Nebius Group’s $4.5B Convertible Fuels AI Cap-Ex Push

Nebius Group N.V. (NASDAQ: NBIS) on Aug. 19, 2026 unveiled a proposed private offering of $4.50 billion of convertible senior notes, split into a 2030 and a 2034 tranche, to bankroll the next leg of its AI data center buildout. With a 13-day initial-purchaser option to buy an extra $675 million, the deal can size up to $5.175 billion — one of the largest single-issuer convertible prints of the year and the latest sign that AI infrastructure companies are increasingly turning to the convertible market to fund a spending cycle that outruns operating cash flow.

Shares of NBIS traded down roughly 7.6% intraday to $248.43, giving the company a market cap of about $63 billion, per Yahoo Finance. The move reflects the familiar convertible-launch dynamic: hedge-fund initial purchasers short common stock to delta-hedge, and long-only holders reprice for potential dilution before pricing terms are set.

Deal structure: two tranches, one aim

The offering is being marketed to qualified institutional buyers under Rule 144A. Interest rate, initial conversion rate and accretion schedule will be set at pricing. Nebius also disclosed it may separately negotiate exchanges of its existing 2029 and 2031 convertible notes with select holders — a common tactic to reset maturity walls while a company is already in the market.

Notably absent from the announcement: any mention of capped-call transactions. Capped calls are the standard hedging bolt-on used by convertible issuers (from MicroStrategy to Airbnb) to synthetically raise the effective conversion price and blunt shareholder dilution. If Nebius adds a capped-call at pricing, the effective break-even for existing holders improves; if it doesn’t, the delta the market is discounting today stands.

Why now: cap-ex is running six times cash generation

The offering follows Nebius’s Q2 2026 report (Aug. 12), which showed revenue up 454% year over year to $582.3 million, adjusted EBITDA of $236.2 million and — critically — cash spent on property, equipment and intangibles of $5.66 billion in the quarter alone. First-half capex reached $8.13 billion. That’s the arithmetic behind the raise: even with $8.04 billion of cash on the balance sheet at June 30, a business consuming north of $5 billion of hardware and shell capacity per quarter cannot self-fund at anything close to its stated ambitions.

Nebius has been stacking financing sources at a fast clip. On July 17 it closed its first secured debt financing — a $775 million senior secured term loan maturing Oct. 31, 2030, priced at SOFR + 2.50%, backed by deployed GPUs and contracted cash flows from an investment-grade customer. MUFG structured the deal, with lead arrangers including Bank of America, Deutsche Bank, HSBC, Citi, Morgan Stanley and Goldman Sachs. Management flagged the facility was “significantly oversubscribed” and covered more than 100% of the underlying GPU capex — a stamp of approval that likely helped underwriters approach the unsecured convertible market five weeks later.

The AI-infra convert wave

Nebius is not alone. Its neocloud peer CoreWeave (NASDAQ: CRWV) has raised more than $30 billion in debt and equity year-to-date in 2026, per the company’s Aug. 10 filing accompanying the $2.6 billion DDTL 5.5 facility. That tally includes “over $10 billion” in unsecured and convertible debt, plus a $1 billion strategic investment from Jane Street disclosed with Q2 earnings. CoreWeave’s $104 billion contracted revenue backlog is the collateral thesis. Nebius, coming off Q2 customer commitments the company has described as exceeding $40 billion, is following the same playbook — just at slightly earlier innings.

Why convertibles for AI infra specifically

Convertibles let a fast-growing, cash-burning issuer trade a lower coupon today for potential dilution later — an appealing swap when the equity is up sharply and management believes the operating story will grow into the strike. For hedge-fund buyers running convertible arbitrage, the structure offers a long-volatility, credit-plus-equity payoff that fits the volatile trading pattern of AI infrastructure names. The result is a dependable bid at scale, even when investment-grade bond desks are pushing back on primary supply (as they did earlier this month, when investment-grade order books shed roughly 36% of interest during a record week of issuance).

What to watch at pricing

• Coupon spread between the 2030 and 2034 tranches. A tight spread (say, 25 basis points) signals the credit market views Nebius’s four-year and eight-year risk as broadly similar; a wider spread implies more skepticism about longer-dated AI infra economics.
• Conversion premium. Recent AI-name converts have priced in the 27–35% area over spot. A print at the low end of that range would indicate the book required a sweetener to clear; the high end would signal strong demand and less near-term dilution risk.
• Capped-call take-up. If Nebius adds a capped call at pricing (typical size: 25–50% of principal), effective strike moves higher and headline dilution shrinks. Its absence in the announcement leaves this open.
• Exchange participation. How much of the outstanding 2029 and 2031 converts get exchanged is a live variable — a heavy exchange would extend the maturity profile and simplify the cap structure, but adds trading-desk hedging flow that can pressure the stock at print.

Sources

• Nebius Group announces proposed private offering of $4.50B convertible senior notes (Aug. 19, 2026)
• Nebius reports second quarter 2026 financial results (Aug. 12, 2026)
• Nebius raises $775M in first secured debt financing (Jul. 17, 2026)
• CoreWeave closes $2.6B loan facility (Aug. 10, 2026)
• Yahoo Finance — NBIS quote and news
• SEC — Rule 144A (Securities Act)

Disclosure: This article is for informational purposes only and is not investment advice.