Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership4,018 shares
Latest Disclosed Value $ 870,219
Quadrant Capital Group Llc reports 3.13% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 4,018 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $870,219 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,148 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -3.13% 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)
2026-05-13 2026-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 4,018 -130 -3.13 870 -18.92 0.0260
2026-05-11 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,018 -130 49 0.0369
2026-02-12 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,148 -2,396 -36.61 1,073 -47.04 0.0324
2025-11-13 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 6,544 468 7.70 2,027 4.16 0.0659
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 6,076 1,701 38.88 1,945 28.81 0.0700
2025-05-13 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,375 2,617 148.86 1,510 202.61 0.0561
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,758 9 0.51 499 1.42 0.0344
2024-11-12 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,749 -9 -0.51 492 8.13 0.0342
2024-08-12 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,758 24 1.38 456 5.08 0.0338
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,734 -69 -3.83 434 6.91 0.0342
2024-02-08 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,803 77 4.46 405 3.05 0.0348
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,726 223 14.84 393 19.09 0.0394
2023-08-10 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,503 3 0.20 330 15.38 0.0327
2023-05-11 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,500 -30 -1.96 287 -0.69 0.0299
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,530 354 30.10 288 43.28 0.0327
2022-11-10 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,176 -33 -2.73 201 2.03 0.0266
2022-08-09 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,209 237 24.38 197 15.88 0.0265
2022-05-06 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 972 111 12.89 170 16.44 0.0206
2022-02-01 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 861 52 6.43 146 21.67 0.0174
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 809 23 2.93 120 9.09 0.0167
2021-08-09 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 786 -25 -3.08 110 8.91 0.0160
2021-05-12 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 811 84 11.55 101 12.22 0.0164
2021-02-16 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 727 22 3.12 90 21.62 0.0167
2020-11-13 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 705 -252 -26.33 74 -20.43 0.0161
2020-08-13 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 957 16 1.70 93 19.23 0.0206
2020-05-15 2020-03-31 13F Arthur J. Gallagher Com 363576109 941 350 59.22 78 50.00 0.0131
2020-03-19 2019-12-31 13F/A-1 Arthur J. Gallagher Com 363576109 591 85 16.80 52 20.93 0.0063
2020-02-03 2019-12-31 13F Arthur J. Gallagher Com 363576109 591 85 52 175.7148
2019-10-24 2019-09-30 13F Arthur J. Gallagher COM 363576109 506 0 0.00 43 2.38 0.0066
2019-07-24 2019-06-30 13F Arthur J. Gallagher COM 363576109 506 0 0.00 42 10.53 0.0066
2019-04-29 2019-03-31 13F Arthur J. Gallagher COM 363576109 506 309 156.85 38 216.67 0.0067
2019-01-17 2018-12-31 13F Arthur J. Gallagher COM 363576109 197 0 0.00 12 0.00 0.0032
2018-10-29 2018-09-30 13F Arthur J. Gallagher COM 363576109 197 0 0.00 12 9.09 0.0034
2018-08-08 2018-06-30 13F Arthur J. Gallagher COM 363576109 197 0 0.00 11 -8.33 0.0039
2018-05-10 2018-03-31 13F Arthur J. Gallagher COM 363576109 197 0 0.00 12 20.00 0.0044
2018-01-31 2017-12-31 13F Gallagher Arthur J COM 363576109 197 0 0.00 10 0.00 0.0040
2017-10-13 2017-09-30 13F Gallagher Arthur J COM 363576109 197 -2 -1.01 10 42.86 0.0041
2017-08-14 2017-06-30 13F Gallagher Arthur J COM 363576109 199 0 0.00 7 -22.22 0.0031
2017-04-10 2017-03-31 13F Gallagher Arthur J COM 363576109 199 93 87.74 9 125.00 0.0040
2017-01-11 2016-12-31 13F Gallagher Arthur J COM 363576109 106 0 0.00 4 0.00 0.0020
2016-10-25 2016-09-30 13F Gallagher Arthur J COM 363576109 106 0 0.00 4 0.00 0.0026
2016-07-28 2016-06-30 13F Gallagher Arthur J COM 363576109 106 44 70.97 4 100.00 0.0028
2016-04-27 2016-03-31 13F Gallagher Arthur J COM 363576109 62 -25 -28.74 2 -33.33 0.0013
2016-01-28 2015-12-31 13F Gallagher Arthur J COM 363576109 87 87 3 0.0021
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.