And again, this is for publicly traded stock portfolios. Private farms won’t be broken up… yet :-)
"The proposal would impose a minimum tax of 25 percent on total income, generally inclusive of unrealized capital gains, for all taxpayers with wealth (that is, the difference obtained by subtracting liabilities from assets) greater than $100 million."
https://home.treasury.gov/system/files/131/General-Explanati...
And there are many private farms in America worth more than $100m. I have no idea what amount of that would be "unrealized capital gains", which is kinda the problem.