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Anthropic IPO timeline

Filing dates come from SEC EDGAR's filing list for Anthropic, PBC. Other dated events are those the S-1 itself discloses, and each is marked as such. Items still to come are limited to what the filing leaves blank or open.

By Agentic Weekly · Published · Updated · Evidence: Reported, from the filing and cited reporting; nothing here is Tested · Markdown

Not investment advice. This site summarizes public filings and cited reporting; everything is labelled Reported and nothing here is Tested. Filing status: Initial S-1; not yet effective; no amendment (S-1/A) seen. Accession 0001628280-26-067168, accepted 2026-10-26 13:00 UTC.

Dated events

Labels: Filing comes from SEC EDGAR’s filing list; Disclosed in the S-1 is a date the filing states.

  1. 2021-01 · Disclosed in the S-1: Anthropic is incorporated as a Delaware public benefit corporation. The S-1 says Anthropic was incorporated as a Delaware PBC in January 2021. (S-1, Prospectus Summary (Corporate Information))
  2. 2023-Q1 · Disclosed in the S-1: Commercial launch. The S-1 measures revenue growth from the first quarter of 2023, when it says Claude launched commercially. (S-1, Prospectus Summary)
  3. 2025-09 · Disclosed in the S-1: Bartz copyright settlement agreed. The S-1 records a $1.5 billion settlement charge in 2025; it says the district court approved the settlement in July 2026. (S-1, Risk Factors (legal proceedings))
  4. 2025-11 · Disclosed in the S-1: Microsoft compute agreement. Commitment of at least $44.9 billion between November 2026 and May 2033, later amended in February and October 2026. (S-1, Management's Discussion and Analysis (contractual obligations))
  5. 2026-03-04 · Disclosed in the S-1: U.S. Department of War sends two supply-chain-risk letters. The S-1 says the Department of War sent two letters on March 4, 2026, one under 10 U.S.C. § 3252 and one under Section 4713 of FASCSA, asserting that Anthropic's models, platform and applications present a supply-chain risk. Anthropic challenged them in court. (S-1, Risk Factors (government dispute))
  6. 2026-03 · Disclosed in the S-1: Google compute agreement. Commitment of at least approximately $114.5 billion between April 2026 and July 2033, amended May to August 2026. (S-1, Management's Discussion and Analysis (contractual obligations))
  7. 2026-04 · Disclosed in the S-1: Amazon compute agreement. Commitment of at least $110.0 billion between May 2026 and April 2036. (S-1, Management's Discussion and Analysis (contractual obligations))
  8. 2026-06-01 · Filing: Draft registration statement (form DRS) filed confidentially with the SEC. EDGAR lists a form DRS (draft registration statement) accepted at 13:11 UTC on June 1, 2026. The public S-1 followed on October 26. Reuters also reported a confidential filing in June. (EDGAR filing list, Filing list for CIK 2130357)
  9. 2026-06 · Disclosed in the S-1: U.S. Commerce Department imposes worldwide export restrictions on two models. The S-1 says that in June 2026 the Department of Commerce imposed worldwide export restrictions on the Fable 5 and Mythos 5 models, which Anthropic disabled for all customers until the restrictions were lifted. (S-1, Risk Factors (government dispute; trade controls))
  10. 2026-07-13 · Filing: Draft registration statement amendment (DRS/A) filed. EDGAR lists the first DRS/A with a filing date of July 13, 2026. (EDGAR filing list, Filing list for CIK 2130357)
  11. 2026-08-10 · Filing: Second DRS/A filed. EDGAR lists a DRS/A with a filing date of August 10, 2026. (EDGAR filing list, Filing list for CIK 2130357)
  12. 2026-08-27 · Disclosed in the S-1: N.D. Cal. largely grants summary judgment to Anthropic. The S-1 says the court ruled the challenged government actions were retaliatory acts that violated Anthropic's First Amendment and Fifth Amendment due process rights. (S-1, Risk Factors (government dispute))
  13. 2026-09-04 · Filing: Third DRS/A filed. EDGAR lists a DRS/A with a filing date of September 4, 2026. (EDGAR filing list, Filing list for CIK 2130357)
  14. 2026-09-25 · Disclosed in the S-1: D.C. Circuit denies Anthropic's petition for review, 2-1. The S-1 says the panel ruled the Department of War's Section 4713 supply-chain risk designation was proper. Anthropic filed a petition for rehearing en banc. (S-1, Risk Factors (government dispute))
  15. 2026-10-01 · Filing: Fourth DRS/A filed. EDGAR lists a DRS/A with a filing date of October 1, 2026. (EDGAR filing list, Filing list for CIK 2130357)
  16. 2026-10-09 · Filing: Fifth DRS/A filed. EDGAR lists a DRS/A with a filing date of October 9, 2026. (EDGAR filing list, Filing list for CIK 2130357)
  17. 2026-10-26 · Filing: Public Form S-1 filed; Anthropic announces proposed IPO. EDGAR shows the S-1 accepted at 13:00:11 UTC (8:00 a.m. U.S. Central) on October 26, 2026, accession 0001628280-26-067168. Anthropic's announcement the same day says it intends to list Class A common stock on the Nasdaq Global Select Market as ANT. (S-1, Cover page; EDGAR filing list)

Still to come (open in the filing)

  • Price range per share. Blank on the cover page. Anthropic's announcement says the price range has not yet been determined. Expected in a later amendment to the S-1 (an S-1/A) or the final prospectus.
  • Number of shares offered by Anthropic and by selling stockholders, and the over-allotment option. Blank on the cover page and in The Offering. The announcement says the number of shares has not yet been determined. Later amendment.
  • Net proceeds and pro forma figures. Capitalization and Use of Proceeds leave the dollar amounts and the pro forma columns blank. Later amendment, once price and share count are set.
  • Prospectus date, effectiveness, pricing and first trading day. The cover says the registration statement has been filed but is not yet effective; securities may not be sold until it is. No dates are given. Later amendment and the SEC's declaration of effectiveness.
  • Third-quarter 2026 revenue and Run-Rate Revenue as of October 31, 2026. Both are blank. The S-1 already reports customer metrics as of September 30, 2026 but not the quarter's revenue figure. Later amendment.
  • Headline total of compute commitments. The summary figure is blank (the notes give approximately $265.6 billion of fixed or minimum commitments as of June 30, 2026). Later amendment.
  • Lock-up release share counts and percentages. The release schedule exists but its share counts and percentages are blank. Later amendment.
  • Rehearing en banc in the D.C. Circuit. The S-1 says Anthropic has asked the full court to review the September 25 panel decision and that it cannot predict the outcome. Court docket; reflected in any amendment.

Sources

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