Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionPanagora Asset Management Inc
Latest Disclosed Ownership9,236 shares
Latest Disclosed Value $ 2,000,333
Panagora Asset Management Inc reports 7.97% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - Panagora Asset Management Inc filed a 13F-HR form disclosing ownership of 9,236 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $2,000,333 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,036 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -7.97% 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)
2026-05-14 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,236 -800 -7.97 2,000 -22.99 0.0075
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 10,036 -1,781 -15.07 2,597 -29.04 0.0092
2025-11-13 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,817 7,546 176.68 3,660 167.74 0.0147
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,271 -2,299 -34.99 1,367 -39.73 0.0062
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 6,570 0 0.00 2,268 21.67 0.0113
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,570 -1,144 -14.83 1,865 -14.10 0.0086
2024-11-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,714 -54 -0.70 2,170 7.75 0.0104
2024-07-29 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 7,768 -2,814 -26.59 2,014 -23.86 0.0101
2024-05-07 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 10,582 -238 -2.20 2,646 8.71 0.0138
2024-02-08 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 10,820 -272 -2.45 2,433 -3.76 0.0136
2023-10-31 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,092 233 2.15 2,528 6.04 0.0157
2023-08-11 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,859 66 0.61 2,384 15.50 0.0140
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 10,793 -3,229 -23.03 2,065 -21.91 0.0131
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 14,022 -2,262 -13.89 2,644 -5.20 0.0173
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 16,284 -76 -0.46 2,788 4.54 0.0193
2022-08-15 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 16,360 -68 -0.41 2,667 -7.01 0.0175
2022-05-12 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 16,428 2,890 21.35 2,868 24.86 0.0156
2022-02-10 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 13,538 -2,127 -13.58 2,297 -1.37 0.0122
2021-11-10 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 15,665 -215,452 -93.22 2,329 -92.81 0.0124
2021-08-11 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 231,117 -42,720 -15.60 32,375 -5.24 0.1735
2021-05-12 2021-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 273,837 4,891 1.82 34,167 2.69 0.1918
2021-02-10 2020-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 268,946 4,662 1.76 33,271 19.24 0.1969
2020-11-13 2020-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 264,284 135,168 104.69 27,903 121.66 0.1748
2020-08-12 2020-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 129,116 13,561 11.74 12,588 33.64 0.0802
2020-05-14 2020-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 115,555 103,004 820.68 9,419 688.20 0.0666
2020-02-12 2019-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 12,551 418 3.45 1,195 9.94 0.0054
2019-11-12 2019-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 12,133 -319 -2.56 1,087 -0.37 0.0050
2019-08-09 2019-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 12,452 -38,114 -75.37 1,091 -72.37 0.0049
2019-05-15 2019-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 50,566 -418,380 -89.22 3,949 -88.57 0.0176
2019-02-14 2018-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 468,946 88,123 23.14 34,561 21.92 0.1609
2018-11-13 2018-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 380,823 39,810 11.67 28,348 27.34 0.1067
2018-08-14 2018-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 341,013 271,327 389.36 22,261 364.74 0.0883
2018-05-15 2018-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 69,686 48,186 224.12 4,790 251.95 0.0189
2018-02-14 2017-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 21,500 -1,594 -6.90 1,361 -4.22 0.0051
2017-11-14 2017-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 23,094 7,748 50.49 1,421 61.66 0.0056
2017-08-14 2017-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 15,346 -3,269 -17.56 879 -16.44 0.0035
2017-05-15 2017-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 18,615 1,148 6.57 1,052 15.86 0.0044
2017-02-14 2016-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 17,467 -429 -2.40 908 -0.22 0.0042
2016-11-14 2016-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 17,896 -447 -2.44 910 4.24 0.0043
2016-08-15 2016-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 18,343 12,023 190.24 873 210.68 0.0043
2016-05-16 2016-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 281 8.49 0.0014
2016-02-12 2015-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 259 -0.77 0.0013
2015-11-13 2015-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 261 -12.71 0.0014
2015-08-14 2015-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 299 1.36 0.0015
2015-05-15 2015-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 295 -1.01 0.0015
2015-02-13 2014-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 298 3.83 0.0015
2014-11-12 2014-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 287 -2.71 0.0014
2014-08-14 2014-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 295 -1.99 0.0014
2014-05-15 2014-03-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 0 0.00 301 1.35 0.0014
2014-02-21 2013-12-31 13F ARTHUR J GALLAGHER COMMON 363576109 6,320 -1,700 -21.20 297 -15.14 0.0014
2013-11-14 2013-09-30 13F ARTHUR J GALLAGHER COMMON 363576109 8,020 0 0.00 350 0.00 0.0017
2013-08-14 2013-06-30 13F ARTHUR J GALLAGHER COMMON 363576109 8,020 8,020 350 0.0018
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.