I’ll preface this by saying the 1%'s stock holdings are pretty much the last thing I’m worried about protecting. But it could be as simple as requiring your wealth to be under the limit when you file your taxes. Let’s say it’s a billion dollars (I would argue it should be much lower). If you end the year with 11 billion dollars in wealth, you owe the government 10 billion dollars. There are controls we can put in place to prevent stock manipulation, similar to the ones we have now. Just actually enforced.
I’m totally cool with rewarding people for making a bunch of money and giving it back to the people. Hell, make each prestige cooler. You find 100 billion in taxes? We’ll build you a little statue. You fund 1 trillion dollars in taxes? You get to be on a coin or some shit. Really put these greedy fucks incessant need for attention to work.