OpenAI CEO Sam Altman looks on during the APEC CEO Summit at Moscone West on Nov. 16, 2023, in San Francisco. (Justin Sullivan/Getty Images/TNS) Justin Sullivan TNS DETROIT - The University of Michigan's endowment appears to be in for a windfall. The university made a $20 million investment in the early days of Open AI that is estimated to be worth $2 billion when the company goes to the public market in a likely initial public offering, according to reports citing court documents.