Software King of the World, Microsoft has launched a $25 billion bond offering to help finance its enormous AI infrastructure spending, attracting an extraordinary $115 billion in investor orders.
Vole’s return to the US corporate bond market on 29 October marked its first major domestic debt offering in more than nine years. Demand reached about 4.6 times the amount sold, making it one of the most heavily subscribed American corporate bond offerings on record.
According to Bloomberg and Reuters, Vole offered debt in as many as ten tranches, with maturities ranging from two to 40 years. Some investors will therefore be collecting interest on Microsoft’s borrowing until 2066, by which time the industry’s current enthusiasm for AI might finally have produced a satisfactory business plan.
Microsoft will use the proceeds for general corporate purposes, including capital expenditure, as it continues building data centres, purchasing processors, and expanding the infrastructure required to support its Azure cloud platform and AI services.
Vole’s exceptionally strong credit rating helped attract demand. The company holds AAA ratings from Moody’s and S&P Global Ratings, placing it among a tiny group of American corporations considered exceptionally reliable borrowers. Its previous major US investment-grade bond sale raised $17 billion in 2017.
Initial pricing discussions suggested that the longest-dated bonds, maturing in 2066, would offer yields up to 1.35 percentage points above comparable US Treasury securities.
Microsoft’s borrowing comes as the technology industry increasingly turns to capital markets to support its extraordinary infrastructure ambitions. AI data centres require enormous investments in processors, memory, networking equipment, cooling systems and electricity supplies before they can generate revenue from customers.
The spending spree is pressuring even the richest technology companies. Alphabet recently reported negative free cash flow as its AI spending accelerated, triggering a dramatic collapse in its share price. Microsoft has maintained a stronger cash position, but its borrowing shows that even profitable software giants are seeking more financial flexibility.
Microsoft chief financial officer Amy Hood has previously said the company would consider raising capital when market conditions are attractive. The company expects to maintain positive free cash flow through its financial year ending June 2027, allowing it to finance expansion without relying entirely on additional borrowing.
The reception contrasts with the increasingly difficult financing conditions confronting some smaller AI infrastructure providers. Companies carrying substantial debt and lacking Microsoft’s established revenue streams face higher borrowing costs as investors become more selective about financing ambitious data centre projects.
Microsoft’s success could encourage other large technology companies to issue bonds as long as demand remains strong. The industry faces infrastructure commitments totalling hundreds of billions of dollars, creating a growing market for corporate debt directly or indirectly tied to AI development.
The transaction follows Alphabet’s $25 billion bond offering in August and highlights the expanding financial commitments behind the AI boom. With Microsoft’s longest-dated securities extending four decades into the future, investors are being asked to finance infrastructure whose commercial value will depend on technologies and business models that are still evolving.
