WTW's broking arm is growing faster than Aon's, Marsh's and Gallagher's
Four of the world's biggest insurance brokers reported second-quarter results within nine days of each other this month, which makes for a rare like-for-like comparison. WTW and Arthur J. Gallagher both reported on 30 July, Aon the day before, and Marsh McLennan about a week earlier. On the broking side specifically, WTW came out ahead of all three. WTW's Risk & Broking segment grew organic revenue by 7% in the quarter. Gallagher's Brokerage segment, the most directly comparable unit, grew 5%.
How this was made

The 30-second read
Why it matters
The key actionable takeaway is relative core placement growth: WTW leads on organic growth (7% in Risk & Broking), Gallagher and Aon are around 5% on comparable measures, and Marsh lags (3% overall, with Guy Carpenter down 2% from softer reinsurance pricing). Reported GAAP profitability declines for WTW and Gallagher are largely explained by acquisition integration costs and prior-year comparables, while adjusted EPS trends reverse the GAAP picture.
Market read
Traders can use the segment organic growth ranking to reassess broker relative momentum, while treating GAAP vs adjusted divergences as acquisition-integration effects rather than pure operating deterioration.
What to watch
The article focuses on organic revenue and integration costs, but traders may also want to track deal pipeline, pricing/volume mix, and reinsurance rate trajectory beyond the single-quarter Guy Carpenter drag.
Background
Four major insurance brokers reported Q2 results within nine days, enabling a rare like-for-like comparison of organic growth across broadly comparable broking segments.
Ticker impact
WTW reported Q2 organic revenue growth of 7% in Risk & Broking, with GAAP EPS down but adjusted EPS up on acquisition integration costs.
Near-term sentiment likely supported by the stronger organic growth and adjusted EPS, partially offset by the GAAP earnings decline.
The article provides segment organic growth and reconciles GAAP vs adjusted EPS to specific, recurring acquisition costs, which traders can map to earnings quality and forward expectations.
Arthur J. Gallagher’s Brokerage segment grew 5% organic, while reported earnings fell, with the gap attributed to AssuredPartners integration costs.
Stock reaction risk is mixed: growth is solid but GAAP earnings softness and integration cost visibility can cap upside.
The text distinguishes blended segment growth from the narrower brokerage measure and attributes the GAAP vs adjusted divergence to identifiable integration and prior-year interest income.
Aon’s Risk Capital solution line delivered around 5% organic growth, with both Commercial Risk and Reinsurance growing 5% in Q2.
Likely limited incremental trading signal versus WTW, unless investors re-rank brokers based on segment organic growth.
The article gives organic growth detail but does not provide a similarly specific profitability shock narrative for Aon as it does for WTW and Gallagher.
Market effects
Reinforces that broker organic growth is being judged through acquisition-integration noise, with segment comparability (broking vs claims admin) critical.
No explicit regional catalyst; primarily US-listed broker earnings comparison.
Global insurance brokerage demand and reinsurance pricing trends are reflected in segment organic growth differences.
Counterpoint
Adjusted EPS strength may be less durable if integration costs remain elevated longer than expected, meaning GAAP weakness could persist even as organic growth looks good.
Key entities
- public_companyWTW
WTW’s Risk & Broking segment organic revenue grew 7% in Q2; GAAP EPS fell but adjusted EPS rose due to Newfront integration costs.
- public_companyArthur J. Gallagher
Gallagher’s Brokerage organic revenue grew 5%, with GAAP earnings down and adjusted EPS up due to AssuredPartners integration costs.
- public_companyAon
Aon’s Risk Capital solution line delivered around 5% organic growth, with Commercial Risk and Reinsurance each growing 5%.
- public_companyMarsh McLennan
Marsh’s Risk and Insurance Services segment grew 3% organically, dragged by a 2% decline at Guy Carpenter from softer reinsurance pricing.



