Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionJustInvest LLC
Latest Disclosed Ownership27,599 shares
Latest Disclosed Value $ 5,977,391
JustInvest LLC reports 2.69% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - JustInvest LLC filed a 13F-HR form disclosing ownership of 27,599 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $5,977,391 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 26,876 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 2.69% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 27,599 723 2.69 5,977 -14.06 0.0587
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 26,876 -1,830 -6.37 6,955 -21.77 0.0679
2025-10-31 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 28,706 746 2.67 8,892 -0.67 0.0911
2025-07-25 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 27,960 3,590 14.73 8,951 6.39 0.1010
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 24,370 2,208 9.96 8,413 33.75 0.1241
2025-02-10 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 22,162 1,016 4.80 6,291 5.73 0.0950
2024-11-12 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 21,146 2,679 14.51 5,950 24.33 0.0958
2024-08-12 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 18,467 1,451 8.53 4,786 12.48 0.0911
2024-05-09 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 17,016 2,401 16.43 4,255 29.46 0.0913
2024-02-08 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 14,615 618 4.42 3,287 3.01 0.0853
2023-11-08 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 13,997 1,412 11.22 3,190 15.45 0.0954
2023-07-28 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,585 1,582 14.38 2,763 31.26 0.0847
2023-05-10 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,003 1,074 10.82 2,105 12.45 0.0731
2023-02-10 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 9,929 872 9.63 1,872 20.70 0.0772
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 9,057 1,704 23.17 1,551 29.36 0.0701
2022-08-12 2022-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 7,353 1,729 30.74 1,199 22.10 0.0555
2022-08-09 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 7,353 1,729 1,199 0.0555
2022-05-16 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 5,624 876 18.45 982 21.84 0.0475
2022-02-23 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,748 1,148 31.89 806 50.65 0.0475
2021-11-09 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 3,600 226 6.70 535 13.11 0.0481
2021-08-11 2021-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 3,374 1,205 55.56 473 74.54 0.0495
2021-07-21 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,169 0 271 0.0412
2021-04-28 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,169 2,169 271 0.0410
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.