September 9, 2025 | San Francisco, USA (The Arabian Wall Street) — Sam Altman, CEO and cofounder of OpenAI, has put his Hawaii mega-estate on the market for $49 million, according to sources close to the deal. The property, located on Hawaii’s Big Island, boasts sweeping views of Kailua Bay, the Pacific Ocean, and includes a private marina.
Altman purchased the 10-bedroom oceanfront mansion for $43 million in 2021. Built by de Reus Architects in 2011, the estate features luxurious amenities, including a five-bedroom guesthouse, movie theater, and 10 bathrooms. The listing highlights its exceptional privacy and advanced security systems ensuring discretion and peace for potential buyers.
Sotheby’s real estate agent Brian Axelrod, who listed the property, described it as “the most amazing property I’ve ever seen during my career”, though he declined to comment on the sale process or number of property tours.
Ownership details
Public records show that the estate is owned by Big Surf LLC, a company previously registered to Altman’s San Francisco property. The LLC’s manager is Altman’s cousin, Jennifer Serralta, the COO of a family office linked to Altman’s ventures.
The backdrop
While Altman’s stake in OpenAI is reportedly “immaterial,” the sale of his property comes as OpenAI prepares for an employee share sale worth $10.3 billion, which could value the company at up to $500 billion. Despite his wealth, Altman has made clear that he won’t personally benefit from the upcoming stock sale.
Altman’s wealth, estimated by Forbes at $2 billion, stems not from his OpenAI equity but from his angel investments. It remains unclear how he plans to use the proceeds from the Hawaii estate sale.
Should the sale go through, Hawaii will lose one billionaire landowner, with Altman potentially using the funds to further invest in his extensive real estate holdings.
