OpenAI CEO为"美国贴吧"第三大股东，曾任8天临时CEO

Sam Altman, the CEO of OpenAI, has indeed been involved with Reddit, often referred to as an "American forum." He was appointed as a temporary replacement for Yishan Wong, who resigned from his position as CEO of Reddit in November 201 Altman held this role for approximately one week until Ellen Pao took over as interim CEO before becoming the permanent CEO herself in June 201

Regarding his status as a shareholder, Sam Altman was an early investor in Reddit and held a significant stake in the company. However, details about his current shareholding or ranking among shareholders may have changed over time due to various funding rounds, acquisitions, and other corporate actions. As of my knowledge cutoff in 2023, specific details regarding his current position as a shareholder or any changes in his investment might require uptodate financial reports or statements from Reddit or related sources for accurate information.