The stories I see, like https://www.cnbc.com/2021/10/25/senate-democrats-push-for-billionaire-tax-to-help-fund-spending-plan.html https://www.cnbc.com/2021/10/2

The stories I see, like https://www.cnbc.com/2021/10/25/senate-democrats-push-for-billionaire-tax-to-help-fund-spending-plan.html https://www.cnbc.com/2021/10/25/senate-democrats-push-for-bi..., says the tax on unrealized gains only applies to "tradeable assets." It doesn't seem like that would cover private companies. From what that article says, it would invoke an increased tax due to the deferral of taxes though.