Prior to the surging popularity of OpenAI's ChatGPT, which was released to the public in late 2022, Altman was best known as a startup investor and as the former president of Y Combinator. Altman's investment portfolio includes past or present stakes in Airbnb, Uber, Instacart, Stripe and Asana, but one of his top bets was Reddit. Altman was on the social media platform's board until around January 2022, when the company said he had recently stepped down.

Reddit went public in March at $34 a share.