When did Anthropic file for IPO?

Anthropic confidentially submitted a draft registration statement (S-1) to the U.S. Securities and Exchange Commission on June 1, 2026. The filing was disclosed publicly the same day. Anthropic's last private valuation was $965 billion, set during its Series H round in late May 2026.

When will Anthropic actually go public?

Confidential S-1 filings typically take 3-6 months to convert into a public offering. Analyst consensus points to an Anthropic IPO in Q4 2026, most likely October or November 2026. The roadshow normally starts 4-6 weeks before pricing. The 180-day lock-up after IPO would expire around April-May 2027.

What is Anthropic's revenue and valuation?

Anthropic's annualized revenue run rate reached approximately $47 billion in May 2026, up from roughly $4 billion at the start of the year. The Series H round closed at a $965 billion post-money valuation. The IPO is widely expected to price in the $900B-$1.2T range, which would make it one of the largest tech IPOs in history.

Who are the lead banks on the Anthropic IPO?

Public reporting names Morgan Stanley and Goldman Sachs as the lead bookrunners. JPMorgan, Bank of America, and Citi are also reportedly involved in the syndicate. The confidential filing means the underwriting roster could shift before the public S-1.

Quick Answer

What Is the Anthropic IPO Filing? June 1, 2026 S-1 Explained

Published: June 4, 2026

What Is the Anthropic IPO Filing? June 1, 2026 S-1 Explained

Anthropic filed a confidential S-1 with the SEC on June 1, 2026 — setting up what could be the largest AI IPO in history. At a $965 billion private valuation, it’s poised to hit Wall Street ahead of OpenAI.

Last verified: June 4, 2026

Quick facts

Item	Detail
Filing date	June 1, 2026
Filing type	Confidential draft S-1 (JOBS Act)
Last valuation	$965 billion (Series H, late May 2026)
Revenue run rate	~$47 billion (May 2026)
Lead banks	Morgan Stanley, Goldman Sachs
Expected listing	Q4 2026 (October-November estimated)
Lock-up	Standard 180 days
Major backers	Google, Amazon, Lightspeed, Spark Capital
Founders	Dario Amodei (CEO), Daniela Amodei (President)

What “confidential filing” actually means

A confidential S-1 — enabled by the JOBS Act for emerging growth companies — lets Anthropic file its draft registration statement privately with the SEC, work through review comments, then publicly flip the document at least 15 days before the roadshow. It’s now the default path for large tech IPOs (used by Slack, Airbnb, Reddit, OpenAI).

Practically:

We won’t see detailed financials until Anthropic publicly converts the filing
The company can pull the IPO without public embarrassment
Pricing terms, share count, and exchange (likely NYSE or Nasdaq) are still TBD

Why now

Anthropic’s filing comes during a unique market window:

Revenue explosion — $4B → $47B run rate in roughly 12 months
Compute crunch — Anthropic needs IPO proceeds to fund Colossus 2-class infrastructure
Beat OpenAI to market — OpenAI also filed confidentially in May 2026; first mover gets premium multiples
Public market window — Strong tech IPO appetite, ahead of potential 2027 uncertainty
Series H proceeds running out — $65B raise won’t last past 2027 at current spend

Timeline expectations

Phase	Expected window
SEC review and comments	June–August 2026
Public S-1 conversion	Late August / September 2026
Roadshow	Mid-October 2026
Pricing and trading debut	Late October / early November 2026
Quiet period ends	~25 days post-IPO
Lock-up expiration	April-May 2027

What investors should watch

Customer concentration — How much revenue comes from a handful of enterprise customers
Gross margin — Reportedly under pressure from inference costs; compare to OpenAI
Compute commitments — Multi-year reservations at AWS, Google Cloud, and SpaceX Colossus
AGI risk language — Constitutional AI and safety disclosures will be unique
Concentration of voting control — Founder share class structure

How it compares to other AI IPO candidates

Company	Status	Valuation
Anthropic	Confidential S-1 (Jun 1, 2026)	$965B
OpenAI	Confidential S-1 (May 2026)	~$852B
xAI	Private, $200B+ rumored	—
Mistral	Private, $30B rumored	—
Perplexity	Private, $20B rumored	—

Anthropic and OpenAI are racing to be first. Both are likely to price in fall/winter 2026.

Bottom line

Anthropic’s June 1 IPO filing is the single biggest moment in the public-AI-market story since the SoftBank/OpenAI deal. At $965B private and $47B run rate, this isn’t a speculative listing — it’s a profitable-trajectory growth story that will set the comp for every AI IPO behind it. Watch for the public S-1 flip in late summer for the first look at real financials.