Issue 046November 2026Updated
LRLossReserves.com
Subscribe
The WireCommercial Auto

Berkley Q3: Commercial Auto Reserve Drift Reaches Umbrella

W.R. Berkley's nine-month 10-Q shows Insurance segment adverse development tripling from $7 million at midyear to $22 million, with auto liability now concentrated in accident years 2022 through 2024. The new argument: the problem is moving into newer years, so fleets that treated 2022 and later as repaired should retest them.

By Sam, EditorNovember 2026 · 4 min read

W.R. Berkley’s Form 10-Q for the period ended September 30, 2026 reports $22 million of adverse prior-year development in its Insurance segment for the nine months, attributed to other liability and auto liability, with the auto liability piece concentrated in accident years 2022 through 2024. On the October 19 earnings call, management called commercial auto the primary source of adverse development in the insurance operation, including exposure that can extend into excess and umbrella coverage.

What changed since midyear

Our August read of the six-month filing recorded $7 million of adverse development in the Insurance segment and umbrella and excess trouble tied to accident years 2019 through 2023. The nine-month figure is $22 million. Simple subtraction puts about $15 million of that in the third quarter alone, roughly twice the first half’s pace in one quarter. (That is our arithmetic on two filings, not a figure Berkley reports.)

The vintage also moved. The midyear language reached back to 2019. The nine-month auto liability language names 2022 through 2024, years that many fleets and their actuaries have treated as post-repair years, priced after the 2019 to 2021 deterioration was already known.

Scale matters. Net of a $26 million favorable result in Reinsurance and Monoline Excess, Berkley’s nine-month prior-year development is $4 million favorable. The Insurance segment’s combined ratio was 91.7 for the third quarter, per Insurance Journal. This is not a large charge for Berkley. It matters because of where it sits.

Who it affects

Self-insured trucking, delivery, and transit fleets with auto liability retentions under an umbrella or excess tower; group captives and risk retention groups writing fleet auto; and public entities with vehicle fleets in a pool. Berkley’s book is carrier-mix, not fleet-mix, so its factors do not transfer to your triangle. The accident-year pattern does.

The reserve mechanism

The lever is severity on recent accident years, expressed through the development pattern. If auto liability for 2022 through 2024 is still developing adversely at 24 to 48 months of maturity, then the factors selected at earlier valuations understated the pass-through of large claims. A carrier with a short-tail property book absorbs that; Berkley said as much, since nine-month results reflect favorable short-tail development offsetting other liability and auto liability. A self-insured fleet has no such offset. Its adverse emergence lands on its own retained layer first, then on the excess attachment.

Pair this with capacity. Reinsurance net premiums written fell 11.6% to $369 million in the quarter, led by casualty, and management expects further contraction of 10% to 20% rather than accept ceding commissions it considers inadequate (per the call summary). Less casualty reinsurance behind excess writers means excess pricing and attachment terms at your renewal are less likely to soften. The Everest Q3 charge points the same way. Industry context sits in AM Best’s estimate of a $4 billion to $5 billion commercial auto shortfall; actuary.info’s summary of Berkley’s Q3 covers the pricing side.

Where this shows up in your reserves

Open your last three actuarial reports and find the auto liability development exhibit for accident years 2022 through 2024. Compare actual reported (or paid) losses at the latest age with what the chain ladder expected at the prior valuation. Then check the selected ultimate against the reported-plus-expected-emergence line. If ultimates sit at selected values above reported, you are leaning on judgment; if reported is converging on selected, the cushion is gone. See Commercial Auto and Fleet IBNR and Case Reserve Strengthening for how to read those exhibits.

What this means for your next review

Ask your actuary to rerun 2022 through 2024 with a higher severity trend and a longer tail beyond 60 months, and to show the effect on any layer where your retention touches an umbrella attachment. Ask also whether your 2022 and later years were given credit for rate and tort changes that the data has not yet confirmed.

Our read

Expect the retained layer to show the movement first. We think fleets with 2022 to 2024 auto reserves at or below reported-plus-expected-emergence should plan for upward selection at year-end 2026 valuations, with excess layers following through 2027. Fourth quarter reserve reviews from other commercial auto writers in late January and February 2027 will show whether this is Berkley-specific or industry-wide. One carrier’s nine-month number cannot settle that; a repeat would.

Sources

More from The Wire
Commercial Auto

Berkley Q2 Filing: Excess Auto Development Flags SIR Reserve Gap

W.R. Berkley's H1 2026 10-Q discloses adverse umbrella and excess development concentrated in accident years 2019-2023 tied to underlying auto, signaling that primary retained layers beneath those programs are likely developing on the same trajectory.

3 min read
Commercial Auto

AM Best Halves Commercial Auto Gap; 2023 Still Developing

AM Best's October 29 commercial auto review cuts its reserve deficiency estimate to $2 billion to $3 billion, as reported by Risk & Insurance. The new argument: the gap closed because carriers booked about $2 billion of adverse development, not because ultimates fell, so a fleet that has not yet taken that hit has nothing to release.

6 min read
General Liability

Everest's $600M Gross Casualty Charge Reaches Excess Towers

Everest booked about $600 million of gross casualty strengthening in Q3 2026 (net adverse development of $253 million) while holding reserves more than $850 million above its own central estimate. The new argument: a reinsurer funding above central, and shrinking its casualty book, is a confidence-level and capacity benchmark for self-insured excess programs.

3 min read
All explainers
Captives

IBNR for Single-Parent Captives: A Plain-English Guide for Captive Owners and Risk Managers

What IBNR means for a single-parent captive insurer, how actuaries estimate it, and what to expect from the annual reserve study and Statement of Actuarial Opinion.

13 min read
Fundamentals

What Could Be Wrong With Your Reserves: A Self-Insured's Guide to Diagnostic Review

A framework for identifying whether your reserve estimate was distorted by operational changes, and the specific questions that turn a black-box number into something you can evaluate.

11 min read
Methods

Chain Ladder: How Actuaries Project Claims From Historical Patterns

The chain ladder is the most widely used reserving method, and the one most likely to produce the number on your balance sheet. Here is how it works, what it assumes, and where it fails.

13 min read