Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionComerica Bank
Latest Disclosed Ownership198,341 shares
Latest Disclosed Value $ 51,328,587
Comerica Bank reports 10.75% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 198,341 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $51,328,587 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 222,225 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -10.75% 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)
2026-01-29 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 198,341 -23,884 -10.75 51,329 -25.43 0.2048
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 222,225 -35,472 -13.77 68,832 -16.56 0.2589
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 257,697 67 0.03 82,494 -7.25 0.3202
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 257,630 4,323 1.71 88,944 23.70 0.3735
2025-02-14 2024-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 253,307 11,039 4.56 71,901 5.48 0.2900
2025-02-14 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 253,307 11,039 71,901 0.2408
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 242,268 -4,217 -1.71 68,167 6.65 0.2696
2024-08-15 2024-06-30 13F GALLAGHER ARTHUR J COMMON 363576109 246,485 -2,143 -0.86 63,916 2.82 0.2660
2024-05-16 2024-03-31 13F GALLAGHER ARTHUR J COMMON 363576109 248,628 -2,941 -1.17 62,167 9.89 0.2679
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COMMON 363576109 251,569 82 0.03 56,573 -1.31 0.2606
2023-11-21 2023-09-30 13F GALLAGHER ARTHUR J COMMON 363576109 251,487 18,343 7.87 57,321 0.2985
2023-08-22 2023-06-30 13F GALLAGHER ARTHUR J EQU 363576109 233,144 39,823 20.60 0 -100.00 0.0006
2023-01-26 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 193,321 12,015 6.63 38 -99.89 0.2941
2022-10-28 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 181,306 -3,791 -2.05 32,481 5.38 0.2738
2022-08-02 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 185,097 1,215 0.66 30,822 -8.85 0.2531
2022-04-27 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 183,882 -3,654 -1.95 33,816 17.70 0.2454
2022-02-18 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 187,536 -1,830 -0.97 28,730 -8.14 0.2114
2021-11-22 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 189,366 -6,863 -3.50 31,277 12.25 0.1884
2021-08-26 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 196,229 -9,634 -4.68 27,864 -1.88 0.1664
2021-04-28 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 205,863 -23,152 -10.11 28,397 5.22 0.1693
2021-01-28 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 229,015 19,876 9.50 26,987 19.56 0.1712
2020-10-30 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 209,139 1,470 0.71 22,571 4.06 0.1638
2020-07-31 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 207,669 -18,148 -8.04 21,690 27.59 0.1671
2020-05-01 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 225,817 -3,636 -1.58 17,000 -26.06 0.1559
2020-02-07 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 229,453 -2,049 -0.89 22,991 8.88 0.1742
2019-10-31 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 231,502 -8,123 -3.39 21,116 -4.16 0.1669
2019-08-02 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 239,625 -7,533 -3.05 22,033 13.42 0.1764
2019-05-02 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 247,158 -16,758 -6.35 19,426 2.34 0.1575
2019-02-06 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 263,916 -208,279 -44.11 18,981 -44.44 0.1612
2018-11-01 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 472,195 -831 -0.18 34,163 3.64 0.2756
2018-08-01 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 473,026 -23,147 -4.67 32,964 -5.22 0.2305
2018-05-01 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 496,173 -23,282 -4.48 34,781 2.82 0.2485
2018-02-02 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 519,455 -47,692 -8.41 33,827 -4.93 0.2254
2017-11-06 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 567,147 -49,162 -7.98 35,582 -1.86 0.2575
2017-08-03 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 616,309 -12,730 -2.02 36,258 1.61 0.2714
2017-05-03 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 629,039 -6,374 -1.00 35,685 6.34 0.2708
2017-02-08 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 635,413 37,577 6.29 33,556 13.21 0.2655
2016-08-11 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 597,836 -100,149 -14.35 29,641 -5.50 0.2560
2016-05-11 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 697,985 -4,416 -0.63 31,367 16.60 0.2801
2016-02-05 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 702,401 -29,531 -4.03 26,901 -10.97 0.2640
2015-11-12 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 731,932 -778,788 -51.55 30,214 -57.72 0.2861
2015-08-13 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,510,720 750,576 98.74 71,456 101.08 0.3068
2015-05-15 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 760,144 -702,656 -48.04 35,536 -48.40 0.3009
2015-02-13 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,462,800 1,327,426 980.56 68,866 1,021.60 0.2978
2014-10-21 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 135,374 -2,139 -1.56 6,140 -4.18 0.0542
2014-08-12 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 137,513 20,511 17.53 6,408 15.11 0.0545
2014-05-15 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 117,002 3,375 2.97 5,567 4.41 0.0426
2014-02-11 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 113,627 -21,711 -16.04 5,332 -9.73 0.0413
2013-11-12 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 135,338 3,851 2.93 5,907 2.82 0.0411
2013-08-13 2013-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 131,487 131,487 5,745 0.0468
2013-08-08 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 720,036 31,461
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.