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AJG · Arthur J. Gallagher & Co.

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Market Cap
$68.05B
Shares
256.30M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,299
Total Value: $54,970,089,010
Total Shares: 239,448,246
Showing 1–100 of 1,325 holdings by value · page 1 of 14

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,299 13F filers · Δ vs Mar 31, 2026
Top Holder
8.3%
Sep 2023 → Jun 2026 · range 8.3% – 13.8%
−0.2 pts
Top 5
34.3%
Sep 2023 → Jun 2026 · range 34.3% – 42.4%
−2.1 pts
Top 10
53.6%
Sep 2023 → Jun 2026 · range 51.3% – 58.9%
−0.7 pts
HHI
346
Sep 2023 → Jun 2026 · range 346 – 475
Broadly held−20

Quarterly Activity

vs Mar 31, 2026
New
162
Increased
465
Decreased
487
Sold Out
122
Unchanged
185
Holder count: +40
Institutional value: +10.1%
Shares held: +3.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,325
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 354190 CUSIP 363576109 13F (30d) 725 filings 685 filers Visit website Investor relations