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Arthur J. Gallagher & Co. is the issuer of common stock for which Capital World Investors reported beneficial ownership of 13,024,896 shares, equal to 5.1%, as of September 30, 2026. Capital World Investors reported sole voting power over 12,787,059 shares and sole dispositive power over 13,024,896 shares.
Key Figures
Beneficial ownership:13,024,896 sharesPercent of class:5.1%Sole voting power:12,787,059 shares+2 more
5 metrics
Beneficial ownership13,024,896 sharesCapital World Investors reported this position as of September 30, 2026.
Percent of class5.1%Reported beneficial ownership as of September 30, 2026.
Sole voting power12,787,059 sharesReported by Capital World Investors for the September 30, 2026 event date.
Sole dispositive power13,024,896 sharesReported by Capital World Investors for the September 30, 2026 event date.
Shares believed outstanding256,300,000 sharesDenominator cited for the reported 5.1% ownership.
Key Terms
beneficial owner, Sole Voting Power, Sole Dispositive Power
3 terms
beneficial ownerregulatory
"deemed to be the beneficial owner of 13,024,896 shares"
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 Powerregulatory
"Sole Voting Power 12,787,059.00"
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.
Sole Dispositive Powerregulatory
"Sole Dispositive Power 13,024,896.00"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many AJG shares does Capital World Investors beneficially own?
Capital World Investors reported beneficial ownership of 13,024,896 Arthur J. Gallagher & Co. common shares, representing 5.1% of the class. The statement identifies September 30, 2026, as the event date.
How much voting and dispositive power did Capital World Investors report over AJG shares?
Capital World Investors reported sole voting power over 12,787,059 shares and sole dispositive power over 13,024,896 shares. It reported zero shared voting power and zero shared dispositive power.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Arthur J. Gallagher & Co.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
363576109
(CUSIP Number)
09/30/2026
(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
12,787,059.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
13,024,896.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
13,024,896.00
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)
5.1 %
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 Number(s):
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:
13,024,896 **
**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 13,024,896 shares or 5.1% of the 256,300,000 shares believed to be outstanding.
(b)
Percent of class:
5.1 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
12,787,059
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
13,024,896
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
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
