Arthur J. Gallagher (AJG): Capital World Investors discloses 5% ownership stake

Rhea-AI Filing Summary

Capital World Investors, a division of Capital Research and Management Company and affiliated investment management entities, reports beneficial ownership of 12,769,747 shares of Arthur J. Gallagher & Co. common stock, representing 5.0% of the 256,900,000 shares believed to be outstanding as of June 30, 2026.

Capital World Investors has sole voting powersole dispositive power

Key Figures

Beneficially owned shares: 12,769,747 shares Percent of class: 5.0% Shares outstanding baseline: 256,900,000 shares +2 more

5 metrics

Beneficially owned shares 12,769,747 shares Capital World Investors’ reported beneficial ownership of Arthur J. Gallagher & Co. common stock

Percent of class 5.0% Portion of Arthur J. Gallagher & Co. common stock beneficially owned by Capital World Investors

Shares outstanding baseline 256,900,000 shares Shares of Arthur J. Gallagher & Co. common stock believed to be outstanding for ownership calculation

Sole voting power 12,543,497 shares Shares for which Capital World Investors has sole power to vote or direct the vote

Sole dispositive power 12,769,747 shares Shares for which Capital World Investors has sole power to dispose or direct disposition

Key Terms

beneficial owner, sole voting power, dispositive power, percent of class, +1 more

5 terms

beneficial owner financial

"CWI is deemed to be the beneficial owner of 12,769,747 shares or 5.0%"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Sole power to vote or to direct the vote: 12,543,497"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole power to dispose or to direct the disposition of: 12,769,747"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

percent of class financial

"Percent of class: 5.0 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Schedule 13G regulatory

"Capital World Investors 2 | 4 | Citizenship or Place of Organization DELAWARE ... SCHEDULE 13G/A"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

How many Arthur J. Gallagher (AJG) shares does Capital World Investors own?

Capital World Investors is deemed the beneficial owner of 12,769,747 shares of Arthur J. Gallagher & Co. common stock, according to the Schedule 13G/A amendment describing its ownership position and related voting and dispositive powers.

What percentage of Arthur J. Gallagher (AJG) does Capital World Investors hold?

Capital World Investors reports holding 5.0% of the 256,900,000 shares of Arthur J. Gallagher & Co. common stock believed to be outstanding, based on its disclosed beneficial ownership in the Schedule 13G/A filing.

What voting power does Capital World Investors report in AJG?

Capital World Investors reports sole voting power over 12,543,497 shares of Arthur J. Gallagher & Co. common stock and no shared voting power, reflecting how it can vote or direct the vote of those shares.

What dispositive power does Capital World Investors have over AJG shares?

Capital World Investors reports sole dispositive power over 12,769,747 shares of Arthur J. Gallagher & Co. common stock and no shared dispositive power, indicating control over the disposition of those shares.

Who signed the Arthur J. Gallagher (AJG) Schedule 13G/A for Capital World Investors?

The Schedule 13G/A was signed by Timothy J. Moon, Vice President and Senior Counsel of Capital Research and Management Company, on August 11, 2026, certifying the reported ownership information.

What is the reference share count for Arthur J. Gallagher (AJG) in this 13G/A?

The filing states that Capital World Investors’ 5.0% beneficial ownership is based on 256,900,000 shares of Arthur J. Gallagher & Co. common stock believed to be outstanding for the ownership calculation.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Arthur J. Gallagher & Co.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

363576109

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 363576109

1

Names of Reporting Persons

Capital World Investors

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 12,543,497.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 12,769,747.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

12,769,747.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Arthur J. Gallagher & Co.
(b)	Address of issuer's principal executive offices: 2850 Golf Road, Rolling Meadows, IL 60008-4050
Item 2.
(a)	Name of person filing: Capital World Investors
(b)	Address or principal business office or, if none, residence: 333 SOUTH HOPE STREET, 55TH FLOOR, LOS ANGELES, CALIFORNIA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 363576109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 12,769,747 ** **Capital World Investors ("CWI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CWI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital World Investors." CWI is deemed to be the beneficial owner of 12,769,747 shares or 5.0% of the 256,900,000 shares believed to be outstanding.
(b)	Percent of class: 5.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 12,543,497
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 12,769,747
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Capital World Investors

Signature:	Timothy J. Moon
Name/Title:	Vice President and Senior Counsel, Capital Research and Management Company
Date:	08/11/2026