Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionArlington Partners LLC
Latest Disclosed Ownership1,124 shares
Latest Disclosed Value $ 243,436
Arlington Partners LLC ownership in AJG / Arthur J. Gallagher & Co.

On April 9, 2026 - Arlington Partners LLC filed a 13F-HR form disclosing ownership of 1,124 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $243,436 USD as of March 31, 2026. The entity filed a previous 13F-HR on April 16, 2024 disclosing 0 shares of Arthur J. Gallagher & Co..

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)
2026-04-09 2026-03-31 13F Arthur J Gallagher COM 363576109 1,124 1,124 243 0.4859
2024-04-16 2024-03-31 13F Arthur J Gallagher COM 363576109 0 -1,800 -100.00 0 -100.00
2024-01-24 2023-12-31 13F Arthur J Gallagher COM 363576109 1,800 -5 -0.28 405 -1.70 0.1164
2023-10-24 2023-09-30 13F Arthur J Gallagher COM 363576109 1,805 -284 -13.60 411 -10.26 0.1689
2023-07-26 2023-06-30 13F Arthur J Gallagher COM 363576109 2,089 0 0.00 459 14.79 0.0708
2023-04-26 2023-03-31 13F Arthur J Gallagher COM 363576109 2,089 5 0.24 400 1.79 0.0569
2023-01-24 2022-12-31 13F/A-1 Arthur J Gallagher COM 363576109 2,084 0 0.00 393 9.80 0.0623
2023-01-19 2022-12-31 13F Arthur J Gallagher COM 363576109 2,084 0 0 0.0623
2022-10-28 2022-09-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 357 5.00 0.1431
2022-07-25 2022-06-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 340 -6.59 0.1128
2022-04-14 2022-03-31 13F Arthur J Gallagher COM 363576109 2,084 -16 -0.76 364 2.25 0.1030
2022-01-18 2021-12-31 13F Arthur J Gallagher COM 363576109 2,100 16 0.77 356 14.84 0.0956
2021-10-15 2021-09-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 310 6.16 0.0892
2021-07-07 2021-06-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 292 12.31 0.1014
2021-04-19 2021-03-31 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 260 0.78 0.0952
2021-01-13 2020-12-31 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 258 17.27 0.1188
2020-10-15 2020-09-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 220 8.37 0.1206
2020-07-13 2020-06-30 13F Arthur J Gallagher COM 363576109 2,084 0 0.00 203 19.41 0.1140
2020-04-13 2020-03-31 13F Arthur J Gallagher COM 363576109 2,084 1,500 256.85 170 203.57 0.0885
2020-01-16 2019-12-31 13F Arthur J Gallagher COM 363576109 584 300 105.63 56 124.00 0.0344
2019-10-18 2019-09-30 13F Arthur J Gallagher COM 363576109 284 0 0.00 25 0.00 0.0159
2019-07-10 2019-06-30 13F Arthur J Gallagher COM 363576109 284 0 0.00 25 13.64 0.0112
2019-04-05 2019-03-31 13F Arthur J Gallagher COM 363576109 284 -59 -17.20 22 -12.00 0.0157
2019-01-10 2018-12-31 13F Arthur J Gallagher COM 363576109 343 0 0.00 25 -3.85 0.0163
2018-10-23 2018-09-30 13F Arthur J Gallagher COM 363576109 343 0 0.00 26 18.18 0.0183
2018-07-11 2018-06-30 13F Arthur J Gallagher COM 363576109 343 0 0.00 22 -8.33 0.0208
2018-05-07 2018-03-31 13F Arthur J Gallagher COM 363576109 343 343 24 0.0226
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.