Arthur J. Gallagher & Co. AJG
Arthur J. Gallagher & Co. is the 180th largest S&P 500 company by market cap, worth $68.7 billion. 9 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 12 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 12.4% of the company.
- CEO
- J. Patrick Gallagher Jr.
- Sector
- Financials
- Sub-industry
- Insurance Brokers
- Headquarters
- Rolling Meadows, Illinois
- Founded
- 1927
- More
- Wikipedia
- Market cap
- $68.7B
- 180th largest, 23 Oct 2026 close
- Price to sales
- 4.9
- Market cap over revenue
- Market cap per employee
- $954K
- Market cap over employees
- Connections
- 2
- S&P 500 companies sharing a director or officer
Largest institutional holders
Each fund group's share of Arthur J. Gallagher & Co.. Where a company has several share classes, the share is of its total value.
13F filings for the quarter to 30 Jun 2026
Board and officers
2 people here also hold roles at other S&P 500 companies.
Roles filed up to 30 Sep 2026
| Name | Title |
|---|---|
| Directors (9) | |
| J. Patrick Gallagher Jr.CEO | |
| Deborah H. CaplanDirectorAlso at Mid-America Apartment Communities | |
| Teresa Hillary ClarkeDirectorAlso at American Tower | |
| David John ColdmanDirector | |
| Richard de Winton Wilkin HarriesDirector | |
| David S. JohnsonDirector | |
| Christopher C. MiskelDirector | |
| Ralph J. NicolettiDirector | |
| Norman L. RosenthalDirector | |
| Officers (12) | |
| Douglas K. HowellVP & Chief Financial OfficerLast filed 24 Jun 2026 | |
| Walter D. BayGeneral CounselLast filed 26 Aug 2026 | |
| Mark H. BloomVice PresidentLast filed 18 Aug 2026 | |
| Richard C. CaryController, CAOLast filed 17 Sep 2026 | |
| Patrick Murphy GallagherChief Operating OfficerLast filed 10 Sep 2026 | |
| Thomas Joseph GallagherPresidentLast filed 6 Jul 2026 | |
| Scott R. HudsonVice PresidentLast filed 4 Sep 2026 | |
| Vishal JainVice PresidentLast filed 6 Jul 2026 | |
| Christopher E. MeadVice PresidentLast filed 20 Aug 2026 | |
| Michael Robert PeschVice PresidentLast filed 6 Jul 2026 | |
| Susan E. PietruchaChief Human Resources OfficerLast filed 17 Mar 2026 | |
| William F. ZiebellVice PresidentLast filed 2 Apr 2026 | |
Companies that share people with Arthur J. Gallagher & Co.
Each person's title here, then at the other company.
- American Tower AMT
- Teresa Hillary Clarke: Director here, Director there
- Mid-America Apartment Communities MAA
- Deborah H. Caplan: Director here, Director there
Arthur J. Gallagher & Co.'s market cap since December 2008
Marked weeks are changes in the share count, such as a merger, not market moves.
Weekly, up to 23 Oct 2026
| Week ending | Market cap |
|---|---|
| 23 Oct 2026 | $68.7B |
| 26 Dec 2025 | $67.2B |
| 27 Dec 2024 | $62.9B |
| 29 Dec 2023 | $48.5B |
| 30 Dec 2022 | $39.8B |
| 31 Dec 2021 | $35.2B |
| 25 Dec 2020 | $23.7B |
| 27 Dec 2019 | $17.7B |
| 28 Dec 2018 | $13.3B |
| 29 Dec 2017 | $11.4B |
| 30 Dec 2016 | $9.3B |
| 25 Dec 2015 | $7.3B |
| 26 Dec 2014 | $7.7B |
| 27 Dec 2013 | $6.1B |
| 28 Dec 2012 | $4.3B |
| 30 Dec 2011 | $3.8B |
| 31 Dec 2010 | $3.1B |
| 25 Dec 2009 | $2.3B |
| 26 Dec 2008 | $2.6B |
Download Arthur J. Gallagher & Co.'s data as JSON, with the weekly market caps in billions of dollars from 5 Dec 2008.
Workforce
Headcount at 31 Dec 2025
- Employees
- 72,000
As of December 31, 2025, we had approximately 72,000 employees, with approximately 47% in the U.S. and 53% outside of the U.S.
Insider trades
Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.
Trades from 30 Sep 2025 to 30 Sep 2026
Directors and officers sold $24.5 million of stock in 13 sales and bought $988,490 in 1 purchase in the 12 months to 30 Sep 2026.
| Date | Person | Value |
|---|---|---|
| 15 Sep 2026Sale | Richard C. CaryController, CAO | $253K |
| 2 Sep 2026Sale | Scott R. HudsonVice President | $3.2M |
| 24 Aug 2026Sale | Walter D. BayGeneral Counsel | $3.2M |
| 19 Aug 2026Sale | Christopher E. MeadVice President | $900K |
| 2 Jun 2026Sale | Richard C. CaryController, CAO | $618K |
| 6 Mar 2026Sale | Scott R. HudsonVice President | $865K |
| 5 Mar 2026Sale | Christopher E. MeadVice President | $908K |
| 2 Mar 2026Sale | J. Patrick Gallagher Jr.CEO | $6.3M |
| 23 Dec 2025Sale | Christopher E. MeadVice President | $1.0M |
| 22 Dec 2025Sale | Douglas K. HowellVP & Chief Financial Officer | $1.3M |
Showing 10 of 14 trades
Trades by members of Congress and officials
Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.
Trades from 20 Oct 2023 to 20 Oct 2026
10 people disclosed 21 purchases and 14 sales of Arthur J. Gallagher & Co. stock since October 2023.
| Date | Member or official | Amount |
|---|---|---|
| 25 Aug 2026 | Michael T. McCaulHouse, R-TX 路 Sold | $1K to $15K |
| 10 Jun 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $1K to $15K |
| 3 Jun 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $1K to $15K |
| 2 Jun 2026 | Rohit KhannaHouse, D-CA 路 Bought | $1K to $15K |
| 20 May 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $15K to $50K |
| 8 May 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $1K to $15K |
| 6 Apr 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $15K to $50K |
| 27 Mar 2026 | Alan ArmstrongSenate, R-OK 路 Bought | $1K to $15K |
| 25 Mar 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $15K to $50K |
| 12 Mar 2026 | Michael T. McCaulHouse, R-TX 路 Bought | $15K to $50K |
Showing 10 of 35 trades
Not on file: no WARN layoff notices under its own name since October 2023.