Microsoft CorporationMicrosoft's 27% stake in OpenAI could be worth $270 billion at a $1 trillion IPO, a significant unrealized gain.

OpenAI is reportedly aiming for a 2027 initial public offering at a valuation of $1 trillion or more, a move that could significantly boost Microsoft, which holds a roughly 27% stake in the artificial intelligence company. Microsoft disclosed last October that its investment was valued at about $135 billion on an as-converted diluted basis, and a $1 trillion listing would lift that stake to approximately $270 billion, equal to about 9% of Microsoft’s $2.9 trillion market capitalization. OpenAI confirmed in June that it had filed confidential IPO paperwork with the Securities and Exchange Commission, and The New York Times reported that CEO Sam Altman is leaning toward a 2027 debut rather than late 2026 because he has refused to accept a valuation below $1 trillion. Microsoft shares have fallen about 19% this year and trade nearly 30% below their 52-week high, even as the company’s fiscal third-quarter revenue rose 18% to $82.9 billion and Azure cloud revenue grew 40%. The potential IPO could force the market to assign a public value to a stake that has been largely overlooked, though the timing and final valuation remain uncertain and future funding rounds may dilute Microsoft’s percentage.
Microsoft CorporationMicrosoft's 27% stake in OpenAI could be worth $270 billion at a $1 trillion IPO, a significant unrealized gain.
New York Times CompanyOpenAI is targeting a $1 trillion IPO, a major valuation milestone for the company.