February 2024, withdrawn, and refiled federally in August 2024, the case reached trial in trimmed form: Judge Yvonne Gonzalez Rogers denied a preliminary injunction against the conversion in March 2025 but ordered an expedited trial, and in May 2025 sent fraud and unjust-enrichment claims forward while excluding other theories. OpenAI counterclaimed in April 2025, calling Musk’s campaign, including a $97.4B ‘sham’ takeover bid, bad-faith harassment.

At a three-week trial in Oakland beginning April 27, 2026, jurors heard from Altman, Brockman, Microsoft CEO Satya Nadella and Musk himself. On May 18, 2026, a nine-member advisory jury unanimously found all of Musk’s claims time-barred after less than two hours of deliberation, and Judge Gonzalez Rogers adopted the verdict, resolving the case on limitations grounds without deciding whether OpenAI betrayed its founding promises. Musk, who sought up to roughly $150B in disgorgement plus removal of Altman and Brockman and an unwinding of the restructuring, dismissed the outcome as a technicality and is pursuing a Ninth Circuit appeal, invoking among other things the continuing-violation doctrine.

TIMELINE

MAY 18, 2026JUDGMENT

Advisory jury finds all claims time-barred. Verdict adopted

Nine jurors unanimously find the claims untimely after under two hours of deliberation. Judge Gonzalez Rogers adopts the verdict and Musk announces a Ninth Circuit appeal.

Jury dismisses all claims — NPR
APR 27, 2026HEARING

Jury trial begins in Oakland

Over three weeks, jurors hear testimony from Altman, Brockman, Satya Nadella and Musk.

Musk v. Altman — Wikipedia
MAY 1, 2025PROCEDURAL

Claims narrowed for trial

Fraud and unjust-enrichment claims proceed. False-advertising and breach-of-fiduciary-duty theories are excluded.

Musk v. Altman — Wikipedia
APR 2025FILING

OpenAI counterclaims against Musk

OpenAI accuses Musk of a bad-faith harassment campaign, including a ‘sham’ $97.4B takeover bid for OpenAI’s assets.
MAR 4, 2025PROCEDURAL

Preliminary injunction denied. Expedited trial ordered

Judge Gonzalez Rogers declines to block the for-profit conversion, finding likelihood of success a toss-up, but offers an expedited trial on the core claims.

Musk v. Altman — Wikipedia
AUG 5, 2024FILING

Musk refiles in federal court

Refiled in the N.D. Cal. with expanded fraud claims. Later amendments added X.AI Corp. as plaintiff and antitrust theories against Microsoft.

Musk v. Altman — Wikipedia
JUN 11, 2024PROCEDURAL

Musk withdraws the state suit

The complaint is withdrawn without explanation a day before a scheduled hearing on OpenAI’s demurrer.
FEB 29, 2024FILING

Musk sues OpenAI and Altman in California state court

Musk v. Altman — Wikipedia