Anthropic's $42 Billion Loss Is a Gain Google and Amazon Already Banked

Anthropic lost $42 billion last year on $4.6 billion of revenue, one of the worst annual losses any American company has booked, and almost none of it was spending ¹². The leaked filing shows↗ the real burn: an $8.06 billion operating loss, up from $2.98 billion in 2024 ¹. The rest, roughly $34 billion, is an accounting charge for financing whose value rose, not cash spent ¹.

The loss is the good news

The instrument at the center is a convertible note. Alphabet's Google put in $2 billion that way in 2023; Amazon added $8 billion in late 2024 at a $46 billion valuation ². Aim those promises at a listing above $2 trillion, more than double May's $965 billion estimate, and GAAP books the windfall as a loss ¹.

"The loss is a consequence of good news," wrote Joshua Ronen, an accounting professor at NYU Stern ². The attribution is largely, not entirely: Forbes reports it is not clear whether the charge also covers noteholders beyond the two backers ².

The mirror marks are already public

The same mark-up sits inside two mega-cap income statements. Amazon's second-quarter net income leapt to $62.6 billion from $18.2 billion↗ on a $53.4 billion mark-up of its Anthropic stake, which carried "other" income from $1.1 billion to that level, two-thirds of pre-tax profit ²³. Alphabet booked just over $99 billion of equity gains, "primarily related to unrealized gains" on SpaceX and one unnamed private company, and holds $124.3 billion of startup investments it says are largely one company ²⁴.

Court filings reported in March 2025 put Google at 14% of Anthropic; Amazon holds more than a fifth ²³. If the debut prints under those marks, the markdown lands in the quarter it prints.

The round trip runs through the same names

Anthropic has promised $518 billion over seven to 10 years↗, about 80% non-cancelable or payable regardless of usage, against $20.28 billion of cash and $7.33 billion of actual compute spending last year ¹⁶⁷. Google is owed $111.1 billion and Amazon $110 billion ⁷, and the same two collect the bills on nearly half of Anthropic's sales, up from 11% in 2023 ⁸.

Broadcom tops both with $161.2 billion of equipment leases, plus up to $42 billion of loans convertible into equity↗: the same instrument that produced the loss, now offered by a supplier counting Anthropic as its largest chip-design customer next year ⁵⁶⁷. "Non-cancelable is only as strong as the balance sheet behind the signature," said Stephen Sopko of HyperFrame Research ⁶.

The filing's defense concedes the dependence

The filing sells the partner web as "market penetration at a scale we believe would be difficult for any single organization to directly replicate," while warning the same reliance "could give rise to conflicts of interest and adversely affect our access to compute" ⁸. It also concedes the platforms see Anthropic's pricing, which could shape their compute allocation and how hard they sell Claude ⁸.

OpenAI says booking marketplace sales gross inflates revenue by billions; Anthropic answers that it is the "principal" in the transaction ⁸. The $47 billion May run-rate is company-claimed ³, and nearly a quarter of 2025 revenue came from two customers ¹. Robert Leitao of Rothschild & Co sees "quite a concentrated bet" on two companies carrying the financing ⁵.

What the next two prints decide

GAAP re-marks the stake every quarter, so Amazon's and Alphabet's September-quarter reports will re-price the position before any IPO share trades ³⁴. Alphabet's line already shows the violence available in both directions: SpaceX went from $171 in June to under $109 in July, back near $147 by late September ¹⁴.

The decision is two-part: underwrite or skip the offering, and read those prints as a mark-to-IPO on the same position. A debut is expected after the November midterms, with reports pointing as early as mid-November ¹⁷. The record loss and the windfall are the same entry, read from opposite sides of the balance sheet.