Methodology: Insurance Operating Metrics
What these figures are
The Operating Metrics card on a property-and-casualty insurer’s stock page shows the operating statistics the company reports in its own quarterly earnings release — the SEC Form 8-K exhibit filed alongside the results. These are the numbers insurers use to describe how profitable their underwriting was, how much premium they wrote and earned, how much catastrophes cost, and the book value backing each share. Oxford Ledge reads them directly from the as-filed exhibit and normalizes the labels so you can compare an insurer to itself over time.
They are an Oxford Ledge Signal: our reading of a public filing, not a re-audit of the company’s books and not a licensed data-vendor feed. Every value on the card carries its filing as-of date and links back to the SEC source.
The metrics, in plain English
| Metric | What it measures |
|---|---|
| Combined ratio | Losses plus expenses as a percentage of premium. Below 100% is an underwriting profit; above 100% is a loss. The single most important P&C profitability measure. |
| Loss & expense ratios | The two components of the combined ratio — claims as a share of premium, and the cost of running the business as a share of premium. |
| Net premiums written / earned | Premium sold in the period (written), and the portion recognized as coverage elapsed (earned). Written leads earned; the gap signals growth. |
| Catastrophe losses | Claims from large, lumpy events (hurricanes, wildfires) broken out separately — the biggest source of quarter-to-quarter earnings volatility. |
| Book value / share | Net asset value per share — the primary valuation anchor for insurers, which trade on price-to-book. |
Why every value shows a scope and a basis
An insurer prints these metrics several ways in one filing, and mixing them buries the real number. So the card labels it:
- Scope. The card shows the firmwide (consolidated) figure. A multi-line insurer also reports each segment (personal lines, commercial, reinsurance), and a segment combined ratio can look very different; we never let a segment ratio stand in for the firmwide number.
- Basis. A combined or loss ratio comes on a calendar-year (as-reported) basis or an underlying / accident-year basis that strips out catastrophes and prior-year reserve development; the two differ, so we treat calendar-year as the headline and badge the underlying figure. Book value comes as reported, ex-AOCI (stripping bond mark-to-market swings), and tangible; we pin the plain reported figure and badge the others.
These labels are the honesty contract of the card: the same word can mean different things, and a reader deserves to know which one they are looking at.
Why the peer table leaves cells blank
On the industry peer table, each column pins one basis — the combined and loss ratios on the calendar-year basis, book value on the plain reported basis. An insurer is shown in a column only if it reports the metric on that basis; an insurer that leads with an underlying combined ratio, or an ex-AOCI book value, leaves an honest blank there, never a value pooled in from a different basis. A blank is a coverage gap, and the column footnotes how many insurers it covers.
How we read and normalize it
For each insurer we fetch the most recent quarterly earnings 8-K exhibit from SEC EDGAR, locate the financial-highlights table, and read each value verbatim from the reported column — never a prior-year or year-to-date column standing in for the quarter. We bind scope (firmwide vs a segment) from the table’s labels, and record each ratio’s basis (calendar vs underlying) and each book-value figure’s basis (reported, ex-AOCI, tangible) alongside it.
The reading is checked against a hand-verified golden set for each insurer before any figure is allowed to publish; a value whose scope or basis the extractor cannot confidently determine is withheld rather than shown.
What we deliberately do not do
- We do not re-audit. The figures are as reported by the issuer under regulatory convention. We normalize labels; we do not restate the company’s numbers.
- We do not let a segment stand in for the firmwide figure. A segment combined ratio is never shown as the consolidated number.
- We do not pool different bases. A calendar-year and an underlying combined ratio are different numbers; the peer table compares only like with like and leaves the rest blank.
- We do not treat these as forecasts, ratings, or advice. They are historical operating results a company disclosed, presented for study.
Freshness
The stock page is cached at the edge, so a brand-new filing’s figures can lag up to a day on the cached page. Each value is stamped with the filing it came from, so the as-of date always tells you exactly how current the number is.