ST. LOUIS – A new lawsuit accuses Sam Altman, Open AI CEO and St. Louis-raised entrepreneur, of sexually abusing his sister at their childhood home in Clayton, Missouri.

Ann Altman, the younger sister of Sam, filed a federal lawsuit on Monday, alleging that Sam repeatedly groomed, manipulated, and sexually assaulted her over several years in the 1990s and 2000s.

On Tuesday, Sam Altman shared a joint statement (including his mother and two brothers) on social media platform X, denying the allegations. In the statement, Sam also claims his sister has struggled with mental health challenges for years, consistently demanded financial support, and made other false accusations about family members.


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Sam’s statement reads, in part: “All of these claims are utterly untrue. The situation causes immense pain to our entire family. It is especially gut-wrenching when she refuses conventional treatment and lashes out at family members who are genuinely trying to help. We ask for understanding and compassion from everyone as we continue to support Annie in the best way we can.”

The Mahoney Law Firm, representing Ann Altman, says she and Sam have been “estranged for a number of years.”

The lawsuit, filed in the U.S. Eastern District Court of Missouri, alleges that sexual abuse began when Ann was 3 and Sam was 12, then continued until Ann was 11 and Sam was an adult.

Missouri law allows survivors of childhood sexual abuse to file a civil lawsuit against perpetrators until they turn 31.

“We want to commend Annie on her strength and bravery in coming forward as a survivor, and we will fight on her behalf to achieve the justice she deserves,” attorney Ryan J. Mahoney said via a news release Tuesday.

The lawsuit seeks at least $75,000 in damages, along with punitive damages and coverage of lawsuit costs. A hearing over the lawsuit has not yet been scheduled.