Key points
- Three customers are 54% of Nvidia's revenue. Lucent's largest was 15% before it collapsed.
- Lucent booked its customer loans as revenue. Nvidia's guarantee is contingent and reimbursable.
- Investors cut the OpenAI commitment from $250B to $105B in three weeks.
Lucent Technologies comes up often in comparisons with the current AI infrastructure boom, but the analogy is usually framed too broadly. Lucent certainly became a cautionary tale about vendor financing. The mechanism that caused the real damage, though, was more specific. That distinction matters when comparing Lucent with Nvidia's guarantee of an OpenAI data center lease in Ohio, which was signed on Aug. 17.
Begin with the cleanest comparison. Nvidia's (NVDA) quarterly filing says three direct customers supplied 21 percent, 17 percent and 16 percent of revenue during the quarter ended April 26. The company did not identify them. Lucent disclosed only one customer at 10 percent or more of revenue. AT&T accounted for 15 percent in fiscal 1998, 14 percent in fiscal 1999 and 10 percent in fiscal 2000.
The same disclosure a year earlier listed two direct customers, at 16 percent and 14 percent. So the share of revenue coming from Nvidia's largest direct customers went from 30 percent to 54 percent in twelve months. Nvidia states the position plainly in the filing: "Our revenue is concentrated among a limited number of direct and indirect customers and this trend may continue."
How Lucent financed its customers
During the late 1990s, telecom equipment vendors routinely offered customers the money needed to buy their products. Lucent's annual report for fiscal 2000 put its commitments to extend credit to customers at about $6.7 billion, of which $1.3 billion had been advanced and was outstanding at Sept. 30, 2000. It had separately committed to guarantee up to about $1.4 billion of customer debt, with $770 million of that outstanding. The two commitments together come to $8.1 billion, against revenue of $33.8 billion that year.
Many of the recipients were startup carriers that conventional banks had already rejected. Nortel Networks ran a comparable program. In his account of the industry's decline, Robert Atkinson puts the amount Nortel extended at $1.4 billion and notes it sometimes offered financing equal to 130 percent of the equipment price.
The aftermath was severe. Lucent's revenue peaked at $33.8 billion in fiscal 2000, then fell to $12 billion by 2002 and $8.8 billion by 2006. The company lost $16.1 billion in 2001 and another $7 billion in 2002, while employment dropped more than 80 percent from its high. Nortel's market value followed a similar path, plunging from $136 billion in 2000 to $14 billion two years later.
The part that mattered
A guarantee does not destroy a company. What destroyed Lucent was that the loan and the sale were the same transaction. It lent a carrier money, the carrier bought switches with it, and Lucent recognized that purchase as revenue in the period it occurred. Growth on the income statement was partly Lucent's own capital coming back around, and when the carriers failed, the receivable and the revenue went together.
Nvidia's arrangement does not work that way. Its aggregate payment obligation is capped at $105 billion under a set of residual value guarantees, covering leases for about 4.25 gigawatts of IT load, with about 3.8 gigawatts more available at Nvidia's sole discretion. Nvidia describes its support as "limited to defined portions of lease and power payments, along with a specified residual-value commitment," not the full cost of the site.
Payment turns on what the filing defines as a Trigger Event, meaning OpenAI's insolvency causing a lease default or OpenAI failing to make lease payments. Nvidia then owes "an amount generally equal to any shortfall between the guaranteed minimum value of a lease and amounts recovered through a replacement lease or sale." It can assume the lease, force a re-letting, start a sale, let the lease terminate, or defer for a year. Its obligations end early if OpenAI achieves a satisfactory credit rating. And OpenAI has agreed to reimburse and indemnify Nvidia for any amount Nvidia actually pays.
Nothing there is booked as revenue today. It is an off-balance-sheet contingent obligation that ranks behind two other remedies and carries an indemnity. Lucent's was money it had already handed over.
Where the Nvidia comparison looks worse
Two measures do not favor Nvidia, and customer concentration is the sharper of them because it compares the same thing on both sides.
| Lucent, fiscal 2000 | Nvidia, quarter to April 2026 | |
|---|---|---|
| Largest single customer | AT&T, 10 percent (15 percent in fiscal 1998) | 21 percent |
| Customers at 10 percent or more | one | three, 54 percent combined |
| Revenue | $33.8 billion | $253.4 billion, twelve months to April |
| Financing committed | $8.1 billion | $105 billion cap, contingent |
| Actually out the door | about $2.1 billion | none yet |
| Commitment as share of revenue | 24 percent | 41 percent, but contingent |
Nvidia's revenue for the twelve months through April was $253.4 billion, adding the $46.7 billion, $57.0 billion and $68.1 billion it reported in the last three quarters of fiscal 2026 to $81.6 billion for the quarter ended April 26. It guided to $91.0 billion for the following quarter.
The exposure ratio is the weaker of the two comparisons, because a capped contingent obligation and money already lent are not the same instrument. The concentration figure carries no such caveat.
The number moved before it was signed
Bloomberg reported on July 27 that the two companies were discussing a backstop of up to $250 billion across a 10 gigawatt buildout. The Wall Street Journal reported on Aug. 14 that the figure had fallen below $120 billion and would cover only the first phase, and attributed the reduction to investor concern about Nvidia's exposure. The filing three days later capped it at $105 billion.
Lucent expanded its lending as its customers deteriorated, because its own share price had become tied to their survival. Nvidia's commitment fell 58 percent in three weeks because its shareholders objected in public.
Nvidia retains discretion over about 3.8 gigawatts more at the same site. That decision, and whether the terms tighten or loosen when it is made, is the next reading on the same question. We track it alongside the other measures on the AI bubble indicator.
Sources
- NVIDIA Corporation, Form 8-K (August 17, 2026): the residual value guarantees, the $105 billion cap, the 4.25 gigawatts covered and 3.8 gigawatts discretionary, the Trigger Event definition and remedies, the OpenAI indemnity, and the credit-rating termination.
- NVIDIA Corporation, Form 10-Q for the quarter ended April 26, 2026: the three direct customers at 21, 17 and 16 percent of total revenue, the two customers at 16 and 14 percent a year earlier, and the quoted concentration statement.
- NVIDIA, first quarter fiscal 2027 results (May 2026) and fourth quarter and fiscal 2026 results (February 25, 2026): the quarterly revenue figures behind the twelve-month total.
- The Wall Street Journal (August 14, 2026) and Bloomberg (July 27, 2026): the reduction below $120 billion, the attribution to investor concern, and the original $250 billion talks.
- Lucent Technologies, annual report on Form 10-K for the fiscal year ended September 30, 2000: the $6.7 billion of commitments to extend credit and $1.3 billion outstanding, the $1.4 billion of debt guarantees and $770 million outstanding, total revenues of $33,813 million, and AT&T at 10, 14 and 15 percent of consolidated revenues in fiscal 2000, 1999 and 1998.
- Robert D. Atkinson, "Who Lost Lucent? The Decline of America's Telecom Equipment Industry" (American Affairs, August 2020): the amount Nortel extended, the 130 percent financing offers, Lucent's later revenue decline and losses, and Nortel's valuation.
This is general market commentary, not investment advice.
