# EDGAR Filing Document

**Accession Number:** 0000354190
**File Stem:** 0000354190-26-000163
**Filing Date:** 2026-5
**Character Count:** 9853
**Document Hash:** bdf5ab886d5740888e9cd33b5c8ed2f7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000354190-26-000163.hdr.sgml**: 20260528

**ACCESSION NUMBER**: 0000354190-26-000163

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260526

**FILED AS OF DATE**: 20260528

**DATE AS OF CHANGE**: 20260528

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Gallagher Patrick Murphy
- **CENTRAL INDEX KEY:** 0001929606

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-09761
- **FILM NUMBER:** 261038649

**MAIL ADDRESS:**
- **STREET 1:** 2850 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Arthur J. Gallagher & Co.
- **CENTRAL INDEX KEY:** 0000354190
- **STANDARD INDUSTRIAL CLASSIFICATION:** INSURANCE AGENTS BROKERS & SERVICES [6411]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 362151613
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 2850 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008-4050
- **BUSINESS PHONE:** 630-773-3800

**MAIL ADDRESS:**
- **STREET 1:** 2850 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008-4050

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ARTHUR J. GALLAGHER & CO.
- **DATE OF NAME CHANGE:** 20190819

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GALLAGHER ARTHUR J & CO
- **DATE OF NAME CHANGE:** 19920703

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Gallagher Patrick Murphy<br><sub>(Last) (First) (Middle)</sub><br>2850 GOLF ROAD<br><sub>(Street)</sub><br>ROLLING MEADOWS, IL 60008<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-05-26 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chief Operating Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Arthur J. Gallagher & Co. [ AJG ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-05-26 |  | G |  | 14698 | A | $0 | 98105.25 | I | By Trust<sup>(1)</sup> |
| Common Stock |  |  |  |  |  |  |  | 11264 | I | By Spouse as Trustee<sup>(2)</sup> |
| Common Stock |  |  |  |  |  |  |  | 14167.56 | D |  |
| Common Stock |  |  |  |  |  |  |  | 491.136 | I | Gallagher 401(k) plan account |
| Common Stock |  |  |  |  |  |  |  | 77062 | I | By Spouse's Trust<sup>(3)</sup> |
| Common Stock |  |  |  |  |  |  |  | 21032 | I | By Trust<sup>(4)</sup> |
| Common Stock |  |  |  |  |  |  |  | 55109 | I | By Irrevocable Trust |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Non-qualified Stock Option | $228.20 |  |  |  |  |  |  | <sup>(5)</sup> | 2033-03-01 | Common Stock | 17775 |  | 17775 | D |  |
| Phantom Stock | <sup>(6)</sup> |  |  |  |  |  |  | <sup>(7)</sup> | <sup>(7)</sup> | Common Stock | 17660.851 |  | 17660.851 | D |  |
| Non-qualified Stock Option | 337.74<sup>(8)</sup> |  |  |  |  |  |  | <sup>(9)</sup> | 2032-03-01 | Common Stock | 11901 |  | 11901 | D |  |
| Non-qualified Stock Option | $243.54 |  |  |  |  |  |  | <sup>(10)</sup> | 2031-03-01 | Common Stock | 11386 |  | 11386 | D |  |
| Non-qualified Stock Option | $127.90 |  |  |  |  |  |  | <sup>(9)(11)</sup> | 2028-03-16 | Common Stock | 7255 |  | 7255 | D |  |
| Non-qualified Stock Option | $86.17 |  |  |  |  |  |  | <sup>(9)(12)</sup> | 2027-03-12 | Common Stock | 6270 |  | 6270 | D |  |
| Non-qualified Stock Option | $177.09 |  |  |  |  |  |  | <sup>(13)</sup> | 2030-03-15 | Common Stock | 6160 |  | 6160 | D |  |
| Non-qualified Stock Option | $158.56 |  |  |  |  |  |  | <sup>(9)(14)</sup> | 2029-03-15 | Common Stock | 5510 |  | 5510 | D |  |
| Phantom Stock | <sup>(6)</sup> |  |  |  |  |  |  | <sup>(15)</sup> | <sup>(15)</sup> | Common Stock | 3804.562 |  | 3804.562 | D |  |
| Notional Stock Units | <sup>(16)</sup> |  |  |  |  |  |  | <sup>(17)</sup> | <sup>(18)</sup> | Common Stock | 2351.803 |  | 2351.803 | D |  |

---

### Footnotes:

(1) 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.

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

(3) 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

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

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

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

(7) 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.

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

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

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

(11) Grant date of 3/16/2021.

(12) Grant date of 3/12/2020.

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

(14) Grant date of 3/15/2022.

(15) 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.

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

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

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

**Signature:** /s/ Monica Norzagaray, by power of attorney  
**Date:** 2026-05-28

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**