Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionAPG Asset Management N.V.
Latest Disclosed Ownership1,177,502 shares
Latest Disclosed Value $ 221,336,038
APG Asset Management N.V. reports 0.45% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 13, 2026 - APG Asset Management N.V. filed a 13F-HR form disclosing ownership of 1,177,502 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $221,336,038 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,182,859 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -0.45% 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)
2026-05-13 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,177,502 -5,357 -0.45 221,336 -15.08 0.7013
2026-02-12 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,182,859 -15,019 -1.25 260,643 -17.46 0.7397
2025-11-12 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,197,878 10 0.00 315,771 -3.34 0.8863
2025-08-12 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,197,868 530,014 79.36 326,670 53.04 0.9673
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 667,854 319,820 91.89 213,451 123.74 0.6621
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 348,034 240,447 223.49 95,403 251.73 0.2657
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 107,587 -193,105 -64.22 27,124 -62.72 0.1800
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 300,692 19,657 6.99 72,752 11.82 0.1298
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 281,035 4,800 1.74 65,065 15.70 0.1140
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 276,235 23,010 9.09 56,235 -2.57 0.1097
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 253,225 1,000 0.40 57,718 13.70 0.1180
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 252,225 -19,700 -7.24 50,762 6.01 0.1024
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 271,925 -37,865 -12.22 47,883 82,455.17 0.1016
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 309,790 -416,307 -57.33 58 -99.95 0.1110
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 726,097 -205,768 -22.08 126,905 -12.68 0.3274
2022-08-12 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 931,865 -54,700 -5.54 145,326 -6.13 0.3406
2022-05-12 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 986,565 6,600 0.67 154,814 5.88 0.2925
2022-02-11 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 979,965 -46,800 -4.56 146,211 11.02 0.2484
2021-11-15 2021-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,026,765 15,800 1.56 131,696 10.28 0.2341
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,026,765 15,800 131,696 0.2367
2021-08-13 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,010,965 30,400 3.10 119,416 14.72 0.2028
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 980,565 202,207 25.98 104,097 32.27 0.1777
2021-02-12 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 778,358 439,803 129.91 78,698 158.18 0.1284
2020-11-12 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 338,555 101,251 42.67 30,482 47.99 0.0528
2020-08-14 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 237,304 17,900 8.16 20,598 15.18 0.0375
2020-05-19 2020-03-31 13F/A-2 GALLAGHER ARTHUR J COM 363576109 219,404 94,980 76.34 17,884 69.42 0.0351
2020-05-15 2020-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 219,404 0 17,884 0.0354
2020-02-13 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 124,424 600 0.48 10,556 3.76 0.0172
2019-11-08 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 123,824 123,824 10,173 0.0168
2019-02-13 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -8,500 -100.00 0 -100.00
2018-11-09 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 8,500 -1,100 -11.46 545 1.49 0.0010
2018-08-13 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 9,600 9,600 537 0.0010
2018-05-14 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -241,500 -100.00 0 -100.00
2018-02-21 2017-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 241,500 147,400 156.64 12,727 119.73 0.0233
2018-01-24 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 241,500 147,400 12,727
2017-10-19 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 94,100 94,100 5,792 0.0095
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.