A catastrophe bond lets an insurer pass disaster risk to investors.

You lend money and earn a high rate, as long as no named disaster strikes.

If the disaster hits, you can lose your money to pay the claims.

The cat bond market set records in 2025, topping $20 billion in new issuance for the first time.

The outstanding market grew to more than $60 billion.

Insurers turned to investors as disaster costs climbed.

New sponsors entered at a record pace.

Investors were drawn by high yields that public bonds could not match.

An insurer sets up a bond tied to a specific risk, like a Florida hurricane.

Investors buy the bond and their cash sits in a safe, separate account.

They earn interest plus a rich premium for taking the disaster risk.

If no qualifying disaster happens, they get their money back with interest.

If one does, the cash is used to pay the insurer's claims, and investors take the loss.

The trigger is defined in advance, by storm size or dollar losses.

The first stress point is the disaster itself. A big enough event can wipe out the principal.

The second is climate. Rising storm and fire losses can make triggers hit more often.

The third is model risk. The odds are set by models that can misjudge a changing climate.

A mispriced model means investors are paid too little for the real risk.

Cat bonds spread disaster risk widely and keep insurers funded after big events, which is valuable.

Their returns have little to do with stocks or bonds, a real diversification benefit that deserves credit.

What can break is a year of severe disasters, or models that underprice a warming world.

You can watch the market. Specialist trackers report issuance, yields, and losses.

Rising yields signal investors demanding more to take the risk.

A catastrophe bond pays you to stand behind an insurer, until disaster strikes.

It is a genuine diversifier, but its safety rests on models of a changing climate.

The next test is a major disaster season. Watch cat bond yields and any triggered losses.