TL;DR
- Stake Value: Greg Brockman said his OpenAI stake was worth about $30 billion during May 4 testimony in Musk v. Altman.
- Mission Structure: The case asks whether OpenAI can keep nonprofit control while revising the operating arm.
- Ownership Stakes: Brockman said employees hold about 25 percent of shares, while the foundation holds 27 percent and more than $150 billion.
- Trial Stakes: Upcoming witnesses will test competing claims about Musk’s pledge, OpenAI’s mission, and who controls the operating company.
Greg Brockman’s May 4 testimony in the Musk v. Altman trial gave jurors a new way to measure OpenAI’s nonprofit dispute. Brockman said his stake was worth about $30 billion, turning a long-running fight over mission and control into a question about who stands to gain from the company’s structure.
A second valuation widened the money question before the jury. Brockman also said OpenAI’s foundation holds a stake of more than $150 billion in the company. Separately, Musk testified over the course of three days during the trial’s first week, pressing his argument that OpenAI’s leaders abandoned commitments to keep the lab nonprofit.
OpenAI’s defense puts a different structure in front of jurors. Its own court filing describes a revised corporate form that would leave the nonprofit in place while changing the operating arm.
Brockman’s court testimony included the blunt answer, “I do all the things.” His answer tied the valuation directly to the governance fight rather than leaving it as a detached paper-wealth estimate.
Why the Valuation Raises the Stakes
Compensation details explain why the stake figure matters. Brockman said he still holds a 1 percent stake in Sam Altman’s family office from OpenAI’s early compensation structure, and he also said he did not follow through on an early promise to donate $100,000 to OpenAI.
Share splits make those details more than personal trivia. Brockman testified that employees hold about 25 percent of OpenAI’s shares while the foundation holds 27 percent.
Musk’s remedy request turns that ownership question into a legal threat. He wants a rollback of the for-profit structure, and the requested remedies could force a restructuring that redirects value toward the nonprofit mission.
OpenAI’s response is narrower and more structural. In the court filing, the company says the revised structure could sit under the nonprofit rather than replace it. Jurors now have a direct contrast between Musk’s argument that leaders monetized the mission and OpenAI’s argument that the nonprofit can remain in control even if the operating model changes.
Beyond the current cap table, Brockman also said OpenAI may be exploring a potential IPO. He described the value behind his stake as “blood, sweat, and tears,” framing the wealth as earned through years of work rather than as a windfall detached from OpenAI’s growth.
Mission Promises Meet Present-Day Windfalls
Brockman’s 2017 words make the current dispute sharper, especially after Greg Brockman resumed his role during a period of OpenAI transition. A journal entry cited in court said that to convert to a b-corp without Musk would be wrong.
“it’d be wrong to steal the non-profit from him. to convert to a b-corp without him. that’d be pretty morally bankrupt and he’s really not an idiot.”
Greg Brockman in 2017, OpenAI cofounder
His 2017 journal entry now sits beside testimony that his own stake may be worth tens of billions. Brockman also said the family-office arrangement was disclosed in 2017 after Musk asked.
OpenAI’s earlier control allegation adds another layer to that timeline. The company previously alleged that Musk wanted to merge the organization with Tesla or assume complete dominance, giving the current compensation dispute sharper context. Musk filed a lawsuit against OpenAI in 2024, and Public Citizen later requested an investigation into OpenAI’s nonprofit status.
OpenAI’s for-profit arm remains the central legal target. The company created that arm in 2019 and transferred assets from the nonprofit, making control over the operating company central to the dispute. Charitable-trust claims could also unwind that structure.
What This Means for the Trial
OpenAI’s filing adds a counterclaim to Musk’s moral argument. It says Musk made a $1 billion pledge to the organization at launch and did not fulfill that commitment, giving the company a competing story about who broke with OpenAI’s founding bargain.
For jurors, Brockman’s testimony leaves a sharper factual split before the next week of witnesses. They now have a concrete stake figure, a competing nonprofit-control defense, and a clearer record of what each side says happened to OpenAI’s founding mission.
Next week’s witnesses will test OpenAI’s filing claim that a revised corporate form can leave the nonprofit in charge of the operating arm.