Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionLegal & General Group Plc
Latest Disclosed Ownership1,373,429 shares
Latest Disclosed Value $ 297,457,250
Legal & General Group Plc reports 0.26% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 8, 2026 - Legal & General Group Plc filed a 13F-HR form disclosing ownership of 1,373,429 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $297,457,250 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 1,369,877 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 0.26% 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)
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,373,429 3,552 0.26 297,457 -16.09 0.0369
2026-02-09 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,369,877 -15,825 -1.14 354,510 -17.40 0.0786
2025-11-13 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,385,702 69,208 5.26 429,207 1.84 0.0963
2025-08-12 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,316,494 6,896 0.53 421,436 -6.79 0.1046
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,309,598 22,212 1.73 452,126 23.73 0.1231
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,287,386 79,257 6.56 365,425 7.50 0.0967
2025-02-28 2024-09-30 13F/A-2 GALLAGHER ARTHUR J COM 363576109 1,208,129 -48,178 -3.83 339,931 4.35 0.0894
2024-11-14 2024-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,535,089 -105,849 431,928 0.0900
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,535,089 -105,849 431,928 0.0900
2025-05-29 2024-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,256,307 -41,299 -3.18 325,772 0.41 0.0920
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,640,938 42,841 425,511 0.0953
2025-05-29 2024-03-31 13F/A-2 GALLAGHER ARTHUR J COM 363576109 1,297,606 -13,368 -1.02 324,453 10.05 0.0934
2024-07-01 2024-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,598,097 -13,549 399,587 0.0933
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,586,575 -25,071 396,707 0.0477
2025-05-29 2023-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,310,974 -25,279 -1.89 294,812 -3.20 0.0916
2024-02-15 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,611,646 275,393 362,427 0.0930
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,336,253 -54,001 -3.88 304,573 -0.22 0.1063
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,390,254 21,605 1.58 305,258 16.58 0.0993
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,368,649 8,471 0.62 261,835 2.10 0.0937
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,360,178 -89,101 -6.15 256,451 3.34 0.0984
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,449,279 -79,825 -5.22 248,167 -0.46 0.0970
2022-08-22 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,529,104 75,601 5.20 249,309 -1.76 0.0882
2022-05-16 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,453,503 75,734 5.50 253,783 8.56 0.0772
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,377,769 -22,772 -1.63 233,767 12.29 0.0707
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,400,541 80,689 6.11 208,189 12.60 0.0677
2021-08-12 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,319,852 125,704 10.53 184,885 24.09 0.0618
2021-05-17 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,194,148 -19,315 -1.59 148,994 -0.75 0.0555
2021-02-12 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,213,463 19,915 1.67 150,117 19.13 0.0588
2020-11-13 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,193,548 -25,754 -2.11 126,015 6.01 0.0563
2020-08-14 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,219,302 -182,802 -13.04 118,869 3.92 0.0574
2020-05-14 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,402,104 77,938 5.89 114,383 -9.28 0.0669
2020-02-13 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,324,166 28,965 2.24 126,078 11.21 0.0601
2019-08-14 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,295,201 49,812 4.00 113,365 16.59 0.0610
2019-05-15 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,245,389 175,553 16.41 97,230 23.42 0.0555
2019-02-15 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,069,836 102,367 10.58 78,781 9.40 0.0610
2018-11-20 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 967,469 20,686 2.18 72,015 16.52 0.0515
2018-08-10 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 946,783 -26,805 -2.75 61,803 -7.61 0.0477
2018-05-17 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 973,588 18,739 1.96 66,897 10.71 0.0510
2018-02-13 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 954,849 -6,794 -0.71 60,424 2.09 0.0437
2017-11-09 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 961,643 64,288 7.16 59,189 15.21 0.0445
2017-08-03 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 897,355 59,507 7.10 51,373 8.44 0.0415
2017-05-12 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 837,848 36,905 4.61 47,373 13.83 0.0402
2017-02-13 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 800,943 29,074 3.77 41,617 5.99 0.0388
2016-10-12 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 771,869 34,497 4.68 39,264 11.88 0.0398
2016-08-16 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 737,372 50,022 7.28 35,095 14.79 0.0370
2016-05-16 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 687,350 31,839 4.86 30,574 13.92 0.0339
2016-02-16 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 655,511 40,171 6.53 26,838 5.67 0.0303
2015-11-13 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 615,340 57,683 10.34 25,399 -3.71 0.0310
2015-07-31 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 557,657 25,794 4.85 26,378 6.08 0.0310
2015-05-14 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 531,863 1,914 0.36 24,865 -0.35 0.0297
2015-02-20 2014-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 529,949 21,065 4.14 24,953 8.11 0.0294
2015-02-17 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 529,949 21,065 24,953 0.0307
2014-11-14 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 508,884 4,479 0.89 23,082 -1.80 0.0277
2014-08-13 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 504,405 25,314 5.28 23,505 3.11 0.0274
2014-05-14 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 479,091 6,391 1.35 22,795 2.75 0.0277
2014-02-07 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 472,700 2,136 0.45 22,184 8.00 0.0268
2013-11-12 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 470,564 8,564 1.85 20,540 1.76 0.0271
2013-08-01 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 462,000 462,000 20,185 0.0279
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.