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Large Cap
Insurance Brokers
Stocks Ranked by
Market Capitalization

Name Market cap Price Price
change %
MRSH
1
Marsh
MRSH
$92.9B
$92.9B $194.67 1.39%
AON icon
2
Aon
AON
$76.2B
$76.2B $359.10 1.12%
AJG icon
3
Arthur J. Gallagher & Co
AJG
$69.7B
$69.7B $271.99 3.1%
WTW icon
4
Willis Towers Watson
WTW
$32.6B
$32.6B $350.75 2.56%
BRO icon
5
Brown & Brown
BRO
$25B
$25B $74.62 2.33%
ERIE icon
6
Erie Indemnity
ERIE
$14B
$14B $268.64 1.43%

Large Cap Insurance Brokers Stocks at a Glance

Insurance brokers arrange coverage between clients and carriers, earning commissions and fees without underwriting risk. Capital-light and cash-generative, they compound through premium-rate cycles and acquisitions in a fragmented market.

There are 6 large cap Insurance Brokers stocks — companies in the Insurance Brokers industry with a market cap between $10B and $200B — worth a combined $310B.

The largest by market cap are Marsh (MRSH) at $92.9B, Aon (AON) at $76.2B and Arthur J. Gallagher & Co (AJG) at $69.7B.

Among institutional investors, Arthur J. Gallagher & Co (AJG) drew the most net new fund positions in Q2 2026: 162 funds opened new positions, taking total fund holders up 39 (3.1%) quarter-over-quarter.

  • Combined market cap: $310B across 6 stocks.
  • Large Cap: market cap between $10B and $200B.
  • Largest constituent: Marsh (MRSH), $92.9B market cap.
  • Most net new fund positions in Q2 2026: Arthur J. Gallagher & Co (AJG), +39 holders.

Market caps and prices updated daily; fund activity based on aggregated SEC 13F filings for Q2 2026.