IREN rises after Microsoft formally approves first AI data center under $9.7 billion plan

IREN Ltd. shares surged Thursday, jumping more than 10% after Microsoft formally approved the first phase of an artificial intelligence data center program. The approval, described as “Horizon 1,” clears the first of four planned AI data centers that IREN is building under a longer-term, five-year deal valued at $9.7 billion.

The move matters because milestone approvals can determine whether construction and related spending are able to proceed as scheduled. In this case, the report says Microsoft’s acceptance of Horizon 1 is the first step in a sequence of approvals tied to the broader data center portfolio.

According to the report, the approved Horizon 1 is part of a plan for four AI data centers. The overall framework is positioned as a five-year arrangement with Microsoft, with the deal’s total value cited at $9.7 billion.

The market reaction suggests investors are watching the pace of approvals and the progress of construction-related commitments. For developers and operators in the data center ecosystem, accelerating early phases can change expectations for near-term utilization, revenue timing, and the probability of subsequent phases moving forward.

Beyond the stock move, the report underscores how large-scale AI infrastructure commitments increasingly rely on staged approvals. Instead of treating data center projects as a single binary decision, counterparties can clear work in phases, reducing risk and aligning spending with performance, design, and readiness checks.

Microsoft has not been quoted in the material provided as to specific technical details, capacity targets, or schedules beyond the notion that Horizon 1 has been formally approved. Likewise, the report does not provide project-level disclosures on build timelines, power and cooling specifications, or the commercial terms for each of the four data centers.

Industry context: the AI buildout has driven demand for specialized data center capacity, including high power delivery, efficient cooling, and flexible infrastructure that can support rapidly changing compute requirements. Deals that include multiple sites and staged acceptance are commonly used to manage construction complexity and the operational ramp associated with advanced workloads.

It remains unclear from the post how quickly Horizon 1 will move from approval to commissioning, or how much of the remaining $9.7 billion is tied to specific future approvals versus other forms of consideration. Investors may also want further disclosure on whether any milestones beyond Horizon 1 are already on track, and what contingencies could affect the remaining three data centers.