AI needs more than clever software. It needs giant buildings packed with servers, and those buildings cost serious money.
Nebius Group, an Amsterdam company that runs AI cloud services, is raising $4.5 billion to build more of them. It rents out computing power to companies that build and run AI models.
The company announced the offering on Wednesday, August 19, and the money will go toward data center construction and AI cloud development.
The deal comes in two parts.
Convertible bonds are a loan with a twist. Investors can swap them for company stock later, so if the share price climbs, they get to ride along.
Companies like them because they can borrow at a lower interest rate than a regular bond.
The interest rates tell you how the market is thinking. The 2030 bonds carry an interest rate, or coupon, between 0% and 0.5%, which is almost nothing.
The 2034 bonds pay between 4% and 4.5%, which is closer to a normal bond.
This is not Nebius's first big raise this year. Earlier in 2026, it secured roughly $4.3 billion through an upsized convertible bond offering tied to Meta Platforms. Upsized means the company sold more bonds than it first planned.
Nebius's business depends on renting computing power to AI companies, so its expansion plans are tied to the same demand driving data center construction across the industry. The near-zero interest on the 2030 bonds signals that investors are more focused on conversion than on income.
Here is the odd part. Nebius stock had a monster year, up 197% through Tuesday's close.
Then the company announced this raise, and the stock slid up to 9.2% before US markets opened on Wednesday.
The reason is dilution. Convertible bonds can turn into new shares, and when they do, existing shareholders own a thinner slice of the company.
The market often prices that in right away, which is why a growth announcement can still send a stock down. It is a trade-off: the company gets cash to grow, and investors get a chance to own a piece of that growth.
They want the option to convert if the stock keeps climbing.
Goldman Sachs, JPMorgan Chase, Citigroup, and Bank of America are managing the offering, with pricing expected later Wednesday. Spokespeople for Goldman, Citigroup, and Bank of America gave no comment, while Nebius and JPMorgan did not respond.
If you own Nebius stock, dilution is the number to watch. Every convertible bond is a potential claim on future shares, and after a 197% run, a lot of good news is already in the price.
Dilution does not mean the company is in trouble. But it does mean the pie is getting more slices, and each slice is worth a little less. That is the trade-off the stock market was weighing on Wednesday.
If you do not own the stock, this is still a useful window into the AI boom. Companies are pouring billions into physical infrastructure, and that money flows through to builders, chipmakers, and power providers.
The real question for investors is whether the AI buildout can keep up with the hype. Nebius is betting billions that it will.
The stock market, at least for one Wednesday morning, decided to wait and see.