Nebius Group N.V. (NASDAQ: NBIS) announced a private offering of convertible senior notes to raise $4.5 billion in a move that is a further sign of expansion of AI infrastructure services, data centres and computing capacity and AI cloud services.
The proposed offering is composed of two series of convertible senior notes: $2.75 billion of notes due in 2030 and $1.75 billion of notes due in 2034. Nebius also hopes to offer the initial buyers the option of purchasing an additional $375 million of 2030 notes and $300 million of 2034 notes.
The new fundraising plan highlights the enormous amount of capital companies operating in the rapidly expanding artificial-intelligence infrastructure industry need.
Nebius will use the proceeds primarily for future business expansion, including the construction and expansion of data centres, the development of its full-stack AI cloud platform, expansion of its global data-centre footprint and procurement of critical components such as GPUs. A portion of the proceeds will also be used for general corporate purposes, the company said in a statement.
Convertible senior notes are corporate debt that can be converted into the company’s shares. This structure allows a company to raise a significant amount of capital and in general allow investors to participate in future share-price appreciation.
The notes will be senior, unsecured obligations of Nebius and will pay interest semi-annually. Investors will have conversion rights under specific circumstances where Nebius can settle conversions using cash, Class A ordinary shares or a combination of the two, and will have the rights to do so provided the rights take place.
The proposed fundraising is particularly significant because Nebius has already held billions in convertible debt earlier in the year. In March 2026, the company priced a $4 billion convertible senior notes offering, consisting of $2.25 billion of notes due in 2031 and $1.75 billion due in 2033.
That earlier offering brought in around $4.3 billion in gross proceeds, illustrating the scale of investor financing available to companies focused in the AI infrastructure boom.
The new $4.5 billion proposal is therefore another major capital commitment to Nebius’ growth strategy.
The company’s spending plans emphasize the capital-intensive nature of AI. Building AI data centres takes huge amounts of investment in servers, GPUs, networking equipment, electricity infrastructure and advanced cooling systems. As demand for AI computing continues to rise, companies like Nebius are competing to secure enough infrastructure capacity.
Nebius is an AI infrastructure company, which provides an entire-stack cloud platform for developers and businesses. As a result the expansion strategy is to increase computing capacity and support customers developing AI products, agents and services.
The financing announcement also could have an impact on NBIS shareholders. Since convertible notes can eventually be converted into ordinary shares, investors typically monitor the potential for future share dilution. But the actual impact depends on the conversion terms, the company's share price and if conversion conditions are met.
At the same time, issuing convertible debt helps Nebius to fund expansion without immediately issuing a similar amount of common stock. But a startup that is growing with high numbers of employees and has a strong growth target, it can be attractive to invest in infrastructure ahead of the market demand.
The company expects to enter into separately negotiated exchange agreements with some holders of the existing 2029 and 2031 convertible notes. Some existing notes may be exchanged for Nebius Class A shares under those deals.
For investors the new announcement is a reminder of some of Nebius’ ambitions in the AI space. This means that the company is betting that demand for AI computing will continue to grow quickly enough to justify investing so much money in data-centre capacity and GPU infrastructure.
The announcement would also affect the stock market's view of NBIS. Nebius shares fell more than 6% in pre-market trading after news of the $4.5 billion deal was announced by Nebius after news about the $4.5 billion offering and the investor mindsets are nervous about a big convertible-debt deal.
But the capital raise can also be viewed as a growth investment rather than just an increase in financial obligation. If Nebius can convert the additional infrastructure into revenue-generating AI capacity, the investment can improve its position in the fast-growing AI-cloud space.
The question for investors now will be that future revenue and cash flow growth can justify the scale of capital expenditure and debt financing.
Nebius is also taking a $4.5 billion approach and making clear that it intends to remain aggressive in the global AI infrastructure race. The company is looking for more data centres, more computing capacity and more GPUs at a time when AI companies are scrambling to get the hardware to train and deploy these ever-more powerful models.
The recent financing announcement is thus a massive step for Nebius and the AI infrastructure space in general. Investors will continue to watch that NBIS shares go down and dilution but the company is ready for another big step up.
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