OpenAI CEO Sam Altman has been revealed as one of the top shareholders in Reddit Inc. as the social media company gears up for its initial public offering or IPO. What Happened: Altman, who briefly served as Reddit’s interim CEO in 2014, holds a significant stake in the company, according to its IPO filing, first noted on Bloomberg. Entities linked to Altman possess 8.7% of Reddit’s outstanding shares, including 789,456 Class A shares and 11.4 million Class B shares. Interestingly, Altman owns more shares than Huffman. According to the filing, the Reddit CEO owns 368,954 Class A shares and 4.3…