Pure-Play AI Cloud vs. Energy-Driven Infrastructure: Nebius Scale Meets IREN Limited’s Efficiency

Alex Sirois

Wed, September 9, 2026 at 10:41 AM EDT 4 min read

Quick Read

Nebius posted 454% revenue growth and a 50% EBITDA margin while IREN's $684M net loss masked AI Cloud revenue doubling sequentially.
Nebius anchors on a $27B Meta agreement while IREN's $3.4B NVIDIA contract backs its $4B contracted ARR target by December 2026.
Nebius wins on software margins and $8B cash, while IREN's owned power assets offer rare upside if Horizons 2 through 4 ship on schedule.
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Nebius Group (NASDAQ: NBIS) and IREN (NASDAQ: IREN) both just delivered results that reveal how differently two AI infrastructure builders can attack the same shortage. Nebius reported Q2 FY26 on August 12, showcasing a from-scratch cloud platform. IREN followed on August 27 with a Bitcoin miner turning its power footprint into GPU factories. Same tailwind, wildly different playbooks.

A long, dark corridor in a data center is flanked by rows of server racks on both sides. The servers glow with green and blue lights, indicating active operation. At the far end, a stylized blue graphic of a microchip with 'AI' written on it hovers in the air and is reflected upside down on the polished floor. The scene is bathed in blue light, emphasizing the technological and futuristic theme. — Shutterstock

Software Stack Lifts Nebius. Power Portfolio Lifts IREN.

Nebius booked $582.3 million in Q2 revenue, up 454% year over year, with the AI Cloud unit alone hitting $574.9 million and a 50% adjusted EBITDA margin. CEO Arkady Volozh told investors "We could sell today our entire 2027 capacity on these terms if we wanted to", a rare position for a cloud operator. Aether, Token Factory, and the Tavily acquisition, whose developer community grew to more than 2.5 million, extend Nebius beyond bare metal.

IREN posted $137.2 million in revenue, down 26.75%, as mining rigs came offline. A $450.4 million non-cash impairment drove a $684.0 million net loss. The pivot story is inside the mix: AI Cloud revenue reached $70.5 million and more than doubled sequentially. CEO Daniel Roberts framed the edge plainly: "Signing deals is not the bottleneck in this market. Bringing GPUs online is."

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Scale Versus Efficiency, Side by Side

Lens	Nebius	IREN
Core Bet	Full-stack AI cloud plus software	Owned power, land, and data centers
Contracted Backlog	$37.5B RPO	$4B contracted ARR target by Dec 2026
Power Pipeline	5GW year-end target	5GW+ pipeline
Anchor Deal	$27B Meta Platforms (NASDAQ:META) agreement	$3.4B NVIDIA (NASDAQ:NVDA) contract

Nebius is optimizing for pricing power. Its first capacity auction cleared at a price 15% above its prior high for Blackwell. IREN is optimizing for cost per megawatt. Recent three-year deals price above $20 million per MW, with active talks near $25 million, and Roberts noted "Every megawatt we build is scarce."

What Decides the Next Four Quarters

I will be watching whether Nebius can convert its $40 billion-plus in customer commitments into asset-backed financing without leaning on equity again after selling 12.7 million shares at $224. You should watch whether IREN delivers Horizons 2 through 4 to Microsoft (NASDAQ:MSFT) on schedule, since a significant portion of December-quarter capacity comes online late. Both stories hinge on execution.

Why I Lean Nebius for Now, But Keep IREN Close

Personally, I lean toward Nebius today. A 50% AI Cloud EBITDA margin, a software layer that lifts monetization, and $8 billion in cash make the scale-out feel financeable. The stock is not cheap after a 156.88% six-month run, so valuation discipline matters. IREN suits a turnaround investor comfortable with impairments and construction risk in exchange for the rarest input in the industry: energized land. If Horizons 2 through 4 ship on time and pricing holds near $25 million per MW, IREN's 20.83% six-month gain looks like the setup with room to run. Both names carry timing risk if GPU supply slips.

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