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🔗 '''Index-linked security''' is a financial instrument whose returns or principal repayment are tied to the performance of a specified index, and within the insurance sector the term most commonly describes [[Definition:Insurance-linked security (ILS) | insurance-linked securities]] such as [[Definition:Catastrophe bond | catastrophe bonds]] that use industry-loss or parametric indices to determine investor payouts. These instruments allow [[Definition:Insurance carrier | insurers]] and [[Definition:Reinsurer | reinsurers]] to transfer [[Definition:Peak peril | peak catastrophe risk]] to [[Definition:Capital markets | capital-market]] investors, whose returns depend on whether an index — such as aggregate insured losses from a hurricane season — breaches a contractual threshold.

⚙️ In a typical transaction, a [[Definition:Cedent | cedent]] establishes a [[Definition:Special purpose vehicle (SPV) | special purpose vehicle]] that issues notes to investors. The proceeds are held in a collateral trust and invested in high-quality securities. Investors receive a coupon — usually [[Definition:SOFR | SOFR]] or a similar benchmark plus a risk spread — as long as the referenced index stays below the trigger level. If the index is breached following a qualifying [[Definition:Catastrophe | catastrophe event]], some or all of the collateral is released to the cedent, and investors lose a corresponding portion of their principal. Because the payout hinges on an [[Definition:Index trigger | index trigger]] rather than the cedent's actual reported losses, the mechanism offers transparency and speed, though it introduces [[Definition:Basis risk | basis risk]] that must be carefully modeled.

📐 For the insurance industry, index-linked securities serve as a vital complement to traditional [[Definition:Reinsurance | reinsurance]], adding capacity during hard-market cycles and diversifying the sources of risk capital. Pension funds, hedge funds, and other institutional investors are drawn to these instruments because catastrophe risk has historically shown low correlation with broader financial markets, offering genuine [[Definition:Diversification | portfolio diversification]]. As [[Definition:Climate risk | climate-related]] losses intensify and traditional reinsurance pricing tightens, the index-linked segment of the ILS market continues to expand — with increasingly sophisticated indices, longer tenors, and growing interest from [[Definition:Insurtech | insurtech]] platforms that streamline issuance and secondary trading.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Insurance-linked security (ILS)]]
* [[Definition:Catastrophe bond]]
* [[Definition:Index trigger]]
* [[Definition:Special purpose vehicle (SPV)]]
* [[Definition:Basis risk]]
* [[Definition:Capital markets]]
{{Div col end}}

Definition:Index-linked security - Revision history

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