Value Collector
Have courage, and be kind.
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On the details, Buffett has actually sold gross notional on the index put options (over four indices) of $32bn. Furthermore, he has undertaken CDS swaps with maximum loss of $8bn. These are not generally collateralized. To your example, it is technically possible for BRK to bankrupt because of large catastrophe losses (where retentions go into the multi-billions) mixing in with adverse movements in derivatives as above. The likelihood of that, however, is pretty darn remote. Still, it isn't zero.
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nothing is zero risk, but buffet could pay out those in cash today even at the full 100% loss, Berkshire has nearly 40 Billion reserves, not to mention that the bulk of the large ones aren't maturing till between 2017 and 2021. And for there to be a 100% loss every company in the index would have to go to zero.