---
id: "2026-10-29-microsoft-25b-bond-sale-ai-capex"
url: "https://postcutoff.com/e/2026-10-29-microsoft-25b-bond-sale-ai-capex/"
as_of: "2026-11-09T21:13:00+01:00"
date: "2026-10-29"
date_precision: day
category: business
importance: 3
confidence: medium
status: [Partly confirmed]
sources: 5
editor: human editor
human_review: null
version: "2026-10-29"
---

As of: 2026-11-09 21:13 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-10-29-microsoft-25b-bond-sale-ai-capex/

# Microsoft sells $25B of bonds, its first big US bond deal since 2017, to fund AI spending

Full title: Microsoft sells $25B of bonds, its first big US bond deal since 2017, to fund AI spending; orders peak at $115B

On Oct 29, 2026 Microsoft launched a $25B US investment-grade bond sale in up to 10 tranches (2 to 40 years), its first major US issuance since a $17B deal in 2017, to help pay for AI-related capital spending. Orders peaked at about $115B, 4.6 times the deal, making it one of the most sought-after US corporate bond sales on record, per Bloomberg.

## Key facts
- Size: $25B in as many as 10 tranches with maturities from 2 to 40 years (Bloomberg Law, Oct 29)
- Demand: orders peaked at about $115B, 4.6 times the offering, 'one of the most sought-after US corporate bond sales on record' (Bloomberg data, people familiar)
- First major US bond sale by Microsoft since 2017, when it raised $17B; purpose reported as funding AI-related capital expenditures (Bloomberg via Techmeme)
- Context: a day earlier Microsoft reported $45.2B of quarterly capex (fiscal Q1 2027) and $10B of quarterly revenue from OpenAI (see [2026-10-28-microsoft-q1-fy27-openai-10b-revenue](https://postcutoff.com/e/2026-10-28-microsoft-q1-fy27-openai-10b-revenue/index.md)); Bloomberg Law notes investors' portfolios are already 'stuffed with AI-related debt'
- Other hyperscaler debt this year: Oracle's $25B sale in February, Alphabet's repeated dollar and euro deals and Meta's planned ~$95B AI financing (see [2026-10-26-meta-95b-ai-financing-35b-equity](https://postcutoff.com/e/2026-10-26-meta-95b-ai-financing-35b-equity/index.md))

## What happened

Microsoft, one of the few top-rated corporate borrowers, returned to the US bond market for the first time in almost a decade with a
$25B multi-tranche deal to fund AI-related capital spending. Investor demand peaked at about $115B. Most of the details come from
Bloomberg and Bloomberg Law (partly paywalled; the part we read gives the size, the tranches and the order book) and from Techmeme's
summary of Bloomberg's report. Final pricing was not available when this entry was written.

## Why it matters

Even the cash-richest AI spenders now borrow to pay for data centres. The deal follows Oracle, Alphabet and Meta raising tens of
billions in debt this year, and the order book shows that bond investors are still willing to fund the build-out while equity
investors are punishing it (Alphabet fell 12% the same day after reporting negative free cash flow).

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 182 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 121 days after its cutoff
- Gemini 4 Argon (training cutoff March 2026): 212 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 151 days after its cutoff

## Sources

1. [Bloomberg: Microsoft kicks off first US high-grade bond sale since 2017 (Oct 29, paywalled)](https://www.bloomberg.com/news/articles/2026-10-29/microsoft-kicks-off-first-us-high-grade-bond-sale-since-2017) (bloomberg.com, press)
2. [Bloomberg Law: Microsoft eyes at least $25 billion in first US bond since 2017](https://news.bloomberglaw.com/tech-and-telecom-law/microsoft-eyes-at-least-25-billion-in-first-us-bond-since-2017) (news.bloomberglaw.com, press)
3. [Reuters: Microsoft expects to raise $25 billion in US bond sale, source says](https://www.reuters.com/business/finance/microsoft-expects-raise-25-billion-us-bond-sale-source-says-2026-10-29/) (reuters.com, press)
4. [Quartz: Microsoft bond sale of $25 billion for AI spending](https://qz.com/microsoft-bond-sale-25-billion-ai-spending-102926) (qz.com, press)
5. [Bloomberg (Feb 2): Oracle $25 billion bond sale helps ease fears of AI debt wave](https://www.bloomberg.com/news/articles/2026-02-02/oracle-kicks-off-8-part-dollar-bond-sale-amid-ai-borrowing-push) (bloomberg.com, press)

## Changes

- 2026-10-29 (filed): Created (news agent; Techmeme, Bloomberg Law; Bloomberg and Quartz could not be read)

## Related

- 2026-10-28: [Microsoft Q1 FY27: $10B of revenue from OpenAI (11% of the total), Azure +48% to $33.2B, commercial backlog $677B](https://postcutoff.com/e/2026-10-28-microsoft-q1-fy27-openai-10b-revenue/index.md)
- 2026-10-28: [Alphabet Q3 2026: Google Cloud +103% to $30.7B, but negative free cash flow on AI capex](https://postcutoff.com/e/2026-10-28-alphabet-q3-2026-earnings/index.md)
- 2026-10-26: [Meta launches $95B AI stock sale](https://postcutoff.com/e/2026-10-26-meta-95b-ai-financing-35b-equity/index.md)
- 2026-10-13: [Tencent markets a roughly $5B dollar and offshore-yuan bond sale, mostly to pay for AI chips](https://postcutoff.com/e/2026-10-13-tencent-5b-bond-sale-ai-capex/index.md)
- 2026-10-01: [AI-driven credit startup AIR Platforms rates Anthropic BBB and OpenAI BB+ (junk) in unsolicited shadow ratings](https://postcutoff.com/e/2026-10-01-air-platforms-shadow-ratings-anthropic-bbb-openai-bb-plus/index.md)