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Compare · AJG vs AON

AJG vs AON

Side-by-side comparison of Arthur J. Gallagher & Co. (AJG) and Aon plc (AON): market cap, price performance, sector, and recent activity on the wire.

Summary

  • Both AJG and AON operate in Specialty Insurers (Finance), so they compete in similar markets.
  • AON is the larger of the two at $66.53B, about 1.2x AJG ($53.46B).
  • Over the past year, AJG is down 37.2% and AON is down 12.5% - AON leads by 24.7 points.
  • AON has been more active in the news (9 items in the past 4 weeks vs 8 for AJG).
  • Both have 25 recent analyst ratings on file.
PerformanceAJG-37.21%AON-12.54%
2025-05-02+0.00%2026-05-01
MetricAJGAON
Company
Arthur J. Gallagher & Co.
Aon plc
Price
$208.09+0.82%
$311.65-0.00%
Market cap
$53.46B
$66.53B
1M return
-3.83%
-3.05%
1Y return
-37.21%
-12.54%
Industry
Specialty Insurers
Specialty Insurers
Exchange
NYSE
NYSE
IPO
News (4w)
8
9
Recent ratings
25
25
AJG

Arthur J. Gallagher & Co.

Arthur J. Gallagher & Co., together with its subsidiaries, provides insurance brokerage, consulting, and third party claims settlement and administration services in the United States, Australia, Bermuda, Canada, the Caribbean, New Zealand, India, and the United Kingdom. Its Brokerage segment consists of retail and wholesale insurance brokerage operations. It offers brokerage and consulting services to businesses and organizations, including commercial, not-for-profit, and public entities, as well as individuals in the areas of insurance placement, risk of loss management, and management of employer sponsored benefit programs. This segment also assist retail brokers and other non-affiliated brokers in the placement of specialized and hard-to-place insurance; acts as a brokerage wholesaler, and managing general agent or managing general underwriter distributing specialized insurance coverage's for underwriting enterprises; and performs activities, including marketing, underwriting, issuing policies, collecting premiums, appointing and supervising other agents, paying claims, and negotiating reinsurance. The company's Risk Management segment provides contract claim settlement and administration services for enterprises and public entities; and claims management, loss control consulting, and insurance property appraisal services. The company offers its services through a network of correspondent insurance brokers and consultants. It serves commercial, industrial, public entity, religious, and not-for-profit entities. Arthur J. Gallagher & Co. was founded in 1927 and is headquartered in Rolling Meadows, Illinois.

AON

Aon plc

Aon plc, a professional services firm, provides advice and solutions to clients focused on risk, retirement, and health worldwide. It offers commercial risk solutions, including retail brokerage, cyber, and global risk consulting solutions, as well as acts as a captive insurance solutions provider; and health solutions, such as health and benefits brokerages, and health care exchanges. The company also provides treaty and facultative reinsurance, as well as insurance-linked securities, capital raising, strategic advice, restructuring, and mergers and acquisitions services; and corporate finance advisory services and capital markets solutions products. In addition, it offers strategic design consulting services on their retirement programs, actuarial services, and risk management services; advice services on developing and maintaining investment programs across a range of plan types, including defined benefit plans, defined contribution plans, endowments, and foundations for public and private companies, and other institutions; and advice and solutions that help clients in accelerating business outcomes by enhancing the performance of their people, including assessment and optimized deployment, as well as the design, alignment, and benchmarking of compensation to business strategy and performance outcomes. Further, the company develops, markets, and administers customized insurance programs and specialty market solutions for organizations, and their members or affiliates; operates the Global Risk Insight Platform, which provides data, analytics, engagement, and consulting services; offers CoverWallet, a digital insurance platform for small- and medium-sized businesses; and provides ReView that provides advisory, analysis, and benchmarking services to help reinsurers. Aon plc was founded in 1919 and is headquartered in Dublin, Ireland.

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