It’s a tax. So the government wouldn’t be buying anything. OpenAI (for example) would need to issue 100% new shares and give them to the government to hold in this new sovereign wealth fund. This the new sovereign wealth fund holds 50% of the company.

I don’t know how you decide what companies are targeted though. OpenAI/Anthropic are pure AI plays. But what about an AMZN or AAPL that have AI as only a part of their business.