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📕 '''Closed book''' refers to a portfolio of [[Definition:Insurance policy | insurance policies]] that is no longer open to new business but continues to exist as a block of in-force contracts with ongoing obligations — [[Definition:Claim | claims]] to be paid, [[Definition:Insurance reserves | reserves]] to be maintained, and [[Definition:Policyholder | policyholders]] to be serviced — until the last policy expires, matures, or lapses. Closed books are most commonly associated with [[Definition:Life insurance | life insurance]] and [[Definition:Annuity | annuity]] portfolios, where contracts can remain in force for decades, but they also arise in [[Definition:Non-life insurance | non-life]] lines when an insurer exits a product or market. The term carries significant strategic and financial weight because a closed book still consumes [[Definition:Regulatory capital | regulatory capital]], demands administrative resources, and generates [[Definition:Investment income | investment income]] and [[Definition:Underwriting profit | underwriting results]] — sometimes profitably, sometimes not.

⚙️ Managing a closed book efficiently requires specialized capabilities that differ materially from those needed to grow a writing company. [[Definition:Actuarial | Actuarial]] teams must project run-off patterns and monitor [[Definition:Experience variance | experience assumptions]] — mortality, lapse, expense — against a shrinking pool of policies where small deviations can have outsized effects on profitability. Over the past two decades, a distinct segment of the insurance industry has emerged around acquiring and consolidating closed books: companies such as Resolution Life, Athene, and Phoenix Group have built business models predicated on purchasing legacy portfolios, extracting capital efficiencies through scale, and optimizing [[Definition:Asset-liability management (ALM) | asset-liability management]] on the acquired blocks. In some cases, [[Definition:Part VII transfer | Part VII transfers]] (in the UK) or [[Definition:Insurance business transfer (IBT) | insurance business transfer]] mechanisms (in other jurisdictions) are used to move closed books between legal entities, while [[Definition:Reinsurance | reinsurance]] transactions — particularly [[Definition:Loss portfolio transfer (LPT) | loss portfolio transfers]] and [[Definition:Adverse development cover (ADC) | adverse development covers]] — allow the economic risk of a closed book to be shifted without necessarily moving the policies themselves.

📊 Closed books matter to the broader industry because they tie up capital that could otherwise be deployed into new underwriting opportunities. For many legacy [[Definition:Insurance carrier | carriers]], especially in mature European and Japanese life markets, the majority of their in-force business resides in closed books written under older product generations — sometimes carrying guaranteed interest rates that exceed current investment yields, creating a persistent drag on profitability. Regulators pay close attention to the management of closed books to ensure that policyholders continue to receive fair treatment and that the administering entity maintains adequate [[Definition:Solvency | solvency]] throughout the run-off period. The growth of the closed book consolidation market has become one of the defining structural trends in global life insurance, attracting billions in [[Definition:Private equity | private equity]] capital and reshaping the competitive landscape as writing companies shed legacy blocks to focus on growth-oriented business.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Run-off]]
* [[Definition:Loss portfolio transfer (LPT)]]
* [[Definition:Part VII transfer]]
* [[Definition:Legacy business]]
* [[Definition:Asset-liability management (ALM)]]
* [[Definition:Life insurance]]
{{Div col end}}

Definition:Closed book - Revision history

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