Investors & ownership

Who backs OpenAI

OpenAI's cap table pairs strategic technology partners with a deep bench of top-tier funds, all under a nonprofit-controlled PBC structure. The strategic backers matter most for investors, since they are the closest public proxies.

Strategic investors

These also serve as the most direct public-market proxies for OpenAI exposure.

Microsoft

MSFT

Largest backer and primary cloud partner via Azure ($250B commitment); holds roughly a 27% stake.

NVIDIA

NVDA

$30B equity investment paired with a separate purchase of its systems for OpenAI compute.

Amazon

AMZN

$50B strategic partnership ($15B now, $35B conditional) plus a $38B, seven-year AWS compute agreement.

See live proxy charts →

Financial investors

A selection of the funds participating in recent rounds, including the $122B March 2026 round.