Company · Ownership research

Arthur J. Gallagher & Co. AJG

CIK 0000354190 · CUSIP 363576109

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 363576109 (AJG), not CUSIP 363576909 (AJG), CUSIP 363576959 (AJG), and does not merge CUSIPs.

This page lists the top 20 of 1,249 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$4.23B 19,568,047 shares	0.29%	-745.20K(-3.70%)Reduced	SEC filing ↗ May 13, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$4.18B 19,307,796 shares	0.07%	+68.17K(+0.40%)Added	SEC filing ↗ May 13, 2026	▾
03	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$3.62B 16,699,898 shares	0.09%	—	SEC filing ↗ May 15, 2026	▾
04	FMR LLC CIK 315066 · View history	$3.17B 14,620,963 shares	0.17%	-489.72K(-3.20%)Reduced	SEC filing ↗ May 15, 2026	▾
05	Capital World Investors CIK 1422849 · View history	$2.99B 13,817,720 shares	0.41%	+1.20M(+9.50%)Added	SEC filing ↗ May 13, 2026	▾
06	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$2.69B 12,419,279 shares	0.14%	—	SEC filing ↗ May 8, 2026	▾
07	STATE STREET CORP CIK 93751 · View history	$2.38B 10,973,921 shares	0.08%	+20.32K(+0.20%)Added	SEC filing ↗ May 15, 2026	▾
08	DODGE & COX CIK 200217 · View history	$1.59B 7,354,915 shares	0.88%	+6.47M(+735.20%)Added	SEC filing ↗ May 14, 2026	▾
09	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$1.35B 6,243,640 shares	0.08%	+229.44K(+3.80%)Added	SEC filing ↗ May 15, 2026	▾
10	MORGAN STANLEY CIK 895421 · View history	$878.49M 4,056,175 shares	0.05%	-3.72M(-47.80%)Reduced	SEC filing ↗ May 15, 2026	▾
11	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history	$702.18M 3,242,088 shares	0.38%	+409.14K(+14.40%)Added	SEC filing ↗ May 4, 2026	▾
12	Capital Research Global Investors CIK 1422848 · View history	$645.43M 2,980,131 shares	0.10%	+1.43M(+92.50%)Added	SEC filing ↗ May 13, 2026	▾
13	EAGLE CAPITAL MANAGEMENT LLC CIK 945631 · View history	$577.31M 2,665,572 shares	1.94%	+2.67MNew	SEC filing ↗ May 15, 2026	▾
14	Capital International Investors CIK 1562230 · View history	$562.33M 2,596,653 shares	0.13%	-3.68M(-58.70%)Reduced	SEC filing ↗ May 13, 2026	▾
15	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$559.50M 2,583,359 shares	0.10%	-382.62K(-12.90%)Reduced	SEC filing ↗ May 15, 2026	▾
16	GTCR LLC CIK 1576350 · View history	$514.11M 2,373,773 shares	13.60%	+2.37MNew	SEC filing ↗ May 15, 2026	▾
17	WCM INVESTMENT MANAGEMENT, LLC CIK 1061186 · View history	$510.18M 2,362,513 shares	1.16%	-17.78K(-0.70%)Reduced	SEC filing ↗ May 7, 2026	▾
18	NORTHERN TRUST CORP CIK 73124 · View history	$482.94M 2,229,829 shares	0.06%	-443(0.00%)Reduced	SEC filing ↗ May 14, 2026	▾
19	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$457.17M 2,109,463 shares	0.07%	+65.82K(+3.20%)Added	SEC filing ↗ May 15, 2026	▾
20	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$426.89M 1,970,990 shares	0.20%	+101.43K(+5.40%)Added	SEC filing ↗ May 18, 2026	▾

Showing 20 / 1,249 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

1,249

Cancelled or null records excluded

Disclosed shares

229,629,321

Not deduplicated across managers

Disclosed value

$49.66B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Arthur J. Gallagher & Co. · Q1 2026

Explore all 1,249 reporting institutions.

This page includes 20 of 1,249 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.