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A bond sale linked to Microsoft’s data center ambitions is on track to reach roughly $4 billion, up from an initial $3.9 billion target, as investor appetite for AI-related infrastructure debt shows no signs of cooling.
The deal and its trajectory
The bond issuance, tied to Microsoft’s expanding data center footprint, was originally sized at $3.9 billion before strong demand pushed the total toward the $4 billion mark.
Consider what happened in April 2026 with a related transaction. A Blackstone-backed debut bond offering by QTS, financing a Microsoft data center in Phoenix, attracted approximately $12.5 billion in investor demand. That’s more than three times the size of the actual deal.
Microsoft is no stranger to the corporate bond market. The company executed a $19.75 billion issuance back in 2016, one of the largest corporate bond deals in history at the time. This time around, the motivation is more specific: data centers built to handle the compute demands of an AI-driven future.
Why investors can’t get enough
Microsoft, Amazon, Meta, and Alphabet are collectively planning hundreds of billions of dollars in capital expenditures for 2026. Microsoft alone has guided toward approximately $190 billion in spending, and much of it will flow into data centers, networking equipment, and the physical infrastructure that makes AI models actually run.
The broader AI infrastructure financing wave
The QTS deal in April set the template. A purpose-built data center, a blue-chip tenant commitment from Microsoft, and a bond structure that gives fixed-income investors a way to participate in the AI boom without touching equity volatility. The $12.5 billion in demand for that single offering signaled that institutional investors view AI infrastructure debt as a distinct, attractive asset class.
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