For decades, advisors have relied on the classic 60/40 portfolio. The basic premise was that a blended portfolio represented by a 60% allocation to stocks and 40% to bonds would balance investor portfolios, minimize correlation risk and ultimately improve investor returns over time. It has remained a reliable formula since the early-to-mid 1900s, thanks to academic research suggesting that when stock prices fall, bonds prices should typically go up (or would at least not fall) and cushion the overall impact on a diversified portfolio’s performance. However, over the past few decades, this low-correlation relationship between stocks and bonds has become a lot less predictable, forcing investors to take a look at new, alternative portfolio allocations in an effort to balance return and risk.
There are some excellent recent examples of diversification failing investors. In 2022, inflation hit multi-decade highs, prompting the Federal Reserve to aggressively raise interest rates. Both equities and U.S. Treasuries sold off, meaning that these corresponding, correlating drawdowns impacted “diversified” portfolios hard. A similar, perhaps smaller situation played out just last year as tariff announcements were made in April 2025. The 10-year Treasury yield jumped about 57 basis points in a single week, while stocks, as represented by the S&P 500, also slid.
Since 2018, there have been six S&P 500 drawdowns of 10%, and Treasury yields rose (bond prices fell) during three of them. It’s no wonder that many articles, blogs, thought pieces, and interviews have been done decrying the death of the 60/40 portfolio during the 2000s.
Alternative credit likely isn't the escape hatch it appears to be
To boost yields and lower interest rate risk, many investors move into high-yield bonds, leveraged loans, and private credit investments. The catch is that these investments are ultimately still bets on borrowers paying their debts, and borrowers struggle when the economy struggles.
There are clear examples of times when these assets did not support portfolio diversification. During the 2007-08 Financial Crisis, for example, leveraged loans and high-yield bonds fell roughly 27-31% (peak-to-trough). Once again, during the Covid 19-related selloff in early 2020, both indexes dropped in the 13-14% range when equities sold off as well.
Private credit generally appears to have more price stability on paper, partly because it isn't priced daily, and while these strategies can also add some overall portfolio diversification and boost returns, they can still stumble at the same moments stocks do, and often come with less transparency.
Perhaps somewhat counter-intuitively, the addition of entirely new risk factors into a portfolio, instead of the addition of new types of exposures to assets with shared risk factors, is a key benefit to adding an allocation to catastrophe bonds. More distinct risk factors mean lower correlations. Ultimately, since catastrophe bonds introduce a unique risk factor tied to randomly occurring weather-related events, adding an allocation to them into a diversified portfolio that already includes stocks, bonds, and private credit can continue to further improve its overall risk profile.
What does this have to do with catastrophe bonds?
Catastrophe bonds’ risks and returns are ultimately linked to randomly-occurring natural disaster events, which is precisely what can make them an attractive diversifier for the so-called traditional 60/40 portfolios. Two key reasons why:
How CAT bonds held up when it counted
The real test of a diversifying asset is how it behaves in periods of crisis or times when “correlations go to one.”
In 2008 (when we just mentioned that leveraged loans and high-yield bonds fell roughly ~27-31% at their worst), the Swiss Re Global Cat Bond Index gained 2.45%. In 2020, as the COVID crash brought the S&P 500 down 34%, it was up 5.81%. In 2018, a year with two S&P 500 sell-offs of about 12% and 20%, the Swiss Re Global Cat Bond Index returned 2.81%, and in 2022 - when stocks fell 27% and Treasuries dropped alongside them - the index slipped just 2.15%.
In each of these periods, when stocks, bonds, and credit stumbled, cat bonds remained unaffected - because their returns are not dependent on them, nor are cat bonds impacted by this type of macro event or market or economic sensitivity. In fact, the Swiss Re Global Cat Bond Index was positive in 23 of 24 years from 2002-2025. Its one losing year (2022, -2.15%) can be attributed to losses driven by Hurricane Ian, an actual weather-related catastrophe, rather than any market sell-off. These bonds are built to carry risk from a completely different place, event-driven occurrences, which show up on their own schedule.
Of course, cat bonds are not without any risk at all. A single catastrophe has the potential to wipe out a bond’s principal, and risk models aren’t always accurate, especially when climate changes are harder to predict. However, within a diversified portfolio, cat bonds have the potential to add stability thanks to the fact that they exist largely outside of market pressures.
The takeaway
Cat bonds aren't meant to replace stocks or bonds in a 60/40 or otherwise blended portfolio, but rather complement and offset risks thanks to the fact that they have a completely unique risk factor. For investors worried that "safe" assets now move with risky ones with increasing frequency, cat bonds might be a compelling addition to their investment mix.
Sources:
King Ridge Capital Advisors
Bloomberg
Brookmont Capital Management