On August 20, Nebius Group (NASDAQ:NBIS) confirmed what had already rattled its stock a day earlier: a $5 billion convertible bond offering that ranks among the largest in recent corporate history. The company increased the deal from an initial $4.5 billion late Wednesday, and the total could still grow to $5.75 billion if buyers exercise every option attached. Nebius says the sheer size of the raise is proof of how much demand exists for its AI computing capacity. The stock's reaction, a sharp drop over two sessions, tells a more complicated story.

Bull Case: Betting On Insatiable Demand

Nebius chief communications officer Tom Blackwell summed up the pitch bluntly: "We know that everything we build, we can sell several times over." That is not just talk. Nebius sells AI computing power to customers that include Meta and Microsoft, and its results back the claim that the shortage is real rather than temporary. Second quarter sales surged 454% year over year to $582 million (a 5.5-fold increase), topping analyst estimates as the company continued expanding its data center footprint throughout the year.

Wall Street expects the pace to keep climbing, with forecasts calling for 446% revenue growth in the third quarter and 526% in the fourth. Nvidia, whose GPUs power Nebius's data centers, holds a roughly 9.3% stake in the company, a sign of confidence from the chipmaker sitting at the center of the AI buildout. All of that has fueled one of the market's wildest rides this year. Nebius shares have climbed more than 220% year to date and jumped over 40% in just the past few weeks, largely on the strength of that second quarter report. Investors betting on Nebius right now are underwriting the growth story first and worrying about the bottom line later.

The Cost Of Growing Fast

The dilution math is what actually moved the stock. Alongside the convertible note offering on Wednesday, Nebius disclosed a deal to swap $800 million of previously issued convertible notes for 15.8 million new shares, diluting existing holders by roughly 5.5%. Layered onto the size of the new offering, that news sent shares down as much as 14% intraday on Wednesday before they closed down 10.03% at $223.51, with trading volume swelling to 48.8 million shares, about 129% above its three-month average of 21.3 million. Shares extended the slide into Thursday, falling another 1.7% to $220.10. This is Nebius's third capital raise this year, and its total convertible debt now stands around $12 billion.