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📐 '''Kenney ratio''' is a financial benchmark used to evaluate the adequacy of a [[Definition:Property and casualty insurance | property and casualty]] insurer's [[Definition:Policyholder surplus | policyholder surplus]] relative to its [[Definition:Unearned premium reserve | unearned premium reserves]] or [[Definition:Net loss reserve | net loss reserves]]. Developed by insurance analyst Roger Kenney in the mid-twentieth century, the ratio was originally expressed as the relationship of surplus to net [[Definition:Written premium | written premiums]], with a 1-to-1 ratio — meaning one dollar of surplus for every dollar of premiums — serving as the traditional rule-of-thumb benchmark for adequate capitalization. Although more sophisticated [[Definition:Risk-based capital (RBC) | risk-based capital]] frameworks have since supplemented it, the Kenney ratio endures as a quick, intuitive gauge that [[Definition:Insurance analyst | analysts]], [[Definition:Insurance regulator | regulators]], and [[Definition:Rating agency | rating agencies]] reference when screening carrier financial health.

📊 Calculating the ratio is straightforward: divide [[Definition:Policyholder surplus | policyholder surplus]] by [[Definition:Net written premium | net written premiums]] (or, in some formulations, by net [[Definition:Loss reserve | loss reserves]]). A ratio above 1.0 suggests that the insurer holds more surplus than the volume of risk it is underwriting — a sign of conservative capitalization. A ratio well below 1.0 may indicate that the company is leveraging its surplus aggressively, writing more [[Definition:Premium | premium]] volume than its capital base comfortably supports. However, context matters: long-tail lines like [[Definition:General liability insurance | general liability]] or [[Definition:Medical malpractice insurance | medical malpractice]] carry different reserve dynamics than short-tail [[Definition:Property insurance | property]] business, so a single threshold does not apply uniformly across all lines.

🔎 Despite its simplicity, the Kenney ratio remains a useful first-pass filter in an industry awash in more complex metrics. [[Definition:Reinsurance | Reinsurers]] evaluating [[Definition:Ceding company | ceding companies]], [[Definition:Insurance broker | brokers]] vetting carrier security, and [[Definition:Insurtech | insurtech]] platforms building automated carrier-selection algorithms all benefit from a measure that condenses [[Definition:Solvency | solvency]] posture into a single number. Its limitations are well understood — it ignores [[Definition:Asset quality | asset quality]], [[Definition:Investment portfolio | investment portfolio]] composition, and the nuances of [[Definition:Reserve adequacy | reserve adequacy]] — but as a screening tool that can quickly flag outliers for deeper investigation, the Kenney ratio still earns a place in any insurance financial analyst's toolkit.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Policyholder surplus]]
* [[Definition:Risk-based capital (RBC)]]
* [[Definition:Combined ratio]]
* [[Definition:Net written premium]]
* [[Definition:Solvency]]
* [[Definition:Loss reserve]]
{{Div col end}}

Definition:Kenney ratio - Revision history

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