Nebius Stock: Third-Party Data Center Delays Push Revenue Guidance to the Low End as Capex Climbs to $27 Billion

Nebius investors learned this week that demand is only half the AI infrastructure story — the other half is whether capacity arrives in time to be billed. Shares fell 17% after the company guided full-year 2026 revenue to the bottom of its range and raised its capital spending plans, with broader weakness across AI stocks adding to the pressure.

The update, delivered alongside third-quarter results, exposes a timing gap in the AI build-out: strong quarterly numbers can carry a stock only as long as the next phase of expansion lands on schedule. When available capacity slips, so does the revenue timeline — and that is precisely where attention now sits.

A Strong Quarter That Needs a Sequel

Revenue for Q3 2026 came in at $980.8 million, up 571% year over year and ahead of expectations. Adjusted EBITDA reached $465.8 million, a sharp turnaround from a loss of $5.2 million in the same quarter a year earlier. The net loss from continuing operations narrowed to $37.5 million, compared with $119.6 million a year prior.

Those figures speak to the operating momentum of the business — provided Nebius can keep the performance going once additional capacity comes online. For shareholders, the distinction that matters is between a convincing completed quarter and a reliable continuation of growth. A positive adjusted operating result sitting alongside a loss on the bottom line makes the link between the two levels the relevant yardstick: how the business is developing, and how dependably the build-out converts into revenue.

The Calendar Becomes a Valuation Factor

Management pinned the guidance adjustment on delays at third-party data center sites. Some of the capacity expected this year will now only become available in the first half of 2027, according to the shareholder letter, though the contracts concerned remain in place.

The revenue range for the current year now stands at $3.0–3.2 billion, down from a previous ceiling of $3.4 billion; the lower bound was left unchanged. That sits at the bottom of the earlier $3.0–3.4 billion forecast.

On the investment side, Nebius lifted its 2026 capex guidance to roughly $27 billion, up from a prior range of $20–25 billion. For 2027, the company held out capital expenditures of $40–45 billion, with prepayments and asset-backed financing expected to cover 75%–85% of that figure.

What the 2027 Targets Require

The scale of the ambition is not in question. Nebius expects revenue of $12–13 billion in 2027 and aims to reach pre-tax break-even by the end of that year. Hitting those marks depends on whether the expansion can be executed in a way that aligns revenue development with the company's willingness to spend heavily.

That makes the deferred capacity the concrete test. The quarterly beat argues for the operating story; the capped outlook at the top end of the former range argues against an unbroken optimistic valuation. After this quarter, execution on the delayed sites — more than demand or investment intent — will decide how convincing the growth story remains.