The Hyperscaler Funding Gap: How Big Tech's AI Capex Is Being Paid For

The five largest AI spenders, Microsoft, Alphabet, Amazon, Meta and Oracle, still cover almost all of their capital spending from operating cash in aggregate. Four of the five reported negative free cash flow in their latest quarter, though, and are closing the gap with bonds, new stock and leases.⁠¹ Over the latest four quarters their combined capex was $691 billion against $724 billion of operating cash, and they sold about $229 billion of bonds in 2026 through 29 October, against $108 billion in all of 2025.⁠¹ Confidence: moderate on those totals, which one analyst derived from SEC filings, and low on the $1 trillion figure for 2027, which analysts project and no company has committed to.⁠²

Cash flow covers most of the bill in aggregate, not at four of five

Sanjeev Pati's analysis of SEC filings for the five companies puts their combined capex over the latest four quarters at $691 billion, against $239 billion in calendar 2024.⁠¹ Operating cash over the same period was $724 billion, so capex took 95% of it, against 50% in 2024, and combined free cash flow fell from $239 billion to $33 billion.⁠¹ Without Microsoft it was negative $27 billion.⁠¹

Measured Using one formula for all five, four had negative free cash flow in their latest quarter: Amazon at negative $34.8 billion, Alphabet at negative $9.1 billion, Oracle at negative $5.4 billion and Meta at negative $1.2 billion, while Microsoft produced positive $18.6 billion.⁠¹ Amazon's quarter was the weakest of the five, and the pressure on its cash flow alongside its cloud growth is covered in Amazon's AWS growth and cash-flow pressures.

Alphabet's two negative quarters are its first since its filings begin in 2007, and Meta's is its first since 2012.⁠¹ The earlier reaction to Alphabet's results is in Alphabet's AI spending and cash burn. Alphabet and Meta have also bought back no shares in 2026, after $39.8 billion and $26.25 billion of buybacks in the first nine months of 2025.⁠¹

Cash flow still funds most of the spending in aggregate, and the shortfall at four companies is being financed from outside.⁠¹

What was measured, by whom, and who paid

None of the sources here is a company's own funding plan. They are SEC filings read by an analyst, company announcements reported by news agencies, rating-agency estimates and sell-side forecasts. Figures from filings and announcements are measured or reported, and every 2027 number is a forecast. Pati computed his figures from XBRL company facts and bond term sheets and states the method in his post, but this article did not rerun them.

Bonds, stock and a first Microsoft bond since 2017

Pati's tranche-by-tranche count has the five selling about $229 billion of corporate bonds in 2026 through 29 October, against $108 billion in 2025 and an average of $28 billion a year from 2015 to 2022.⁠¹ Their bonds, notes and finance leases together rose from $281 billion at the end of 2024 to $642 billion at the end of September 2026.⁠¹ Amazon's long-term debt rose from $65.6 billion in December to $173.1 billion in September.⁠¹ S&P Global Market Intelligence counts $326 billion of debt raised in 2026 by the same five, triple the prior year.⁠³

Reported Microsoft sold $25 billion of investment-grade bonds on 29 October, its first US investment-grade sale since 2017, in 10 tranches from two to 40 years, and drew $115 billion of orders at the peak, 4.6 times the offering.⁠⁵ CFO Amy Hood said the day before that Microsoft would raise additional funds when it believes that is attractive, and CreditSights estimated the deal raises its gross lease-adjusted leverage by slightly more than a tick, to 0.7 times.⁠⁵ Microsoft was the only one of the five with positive free cash flow, and its bond debt had fallen 21% before the sale.⁠¹ Bloomberg cautioned that the demand is not an all-clear, since the cost of credit default swaps on Broadcom and SpaceX debt reached record highs.⁠⁵

Equity is the newer channel, and it carries shareholder dilution that bonds do not. Alphabet priced an $84.75 billion offering in June, including a $40 billion at-the-market program and a $10 billion private placement to Berkshire Hathaway.⁠⁷ By 30 September its 10-Q showed $42.9 billion of new shares and $19.1 billion of convertible preferred stock raised, on top of $85.2 billion of bonds.⁠¹ Meta launched about $35 billion of offerings on 26 October, $22.5 billion of Class A common stock and $12.5 billion of mandatory convertible preferred stock, with up to $60 billion more through an at-the-market program once its new non-voting Class C shares trade, expected in the first quarter of 2027.⁠¹⁠⁴⁠⁸ The structure of Meta's equity fundraising plan is the largest of the equity channels described here. Nvidia, AMD and Broadcom expressed interest in buying up to $5 billion of the Class A stock, so suppliers would be holding stock in a large customer.⁠⁴ Oracle sold $19.9 billion of stock through an at-the-market program in its quarter ended 31 August.⁠¹

Leases hold the biggest obligations that are not yet on balance sheets

A lease that has been signed but has not started appears in a filing's notes and not as a liability, so it is missing from the debt figures above. Reported Moody's counted $969 billion of undiscounted future lease payments across the five at the end of 2025, of which $662 billion was for leases not yet commenced, equal to 113% of their adjusted debt.⁠¹ At 30 September 2026, Microsoft reported $364.6 billion of leases signed but not started, Meta $355.73 billion and Alphabet $130.5 billion.⁠¹ By this article's addition those three total $850.8 billion, more than Moody's five-company figure nine months earlier, though the two sources date and scope their figures differently.

Meta held $82.45 billion of cash and securities against $80.92 billion of long-term debt at 30 September, before counting its leases not yet started.⁠⁴⁠¹ Microsoft's finance-lease liabilities, which are on its balance sheet, nearly doubled from $36.1 billion to $71.0 billion in the same filing.⁠¹ TechCrunch reports $45.2 billion of Microsoft capex for the quarter, while Pati's cash-only measure is $39.4 billion, and Pati's note says his measure does not adjust for finance leases.⁠³⁠¹

At the end of 2025, the five companies' unstarted leases alone were equal to 113% of their adjusted debt.⁠¹

Forecasts keep rising while actual spending can come in lower

Forecast Moody's raised its 2026 hyperscaler capex projection from $700 billion in March to $785 billion and says 2027 will approach $1 trillion.⁠⁹ Meta's financial guidance now runs from $135 billion to $145 billion, after its lower end rose from $130 billion a week earlier.⁠⁴ Alphabet expects to spend up to $205 billion this year and more in 2027, against $180 billion to $190 billion at its first-quarter call.⁠³⁠⁷

Actual spending can undershoot. Microsoft's quarterly capex of $45.2 billion came in below the $50 billion it had projected, and the company blamed delays in capacity from third-party providers and not a pullback from AI.⁠³ Hood said capital spending including finance leases would exceed $50 billion in the October to December quarter and accelerate in the first half of 2027.⁠¹⁰

The spending side of the October earnings is covered in GetCoreTech's AI Capex Scorecard, and this article covers how that spending is paid for.

Forecast The $1 trillion figure for 2027 is an analyst projection: Moody's puts it close, Bank of America above it, S&P Global Ratings above $1.3 trillion and UBS at about $1.4 trillion for total AI capex, and Jamie Dimon cited $1 trillion for hyperscalers.⁠²

Forecast S&P Global's projection, as The Motley Fool summarizes it, has Microsoft as the only one of six companies with positive 2027 free cash flow, at $33.6 billion, against negative $82.7 billion at Alphabet and negative $60.1 billion at Amazon.⁠⁶

Where sources disagree, and what they do not establish

Free cash flow figures differ by definition. Amazon's negative $42.4 billion is a trailing 12-month figure on its own definition, which nets out equipment sales and incentives, while Pati's negative $34.8 billion is the latest quarter on operating cash minus capex.⁠³⁠¹ Meta's negative $2.12 billion subtracts finance-lease principal and Pati's negative $1.2 billion does not.⁠⁴⁠¹ The company definitions are the right basis for what each reports, and Pati's uniform formula is the right basis for comparing the five.

Debt totals differ by scope. S&P Global Market Intelligence's $326 billion, Pati's $229 billion of bonds and Bloomberg's $313 billion of hyperscaler and data-center-developer bonds cover different groups and instruments.⁠³⁠¹⁠⁵ Pati excludes commercial paper and term loans and counts only the five, and Bloomberg adds developers and global sales, so this article uses Pati's figure for the five and the others as context. Meta's raise is also reported two ways: Reuters and Pati give about $35 billion launched on 26 October, while Bloomberg's coverage of the Microsoft sale says Meta raised $25 billion.⁠⁴⁠¹⁠⁵

Forecasts for 2027 run from about $1 trillion at Moody's to $1.3 trillion at S&P Global Ratings and $1.4 trillion at UBS, and the groups covered differ, with five companies, six including SpaceX, or all AI capex, so the range reflects scope as well as opinion.⁠²⁠⁶

No source links a given bond or share sale to a given data center. Microsoft and Alphabet describe proceeds as general corporate purposes including capex.⁠⁵⁠⁷ Moody's has warned that capex plans could threaten credit quality at the hyperscalers while describing the four largest balance sheets as sound for now, and none of these sources measures what returns the spending earns.⁠¹¹

Verdict: cash flow still pays most of it, for now

Opinion The buildout is still mostly paid from operating cash in aggregate, and the shortfall at four of five companies is being met with bonds, new stock and leases, with the leases the least visible.

Aggregate operating cash of $724 billion covered $691 billion of capex over the latest four quarters, yet bonds, notes and finance leases more than doubled to $642 billion and three of the five have sold stock in 2026.⁠¹ Confidence stays moderate on the totals and low on 2027, because the totals are one analyst's reading of filings and the 2027 numbers are projections.⁠¹⁠²

The fourth-quarter reports, expected in early 2027, would change this verdict. If the five companies' combined operating cash minus capex, which this article puts at positive $33 billion for the latest four quarters, turns negative, cash flow no longer covers the bill in aggregate. Meta's at-the-market program, planned for the first quarter of 2027, would show how much new equity the market takes.