Christopher E. Mead - 19 Aug 2026 Form 4 Insider Report for Arthur J. Gallagher & Co. (AJG)

Reporting relationship: VICE PRESIDENT
Issuer ticker: AJG
Reported as of: 19 Aug 2026
Net transaction value: -$899,588
SEC form: 4
Accepted by SEC: 20 Aug 2026, 19:12:09 UTC
Prior SEC filing: 17 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Monica Norzagaray, by power of attorney

Key filing fact

Christopher E. Mead filed Form 4 for Arthur J. Gallagher & Co. (AJG) on 20 Aug 2026.

Key facts

This page summarizes Christopher E. Mead's Form 4 filing for Arthur J. Gallagher & Co. (AJG).
3 reported transactions and 9 derivative rows are listed below.
Accepted by SEC: 20 Aug 2026, 19:12.

Change

Previous filing in this sequence was filed on 17 Mar 2026.
Current net transaction value: -$899,588.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001737644 Primary reporting owner

Mead Christopher E

Relationship: VICE PRESIDENT
Address: 2850 GOLF ROAD, ROLLING MEADOWS
Signature: /s/ Monica Norzagaray, by power of attorney
Signature date: 20 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AJG transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,500
Change %: +16%
Price: $86.17^*
Shares after: 25,723
Date: 19 Aug 2026
Ownership: Direct

AJG transaction

Common Stock

Sale

Transaction value: $899,588
Shares: -3,500
Change %: -14%
Price: $257.02
Shares after: 22,223
Date: 19 Aug 2026
Ownership: Direct

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 491
Date: 19 Aug 2026
Ownership: Gallagher 401(k) plan account

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AJG transaction Derivative

Non-qualified Stock Option

Options Exercise

Transaction value
Shares: -3,500
Change %: -32%
Price: $0.000000^*
Shares after: 7,590
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,500
Exercise price: $86.17
Footnotes: F1

AJG holding Derivative

Phantom Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 21,943
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 21,943
Exercise price
Footnotes: F2, F3

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 12,344
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 12,344
Exercise price: $228.20
Footnotes: F4

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 11,725
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,725
Exercise price: $127.90
Footnotes: F1

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,420
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,420
Exercise price: $158.56
Footnotes: F1

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,264
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,264
Exercise price: $337.74
Footnotes: F1, F5

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,368
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,368
Exercise price: $243.54
Footnotes: F6

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,009
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,009
Exercise price: $177.09
Footnotes: F7

AJG holding Derivative

Notional Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,983
Date: 19 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,983
Exercise price
Footnotes: F8, F9

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 9 footnotes

Footnote F1

One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Footnote F2

Each share of phantom stock represents a right to receive one share of Gallagher common stock.

Footnote F3

These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61.

Footnote F4

One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Footnote F5

Closing price of Gallagher common stock on February 28, 2025.

Footnote F6

One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Footnote F7

One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Footnote F8

Each notional stock unit represents a right to receive one share of Gallagher common stock.

Footnote F9

The notional stock units become payable in July 2026 and following the reporting person's separation from service with Gallagher.