Private company
Who owns OpenAI Group PBC
2 companies in the researched set disclose a stake in OpenAI Group PBC, worth $28.7bn between them. OpenAI Group PBC is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
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. Carrying value on the balance sheet at 30 Jun 2026, held at cost with adjustments for observable price changes. No upward remeasurement had been taken on the OpenAI position at that date, so carrying value equals cash deployed. source
- Microsoft, as of 30 Jun 2026. Microsoft discloses no share count and no separate carrying value for the OpenAI position. It discloses total funding commitments of $13.0 billion related to the investment, of which $11.9 billion was funded as of 30 June 2026, and total equity method investments across all investees of $12.0 billion at 30 June 2026 (up from $6.0 billion at 30 June 2025). The OpenAI carrying value is therefore bounded above by $12.0 billion but is not separately stated, so value_usd is left null rather than guessed. sourcesource 2
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of OpenAI Group PBC where a holder stated one, and are missing where no holder did.