Arthur J. Gallagher (AJG) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Arthur J. Gallagher & Co. (AJG) insider buying and selling: 1 purchase, 17 sales
139 Form 4 Table I transactions filed with the SEC by Arthur J. Gallagher & Co. insiders between 2025-09-03 and 2026-09-17 (15-month history): 1 open-market purchase and 17 sales, plus 121 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $6.3M by Gallagher J Patrick Jr on 2026-03-02.
Arthur J. Gallagher insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Arthur J. Gallagher insiders filed 1 purchase worth $988k and 13 sales worth $24.5M on the open market. The net balance is on the sell side: $23.5M more sold than bought.
The biggest buyer was Pesch Michael Robert (Vice President): $988k in 1 purchase, the only buyer. The biggest seller was Bay Walter D. (General Counsel): $7.3M in 2 sales, out of 6 different sellers.
The largest trade of the period was a sale of $6.3M on Mar 2, 2026, by Gallagher J Patrick Jr (CEO). Form 4 on sec.gov (0000354190-26-000034).
None of the 13 sales carries the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead).
The last three months show 0 purchases and 4 sales, against 0 and 1 in the three before. The latest purchase is from Nov 3, 2025; the latest sale from Sep 15, 2026.
Against its sector (Financial Services, 70 companies with an insider page on this site), over the same dates the median is 10 sales and 0 purchases on the open market. Arthur J. Gallagher has more sales than 41 of the other 69, ranks 33 of 70 by net dollars sold, and 32 of the 70 have at least one purchase, Arthur J. Gallagher included.
The 20 most important trades
The only open-market purchase first, then the rest, each type from largest to smallest. The full history is in the tool above, already searched.
See all 139 AJG trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2025-11-03 | 2025-11-03 | Pesch Michael Robert | Vice President | $988k | P — Open-market purchase4 Form 4 footnotesF1 The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $245.120 to $246.050. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. F2 The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $246.160 to $247.120. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. F3 The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $247.170 to $248.040. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. F4 The price reported is an average weighted price. The shares were purchased in multiple transactions on 11/3/2025 at prices ranging from $248.290 to $248.970. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2026-03-02 | 2026-03-04 | Gallagher J Patrick Jr | CEO | $6.3M | S — Open-market sale2 Form 4 footnotesF1 Covers tax obligations and the exercise price relating to the exercise of expiring stock options. F2 The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $230.210 to $230.780. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. | SEC |
| 2025-12-19 | 2025-12-23 | Bay Walter D. | General Counsel | $4.0M | S — Open-market sale | SEC |
| 2025-09-08 | 2025-09-09 | Hudson Scott R | Vice President | $3.8M | S — Open-market sale | SEC |
| 2026-08-24 | 2026-08-26 | Bay Walter D. | General Counsel | $3.2M | S — Open-market saleForm 4 footnoteF1 The price reported is an average weighted price. The shares were sold in multiple transactions on 8/24/2026 at prices ranging from $270.01 to $270.17. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. | SEC |
| 2026-09-02 | 2026-09-04 | Hudson Scott R | Vice President | $3.2M | S — Open-market saleForm 4 footnoteF1 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/2/2026 at prices ranging from $263.894 to $264.15. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2025-09-22 | 2025-09-23 | Howell Douglas K | VP & Chief Financial Officer | $2.4M | S — Open-market sale2 Form 4 footnotesF3 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/22/2025 at prices ranging from $298.780 to $299.770. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. F4 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/22/2025 at prices ranging from $299.790 to $299.940. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2025-09-19 | 2025-09-23 | Howell Douglas K | VP & Chief Financial Officer | $1.8M | S — Open-market sale2 Form 4 footnotesF1 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/19/2025 at prices ranging from $298.040 to $298.990. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. F2 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/19/2025 at prices ranging from $299.100 to $299.950. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2025-11-18 | 2025-11-20 | Cary Richard C | Controller, CAO | $1.6M | S — Open-market sale | SEC |
| 2025-12-22 | 2025-12-29 | Howell Douglas K | VP & Chief Financial Officer | $1.3M | S — Open-market sale2 Form 4 footnotesF1 This report discloses a sale of shares to cover tax obligations relating to the distribution of 35,739 deferred shares under the company's Supplemental Savings and Thrift Plan (reported on August 4, 2025). In lieu of withholding for taxes, the reporting person was required to receive the full distribution of shares and subsequently sell a portion of such shares to cover his tax obligation. F2 The price reported is an average weighted price. The shares were sold in multiple transactions on 12/22/2025 at prices ranging from $257.730 to $258.250. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2025-12-23 | 2025-12-29 | Mead Christopher E | VICE PRESIDENT | $1.0M | S — Open-market saleForm 4 footnoteF1 The price reported is an average weighted price. The shares were sold in multiple transactions on 12/23/2025 at prices ranging from $258.000 to $258.600. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2026-03-05 | 2026-03-09 | Mead Christopher E | VICE PRESIDENT | $908k | S — Open-market sale2 Form 4 footnotesF1 Exercise and sale of expiring stock options. F2 The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $$227.050 - $227.580. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. | SEC |
| 2026-08-19 | 2026-08-20 | Mead Christopher E | VICE PRESIDENT | $900k | S — Open-market sale | SEC |
| 2025-09-09 | 2025-09-11 | Howell Douglas K | VP & Chief Financial Officer | $899k | S — Open-market saleForm 4 footnoteF1 The price reported is an average weighted price. The shares were sold in multiple transactions on 9/9/2025 at prices ranging from $299.47 to $299.89. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4. | SEC |
| 2026-03-06 | 2026-03-09 | Hudson Scott R | Vice President | $865k | S — Open-market saleForm 4 footnoteF1 Exercise and sale of expiring stock options. | SEC |
| 2026-06-02 | 2026-06-02 | Cary Richard C | Controller, CAO | $618k | S — Open-market sale | SEC |
| 2025-11-21 | 2025-11-25 | Mead Christopher E | VICE PRESIDENT | $313k | S — Open-market sale | SEC |
| 2026-09-15 | 2026-09-17 | Cary Richard C | Controller, CAO | $253k | S — Open-market sale | SEC |
| 2026-03-15 | 2026-03-17 | Gallagher J Patrick Jr | CEO | $4.0M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-26 | 2026-03-02 | Gallagher Thomas Joseph | President | $3.9M | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF1 Represents the number of shares withheld by the Company as a result of the net exercise of stock options and used to pay the exercise price and required tax withholdings. | SEC |
The period balance: money in, money out
Across the Form 4 filings submitted between Sep 3, 2025 and Sep 17, 2026, Arthur J. Gallagher & Co. open-market activity adds up to 1 purchase worth $988k and 17 sales worth $33.4M. The net balance is $32.4M on the sell side.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Arthur J. Gallagher & Co.'s is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| M | Option exercise | 47 | $14.8M |
| F | Tax withholding (shares surrendered for taxes) | 30 | $18.1M |
| A | Grant or award | 28 | $395k |
| S | Open-market sale | 17 | $33.4M |
| G | Gift | 16 | $0 |
| P | Open-market purchase | 1 | $988k |
| Total | Everything filed in the period | 139 | $67.7M |
58 of the 139 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 21 distinct people or entities have filed Arthur J. Gallagher & Co. transactions: 1 bought on the open market and 6 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
Of the 6 who sold on the open market (17 sales in all), the three biggest sellers account for $21.5M of the $33.4M: 64% of the money in three people.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Hudson Scott R | Vice President | 12 | — | $7.9M (3) | 2026-09-04 |
| Bay Walter D. | General Counsel | 10 | — | $7.3M (2) | 2026-08-26 |
| Howell Douglas K | VP & Chief Financial Officer | 13 | — | $6.4M (4) | 2026-04-02 |
| Gallagher J Patrick Jr | CEO | 12 | — | $6.3M (1) | 2026-09-10 |
| Mead Christopher E | VICE PRESIDENT | 13 | — | $3.2M (4) | 2026-08-20 |
| Cary Richard C | Controller, CAO | 6 | — | $2.4M (3) | 2026-09-17 |
| Pesch Michael Robert | Vice President | 6 | $988k (1) | — | 2026-07-06 |
| Gallagher Patrick Murphy | Chief Operating Officer | 12 | — | — | 2026-09-10 |
Shown here are the 8 who moved the most money, out of 21. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Sep 2025: 0 purchases and 4 sales, worth $8.9M. 8 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 4 | $8.9M |
| Oct 2025 | 0 | $0 | 0 | $0 |
| Nov 2025 | 1 | $988k | 2 | $1.9M |
| Dec 2025 | 0 | $0 | 3 | $6.4M |
| Jan 2026 | 0 | $0 | 0 | $0 |
| Feb 2026 | 0 | $0 | 0 | $0 |
| Mar 2026 | 0 | $0 | 3 | $8.1M |
| Apr 2026 | 0 | $0 | 0 | $0 |
| May 2026 | 0 | $0 | 0 | $0 |
| Jun 2026 | 0 | $0 | 1 | $618k |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 2 | $4.1M |
| Sep 2026 | 0 | $0 | 2 | $3.4M |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Arthur J. Gallagher & Co. (AJG) analysis page →
Other Financial Services companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
None of the 17 sales in the table is flagged as scheduled (10b5-1 plan), the kind signed months ahead and executed automatically. Arthur J. Gallagher's single open-market purchase (code P) is the rare signal: insiders are already paid in stock, so buying more means putting in their own money. The latest filing is from Sep 17, 2026, and a Form 4 arrives up to two business days after the trade.
12 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.