Follow the chain left → right, from inputs to end demand. Tap any company to trace its links.
Raw inputs
Equipment
Foundry
Chip design
Software
AI demand
—
Company details
Market cap
~$90B
P/E ratio
~22×
Div yield
~1.9%
Net income
~$4.2B
Profit margin
~15%
Rev. growth
+10%
Revenue
~$27B
Segments
2
In plain English
Marsh McLennan is the world's largest insurance broker and risk adviser — it doesn't carry insurance risk itself. It sits in the middle of the insurance chain: Marsh places cover for companies with insurers, Guy Carpenter places reinsurance for insurers, and on the advisory side Mercer (health, pensions, investments) and Oliver Wyman (strategy) sell professional services. It earns commissions and fees, not premiums, and grows by buying up brokers — McGriff (~$7.75B, 2024) and JLT (~$5.6B, 2019). It rebranded everything to 'Marsh' and changed its ticker to MRSH in January 2026.
In simple terms
What Marsh McLennan really sells
Marsh McLennan is the world's largest insurance broker and risk adviser — it doesn't carry insurance risk itself. It sits in the middle of the insurance chain: Marsh places cover for companies with insurers, Guy Carpenter places reinsurance for insurers, and on the advisory side Mercer (health, pensions, investments) and Oliver Wyman (strategy) sell professional services. It earns commissions and fees, not premiums, and grows by buying up brokers — McGriff (~$7.75B, 2024) and JLT (~$5.6B, 2019). It rebranded everything to 'Marsh' and changed its ticker to MRSH in January 2026.
Tip · Click any company in the map to learn — in one sentence — what it actually does and why it matters.