Guy Carpenter, the world's largest reinsurance broker by revenue, earned $374 million in the third quarter, down from $398 million a year earlier. The 6% decline is the same on a GAAP and an underlying basis, so currency and acquisitions explain none of it (Marsh Q3 2026 release, Oct. 15, 2026). The rest of Marsh grew. Its primary insurance broking rose 5% underlying to $3.7 billion, and group adjusted earnings rose 10% to $2.03 a share.
The decline is the price of a well-supplied reinsurance market, printed on the one income statement that measures it directly. Artemis counts $18.9 billion of cat bond issuance through September, a nine-month record, with $65.5 billion outstanding (Artemis, Oct. 1, 2026). Two days before Marsh reported, Swiss Re's Leopoldo Camara called the growing capital supply "actually good news because more capital is needed to address the growing risks" (Reinsurance News, Oct. 13, 2026). It is good news for cedents. For a broker paid on ceded premium, it is a smaller base.
Key Takeaways
- $374 million against $398 million: Guy Carpenter's Q3 revenue, down 6%, after a 2% decline in Q2 ($664 million). Nine-month revenue is $2,278 million against $2,281 million, down 1% underlying.
- 5% underlying growth at Marsh's primary broking, to $3.7 billion, and 3% underlying for the Risk and Insurance Services segment as a whole, at a 24.6% adjusted margin.
- $18.9 billion of cat bonds issued in nine months, beating the previous full-year record of $18.6 billion, with 14 first-time sponsors in 2026 and "continued softening of risk spreads."
- $569 million of Greensill litigation charges in nine months, $144 million of them in Q3, more than one and a half times Guy Carpenter's quarterly revenue.
- $648 billion of dedicated reinsurance capital at Gallagher Re's last count, a record built on retained earnings rather than new entrants.
What the Quarter Shows
Marsh's consolidated revenue was $6.9 billion, up 8% reported and 5% underlying. Adjusted earnings per share rose 10% to $2.03. GAAP earnings were $1.69, with the gap mostly the Greensill charge and $30 million of legal costs in a restrictive-covenant suit against a competitor. The company bought back $500 million of stock in the quarter (Marsh release, Oct. 15, 2026).
Inside the Risk and Insurance Services segment the two businesses moved apart. Marsh, the primary broker, grew to $3,726 million from $3,400 million, 10% reported and 5% underlying. Guy Carpenter fell 6%. The segment's adjusted margin held at 24.6%, within a tenth of a point of last year, so the reinsurance shortfall was absorbed rather than cut.
The trend matters more than the quarter. Guy Carpenter was flat in the first half, down 2% in Q2, and down 6% in Q3. Most property catastrophe treaties renew on January 1, June 1 and July 1, so the third-quarter print carries the mid-year renewals that Florida and other peak-zone cedents placed into the softest market since 2023.
| Marsh, Q3 2026 | Revenue | Underlying growth |
|---|---|---|
| Guy Carpenter (reinsurance) | $374M | -6% |
| Marsh (primary broking) | $3,726M | +5% |
| Risk and Insurance Services | $4.2B | +3% |
| Consolidated | $6.9B | +5% |
| Guy Carpenter, Q2 2026 | $664M | -2% |
Source: Marsh Q3 2026 and Q2 2026 earnings releases.
Why More Capital Means Less Broker Revenue
A reinsurance broker's revenue is a brokerage on the premium its clients cede. Two things move that base. The rate on line sets the price per unit of limit, and the cedent's retention sets how much risk it buys cover for at all. In a well-capitalized market both move against the broker. Reinsurers compete the rate down, and cedents, flush with their own capital, keep more risk net.
The capital is there. Gallagher Re put dedicated reinsurance capital at a record $648 billion, most of it retained earnings from three profitable years. Cat bonds add a third-party layer on top: $65.5 billion outstanding at the end of September, after $948 million of third-quarter issuance from 10 deals (Artemis, Oct. 1, 2026). Aon counts a further $23 billion of sidecar capital. Each dollar is capacity that bids the rate down at the next renewal.
Camara's remark captures the reinsurer's view. For Swiss Re, which sells capacity, more supply is manageable because demand is also rising. For Guy Carpenter, which earns a percentage of the transaction, the volume of capital matters less than the price it clears at. A 6% revenue decline with no loss of clients is a price decline.
The cat bond market also pays the broker differently. A reinsurance placement earns a brokerage on the treaty. A cat bond earns a structuring fee through the broker's capital markets arm, usually smaller per dollar of limit and booked once. As peak-zone cover migrates from treaty to bond, the same risk transfer produces less recurring broker revenue.
The Broker Prints the Price Before the Renewal Does
January 1, 2027 renewals are three months away, and brokers are already guiding to further property catastrophe declines. Guy Carpenter's third-quarter revenue is an early reading of that price, because it reflects what cedents actually paid at mid-year rather than what brokers expect. Down 6% on a flat client base says mid-year rates fell more than the single-digit figures quoted in July.
The complication for Marsh is that the same capital pushes its larger business the same way. Primary commercial rates have been falling for seven quarters by Marsh's own index, and the primary broker's 5% growth comes from volume and new business while its commission base shrinks on renewals. Guy Carpenter shows the effect first because reinsurance prices move faster and its clients are fewer.
Nine-month Guy Carpenter revenue is down only 1%, which looks like stability. It is two flat quarters and one weak one, and the weak one is the most recent. If January 1 delivers the double-digit property cat declines brokers are now forecasting, the first quarter of 2027, when most of that premium is booked, will be the fourth decline in a row.
Further Reading
- Reinsurance's $648B Capital Record Is Retained, Not New – where the capital pushing rates down came from.
- 2026 Cat Bond Issuance Outpaces 2025 With $14B Maturing – the reinvestment wave behind the record issuance year.
- Aon Counts $23B of Sidecar Capital, Up 50% – the sidecar layer of third-party capital.
- Cat Bond Spread Compression Tests Retro Pricing – how falling cat bond spreads reach treaty prices.
- Marsh's Q2 2026 Index: Property and Casualty Rates Diverge – the primary rate index that shows the same softening on the insurance side.
Sources
- Marsh, Third Quarter 2026 Results (Form 8-K exhibit), Oct. 15, 2026
- Marsh, Second Quarter 2026 Results (Form 8-K exhibit), July 2026
- Artemis, Catastrophe bond market keeps record pace after above-average Q3, Oct. 1, 2026
- Reinsurance News, Growing reinsurance capital supply is good news as systemic risks increase: Swiss Re, Oct. 13, 2026