Direct Answer
W. R. Berkley Corporation reports revenue across 2 business segments in its fiscal 2025 Form 10-K. Insurance Domestic is the largest, with $12.1 billion of revenue (82% of the total), followed by Reinsurance and Monoline Excess at $1.8 billion (12%).
How Does W. R. Berkley Corporation Make Money?
Insurance Domestic supplies 82% of revenue, so W. R. Berkley Corporation's results move mostly with that one business; the others matter more for diversification than for the headline number. Between fiscal 2024 and 2025, Insurance Domestic grew fastest (+8.2%) and Reinsurance and Monoline Excess slowest (+5.0%), so the revenue mix tilts toward Insurance Domestic while that gap lasts.
| Segment | FY2025 revenue | FY2024 revenue | Share of revenue | Change |
|---|---|---|---|---|
| Insurance Domestic | $12.1 billion | $11.2 billion | 82.2% | 8.2% |
| Reinsurance and Monoline Excess | $1.8 billion | $1.7 billion | 12.1% | 5.0% |
What the Segment Figures Do Not Show
The rows above add up to 94% of W. R. Berkley Corporation's reported revenue for fiscal 2025; the difference is intersegment eliminations, corporate revenue or items the company reports outside its segments. Segment definitions are management's choice and change when a company reorganizes, in which case it restates prior years in the next filing, so a multi-year comparison should use the figures from a single filing. Revenue shows where sales come from, not where profit or cash is earned: a small segment can carry most of the margin.
Where These Numbers Come From
Every figure on this page is a value W. R. Berkley Corporation reported in the segment note and revenue disclosures of its Form 10-K filed February 27, 2026 (accession 0000011544-26-000005), read from the SEC's Financial Statement Data Sets. The prior-year column is the comparative figure from that same filing, so it reflects any restatement for a change in segments. Category names are the company's own XBRL labels, lightly reformatted for reading.
Rows that only total other rows (for example a "Products" line beside the individual products) are left out so nothing is counted twice. This page is educational and describes reported history for fiscal 2025; it is not a forecast or a recommendation.
Frequently Asked Questions
What are W. R. Berkley Corporation's business segments?
In its fiscal 2025 Form 10-K, W. R. Berkley Corporation reports revenue for Insurance Domestic and Reinsurance and Monoline Excess.
Which part of W. R. Berkley Corporation brings in the most revenue?
Insurance Domestic, with $12.1 billion of revenue in fiscal 2025, or 82% of the total.
Where does W. R. Berkley Corporation report its segment results?
In the segment note to the financial statements in its Form 10-K, most recently filed February 27, 2026, alongside management's discussion of each segment's results.