Thomas Joseph Gallagher - 15 Mar 2026 Form 4 Insider Report for Arthur J. Gallagher & Co. (AJG)

Reporting relationship: President
Issuer ticker: AJG
Reported as of: 15 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Mar 2026, 21:35:01 UTC
Prior SEC filing: 06 Mar 2026
Next SEC filing: 24 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Monica Norzagaray, by power of attorney

Key filing fact

Thomas Joseph Gallagher filed Form 4 for Arthur J. Gallagher & Co. (AJG) on 17 Mar 2026.

Key facts

This page summarizes Thomas Joseph Gallagher's Form 4 filing for Arthur J. Gallagher & Co. (AJG).
4 reported transactions and 9 derivative rows are listed below.
Accepted by SEC: 17 Mar 2026, 21:35.

Change

Previous filing in this sequence was filed on 06 Mar 2026.
Current net transaction value: $0.

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 0001589933 Primary reporting owner

GALLAGHER THOMAS JOSEPH

Relationship: President
Address: 2850 GOLF ROAD, ROLLING MEADOWS
Signature: /s/ Monica Norzagaray, by power of attorney
Signature date: 17 Mar 2026

Reported non-derivative transactions

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

AJG transaction

Common Stock (restricted)

Award

Transaction value
Shares: +9,560
Change %
Price: $0.000000^*
Shares after: 9,560
Date: 15 Mar 2026
Ownership: Direct
Footnotes: F1

AJG transaction

Common Stock (restricted)

Options Exercise

Transaction value
Shares: -9,560
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 Mar 2026
Ownership: Direct

AJG transaction

Common Stock

Options Exercise

Transaction value
Shares: +9,560
Change %: +3%
Price: $0.000000^*
Shares after: 328,251
Date: 15 Mar 2026
Ownership: Direct

AJG transaction

Common Stock

Tax liability

Transaction value
Shares: -4,068
Change %: -1.2%
Price: $207.93^*
Shares after: 324,183
Date: 15 Mar 2026
Ownership: Direct

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 62,295
Date: 15 Mar 2026
Ownership: By grantor retained annuity trust

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 96,709
Date: 15 Mar 2026
Ownership: By Irrevocable Trust

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 32,428
Date: 15 Mar 2026
Ownership: By wife

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 119,175
Date: 15 Mar 2026
Ownership: By wife as trustee
Footnotes: F2, F3

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 491
Date: 15 Mar 2026
Ownership: Gallagher 401(k) plan account

Reported derivative securities

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

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 32,895
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 32,895
Exercise price: $127.90
Footnotes: F4

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 31,340
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 31,340
Exercise price: $86.17
Footnotes: F4

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 22,219
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,219
Exercise price: $228.20
Footnotes: F5

AJG holding Derivative

Phantom Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 20,232
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 20,232
Exercise price
Footnotes: F6, F7

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 15,310
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 15,310
Exercise price: $158.56
Footnotes: F4

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 15,070
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 15,070
Exercise price: $243.54
Footnotes: F8

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 14,876
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 14,876
Exercise price: $337.74
Footnotes: F4, F9

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 12,744
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 12,744
Exercise price: $177.09
Footnotes: F10

AJG holding Derivative

Notional Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 11,446
Date: 15 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,446
Exercise price: $0.000000
Footnotes: F11, F12

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 12 footnotes

Footnote F1

Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026.

Footnote F2

The reporting person disclaims beneficial ownership of these shares, and this report shall not be deemed an admission that the reporting person is the beneficial owner of these shares for purposes of Section 16 or for any other purpose.

Footnote F3

These shares are held in trusts, for the benefit of the reporting person's children, of which his wife is a trustee.

Footnote F4

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

Footnote F5

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

Footnote F6

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

Footnote F7

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 F8

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

Footnote F9

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

Footnote F10

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

Footnote F11

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

Footnote F12

Portions of these notional stock units are payable to the reporting person in shares of common stock in July of 2025 and 2026 and following the reporting person's separation from service.

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