Read these primary sources
Anthropic was private through May 2026 and had no public SEC EDGAR registration of its own until the June 1, 2026 confidential draft S-1 (which is not publicly readable during the draft phase). Various third-party SPV investors have filed Form Ds for vehicles with "Anthropic" in their names (e.g. "Anthropic Fund III Feb 2026," "Anthropic MAV Secondary Fund II," "IBD Ventures Anthropic Series O"); those are not Anthropic's own filings and the underlying terms are private. The links below are the canonical primary-source set anchoring this page.
Anthropic's own news feed — funding rounds, partnerships, infrastructure
The canonical company-side source for every funding announcement, partner expansion, and the June 1, 2026 S-1 filing notice. Posts on news.anthropic.com are the load-bearing surface; the recurring refresh task walks every post since the prior cycle.
# Funding rounds
https://www.anthropic.com/news/series-h # 2026-05-28 Series H — $65B at $965B post-money
https://www.anthropic.com/news/anthropic-raises-30-billion-series-g-funding-380-billion-post-money-valuation # 2026-02-12 Series G — $30B at $380B
https://www.anthropic.com/news/anthropic-raises-series-f-at-usd183b-post-money-valuation # 2025-09 Series F — $13B at $183B
https://www.anthropic.com/news/anthropic-series-c # 2023-05 Series C — ~$450M
# IPO process
https://www.anthropic.com/news/confidential-draft-s1-sec # 2026-06-01 confidential draft S-1 (Rule 135)
# Strategic investments and compute partnerships
https://www.anthropic.com/news/anthropic-amazon-compute # 2026-04-20 Amazon up-to-5GW + $5B + up to $20B future
https://www.anthropic.com/news/google-broadcom-partnership-compute # 2026-04-06 Google + Broadcom 5GW TPU agreement
https://www.anthropic.com/news/expanding-our-use-of-google-cloud-tpus-and-services # 2025-10 TPU capacity expansion
https://www.anthropic.com/news/anthropic-invests-50-billion-in-american-ai-infrastructure # 2025-11-12 $50B US infrastructure build-out
# Governance and corporate structure
https://www.anthropic.com/news/the-long-term-benefit-trust # 2023-09-19 LTBT formation explainer
# Customer roster
https://claude.com/customers # canonical customer-stories page
Partner-side disclosures — Amazon and Google
Both Amazon and Alphabet hold equity stakes in Anthropic and disclose mark-to-fair-value treatment in their quarterly 10-Q footnotes. The aboutamazon.com news posts are the canonical partner-side source for the major investment tranches; the underlying SEC filings carry the financial mark.
# Amazon investment announcements
https://www.aboutamazon.com/news/company-news/amazon-aws-anthropic-ai # 2023-09-25 initial $1.25B (right to expand to $4B)
https://www.aboutamazon.com/news/company-news/amazon-anthropic-ai-investment # 2024-03-27 confirmed at $4B
# Amazon SEC filings — search "Anthropic" in 10-Q footnotes for the fair-value mark
https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001018724 # Amazon EDGAR filing index
# Alphabet SEC filings — same pattern
https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001652044 # Alphabet EDGAR filing index
Sibling Mungomash pages
The leadership-side mechanics of every funding round (founder cohort, board structure, LTBT trustee history, senior team additions) live on the sibling leadership page. The active and resolved litigation docket lives on the lawsuits page; the Bartz $1.5 billion settlement is the largest cap-table-relevant judicial obligation. The Claude product / version history lives on the cross-section versions page.
# Anthropic on Mungomash
/orgs/anthropic/leadership/ # founders, LTBT, funding timeline as governance events
/orgs/anthropic/lawsuits/ # Bartz settlement + active docket
/ai/claude/versions/ # product / model version history