14 Details in Anthropic’s Prospectus Most Worth Reading

Author: Long Yue

On October 26, Anthropic formally filed its IPO application with the U.S. Securities and Exchange Commission, seeking a Nasdaq listing under the ticker symbol ANT, with a target valuation of $1.5 trillion to $2 trillion, potentially surpassing the historical record set by SpaceX. According to media reports, the IPO timing window is scheduled for the week of November 16.

On the same day, the U.S. semiconductor sector rallied sharply—the Nasdaq climbed over 1% intraday, while Broadcom, AMD, and Nvidia each surged nearly 3%. Even before Anthropic hits the market, its suppliers are already rallying. Anthropic has signed compute contracts totaling over $800 billion, extending as far out as 2045. In the eyes of the market, these long-term agreements may already represent certainty on hardware giants' balance sheets.

This S-1 filing, spanning over 300 pages and approximately 240,000 English words, gives the public their first opportunity to fully scrutinize the financial fundamentals and governance logic of this world-class AI lab. The UK's Financial Times characterized it as a "referendum"—a test of how much public market investors actually buy into Dario Amodei's narrative of winning over private investors through mission-driven leadership. Judging from current market reactions, Amodei's pitch seems to be landing well.

Beyond the narrative, the financial data and details within the prospectus are equally striking.

On the revenue front, Anthropic generated $376 million in Q1 2025, surging to $11.555 billion in this year's Q2—a roughly 30x increase over five quarters. Regarding profits, it reported a net loss of $80.7 billion in the first half of the year, yet Q2 operating profit turned positive at $974 million. This divergence primarily stems from a fair value change of approximately $72.4 billion, which involved no cash outflow. In terms of control, Amazon and Google hold non-voting Class N shares, while 50.1% of the company's voting power rests in a single Class F share, subscribed to by seven co-founders with an investment of $1 each.

Meanwhile, Anthropic's revenue growth rate decelerated to nearly 50% between Q2 and Q3, with the top five clients accounting for a quarter of revenue across the first nine months. Among the more than 90 pages of risk factors in the prospectus, the company warns that its technology could pose "catastrophic or existential risks."

I. Insane Revenue Growth

How staggering is the growth? Anthropic provides a direct comparison in its own S-1.

The prospectus shows that in 2023, Anthropic achieved $41 million in revenue, which grew to $386 million in 2024, and further reached $4.585 billion in 2025. Momentum accelerated in 2026, with the company posting $16.286 billion in H1. Quarterly breakdowns show $376 million in Q1 2025; $11.555 billion in this year's Q2—a roughly 30x jump over five quarters. The intermediate four quarters sequentially recorded $787 million, $1.382 billion, $2.04 billion, and $4.731 billion. Put simply, Q2 saw daily inflows averaging around $127 million.

For the first nine months this year, media reports indicate Anthropic's revenue jumped from $4.6 billion last year to over $33 billion for this period, translating to roughly $6.6 million in revenue per employee over the past year.

Sales and marketing expenses spiked in tandem: $568 million for full-year 2025, reaching $3.168 billion in H1 alone.

However, the growth rate is already decelerating. Revenue more than doubled from Q1 to Q2 this year, but the increase slowed to nearly 50% from Q2 to Q3. Anthropic cautions in the prospectus that the rapid expansion so far "may reflect early adoption," and future growth could stall.

II. $80.7 Billion Half-Year Loss, $72.4 Billion of It Paper-Based

The H1 net loss of $80.748 billion looks alarming, but breaking down the income statement, $72.388 billion stems from fair value changes in convertible notes, derivative liabilities, and SAFEs.

The mechanism is straightforward. A portion of the capital Amazon invested in Anthropic came in the form of convertible notes, akin to IOUs stating they can be converted into stock at a predetermined price later. With Anthropic's valuation jumping from $380 billion in February to $965 billion in May this year, these notes appreciated significantly. Under accounting standards, this appreciation must be recorded as a company loss. The prospectus also notes that these fluctuations are primarily driven by valuation increases and involve no cash outflow.

Under the company's adjusted (non-GAAP) metrics, H1 adjusted operating profit stood at $1.618 billion, largely excluding equity-based compensation and non-cash charitable donations; adjusted net profit was $2.671 billion

III. Compute Cost as a Share of Revenue: Dropping from $2.50 to Under 50 Cents

According to the Financial Times, in Q1 2025, Anthropic spent over $2.50 on compute and infrastructure for every $1 of revenue; by Q2 2026, that figure dropped to under 50 cents.

Year-over-year figures from the prospectus show compute spending exceeded revenue by over 10 times in 2023, stood at 653% in 2024, 160% in 2025, and 55% in H1 2026.

Profits subsequently turned positive. For the three months ended June 30, Anthropic posted an operating margin of 8% and operating profit of $1 billion, compared to a $1.2 billion loss in the same period last year. Specifically, Q2 operating profit was $974 million; adding back non-cash items like equity compensation brought adjusted operating profit to $2.235 billion, yielding a 19% margin. H1 operating cash flow saw a net inflow of $3.9 billion.

The prospectus outlines four reasons:

Improved training efficiency. Claude is increasingly used in the R&D of next-generation models, internally dubbed "closing the loop";

Enhanced inference efficiency, reducing the compute required for equivalent capabilities;

Training and running models across four chip categories—Amazon Trainium, Google TPUs, Nvidia GPUs, and AMD GPUs—while building its own scheduling system;

Price cuts on new models. Following the November 2025 launch of Opus 4.5, prices and per-task costs declined, driving Q1 2026 revenue growth to accelerate from 48% in the prior quarter to 132% quarter-over-quarter; the September launch of Opus 5.5 and Fable 5.1 cut per-task costs further by 25% to 45%.

The company simultaneously warns that results may experience "significant periodic volatility" due to compute expenditures.

IV. Client Structure: Five Clients Account for a Quarter, but Concentration Is Declining

Over the first nine months this year, five clients accounted for 25% of Anthropic's revenue, with only 250 clients spending over $10 million annually.

Quarterly trends show top-client concentration is falling. The revenue share of the top five clients dropped from roughly 36% in Q1 to about 21% in Q3, meaning 79% of Q3 revenue came from outside the top five, with no single client exceeding 10%. Despite this, absolute revenue from the top five rose from roughly $1.7 billion to $3.5 billion over the same period. The prospectus also indicates that roughly 48% of revenue comes through cloud service provider marketplace channels.

Client base expansion: Clients spending over $100,000 annually numbered roughly 20 at the end of 2023, ~950 by September 2025, and surpassed 11,900 by September 2026, alongside approximately 40 million clients spending under $100,000. Among Fortune 500 companies, over half have become annual spenders above $100,000, yet their average expenditure on Anthropic remains below 0.1% of total IT budgets, with even the top 10 users accounting for less than 1%.

Net revenue retention stands at roughly 900%, meaning clients who spent $1 a year ago now average $9 in the same period. This figure excludes subscription users.

By revenue type, usage-based billing totaled $3.8 billion (83%) in 2025 and $13.1 billion (80%) in H1 2026; subscription revenue hit $3.2 billion in H1 vs. $180 million last year. Over 80% of Q3 revenue came from model versions released within the previous six months.

V. 5% to 7% of Revenue Comes from Clients Later Deemed Non-Compliant

The prospectus discloses that for the nine months ended September 30, roughly 5% to 7% of Anthropic's revenue originated from clients later determined to have violated usage policies or commercial terms. This gap exists because there is a lag between discovery, investigation, and account suspension; revenue is recognized as usual for services delivered prior to the ban.

The company simultaneously notes that enforcement and bans intensified in August and September, which will likely reduce this revenue share and could weigh on future revenue and growth rates. Based roughly on the ~$33 billion revenue for the first nine months, the 5% to 7% slice translates to roughly $1.6 billion to $2.3 billion.

VI. Compute Commitments: Totaling Over $800 Billion, Extending to 2045

Anthropic labels compute as a "critical input," having secured commitments totaling over $800 billion that extend as far out as 2045. Founders acknowledge these investments "might appear reckless at first glance," characterizing their approach as "bold but prudent."

Key contracts include:

Broadcom: Jointly developing TPUs with Google and leasing them to Anthropic under a five-year lease totaling $161 billion; starting in 2028, Anthropic expects to spend up to an additional $150 billion on TPUs;

AMD: Anticipated spend exceeds $20 billion, with options to roughly double the scale; AMD will invest up to $5 billion in Anthropic tied to chip deliveries;

Google, Amazon, Microsoft: Will provide at least $269.4 billion in cloud compute over the next decade;

Nscale, Lambda: Contract values reaching up to $86 billion.

The tenure for the three cloud giants varies: Google at least $114.5 billion from April 2026 to July 2033; Amazon at least $110 billion through April 2036; Microsoft at least $44.9 billion through May 2033. All three contracts include "regardless of actual usage" payment clauses, with Google and Amazon specifically requiring shortfalls to be covered if usage falls below contracted volumes. These "take-or-pay" terms are common in long-term energy contracts like natural gas and electricity.

Summarized per the notes to the financial statements in the prospectus: As of June 30, fixed or guaranteed procurement commitments stand at $265.6 billion, signed but undrawn data center and compute leases total $321.4 billion, and long-term contracts signed or revised after June 30 amount to $245 billion, bringing the total to over $830 billion. As of June 30, the company held approximately $131.6 billion in cash and short-term investments, with roughly $110.4 billion raised in H1 through Series G and H rounds.

The mismatch in pacing between costs and revenue is also a key investor focus. The prospectus reveals that roughly 80% of revenue settles based on actual usage, depending on client call volume, whereas compute costs are typically locked in over a year in advance.

VII. $3.1 Billion Monthly Payments to Musk

The contract between Anthropic and SpaceX totals up to $120.5 billion, extending through 2029. Once compute capacity goes fully online in December, monthly fees will reach approximately $3.1 billion; starting early next year, either party may terminate with 90 days' notice.

Looking back at the relationship, there have been plenty of twists. In January, Anthropic revoked xAI employees' access to Claude via Cursor. In February, following Anthropic's financing announcement, Musk publicly criticized its AI. In May, Anthropic announced it would lease xAI's Colossus 1 data center in Memphis; Musk quickly pivoted his tune, praising Anthropic's talent for being capable and focused on doing the right thing. The contracting entity in the prospectus is SpaceX.AI LLC, formerly X.AI LLC, now a wholly-owned subsidiary of SpaceX.

Per SpaceX's filings, its entire AI division generated $818 million in revenue in Q1 this year. Anthropic's monthly compute bill is roughly four times that figure.

VIII. Amazon Holds Nearly One-Fifth, Google Stakes About 7%

The Financial Times calculates that assuming a $2 trillion post-IPO valuation, Amazon would hold roughly one-fifth of Anthropic once all convertible notes convert, valued at around $400 billion. Its ownership cap is set at 12%; amounts exceeding this remain as notes and convert gradually as cap room opens, though Amazon may waive this ceiling.

Google holds roughly 7%, and may commit up to an additional $20 billion under earlier agreements, of which $10 billion can be taken at the offering price; if both parties agree, Google can also serve as a cornerstone investor in the IPO.

Among financial investors, filings show Spark Capital invested under $1 billion, holding stakes worth $14.5 billion; according to a knowledgeable source, Coatue invested $4.75 billion, maintaining a comparable position.

Lock-up arrangements are also unusual. Similar to SpaceX, Anthropic will schedule five release dates within 76 days post-listing, allowing non-founder directors, executives, and certain current and former employees to sell portions of their shares on day one. Early investors typically face standard 180-day post-IPO lock-ups.

For employees, simulations in the prospectus assuming a June 30 closing estimate total incentive expenses at roughly $29.7 billion. Averaged across approximately 5,300 employees, that equates to at least $5.6 million per person. In an internal secondary share transfer in April, insider shareholders including the Amodei siblings and the CFO already cashed out $4.66 billion.

IX. Seven Co-Founders Hold 50.1% of Voting Power

Anthropic acknowledges in its prospectus that its "novel" governance structure "differs significantly" from most listed companies, granting common shareholders almost no control over corporate decisions.

Outlined by the media, the governance architecture places a "Long-Term Benefit Trust" (LTBT) at the apex, whose members self-appoint and generally hold the power to elect and remove four of the seven board directors. The Amodei siblings cannot be replaced by the trust. The remaining three directors are nominally elected by shareholders but effectively decided by the siblings and five other co-founders, who control 50.1% of voting rights through a special class of shares. The trust's oversight of the fourth seat requires consent from the nomination committee, which includes Daniela Amodei; tiebreakers fall to an employee representative vote.

Details of this special share class reveal that pre-listing, the company will issue a single Class F share to the Founder LLC, comprising the seven co-founders. This share carries zero economic rights but holds 50.1% of all voting power, including electing all directors except T-class representatives.

Conversely, Class N shares held by major shareholders like Amazon and Google carry no voting rights. The prospectus also states the company qualifies as a "controlled company" under Nasdaq rules, allowing exemptions from certain corporate governance requirements.

X. Up to 2% Equity Pledged for Philanthropy with Every 50% Stock Surge

Prior to listing, Anthropic allocated 846,840,960 Class N shares to a wholly-owned subsidiary, the Anthropic Charitable Fund, representing 5% of the fully diluted share count.

The board additionally approved a framework: starting from the IPO offering price, each subsequent 50% increase in stock price relative to the prior milestone will trigger a potential injection of up to 2% of shares into the fund. Each of the seven co-founders has pledged to dedicate 80% of their personal equity to charitable causes.

XI. Over 90 Pages of Risk Factors: Insurance Industry Can't Cover Them Either

The risk factor section in the prospectus spans roughly three times the length of SpaceX's comparable disclosures, diverging sharply from boilerplate corporate warnings. The filing cautions that its technology could pose "catastrophic or existential risks" to humanity and might "provide substantial assistance to bad actors intending to develop chemical, biological, or other dangerous weapons."

Documented failure scenarios include models potentially exhibiting "unexpected... self-preservation behaviors" in the future, such as attempting to resist shutdowns or conceal/manipulate information, as well as generating coercive, deceptive outputs akin to "ransomware." Regarding insurance backing for these risks, the prospectus bluntly states that no single insurer, nor the entire insurance industry collectively, may possess the capacity to underwrite them.

Risks also note that the company's increasing use of AI to accelerate its own R&D could cause model capabilities to outpace the development and implementation of safety measures; Anthropic has previously delayed releases for this reason, citing the limited beta launch of Mythos via Project Glasswing.

On the policy front, the filing acknowledges that the U.S. government may raise costs, restrict operations, or introduce new regulations impacting model demand. Earlier this year, Anthropic was flagged by the U.S. Department of Defense as a "supply chain risk," with government agency contract revenue comprising roughly 1% of the company's total. The section concludes: "Many of the risks we face are interconnected and may compound or trigger cascading adverse effects."

XII. Advice from the Founders

In the filing, the seven founders urge potential investors not to "view your purchase purely from a transactional standpoint," while admitting the company's decisions "may run counter to investor expectations" because maximizing profits must be balanced against the "public interest," leading some commercial bets to "appear strange or unconventional when viewed in isolation." Media outlets note the founding team emphasizes that retaining key roles in executive leadership is "uncommon," framing it as a "subtle dig" at OpenAI, which has already lost the majority of its original founding team.

XIII. Ticker ANT: Employees Call Themselves "Ants"

The prospectus describes the corporate culture as "low-ego." Leaked accounts reveal Anthropic employees internally refer to themselves as "Ants," mirroring the IPO ticker.

XIV. What the Market Looks At Next: October ARR

The prospectus defines Run-Rate Revenue as: charges billed on a usage basis over the most recent 28 days multiplied by 13, plus monthly subscription fees multiplied by 12. The October column remains blank in the filing, expected to be filled when the S-1 is updated mid-next week. In market discussions, an ARR above $730 billion is considered a reasonable benchmark; if it surpasses $780 billion, speculation about hitting $1 trillion by December will heat up again.

Matt Kennedy, Senior Strategist at Renaissance Capital (focusing on IPO research), told Reuters that no company wishes to linger indefinitely at this critical pre-IPO juncture. While waiting until next year might yield a higher valuation, they decided to "strike while the iron is hot."