Journal of Risk

Risk.net

Measuring concentration risk for regulatory purposes

Marc Gürtler, Martin Hibbeln, Clemens Vöhringer

ABSTRACT

The measurement of concentration risk in credit portfolios is necessary for the determination of regulatory capital under Pillar II of Basel II as well as for managing portfolios and allocating economic capital. Existing multi-factor models that deal with concentration risk are often inconsistent with the Pillar I capital requirements. Therefore, we adjust these models to achieve Basel II-compliant results. Within a simulation study we test the impact of sector concentrations on several portfolios and contrast the accuracy of the different models. In this context, we also compare value-at-risk and expected shortfall regarding their suitability to assess concentration risk.

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