It's a little more complicated than that. OpenAI's core business is a non-profit, and nobody has shares in it that generate any kind of returns. Any extra money they make is either reinvested, donated to another non-profit, or just sits in a bank account until they do one of the first two things.

There is a for-profit arm of it, though, and some people do have shares in that.

The board in question runs the non-profit part.