They have a very creative investment structure but they do own a stake in OpenAI. It’s just sounds more like a commercial agreement the way it was laid out, which primarily has to do with OAIs organizational structure

If the deal is still based around capped revenue, I wouldn't call it an ownership stake.

As far as I know, they have not disclosed it. If you have more information about something concrete regarding ownership, I'd love to hear it. Maybe I haven't understood everything that was stated.

In the end, whatever Microsoft has is probably less valuable than a sizable ownership chunk that most people seem to assume.

I imagine a lot of people are investing in Microsoft as a proxy to OpenAI. Those people are set to be disappointed.