Unfortunately for Warren, we also know one of his personal holdings was SRG (Seritage) common stock. He was still willing to do a secured first mortgage on all of their property at the Berkshire level, despite the potential conflict. He may have sold his SRG common before Berkshire made that loan. Seritage has been dutifully paying it off and the loan is almost finished. It was always well secured by 1st position mortgage on the real estate. Seritage issues a press release every time they mail Berkshire a principal repayment check.

He has said publicly that his 2010 adjusted gross income was around $62 million and his 2015 return showed $11.5m adjusted gross income. I think his non-Berkshire net worth has been between $600m and $850m for many, many years and he had many private investments not associated with Berkshire. The 2013 Annual Letter described a property investment in real estate adjacent to NYU, in partnership with Larry Silverstein and his friend Fred Rose.

Earlier in life he "subscribed" to quite a few annual reports by buying 100 shares each in companies he wanted to follow. With many decades of splits and the American tailwind you could imagine those "subscribe to the annual report mailing list" shares could be worth a good amount.

I suspect most of his $750m or so of liquid folding cash is probably in T-bills these days - it isn't worth the conflict.

Does anybody remember if Mid-Continent Tab Card Co. was a personal investment for him?
kingswell.io - Before berkshire warren buffetts