[Form 4] Arthur J. Gallagher & Co. Insider Trading Activity

Rhea-AI Filing Summary

Arthur J. Gallagher & Co. (AJG) reported insider buying by a Vice President on 11/03/2025. The officer made four open‑market purchases of common stock: 538 shares at a weighted average price of $245.853, 1,874 shares at $246.822, 989 shares at $247.415, and 599 shares at $248.717.

Following these trades, the officer directly holds 41,848.6557 shares. Indirect holdings include 59 shares by a child, 12,505 shares held by the spouse’s trust, and 418.699 shares in a Gallagher 401(k) plan account. Prices reflect weighted averages across multiple executions, with detailed breakdowns available upon request.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Pesch Michael Robert

(Last) (First) (Middle)

2850 GOLF ROAD

(Street)

ROLLING MEADOWS IL 60008

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Arthur J. Gallagher & Co. [ AJG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice President

3. Date of Earliest Transaction (Month/Day/Year)
11/03/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/03/2025		P		538	A	$245.853(1)	38,386.6557	D
Common Stock	11/03/2025		P		1,874	A	$246.822(2)	40,260.6557	D
Common Stock	11/03/2025		P		989	A	$247.415(3)	41,249.6557	D
Common Stock	11/03/2025		P		599	A	$248.717(4)	41,848.6557	D
Common Stock								59	I	By Child
Common Stock								12,505	I	By Spouse's Trust(5)
Common Stock								418.699	I	Gallagher 401(k) plan account

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

5. Shares held in irrevocable trust, of which his spouse is sole Trustee.

Remarks:

Exhibit List: Ex-24: Power of Attorney.

	/s/ Monica Norzagaray, by power of attorney	11/03/2025
	** Signature of Reporting Person	Date
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.

FAQ

What insider activity did AJG disclose?

A Vice President purchased common stock in four open‑market transactions on 11/03/2025 at weighted average prices between $245.853 and $248.717.

How many AJG shares were bought in each trade?

The officer bought 538, 1,874, 989, and 599 shares.

What is the officer’s direct AJG ownership after the trades?

Direct beneficial ownership is 41,848.6557 shares.

What indirect AJG holdings are reported?

Indirect holdings include 59 shares by a child, 12,505 via the spouse’s trust, and 418.699 in a Gallagher 401(k) account.

Were these prices single fills or averages?

They are weighted average prices from multiple executions; full trade details are available upon request.

What was the transaction date for all purchases?

All purchases occurred on 11/03/2025.