IREN's AI Revenue Finally Passed Bitcoin — A $450M Write-Off Bought the Crossover, and the Stock Fell 6% Anyway

IREN reported its fiscal fourth quarter after the close on August 27 with a headline it has been working toward for a year: AI cloud revenue of $70.5 million, the first quarter in which it exceeded bitcoin mining revenue. The market answered with a 6.3% decline, closing at $37.97. Same report, two readings. The gap between them is the company.

The crossover is worth taking apart before taking at face value. In the June quarter, AI cloud revenue of $70.5 million topped bitcoin mining's $66.7 million for the first time. But look at how that happened. AI cloud revenue roughly doubled from $33.6 million in the March quarter, while mining revenue fell from $111.2 million. The inflection was manufactured on both sides: GPUs came online just as IREN decommissioned miners to make room for them. And that decommissioning is the source of the quarter's headline damage — a $684 million net loss, of which $450.4 million was a non-cash impairment tied to retiring bitcoin mining hardware as sites convert to AI cloud. For the full year, those write-offs totaled $638.8 million, dragging FY26 to a $702.6 million net loss against net income of $86.9 million a year earlier.

"Non-cash" deserves a translation, because it reads like an accounting trick and is not. No cash left the building. But the impairment is real: IREN paid to install mining machines, and when it pulls them out early to make way for GPUs, accounting requires it to recognize that the machines' remaining book value will never be recovered. The write-off is the pivot's bill — the realized cost of turning a bitcoin mining site into an AI data center. The market is right not to treat it as operating damage; it is also right to notice it will keep appearing every quarter IREN retires another fleet.

Stripping out the write-offs does not make the quarter comforting. Adjusted EBITDA fell to $19.2 million from $59.5 million in the March quarter, on roughly flat revenue, as employee costs and platform spending rose ahead of the AI cloud ramp. This is the tension that matters: the segment that pays the bills today — mining — is being deliberately shut off faster than the segment that is supposed to replace it is turning on at scale. Full-year adjusted EBITDA was $245.7 million on $707.0 million of revenue, but the run-rate at the end of the year is far below that average. Revenue itself was roughly in line with the ~$136–139 million Wall Street had modeled; the clean miss was the bottom line, which came in near a $1.90-per-share loss against consensus around $0.45.

The funding side is where the story's real economics sit, and it explains why the market is pricing what it prices. IREN's buildout has not been paid for by earnings — FY26 free cash flow was roughly negative $2.3 billion on operating cash flow of about $2.1 billion against $4.5 billion of capital expenditure. The company issued $4.7 billion of ordinary shares and $6.3 billion of convertible notes during the fiscal year, including $2.1 billion of shares in the June quarter alone, plus more than $1.6 billion to settle convertible conversions. Shares outstanding rose 52.7% year over year to 357.4 million. A good chunk of the positive-looking operating cash flow is actual customer money — $1.8 billion sits on the balance sheet as deferred revenue, prepaid for capacity not yet delivered.

That prepayment number is the bridge between IREN's two ARR figures, and it is the difference between what investors are now asking for. The company reports $1 billion of operating ARR as of August 26 against $4 billion of contracted ARR for 2026 capacity. Operating ARR is revenue actually being earned today; contracted ARR is what customers have signed up to pay once the infrastructure exists. The gap — roughly three-quarters of the booked business — must be converted gigawatt by gigawatt. IREN operated about 40 megawatts of AI cloud capacity as of June 30 and targets cumulative delivery of roughly 0.8 gigawatts in fiscal 2027. The distance between those two numbers is what the stock is really trading.

None of this is a bear case by itself. The contracted demand is enormous and diversified — a Microsoft contract that was $1.9 billion of contracted ARR in May, an air-cooled Blackwell deal with NVIDIA, a new multi-year contract with a frontier AI lab, and signings including Perplexity and Cohere — with pricing reportedly rising above $20 million of annual revenue per megawatt. The financing structure covers 90% of GPU capex for the newest customer deployments, including a $2.4 billion facility at a 9.0% fixed rate, and customer prepayments cover the rest. At a market value around $14 billion against $4 billion of contracted ARR, the bull case is that investors are buying booked revenue at a fraction of what comparable AI infrastructure has traded for.

The risk case is the mirror image: every one of those contracts is a repayment obligation, not just an earnings promise. If delivery slips, the prepayments are money owed back. The 9% financing on the non-investment-grade customer deals leaves IREN carrying counterparty risk — if the customer cannot pay, IREN owns the GPUs and the debt. And the share count does not stop growing while the buildout does.

For a reader deciding whether this belongs on a watch list, the milestone is not the point. The point is the rate at which $1 billion of operating ARR moves toward $4 billion. That shows up in four quarterly observables: megawatts delivered (Microsoft's remaining Horizons, Mackenzie, Canal Flats), adjusted EBITDA recovering above its FY26 average, the deferred-revenue balance converting into recognized revenue rather than refunds, and the share-count line flattening. The quarter that made IREN officially more AI company than bitcoin miner also made clear how much it still has to build to earn the contracts it has signed — and the stock's 6% drop was the market's first installment on that bill.