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🎯 '''Concentration risk sub-module''' is the element of the [[Definition:Solvency capital requirement (SCR) | solvency capital requirement (SCR)]] under [[Definition:Solvency II | Solvency II]] that captures the additional risk arising when an [[Definition:Insurance undertaking | insurer's]] [[Definition:Investment portfolio | investment portfolio]] is overly exposed to a single counterparty, group of connected counterparties, or individual asset. Housed within the [[Definition:Market risk module | market risk module]] of the [[Definition:Standard formula | standard formula]], it addresses a danger that diversified-portfolio assumptions elsewhere in the SCR calculation do not fully cover: the scenario where the default, downgrade, or sharp price decline of a single concentrated holding inflicts disproportionate damage on the insurer's [[Definition:Own funds | own funds]].

⚙️ The calculation works by identifying exposures to individual counterparties or single-name assets that exceed defined thresholds relative to the insurer's total assets. Once an exposure crosses the threshold — which varies by [[Definition:Credit quality step | credit quality step]] of the counterparty — the excess is subjected to risk factors that increase with the size of the overconcentration and decrease with the counterparty's creditworthiness. Government bonds denominated in the domestic currency of the issuing sovereign are typically exempt, reflecting the assumption that these carry negligible default risk for solvency purposes (though this assumption has itself been debated, particularly in the aftermath of the European sovereign debt crisis). The sub-module also considers concentration in [[Definition:Property investment | property]] investments, applying a capital charge when a single property or a tightly clustered group of properties exceeds a specified proportion of total assets. Importantly, the sub-module interacts with other market risk sub-modules — such as [[Definition:Spread risk sub-module | spread risk]] and [[Definition:Equity risk sub-module | equity risk]] — through the correlation matrix, so its contribution to the aggregate SCR depends on the broader portfolio structure.

📊 Concentration risk is a perennial concern for [[Definition:Supervisory authority | supervisors]] because it has been at the root of some of the most severe insurer failures and near-failures in history — cases where an insurer's solvency was destroyed not by a catastrophic insurance event but by the collapse of a single large investment exposure or banking counterparty. The sub-module incentivizes diversification by making concentrated positions expensive in capital terms, which directly influences how [[Definition:Chief investment officer (CIO) | investment teams]] at insurance companies allocate across asset classes, counterparties, and geographies. Beyond Solvency II, the principle is echoed in other regimes: [[Definition:Risk-based capital (RBC) | RBC]] frameworks in the United States impose concentration charges on large single-issuer holdings, and [[Definition:China Risk Oriented Solvency System (C-ROSS) | C-ROSS]] penalizes excessive exposure to connected parties. For smaller insurers and [[Definition:Captive insurance undertaking | captives]] whose investment universes may be inherently narrow, the concentration risk sub-module can be a binding constraint that shapes the entire asset allocation strategy.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Market risk module]]
* [[Definition:Spread risk sub-module]]
* [[Definition:Solvency capital requirement (SCR)]]
* [[Definition:Credit quality step]]
* [[Definition:Investment risk]]
* [[Definition:Counterparty default risk module]]
{{Div col end}}

Definition:Concentration risk sub-module - Revision history

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