Anthropic Tells Investors to Expect an IPO as Big as SpaceX's — or Bigger

Five years after Dario Amodei and a handful of OpenAI defectors founded Anthropic PBC to build AI safely, the company is preparing for the largest stock market debut in history. According to a Bloomberg report published August 20, Anthropic has told investors it expects to match — or beat — the size of SpaceX’s record-setting initial public offering when it lists as soon as October.

The bravado is not baseless. SpaceX set the all-time IPO record in June 2026, pricing at $135 a share to raise $75 billion and closing its first trading day near a $2.1 trillion market cap. Anthropic, which raised $65 billion in private funding in May at a $965 billion valuation, believes its own public debut can reach the same scale. Several investors told the Financial Times they expect the Claude developer to seek a valuation of $2 trillion — some even whispered $3 trillion — for an October listing.

The numbers behind the confidence

Anthropic’s trajectory has been steep even by AI-sector standards. The company’s annualized revenue run rate climbed from roughly $9 billion at the end of 2025 to over $44–47 billion by May 2026 — a five-fold increase in five months, driven overwhelmingly by enterprise demand for the Claude model family and its coding-oriented subscriptions.

Reuters reported on August 15 that the IPO valuation now hinges on aggressive internal forecasts: Anthropic has told underwriters it expects $190–200 billion in revenue by 2028, with projected revenue of at least $10.9 billion for the second quarter of 2026 alone — more than double the previous quarter. Investors cited by the FT expect the run rate to reach $100–120 billion by the time the listing prices.

The competitive framing matters too. Anthropic’s $965 billion May valuation surpassed rival OpenAI’s $852 billion mark from March, making it the most valuable private AI company in the world — at least until its competitor’s next round. A successful IPO would hand Wall Street its first clean, daily-marked price for a frontier AI lab, and would likely arrive ahead of OpenAI’s own widely-reported 2027 listing timeline.

Why SpaceX set the bar — and why it’s a warning

The SpaceX comparison cuts both ways. The June IPO was a liquidity event unlike anything the market had seen: $75 billion raised, a first-day pop toward $2.1 trillion, and overwhelming retail demand. But the afterparty has been rougher. After its first earnings report as a public company repriced the AI-satellite-adjacency trade, SpaceX has fallen to roughly $1.4 trillion — a decline of about a third from its debut peak.

That drawdown is precisely the cautionary tale hanging over Anthropic’s ambitions. Private valuations in AI have been marked almost exclusively by insider-led rounds with attached guarantees; public markets mark positions daily and without sentiment. Forbes noted that Anthropic’s debut will “test private valuations against real markets” — if a company going public at $2 trillion must then grow into a $190 billion revenue forecast on schedule, any wobble in enterprise AI spending gets punished immediately and visibly.

There are also structural questions unique to Anthropic. Its largest investor is Google; its foundational partnership and compute arrangements are entangled with Amazon and Google Cloud; and its public-benefit-corporation charter commits it to safety governance that public shareholders may or may not prize once growth slows. The prospectus filing — reportedly confidential since June — will have to reconcile those threads for institutional buyers.

The IPO window everyone is racing through

Anthropic’s listing is the bellwether of a broader rush to public markets. Newly listed companies had already raised $160.6 billion through August 19, trailing only 2021’s record pace, with the average 2026 US IPO lifting $86.2 billion on the back of AI-driven demand. OpenAI is reportedly preparing its own offering for 2027, and a queue of AI infrastructure and chip companies is forming behind the two giants.

For the broader industry, the stakes are straightforward. If Anthropic prices at or near $2 trillion and holds its gains, the private AI valuation complex — from foundation-model labs to GPU-cloud startups — receives a fresh vote of confidence and a public comparable to anchor against. If it repeats SpaceX’s post-debut slide, the correction will not stay contained to one ticker; it will cascade into every late-stage AI round being negotiated this autumn.

An October listing would also land amid macro noise: enterprise AI budgets are still expanding but scrutinized, circular vendor-financing concerns have surfaced around hyperscaler capex, and analysts are increasingly asking what portion of AI revenue is durable versus discounted. Anthropic’s answer — that Claude’s enterprise stickiness justifies a $2 trillion price on $47 billion of run-rate revenue, roughly 42 times sales — is the most aggressive valuation argument the market has been asked to accept in a generation.

Whether investors buy it will define the final chapter of the AI funding boom, or its first great repricing.