Who owns Anthropic PBC

The disclosed stakes

One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.

Where each figure comes from

A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.

• Amazon.com, Inc., as of 30 Jun 2026. Value is the sum of the two carrying amounts Amazon discloses at 30 Jun 2026: nonvoting preferred stock of approximately $92.5bn plus convertible notes at estimated fair value of approximately $97.9bn. Amazon does not disclose share counts or an ownership percentage for Anthropic. source
• Alphabet Inc., as of 30 Jun 2026. No share count is filed anywhere. Two separately sourced inputs are combined. (1) Percentage: Alphabet has been reported at roughly 14% of Anthropic in straight equity with no voting rights, no board seat and no board observer, hard-capped at 15%. (2) Value: Alphabet's Q2 2026 10-Q reports the carrying value of non-marketable equity securities under the measurement alternative at $124,259 million as of 30 Jun 2026 and states in footnote 1 that these 'primarily consist of our investment in a private company'. The filing does not name that company. Press reporting attributes it to Anthropic. Treat $124.259bn as an upper bound on the Anthropic carrying value, not an exact one, because the line also contains other private holdings. A separate cross-check: 14% of the $350bn April 2026 valuation is about $49bn, so Alphabet's carrying value implies a materially higher mark than the April round price. sourcesource 2
• Microsoft. Microsoft's own announcement of 18 November 2025 says NVIDIA and Microsoft are committing to invest up to $10 billion and up to $5 billion respectively in Anthropic. That is a commitment ceiling, not a funded amount, and no share count, price per share or ownership percentage was published. Press coverage of the same announcement put Anthropic's valuation in the range of $350 billion, which would imply roughly 1.4 percent of Anthropic if the full $5 billion were funded at a $350 billion post-money mark, but neither the funded amount nor the pre-money versus post-money basis is disclosed, so pct_of_target is left null rather than modelled on two unverified inputs. source
• Micron Technology. Size deliberately left null. Micron and Anthropic both declined to disclose the amount, and the round is large enough ($65bn raised at $965bn post-money) that any modelled share of it would span more than an order of magnitude. No defensible input exists, so no estimate is offered. sourcesource 2