OpenAI’s Altman Listed as Major Reddit Shareholder in IPO Filing

OpenAI Chief Executive Officer Sam Altman is one of the biggest shareholders in Reddit Inc., according to the regulatory filing hailing the social media company’s plans for an initial public offering.

Entities affiliated with Altman hold 8.7% of Reddit’s outstanding shares, according to the S-1, which was made public Thursday. That includes 789,456 Class A shares and 11.4 million Class B shares. Reddit’s largest shareholder is Advance Magazine Publishers Inc., part of the Newhouse family publishing empire, with about a third of the voting power.

Altman has longstanding ties with the San Francisco-based social media company. Altman ...