Finn
MMC Insurance services · Large cap · Professional services · Insurance broker · Thesis updated July 27, 2026

Consulting strength masks historic reinsurance pricing drops

01 Running thesis

A steady compounder with fresh overhangs

Marsh is a high quality, slow and steady business. Clients use it to buy insurance, manage risk, design health and retirement plans, and get strategy advice. Those needs do not disappear in a weak economy, which gives the company a more stable base than many service firms.

The newest quarter shifted the balance of the business. In Q2 2026, Consulting grew 8% on an underlying basis, while Risk and Insurance Services grew 3%. That matters because a historic 16% drop in property catastrophe pricing is holding back the larger risk business. Consulting, especially management consulting on AI strategy, is helping offset that pressure.

The bull case is about scale, data, and cost control. Management reaffirmed its full year 2026 outlook and increased capital deployment to $5.5 billion. It also rolled out an internal AI tool called LenWork to control rising technology costs while maintaining productivity.

The bear case centers on cyclical headwinds. Reinsurance pricing can keep weighing on growth, as seen with Guy Carpenter falling 2% in the second quarter. The $425 million Greensill litigation charge also adds a legal risk that is hard for outside investors to size.

Jul 2026Q2 2026 showed a clear split. Consulting surged 8% underlying, driven by management consulting, but a historic 16% drop in property catastrophe pricing pushed Guy Carpenter into negative growth.
Apr 2026Q1 2026 kept the thesis balanced. Consulting grew faster than Risk and Insurance Services, but the $425 million Greensill charge added a real overhang.
Feb 2026The 2025 10-K made the Marsh rebrand official and added execution risk around Thrive. Full year 2025 showed Consulting growing 5% underlying and Risk and Insurance Services growing 4%.
Jan 2026Q4 2025 confirmed the split in the business. Consulting stayed stronger, while Risk and Insurance Services slowed as reinsurance pricing softened.
Oct 2025Marsh detailed the Thrive program, including a target for about $400 million of savings over three years. That strengthened the margin case, while also adding restructuring and execution risk.
Jul 2025Q2 2025 showed 4% underlying revenue growth and 50 basis points of adjusted operating margin expansion. Lower fiduciary interest income and softer discretionary consulting work became clearer headwinds.
Apr 2025Q1 2025 showed a solid start, with adjusted EPS growth and 50 basis points of adjusted operating margin expansion. That reduced concern that higher expenses were eating the model.
02 Business model

Advice fees tied to client risk

Marsh earns fees and commissions by helping companies and governments understand risk and buy insurance. It also helps insurers and reinsurers manage risk through Guy Carpenter. In simple terms, it gets paid because risk is hard to price and clients need expert help.

The Consulting segment earns money from Mercer and Marsh Management Consulting. Mercer helps with health benefits, retirement and investment plans, and workforce advice. Marsh Management Consulting works on strategy, economic, and brand questions.

The model breaks when clients spend less on projects or when insurance pricing falls enough to slow commission growth. Lower fiduciary interest income can also hurt results. Fiduciary interest income is interest earned on client money held before it is passed along.

The company is also reshaping itself. It changed its brand to Marsh in January 2026 and is building Business and Client Services under the Thrive program. Thrive is meant to use automation and shared operations to cut costs, but execution carries real risks.

03 Product portfolio

Four engines under one brand

Cash cow

Marsh Risk

Marsh Risk gives risk advice and insurance solutions to large and mid-sized clients. It is the core broking engine and is highly exposed to insurance premium pricing.

Steady

Guy Carpenter

Guy Carpenter helps insurers and reinsurers with risk, reinsurance, and capital strategy. Growth shrank 2% in Q2 2026 as reinsurance pricing dropped.

Growth engine

Mercer Health

Mercer Health helps employers design and manage health benefit plans. The business provides a stable recurring revenue base.

Steady

Mercer Wealth and Career

Wealth advises on retirement and investment outcomes, while Career handles workforce advice. Career project work in the U.S. has faced persistent softness.

Growth engine

Marsh Management Consulting

This business gives strategic, economic, and brand advice. It grew 13% on an underlying basis in Q2 2026, aided by AI advisory demand.

Option

AI and automation

Management wants Marsh to be an AI winner by using its scale and proprietary data. In-house tools like LenWork aim to cut rising token costs.

04 Business segments

Two segments, one bigger than the other

Risk and Insurance Services66%modest
Consulting34%growing fast

Segment mix uses Q1 2026 revenue from the 10-Q, with $5.1 billion for Risk and Insurance Services and $2.6 billion for Consulting. Risk and Insurance Services is the larger segment, making it highly sensitive to soft pricing.

05 Risk factors

What could go wrong

Soft insurance pricing

High impact · High odds

Risk and Insurance Services grew 3% on an underlying basis in Q2 2026, but Guy Carpenter shrank 2%. Property catastrophe pricing fell 16%, the steepest drop in 25 years. If insurance and reinsurance pricing keep falling, the largest segment will struggle to grow.

We watchWatch underlying growth in Risk and Insurance Services and management comments on property catastrophe premium rates.

Greensill litigation

High impact · Medium odds

In Q1 2026, Marsh recorded an estimated liability and legal expenses of $425 million related to the Greensill litigation. Management could not give much more detail because the case is ongoing. The open question is whether the final cost is higher than the amount already recorded.

We watchWatch future 10-Q and 10-K legal contingency notes for changes to the Greensill liability.

Thrive execution miss

Medium impact · Medium odds

Thrive is meant to improve efficiency through automation, workforce actions, and shared operations under Business and Client Services. The company warns it may not fully realize the benefits of Thrive. A miss would weaken the margin story.

We watchWatch reported margin expansion and any disclosed savings cadence from Thrive.

Consulting project weakness

Medium impact · Medium odds

Consulting is helping offset slower risk growth, but it is not risk free. Mercer's Career business has faced underlying declines due to lower project-related work in the U.S. and Canada. If clients keep delaying discretionary work, Consulting growth could slow.

We watchWatch Mercer's Career underlying growth and comments on project-related work in the U.S. and Canada.

AI and cyber disruption

Medium impact · Medium odds

Management sees AI as a growth and efficiency tool, but the 10-K names digital disruption, AI change, and cyber threats as risks. Management also noted rising AI token costs in Q2 2026. Bad execution could let rivals move faster or inflate technology expenses.

We watchWatch for disclosed cyber incidents, AI-related spending with no margin benefit, and management updates on AI-driven revenue.
06 Quick answers

In one breath

What does Marsh actually do?

Marsh helps companies and governments understand risk, buy insurance, manage benefits, and solve consulting problems. Its main businesses are Marsh Risk, Guy Carpenter, Mercer, and Marsh Management Consulting.

Why did Marsh change its name?

The company updated its brand from Marsh McLennan to Marsh in January 2026. Its main businesses were also rebranded, but the core revenue drivers did not change.

What is the biggest issue for Marsh right now?

The biggest business issue is soft insurance and reinsurance pricing, which pressures Risk and Insurance Services. The biggest new legal issue is the $425 million Greensill litigation charge.

What could make the stock story improve?

Investors need to see Risk and Insurance Services stabilize, Mercer's Career business recover, and Thrive produce visible savings. Continued high growth in AI strategy consulting would also help the bull case.

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