❯ Microsoft Filings Show $24.1B in Revenue From OpenAI in Fiscal Year Ended June

CONCENTRATIONBloomberg, citing regulatory filings, reports that Microsoft recorded $24.1 billion in revenue from OpenAI in the fiscal year ended June. On that basis, this one customer contributed more than half — possibly close to 70% — of Microsoft’s total AI revenue. A Microsoft spokesperson confirmed the figure includes all sales and revenue sharing from OpenAI. Backed out from Microsoft’s previously disclosed AI business growth rate, the full-year AI revenue pool amounts to roughly $34 billion.

SCOPEThis disclosure is the first to show what Microsoft’s “AI business” category actually contains. Microsoft’s definition of AI revenue is quite broad — it includes revenue from all AI customers as well as AI-specific products sold to any customer. Previously, the market assumed the number was supported by a wide rollout of Copilot subscriptions and Azure AI services, and investors applied a “multi-customer, sustainable” valuation logic. Now the filing lays out the structure: after removing OpenAI, the remainder is less than $10 billion. What’s more, money flows in both directions between Microsoft and OpenAI — Microsoft is OpenAI’s largest shareholder and cloud provider, and OpenAI pours much of the capital it raises back into Azure, creating a closed loop. That loop looks like synergy in a growth phase, but in a slowdown it is concentration risk.

VALUATIONAnalysts who use Microsoft’s AI revenue as a demand thermometer need to rework their models: they previously read the figure as a gauge of enterprise AI adoption; now it is closer to a proxy for OpenAI’s cloud spending. The most directly affected is Azure’s growth narrative — if OpenAI’s capex pace changes, Microsoft’s AI revenue curve will move with it. For Microsoft’s own sales organization, the pressure falls on the remaining sub-$10 billion: only if that business accelerates can AI revenue be detached from a single customer.

▪ SIGNALMicrosoft’s largest AI customer is also one it invested in itself — in a growth phase the ledger reads as synergy; otherwise, it is exposure.