Super-Catastrophe Insurance

Summary

A specialized form of reinsurance where Berkshire Hathaway provides coverage to primary insurers against massive, low-probability but high-severity catastrophic events (like hurricanes and earthquakes). Due to its enormous capital base, Berkshire is uniquely positioned to underwrite policies that no other entity in the world can safely assume.

Evolution & Mentions

• 1990: Buffett formally introduces "super-cat" (super-catastrophe) reinsurance. He warns of the inherent volatility: "In most years we will somewhat exceed expectations and in an occasional year we will fall far below them." He notes Berkshire concentrates this risk rather than spreading it, meaning the annual combined ratio will likely be close to either 0% or 300%. 1990 Letter

• 1992: Following Hurricane Andrew (the largest insured loss in history at the time), Buffett details the mechanics of the "super-cat" business. He introduces the manager of this operation, Ajit Jain. Buffett notes that super-cat premiums are deferred until late in the year because the majority of catastrophic events happen in the second half of the year. He warns of extreme volatility in this business: in some years it will print massive profits, and in other years it will be enormously unprofitable. He notes that calculating probabilities is difficult because environmental factors (like global warming and coastal population density) change the baseline risks over time. Famously, he remarks on the undercapitalized insurers wiped out by Andrew: "It’s only when the tide goes out that you learn who’s been swimming naked." 1992 Letter

• 1996: The Quiet Year. Buffett notes that 1996 produced an exceptional underwriting profit in the super-cat business due to a dearth of natural disasters. However, he warns shareholders that this is a "lumpy" business and they must be prepared for the inevitable multi-billion dollar catastrophe year. 1996 Letter

• 1997: Another quiet year — another round of high underwriting profit. Buffett uses the occasion to dissect and dismiss the industry's growing use of catastrophe bonds: structured instruments that pay normal coupon yields until a catastrophe triggers, at which point principal evaporates. He argues these bonds transfer catastrophic tail risk to retail investors who cannot price, bear, or diversify it — the opposite of Berkshire's approach, which is to accept the risk directly because of capital strength. The catastrophe bond is not a financial innovation; it is a misallocation of risk to the weakest hands. 1997 Letter

• 2017: The Mega-Cat Test. The 2017 hurricane season (Harvey, Irma, Maria) caused an estimated $100 billion in industry losses. Despite Berkshire taking a $3 billion hit ($2 billion after-tax), it reduced Berkshire's GAAP net worth by less than 1%. Buffett contrasted this with the rest of the industry, reiterating that Berkshire is the only company prepared for a hypothetical $400 billion "mega-catastrophe," which would put most of the property-casualty world out of business. 2017 Letter

Primary Source Quotes

"Note that we are not spreading risk as insurers typically do; we are concentrating it. Therefore, our yearly combined ratio on this business will almost never fall in the industry range of 100—120, but will instead be close to either zero or 300%." — Warren Buffett, 1990 Letter