Berkshire Hathaway vs Marsh & Mclennan Companies (BRK.B vs MMC)
Side by side from their SEC filings: revenue, margins, growth, returns and valuation, plus short interest, insider activity and institutional ownership.
Berkshire Hathaway is the larger company by revenue ($247.2B vs $27.0B) and market value ($1.1T vs $86.0B). Marsh & Mclennan Companies has grown revenue faster over the last 4 fiscal years (+36.1% cumulative vs +29.3%). Berkshire Hathaway trades at the lower trailing P/E (14.7x vs 22.3x).
About Berkshire Hathaway
Berkshire Hathaway Inc. is a holding company that owns subsidiaries operating in various industries, including insurance, freight rail transportation, and utility and energy generation and distribution. Its insurance businesses provide property, casualty, life, and health insurance and reinsurance services worldwide. The company serves a diverse range of customers through its decentralized subsidiaries, employing approximately 387,800 people globally.
About Marsh & Mclennan Companies
Marsh & McLennan Companies, Inc. provides risk management, insurance and reinsurance brokerage, and consulting services worldwide. Its Risk and Insurance Services segment includes Marsh Risk, which offers insurance broking, risk advisory, and program management, and Guy Carpenter, which specializes in reinsurance broking and strategic advisory. The Consulting segment delivers health, wealth, career advice, and management consulting services through Mercer and Marsh Management Consulting to organizations globally.
Head to head (BRK.B FY2025 vs MMC FY2025)
| Metric | BRK.BFY2025 | MMCFY2025 |
|---|---|---|
| Revenue | $247.24B | $26.98B |
| Revenue growth (YoY) | -1.0% | 10.3% |
| Gross margin | — | — |
| Operating margin | — | 23.1% |
| Net margin | 27.1% | 15.4% |
| Net income | $66.97B | $4.16B |
| Diluted EPS | — | $8.43 |
| FCF margin | 10.1% | 18.5% |
| ROE | 9.3% | 27.2% |
| Debt / equity | — | 1.2× |
| Market cap | $1.06T | $86.02B |
| P/E (TTM) | 14.7× | 22.3× |
Fundamentals are from each company’s SEC filings (BRK.B FY2025, MMC FY2025). P/E and market cap are derived from recent market prices and update daily.
Five-year trend (as reported)
| Revenue | FY2021 | FY2022 | FY2023 | FY2024 | FY2025 |
|---|---|---|---|---|---|
| BRK.B | $191.25B | $207.77B | $254.91B | $249.71B | $247.24B |
| MMC | $19.82B | $20.72B | $22.74B | $24.46B | $26.98B |
Peer standing
Where each company ranks among the 88 insurance companies, on the same scale. Each figure is ranked only against peers that report it. Percentiles describe position in the distribution, not a rating.
| Metric | BRK.B | MMC |
|---|---|---|
| Net margin | 27.1%90th percentile of 82 | 15.4%69th percentile of 82 |
| FCF margin | 10.1%31st percentile of 55 | 18.5%57th percentile of 55 |
| Revenue growth (YoY) | -1.0%20th percentile of 88 | +10.3%54th percentile of 88 |
| ROE | 9.3%31st percentile of 73 | 27.2%83rd percentile of 73 |
| P/E (TTM) | 14.7×63rd percentile of 71 | 22.3×80th percentile of 71 |
| Short interest (days to cover) | 2.19d31st percentile of 86 | 2.08d28th percentile of 86 |
Short interest
| FINRA settlement data | BRK.B | MMC |
|---|---|---|
| Shares sold short | 13.0M | 5.0M |
| Change vs prior settlement | +4.0% | -5.2% |
| Days to cover | 2.19 | 2.08 |
| As of settlement | 2026-06-30 | 2025-12-31 |
Source: FINRA Consolidated Short Interest. FINRA is the owner and source of the FINRA-supplied data; republishing or redistributing it is not permitted. Not presented as a percentage of float. No FINRA endorsement of this product is implied.
Insider activity (last 90 days)
| Form 4 open-market activity | BRK.B | MMC |
|---|---|---|
| Buys | 2 ($250,546) | — |
| Sells | 0 | — |
Open-market purchases and sales reported on SEC Form 4 (grants, exercises and tax withholding excluded). For context, about 16% of covered companies saw any open-market insider buy in a 90-day window.
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Data sourced from SEC EDGAR (public domain). Figures are as-reported and may be unaudited or restated; verify against the source filings before relying on them. Comparisons are descriptive (higher or lower on a reported figure), not a rating or a recommendation. Informational only. Not investment advice.