IREN’s Microsoft AI deal now has debt to match

IREN secured $3.65 billion in financing to fund Microsoft-linked AI infrastructure.

IREN’s latest financing shows how AI infrastructure deals are getting funded at scale: the company raised $3.65 billion against a $9.7 billion Microsoft contract, with investment-grade ratings attached to the package.

1. The financing package

IREN raised the money through two parts: a $2.1 billion private placement and a $1.55 billion delayed draw term loan. Together, they give the company a funding base for the Nvidia GB300 GPU buildout tied to its Microsoft agreement.

The debt carries a blended cost of 6 percent before customer prepayments are counted. Fitch assigned an A rating and DBRS gave the facility A (low), which is notable for a financing secured against GPUs and contracted cash flows.

• $2.1 billion private placement
• $1.55 billion delayed draw term loan
• Secured against GPU assets and future contract revenue

2. The Microsoft contract behind it

The financing supports a previously announced $9.7 billion deal with Microsoft. Under that agreement, Microsoft gets dedicated AI cloud capacity from IREN over five years, with delivery centered on the Horizon campus in Childress, Texas.

This is more than a single customer win. It is the kind of long-dated contract that lenders can underwrite because the revenue stream is visible and the hardware is tied to a named buyer.

• Five-year term
• Dedicated Nvidia GB300 GPU capacity
• Delivery from the Horizon data centre complex

3. The Texas campus buildout

IREN says the Horizon campus will include four facilities with a combined 200MW of IT load. It sits inside the company’s broader 750MW Childress development, which makes the site one of its main AI infrastructure bets.

That scale matters because AI cloud contracts are no longer about a few racks or a single hall. They require power, land, cooling, and a financing structure that can match the build pace.

• Four planned facilities
• 200MW combined IT load
• Part of a 750MW development in Childress

4. Why the debt got investment-grade treatment

IREN says the deal is backed by both the GPUs and the cash flows from Microsoft’s contract. That combination helped it reach investment-grade status and access the US private placement market.

Co-chief executive Daniel Roberts said the company’s ownership of the data centre infrastructure improves its financing profile. In plain terms, the lender is not just betting on a contract, it is also lending against assets IREN controls.

• Collateral includes GPUs
• Contracted cash flows support repayment
• Joint lead managers: Goldman Sachs and J.P. Morgan

5. What the structure means for AI funding

The package also shows how AI infrastructure finance is changing. Operators are starting to use structures tied directly to GPU assets and customer contracts instead of relying only on standard corporate debt or project finance.

IREN says the debt, plus Microsoft customer prepayments, will cover about 96 percent of the $5.81 billion GPU capital expenditure under the contract. With prepayments included, the company puts the average funding cost at 3.31 percent.

• About 96% of GPU capex funded by debt plus prepayments
• $5.81 billion GPU capex requirement
• Average funding cost falls to 3.31% with prepayments

What to pick

If you want the financing angle, focus on the investment-grade ratings and the 6 percent blended debt cost. If you want the infrastructure angle, look at the 200MW Horizon campus and the 750MW Childress buildout. If you want the market signal, the key point is that a long-term Microsoft contract was enough to unlock a GPU-backed capital structure at this size.

For readers tracking AI data center funding, IREN is a useful case study because it combines owned infrastructure, contracted demand, and asset-backed debt in one package.