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We examine the existence of cost stickiness in the German property-liability insurance sector by analyzing if the percentage increase in administrative costs for a rise in premiums is larger than the percentage decrease in administrative costs for an equivalent drop in premiums. In addition, we analyze if sticky cost behavior depends on insurance firms’ organizational form. Using company-level data from German property-liability insurance firms for the years 2001–2017 and regression analyses, we find that administrative costs are sticky in the insurance sector, as administrative costs increase on average 0.82% per 1% increase in premiums but decrease only 0.6% per 1% decrease in premium income. Moreover, we find that stock insurers exhibit lower levels of cost stickiness, indicating better monitoring mechanisms.