Perhaps a law that no entity can own more than X% of a company, and outlaw hedge funds? Thinking out loud here. I wouldn't snap my finger to make it happen, but

Perhaps a law that no entity can own more than X% of a company, and outlaw hedge funds? Thinking out loud here. I wouldn't snap my finger to make it happen, but I think it's fair for the layman to questions the status quo "why do organizations exist that allow small groups of people to play the game of timing arbitrage on the market to amass billions of dollars".