Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionFenimore Asset Management Inc
Latest Disclosed Ownership566,766 shares
Latest Disclosed Value $ 122,750,226
Fenimore Asset Management Inc reports 59.90% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Fenimore Asset Management Inc filed a 13F-HR form disclosing ownership of 566,766 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $122,750,226 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 354,440 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 59.90% 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)
2026-05-15 2026-03-31 13F Arthur J. Gallagher COM 363576109 566,766 212,326 59.90 122,750 33.82 2.7376
2026-02-02 2025-12-31 13F Arthur J. Gallagher COM 363576109 354,440 -861 -0.24 91,726 -16.65 1.9102
2025-10-20 2025-09-30 13F Arthur J. Gallagher COM 363576109 355,301 -1,041 -0.29 110,051 -3.53 2.2063
2025-07-22 2025-06-30 13F Arthur J. Gallagher COM 363576109 356,342 -10,562 -2.88 114,072 -9.95 2.2765
2025-04-14 2025-03-31 13F Arthur J. Gallagher COM 363576109 366,904 -37,098 -9.18 126,670 10.46 2.6827
2025-01-21 2024-12-31 13F Arthur J. Gallagher COM 363576109 404,002 -3,306 -0.81 114,676 0.06 2.4093
2024-11-14 2024-09-30 13F Arthur J. Gallagher COM 363576109 407,308 -4,500 -1.09 114,604 7.32 2.3086
2024-08-14 2024-06-30 13F Arthur J. Gallagher COM 363576109 411,808 -5,488 -1.32 106,786 2.34 2.3390
2024-04-30 2024-03-31 13F Arthur J. Gallagher COM 363576109 417,296 -7,534 -1.77 104,341 9.22 2.2037
2024-01-23 2023-12-31 13F Arthur J. Gallagher COM 363576109 424,830 -9,906 -2.28 95,536 -3.59 2.2179
2023-10-19 2023-09-30 13F Arthur J. Gallagher COM 363576109 434,736 -5,719 -1.30 99,089 2.46 2.5737
2023-07-25 2023-06-30 13F Arthur J. Gallagher COM 363576109 440,455 -19,980 -4.34 96,711 9.79 2.4128
2023-04-20 2023-03-31 13F Arthur J. Gallagher COM 363576109 460,435 -16,438 -3.45 88,086 98,871.91 2.2987
2023-01-17 2022-12-31 13F Arthur J. Gallagher COM 363576109 476,873 -18,076 -3.65 90 -99.89 2.4172
2022-10-25 2022-09-30 13F Arthur J. Gallagher COM 363576109 494,949 -30,950 -5.89 84,745 -1.16 2.4356
2022-07-26 2022-06-30 13F Arthur J. Gallagher COM 363576109 525,899 -13,309 -2.47 85,743 -8.93 2.4203
2022-04-12 2022-03-31 13F Arthur J. Gallagher COM 363576109 539,208 -11,994 -2.18 94,146 0.67 2.3025
2022-01-13 2021-12-31 13F Arthur J. Gallagher COM 363576109 551,202 -15,445 -2.73 93,522 11.03 2.0772
2021-10-26 2021-09-30 13F Arthur J. Gallagher COM 363576109 566,647 -2,099 -0.37 84,232 5.73 2.0702
2021-07-15 2021-06-30 13F Arthur J. Gallagher COM 363576109 568,746 -29,826 -4.98 79,670 6.68 1.9298
2021-04-16 2021-03-31 13F Arthur J. Gallagher COM 363576109 598,572 -6,943 -1.15 74,684 -0.30 1.9280
2021-01-28 2020-12-31 13F Arthur J. Gallagher COM 363576109 605,515 -13,080 -2.11 74,908 14.69 2.1035
2020-10-13 2020-09-30 13F Arthur J. Gallagher COM 363576109 618,595 -9,320 -1.48 65,311 6.69 2.1092
2020-07-28 2020-06-30 13F Arthur J. Gallagher COM 363576109 627,915 2,130 0.34 61,215 20.01 2.1489
2020-04-24 2020-03-31 13F Arthur J. Gallagher COM 363576109 625,785 3,350 0.54 51,008 -13.95 2.0568
2020-01-16 2019-12-31 13F Arthur J. Gallagher COM 363576109 622,435 27,945 4.70 59,274 11.32 1.8074
2019-10-22 2019-09-30 13F Arthur J. Gallagher COM 363576109 594,490 9,646 1.65 53,248 3.95 1.7558
2019-07-16 2019-06-30 13F Arthur J. Gallagher COM 363576109 584,844 24,845 4.44 51,226 17.13 1.7023
2019-04-11 2019-03-31 13F Arthur J. Gallagher COM 363576109 559,999 2,279 0.41 43,736 6.40 1.5892
2019-01-11 2018-12-31 13F Arthur J. Gallagher COM 363576109 557,720 2,991 0.54 41,104 -0.46 1.6637
2018-10-18 2018-09-30 13F Arthur J. Gallagher COM 363576109 554,729 -535 -0.10 41,294 13.92 1.4503
2018-07-11 2018-06-30 13F Arthur J. Gallagher COM 363576109 555,264 6,655 1.21 36,248 -3.87 1.3683
2018-04-10 2018-03-31 13F Arthur J. Gallagher COM 363576109 548,609 -12,588 -2.24 37,706 6.18 1.4554
2018-02-06 2017-12-31 13F Arthur J. Gallagher COM 363576109 561,197 -330 -0.06 35,513 2.75 1.3478
2017-10-17 2017-09-30 13F Arthur J. Gallagher COM 363576109 561,527 380 0.07 34,562 7.58 1.3884
2017-07-13 2017-06-30 13F Arthur J. Gallagher COM 363576109 561,147 11,275 2.05 32,126 3.33 1.3298
2017-04-11 2017-03-31 13F Arthur J. Gallagher COM 363576109 549,872 0 0.00 31,090 8.82 1.3315
2017-01-12 2016-12-31 13F Arthur J. Gallagher COM 363576109 549,872 11,175 2.07 28,571 4.26 1.2802
2016-10-12 2016-09-30 13F Arthur J. Gallagher COM 363576109 538,697 3,925 0.73 27,404 7.66 1.3145
2016-07-13 2016-06-30 13F Arthur J. Gallagher COM 363576109 534,772 200,310 59.89 25,455 71.10 1.2577
2016-04-08 2016-03-31 13F Arthur J. Gallagher COM 363576109 334,462 1,050 0.31 14,877 8.99 0.7526
2016-01-11 2015-12-31 13F Arthur J. Gallagher COM 363576109 333,412 7,525 2.31 13,650 1.46 0.7143
2015-10-16 2015-09-30 13F Arthur J. Gallagher COM 363576109 325,887 12,037 3.84 13,453 -9.38 0.7221
2015-07-20 2015-06-30 13F Arthur J. Gallagher COM 363576109 313,850 10,760 3.55 14,845 4.77 0.7647
2015-04-08 2015-03-31 13F Arthur J Gallagher COM 363576109 303,090 3,800 1.27 14,169 0.55 0.7293
2015-01-14 2014-12-31 13F Arthur J Gallagher COM 363576109 299,290 -400 -0.13 14,091 3.66 0.7156
2014-10-09 2014-09-30 13F Arthur J Gallagher COM 363576109 299,690 500 0.17 13,594 -2.50 0.7538
2014-07-14 2014-06-30 13F Arthur J Gallagher COM 363576109 299,190 960 0.32 13,942 -1.75 0.7550
2014-04-04 2014-03-31 13F Arthur J Gallagher COM 363576109 298,230 125 0.04 14,190 1.43 0.7847
2014-01-16 2013-12-31 13F Arthur J Gallagher COM 363576109 298,105 175 0.06 13,990 7.57 0.7923
2013-10-10 2013-09-30 13F Arthur J Gallagher COM 363576109 297,930 -1,125 -0.38 13,005 -0.47 0.7868
2013-07-16 2013-06-30 13F Arthur J Gallagher COM 363576109 299,055 299,055 13,066 0.8484
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.