Microsoft Chief Financial Officer Amy Hood, taking the third question on the FQ3 analyst call Wednesday evening, said that the company's commercial remaining performance obligation excluding OpenAI grew 26% year over year — its slowest growth in three years. The headline RPO number was $627 billion, up 99%. The arithmetic the call did not state but reporters worked through Thursday: if the headline number is up 99% and the ex-OpenAI book is up 26%, OpenAI is roughly 45% of the consolidated $627 billion backlog. That implies an OpenAI RPO obligation of approximately $282 billion. [1]

The number was implicit in the call, explicit in the analyst notes that hit Thursday morning, and stated outright by Yahoo Finance Friday: "Microsoft says OpenAI is driving 45% of the backlog for Azure cloud computing." [2]

The paper's Apr. 30 question of how much of the FQ3 backlog was OpenAI said the print did not name the share. The day before, the paper asked the same question more directly. The answer arrived through an arithmetic carve-out, not a disclosure.

The disclosure comes packaged with three structural facts the call confirmed and the trade press quickly absorbed. First: Microsoft's revenue-share obligation to OpenAI runs through 2030, capped, after which the rev-share to OpenAI ends and Microsoft retains the IP rights royalty-free. [3] Second: Microsoft no longer holds exclusive cloud-provider rights through 2032, the contract revision the paper covered Wednesday. Third: Microsoft's FY2026 capex guide was raised on the call to $190 billion, and Hood attributed the upward revision not to GPU procurement but to memory-component pricing — a binding constraint that Apple's Tim Cook also cited in the company's June-quarter guide that landed Thursday after-close.

Three different binding constraints — counterparty concentration in OpenAI, contractual unwind through 2030, memory-supply inflation through 2027 — now sit on Microsoft's hyperscaler balance sheet at the same time. The 26% ex-OpenAI growth rate is the part that will travel: it is in line with what Microsoft's commercial cloud business has produced in non-AI quarters going back through 2022. The headline 99% number is, as the trade press has begun to say, "OpenAI flavored." [4]

The counterparty concentration question the paper has been carrying since the contract revision is now quantified. At a $282 billion implied OpenAI RPO over a 2.5-year weighted duration, OpenAI's commitment to Microsoft equals roughly $113 billion per year of contracted Azure consumption. OpenAI's own publicly disclosed annualized revenue at last reporting was approximately $11 billion. The gap — between what OpenAI is contractually paying Microsoft and what OpenAI itself is taking in — is the single largest quantitative datum in the AI capex regime, and it sits squarely on the Microsoft balance sheet.

The market read the print bullishly. MSFT closed Wednesday up 4.1%; Thursday's session held the gain. Brett Winton at ARK Invest, in a Thursday analyst note widely circulated on X, said the disclosure removed "the worst case" and that "Microsoft has 45% of its $627B backlog tied to a single counterparty whose own enterprise revenue is barely a tenth of the contracted commitment, but the contract is collateralized by a 27% equity stake at a $135B mark." Bill Gurley, in a Thursday X thread, called the disclosure "the answer to a question Microsoft has been ducking for two quarters" and said the company "is now operationally OpenAI's bank." [5]

The bank metaphor is more than a frame. The Cerebras roadshow that the paper has been tracking runs into the same OpenAI counterparty as customer, lender, and shareholder on a single S-1 page; Microsoft's 27% equity stake at the $135 billion mark is a fourth simultaneous counterparty position, larger than any of the three Cerebras discloses. The Apr. 30 Tumbler Ridge tort docket and Florida criminal probe expansion are now litigation surfaces that Microsoft's revenue-share counterparty is actively defending. The contract revision Microsoft and OpenAI announced Tuesday — the elimination of Microsoft's revenue-share to OpenAI in exchange for royalty-free IP rights through 2030 — was, the call confirmed, not a partial unwind. It was a structural reaffirmation that the two companies are entangled at every layer of the hyperscaler stack through the end of the decade.

Wall Street will reprice this over weeks. The first repricing is happening now. JPMorgan's Mark Murphy, in a Thursday note, raised his Microsoft price target to $585 on the basis that "the OpenAI relationship is now formally durable through 2030 with the IP unwind." Morgan Stanley's Keith Weiss did the opposite — held the rating at overweight but cut the price target by $30, citing "counterparty concentration that materially exceeds prior estimates." Both notes worked from the same 45%/26% split. Both reach opposite conclusions about what to pay for it. [6]

CFO Hood's prepared remarks did not name OpenAI directly when describing the RPO. The carve-out language was: "Excluding our largest single AI commercial contract, commercial RPO grew 26%." The call's third question, from Bernstein's Mark Moerdler, asked Hood to confirm the math: 26% ex-OpenAI plus 99% with OpenAI implies what fraction is OpenAI? Hood said: "The arithmetic is correct. We do not break out individual customer concentration, but the relationship is well known and material." [4]

The transcript is the disclosure. The disclosure is the answer. The question now is what the answer prices.

-- THEO KAPLAN, San Francisco