Nebius Wobbles as $4.3 Billion Debt Deal Meets a $1.4 Billion Software Ambition

Nebius shares see wild volatility as the AI infrastructure firm pursues a $1.4B AI21 Labs acquisition, a $10B Finnish megaproject, and a $4.34B convertible bond offering.

The market took a bite out of Nebius Group on Monday, sending shares on a wild intraday ride that saw the stock swing more than 14% before settling. The Dutch AI infrastructure provider hit a high above $165 before plunging to around $146, with trading volumes far exceeding the daily average. By Friday's close, the stock had shed 6.3% to land at $147.16 — a modest pullback in the context of a 659% surge from its 52-week low of $20.25.

The volatility comes at a pivotal moment. Nebius is juggling a $4.34 billion convertible bond offering, a $10 billion Finnish megaproject, and now reports that it is in talks to acquire AI21 Labs, an Israeli startup valued at $1.4 billion. The company's market capitalization stands at roughly $37 billion, supported by a price-to-earnings multiple of 366 — a valuation that leaves little room for error.

A Software Bet to Change the Narrative

Nebius has built its reputation on renting out graphics processing units to AI developers, but the potential acquisition of AI21 Labs signals a strategic pivot toward higher-margin software. The startup employs around 200 researchers and generates an estimated $50 million in annual revenue through its Maestro platform, which manages AI agents and large language models. Nvidia walked away from talks to buy the company for $2 billion to $3 billion last year, but Nebius sees a different fit.

The deal would extend a pattern established earlier this year, when Nebius acquired Israeli startup Tavily for up to $400 million to bolster its agent infrastructure. AI21 Labs would bring proprietary language models that could run directly on Nebius data centers, converting raw GPU capacity into platform revenue. The challenge: AI21 Labs has yet to achieve broad market adoption, leaving it to compete against the likes of Amazon, Microsoft, and Google.

A $20 Billion Construction Bill

The acquisition talks come during a week of extraordinary capital deployment. Alongside the convertible bond closing, Nebius announced plans for a 310-megawatt AI factory in Lappeenranta, Finland — a project with a total investment of roughly $10 billion that would become Europe's largest dedicated AI facility when it comes online in 2027. The plant will run on low-carbon energy, use a closed-loop liquid cooling system, and channel excess server heat into the local district heating network.

That's just one piece of a global build-out. Nebius has secured approval for a massive data center in Missouri and is pushing toward a contracted capacity of more than three gigawatts by the end of 2026. Capital expenditures for the year are forecast at $16 billion to $20 billion, a figure that could climb further if the AI21 Labs deal goes through.

The Revenue Hurdle

Management is betting that this infrastructure offensive will translate into explosive revenue growth. The company targets an annualized revenue run rate of $7 billion to $9 billion by the end of 2026, up from roughly $1.25 billion at the end of 2025. For the full year 2026, Nebius forecasts $3.0 billion to $3.4 billion in revenue with an adjusted EBITDA margin of around 40%.

Those numbers represent a massive leap, and the first real test arrives on April 29, when Nebius reports first-quarter 2026 results. The report will provide the first hard data point of the year — and the first evidence of whether the company's expensive infrastructure bets are already showing up in measurable revenue growth. Analysts remain broadly optimistic, with a consensus price target of $163, but the gap between ambition and execution has rarely been wider.