PlumBot: Bot: Creating new article from JSON

2026-03-16T08:49:31Z

Bot: Creating new article from JSON

New page

📊 '''Attritional loss ratio''' is a key performance metric in insurance and [[Definition:Reinsurance | reinsurance]] that isolates the portion of [[Definition:Loss ratio | loss ratio]] attributable to the steady, predictable stream of smaller claims — excluding [[Definition:Large loss | large losses]], [[Definition:Catastrophe loss | catastrophe losses]], and prior-year [[Definition:Reserve development | reserve development]]. By stripping out these volatile components, the attritional loss ratio reveals the underlying quality of an [[Definition:Underwriting | underwriting]] portfolio as it performs in normal conditions. It is one of the most closely watched indicators in earnings reports, investor presentations, and internal portfolio reviews across both [[Definition:Primary insurance | primary]] and reinsurance markets worldwide.

🔧 Calculating the attritional loss ratio begins with the overall [[Definition:Loss ratio | loss ratio]] for a given period, from which analysts subtract claims that exceed a defined large-loss threshold and any losses linked to [[Definition:Natural catastrophe | natural catastrophe]] events, as well as favorable or adverse movements in reserves established for prior accident years. The specific threshold separating attritional from large losses varies by company, line of business, and market convention — a property insurer might set it at a different level than a [[Definition:Professional liability insurance | professional liability]] writer. In Solvency II jurisdictions across Europe, granular segmentation of loss experience is embedded in regulatory reporting, while under [[Definition:IFRS 17 | IFRS 17]] the disaggregation of insurance service results encourages similar transparency. Analysts and [[Definition:Rating agency | rating agencies]] scrutinize trends in this metric over multiple years to assess whether pricing, [[Definition:Risk selection | risk selection]], and [[Definition:Terms and conditions | terms and conditions]] are genuinely adequate.

📈 The attritional loss ratio serves as a barometer of structural portfolio health because it filters out noise that can mask deteriorating or improving fundamentals. A company might report a strong headline [[Definition:Combined ratio | combined ratio]] in a year free of major catastrophes, yet its attritional loss ratio could be quietly worsening — signaling that [[Definition:Rate adequacy | rate adequacy]] is eroding or that [[Definition:Claims inflation | claims inflation]] is creeping into the book. Conversely, a year with heavy catastrophe activity might obscure genuine improvement in day-to-day underwriting discipline. For [[Definition:Chief underwriting officer (CUO) | chief underwriting officers]], portfolio managers, and investors alike, tracking this metric across cycles provides a far clearer picture of whether an insurer's core business is generating sustainable [[Definition:Underwriting profit | underwriting profit]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss ratio]]
* [[Definition:Combined ratio]]
* [[Definition:Large loss]]
* [[Definition:Catastrophe loss]]
* [[Definition:Reserve development]]
* [[Definition:Underwriting profit]]
{{Div col end}}

Definition:Attritional loss ratio - Revision history

PlumBot: Bot: Creating new article from JSON