Patrick Murphy Gallagher - 08 Sep 2026 Form 4 Insider Report for Arthur J. Gallagher & Co. (AJG)

Reporting relationship: Chief Operating Officer
Issuer ticker: AJG
Reported as of: 08 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 10 Sep 2026, 18:45:35 UTC
Prior SEC filing: 07 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Monica Norzagaray, by power of attorney

Key filing fact

Patrick Murphy Gallagher filed Form 4 for Arthur J. Gallagher & Co. (AJG) on 10 Sep 2026.

Key facts

This page summarizes Patrick Murphy Gallagher's Form 4 filing for Arthur J. Gallagher & Co. (AJG).
1 reported transaction and 10 derivative rows are listed below.
Accepted by SEC: 10 Sep 2026, 18:45.

Change

Previous filing in this sequence was filed on 07 Aug 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 0001929606 Primary reporting owner

Gallagher Patrick Murphy

Relationship: Chief Operating Officer
Address: 2850 GOLF ROAD, ROLLING MEADOWS
Signature: /s/ Monica Norzagaray, by power of attorney
Signature date: 10 Sep 2026

Reported non-derivative transactions

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

AJG transaction

Common Stock

Gift

Transaction value
Shares: +49,988
Change %: +51%
Price: $0.000000^*
Shares after: 148,093
Date: 08 Sep 2026
Ownership: By Trust
Footnotes: F1, F2

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 11,264
Date: 08 Sep 2026
Ownership: By Spouse as Trustee
Footnotes: F3

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 14,170
Date: 08 Sep 2026
Ownership: Direct

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 491
Date: 08 Sep 2026
Ownership: Gallagher 401(k) plan account

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 53,262
Date: 08 Sep 2026
Ownership: By Spouse's Trust
Footnotes: F4

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 21,032
Date: 08 Sep 2026
Ownership: By Trust
Footnotes: F5

AJG holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 55,109
Date: 08 Sep 2026
Ownership: By Irrevocable Trust

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: 17,775
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,775
Exercise price: $228.20
Footnotes: F6

AJG holding Derivative

Phantom Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 17,731
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,731
Exercise price
Footnotes: F7, F8

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 11,901
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,901
Exercise price: $337.74
Footnotes: F9, F10

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 11,386
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,386
Exercise price: $243.54
Footnotes: F11

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,255
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,255
Exercise price: $127.90
Footnotes: F10, F12

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 6,270
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,270
Exercise price: $86.17
Footnotes: F10, F13

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 6,160
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,160
Exercise price: $177.09
Footnotes: F14

AJG holding Derivative

Non-qualified Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,510
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,510
Exercise price: $158.56
Footnotes: F10, F15

AJG holding Derivative

Phantom Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 3,805
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,805
Exercise price
Footnotes: F7, F16

AJG holding Derivative

Notional Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2,352
Date: 08 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,352
Exercise price
Footnotes: F17, F18, F19

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 19 footnotes

Footnote F1

This transaction represents a gift from the reporting person's father to an irrevocable trust of which the reporting person and his siblings are beneficiaries, and the reporting person is the acting trustee. The reporting person disclaims beneficial ownership of the shares held by the trust except to the extent of his pecuniary interest therein.

Footnote F2

Shares held in trust for the benefit of the reporting person and immediate family members, of which he and his immediate family members, as applicable, is a trustee.

Footnote F3

Shares held in trusts, for the benefit of the reporting person's children, of which his wife is sole trustee.

Footnote F4

Shares held in a revocable trust and an irrevocable trust of which the reporting person's spouse is sole Trustee and as to which he disclaims beneficial ownership

Footnote F5

Shares held in trust for the benefit of the reporting person's children, of which he is a trustee.

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

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

Footnote F8

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 F9

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

Footnote F10

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

Footnote F11

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

Footnote F12

Grant date of 3/16/2021.

Footnote F13

Grant date of 3/12/2020.

Footnote F14

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

Footnote F15

Grant date of 3/15/2022.

Footnote F16

These shares represent awards under the Deferred Cash Participation Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the participant. These awards are payable in a lump sum on the six-month anniversary of the reporting person's separation from service.

Footnote F17

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

Footnote F18

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

Footnote F19

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

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