I don't think that would be possible to deduce from public filings. I would imagine that someone has estimated it based on net worth growth, but of course, that

I don't think that would be possible to deduce from public filings. I would imagine that someone has estimated it based on net worth growth, but of course, that would assume that all of their investments are in stock only. They own an investment company as well as lots of real estate. More than likely, their growth in net worth has primarily been through appreciation and income from the business.