Series H
$65B
$65B at $965B post-money · May 28, 2026
Led by Altimeter, Dragoneer, Greenoaks and Sequoia, and co-led by Capital Group, Coatue, D1, GIC, ICONIQ and XN. Includes $15B previously committed by hyperscalers, $5B of it from Amazon.
Source: Anthropic
Amazon
$13B in + $20B
Strategic investor · Apr 20, 2026
Invested $8B in earlier rounds, $5B in April 2026, and committed up to $20B more. Per the S-1, $6.2B of convertible notes were outstanding, $15B is available under the 2026 agreement, and Amazon's stake is capped at 12%.
Source: Anthropic
Google
Up to $20B
Strategic investor
Earlier notes have converted to non-voting preferred stock. The 2026 agreement makes up to $20B available, plus an option to buy up to $10B of stock alongside the IPO.
Source: S-1 prospectus
Microsoft & NVIDIA
Up to $15B
Strategic investors · Nov 18, 2025
NVIDIA committed up to $10B and Microsoft up to $5B, alongside Anthropic's $30B Azure compute commitment.
Source: Anthropic
AMD
Up to $5B
Strategic investor · Jul 22, 2026
Will buy up to $5B of Class N shares in stages as GPU delivery milestones are met. The first milestone is expected in 2027.
Source: CNBC
Broadcom financing
Up to $42B
Infrastructure notes
Up to $42B of convertible notes, usable only for rent on leased infrastructure. None were outstanding as of June 30, 2026.
Source: S-1 prospectus
Spark Capital
≈$440M in H-1
Venture investor
Has invested in every preferred round from Series C-1 through H-1, including about $440M in Series H-1. Partner Yasmin Razavi sits on the board.
Source: S-1 prospectus
April 2026 tender offer
$4.66B
Secondary sale
A stockholder group bought 179.9M Class A shares at $25.91 each. Sellers included Dario and Daniela Amodei and Krishna Rao.
Source: S-1 prospectus