A one-day rally did not fix CoreWeave's math, where adjusted operating income covers 0.45x of interest

Nebius and IREN carry gaps of their own. CoreWeave's 24.71% jump on 11 Nov and its intraday slide on 12 Nov did not close any of them.

The rally hid three different financing tests. They were CoreWeave's debt service, Nebius's uncovered construction funding and IREN's reliance on market-dependent capital. CoreWeave's adjusted operating income of $379 million covered 0.45x of its $846 million quarterly interest.

CoreWeave beat and raised on 10 Nov. CNBC reported a 24.71% jump on 11 Nov. On 12 Nov, CNBC's live page had CoreWeave down almost 8% and Nebius down about 17% intraday. Closing prices were not available at publication, so the net move is unknown.

One test: does operations pay the bill?

On CTOL's arithmetic, using third-quarter figures in $ million:

• CoreWeave: operating cash flow of 1,975 against property and equipment purchases of 9,441, so operations covered 21% of the build. Adjusted EBITDA of 2,256 exceeded interest of 846.
• Nebius: operating cash flow of minus 273.0 against capex of 7,300.4. Operations funded none of the build.
• IREN: adjusted EBITDA of 66 against finance expense of 73, or 0.9x. The filings give no IREN quarterly capex or operating cash flow here.

None of the three funds its build from operations. CoreWeave's EBITDA clears interest but its adjusted operating income does not. The test cannot show which will win, which markets will fund or at what price.

Where each gap sits

CoreWeave's 10-Q shows $47.5 billion of total indebtedness. Fourth-quarter interest is guided to $1.05 billion to $1.15 billion, up from $846 million, or 2.9x third-quarter adjusted operating income at the midpoint.

Nebius raised 2026 capex to $27 billion and put revenue at the low end of its range. It expects the remaining Microsoft capacity in New Jersey in the second quarter of 2027, after DataOne began retiring temporary generation. Its CEO letter says prepayments and financing should cover 75-85% of 2027 capex of $40 billion to $45 billion. That leaves $6 billion to $11.25 billion.

IREN plans $15 billion of remaining fiscal 2027 capex. It says $6 billion depends on sources "subject to market conditions". Its more-than-$4 billion revenue run-rate target is now aimed at January 2027 with extension to February possible. A miss is an unproven risk to that $6 billion.

CoreWeave's best case

Chief executive Michael Intrator expects about $9 billion of customer prepayments and deposits in the next three months. That compares in size with the $9,441 million spent last quarter; coverage is unconfirmed. Its $4.2 billion of 2033 convertible notes carry a 3% effective rate, and a new asset-level debt offering is expected at 7%-7.5%. Intrator calls asset-level debt "rock solid".

Cheaper money helps finish construction. Returns after interest and equipment replacement are a separate question.

Global Crossing: customer cash did not finish the build

Global Crossing sold capacity before it was lit. Its FY2000 10-K shows $1.7 billion of deferred revenue and estimated 2001 capex of $4.9 billion to $5.1 billion. It still needed outside financing and filed for chapter 11 on 28 Jan 2002. Its FY2002 10-K records $6.589 billion of debt classified as current at the end of 2001.

Like Global Crossing, GPU clouds can collect customer cash before delivering capacity and still need capital markets to finish. It breaks in three places. Fibre lasts longer, while Nebius's payback method assumes five-year GPU depreciation. Global Crossing's filing cites an oversupply of subsea capacity; CTOL has seen no equivalent evidence for GPUs. Global Crossing booked $728 million of 1999 revenue up front, whereas CoreWeave's $132.5 billion backlog is remaining performance obligations plus other committed amounts.

Judge the next rally by CoreWeave's interest coverage, Nebius's contracted share of capex financing and IREN's market-dependent $6 billion.