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📊 '''Bid-offer spread''' — also called the bid-ask spread — is the difference between the price at which a buyer is willing to purchase a financial instrument and the price at which a seller is willing to sell it. In the insurance industry, this concept is most directly relevant to the trading and valuation of [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]], [[Definition:Catastrophe bond | catastrophe bonds]], [[Definition:Insurance company stock | insurer equities]], and [[Definition:Fixed-income security | fixed-income instruments]] held in insurer [[Definition:Investment portfolio | investment portfolios]]. The spread serves as a measure of [[Definition:Liquidity | liquidity]] and [[Definition:Transaction cost | transaction cost]]: a narrow spread indicates an actively traded, liquid instrument, while a wide spread signals limited trading interest, higher uncertainty, or structural illiquidity.

💹 For insurers managing large investment portfolios, bid-offer spreads have a direct impact on realized returns and on the [[Definition:Fair value | fair value]] measurement of assets reported in financial statements. Under both [[Definition:IFRS | IFRS]] and [[Definition:US GAAP | US GAAP]], insurers holding instruments at fair value must consider whether quoted prices reflect active markets; wide bid-offer spreads may indicate that Level 1 (quoted price) valuation is inappropriate and that Level 2 or Level 3 measurement techniques — involving observable or unobservable inputs — are required. In the [[Definition:Catastrophe bond | catastrophe bond]] secondary market, bid-offer spreads tend to be wider than those for comparably rated corporate bonds because of the market's smaller size and the specialized knowledge required to assess the embedded [[Definition:Catastrophe risk | catastrophe risk]]. Following major loss events such as hurricanes or earthquakes, spreads on affected cat bonds can widen dramatically as uncertainty about [[Definition:Loss estimate | loss outcomes]] peaks and buyers demand a larger discount.

🔍 The bid-offer spread also matters in the context of [[Definition:Reinsurance | reinsurance]] transactions and the broader [[Definition:Risk transfer | risk transfer]] market, though less literally. When reinsurance capacity is scarce, the implicit "spread" between what [[Definition:Cedant | cedants]] are willing to pay and what [[Definition:Reinsurer | reinsurers]] demand widens — mirroring the dynamics of financial-market bid-offer spreads. [[Definition:Insurance-linked securities (ILS) | ILS]] fund managers and [[Definition:Institutional investor | institutional investors]] allocating capital to insurance risk must incorporate bid-offer spread estimates into their return models, since the cost of entering and exiting positions in less liquid instruments can materially erode net performance. For [[Definition:Chief investment officer (CIO) | investment teams]] and [[Definition:Asset-liability management (ALM) | ALM]] practitioners at insurance companies, monitoring bid-offer spreads across asset classes is a practical tool for assessing market liquidity conditions and ensuring that portfolio assumptions about realizable values remain grounded in actual trading conditions.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Liquidity]]
* [[Definition:Catastrophe bond]]
* [[Definition:Insurance-linked securities (ILS)]]
* [[Definition:Fair value]]
* [[Definition:Investment portfolio]]
* [[Definition:Market risk]]
{{Div col end}}

Definition:Bid-offer spread - Revision history

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