Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionSomerset Trust Co
Latest Disclosed Ownership1,062 shares
Latest Disclosed Value $ 230,008
Somerset Trust Co reports 47.58% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On April 2, 2026 - Somerset Trust Co filed a 13F-HR form disclosing ownership of 1,062 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $230,008 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 2,026 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -47.58% 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)
2026-04-02 2026-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 1,062 -964 -47.58 230 -56.11 0.0705
2026-01-09 2025-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,026 0 0.00 524 -16.43 0.1604
2025-10-14 2025-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,026 0 0.00 628 -3.24 0.1937
2025-07-07 2025-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,026 -15 -0.73 649 -7.95 0.2114
2025-04-08 2025-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,041 -49 -2.34 705 18.72 0.2509
2025-01-15 2024-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,090 -34 -1.60 593 -0.67 0.2233
2024-10-08 2024-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,124 -35 -1.62 598 6.80 0.2236
2024-07-09 2024-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,159 0 0.00 560 3.71 0.2296
2024-04-05 2024-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,159 0 0.00 540 11.13 0.2202
2024-01-08 2023-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,159 -636 -22.75 486 -23.86 0.2128
2023-10-17 2023-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,795 -5 -0.18 637 3.75 0.2905
2023-07-07 2023-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,800 -41 -1.44 615 13.08 0.2645
2023-04-05 2023-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,841 -82 -2.81 544 -1.45 0.2356
2023-01-03 2022-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 0 0.00 1 -100.00 0.2311
2022-10-03 2022-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 0 0.00 500 4.82 0.2328
2022-07-06 2022-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 0 0.00 477 -6.47 0.2090
2022-04-05 2022-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 0 0.00 510 2.82 0.1973
2022-01-07 2021-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 0 0.00 496 14.02 0.1808
2021-10-07 2021-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,923 -52 -1.75 435 4.32 0.1777
2021-07-06 2021-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,975 0 0.00 417 12.40 0.1702
2021-04-07 2021-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,975 48 1.64 371 2.49 0.1599
2021-01-25 2020-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,927 -88 -2.92 362 13.84 0.1647
2020-10-15 2020-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 3,015 167 5.86 318 14.39 0.1601
2020-07-17 2020-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 2,848 -2,979 -51.12 278 -41.47 0.1482
2020-04-20 2020-03-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 5,827 -913 -13.55 475 -26.01 0.3116
2020-01-17 2019-12-31 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 6,740 -213 -3.06 642 3.05 0.3173
2019-10-25 2019-09-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 6,953 -1,378 -16.54 623 -14.66 0.3290
2019-07-31 2019-06-30 13F GALLAGHER ARTHUR J & CO COM Common Stock 363576109 8,331 -170 -2.00 730 9.94 0.3764
2019-04-09 2019-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,501 -24 -0.28 664 5.73 0.3493
2019-01-22 2018-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,525 -4 -0.05 628 -1.10 0.3650
2018-10-15 2018-09-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,529 -6 -0.07 635 14.00 0.3138
2018-07-19 2018-06-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,535 -135 -1.56 557 -6.54 0.2991
2018-04-13 2018-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,670 7 0.08 596 8.76 0.3079
2018-01-17 2017-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,663 -116 -1.32 548 1.48 0.2738
2017-10-13 2017-09-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,779 81 0.93 540 8.43 0.2863
2017-07-13 2017-06-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,698 22 0.25 498 1.43 0.2714
2017-04-18 2017-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,676 -5 -0.06 491 8.87 0.2755
2017-02-01 2016-12-31 13F/A-1 GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,681 -307 -3.42 451 -1.31 0.2674
2017-01-25 2016-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,681 451
2016-10-18 2016-09-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,988 7 0.08 457 7.03 0.2721
2016-07-13 2016-06-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,981 0 0.00 427 7.02 0.2637
2016-04-13 2016-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 8,981 -90 -0.99 399 7.55 0.2647
2016-01-25 2015-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 9,071 3,662 67.70 371 66.37 0.2439
2015-10-20 2015-09-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,409 -308 -5.39 223 -17.41 0.1567
2015-07-14 2015-06-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,717 81 1.44 270 2.66 0.1771
2015-04-16 2015-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,636 70 1.26 263 0.38 0.1736
2015-01-09 2014-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,566 -43 -0.77 262 3.15 0.1744
2014-10-07 2014-09-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,609 0 0.00 254 -2.68 0.1774
2014-07-09 2014-06-30 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,609 -37 -0.66 261 -2.97 0.1849
2014-04-09 2014-03-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,646 -12 -0.21 269 1.13 0.2049
2014-01-22 2013-12-31 13F GALLAGHER ARTHUR J & CO COM COMMON STOCK 363576109 5,658 5,658 266 0.2022
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.