All registered securities (stocks, bonds,etc.) should be taxed at 75% per year. Natural persons are exempted from the tax on their first $16.7 million, with a progressive schedule up to the full tax rate at $1 billion in value.
Securities are not sold to pay the tax. A percentage of each security held by the ultra-wealthy taxpayer is transferred to the IRS. IRS liquidators sell off the shares in small lots over time, so that liquidated shares comprise no more than 1% of total traded volume.