Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership51,795 shares
Latest Disclosed Value $ 11,217,760
ProShare Advisors LLC reports 4.48% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 51,795 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $11,217,760 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 54,222 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -4.48% 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)
2026-04-24 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 51,795 -2,427 -4.48 11,218 -20.06 0.0166
2026-02-06 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 54,222 2,767 5.38 14,032 -11.95 0.0248
2025-11-06 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 51,455 -5,190 -9.16 15,938 -12.11 0.0334
2025-08-07 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 56,645 -2,942 -4.94 18,133 -11.85 0.0362
2025-05-08 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 59,587 6,128 11.46 20,572 35.57 0.0464
2025-02-14 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 53,459 11,347 26.94 15,174 28.06 0.0347
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 42,112 -2,269 -5.11 11,849 2.96 0.0290
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 44,381 2,386 5.68 11,508 9.60 0.0308
2024-05-08 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 41,995 -2,592 -5.81 10,500 4.73 0.0279
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 44,587 -2,877 -6.06 10,027 -7.32 0.0306
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 47,464 -835 -1.73 10,818 2.01 0.0337
2023-08-10 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 48,299 1,376 2.93 10,605 18.15 0.0308
2023-05-26 2023-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 46,923 5,503 13.29 8,977 14.94 0.0274
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 46,923 5,503 8,977 0.0285
2023-02-02 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 41,420 2,042 5.19 7,809 15.83 0.0274
2022-11-07 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 39,378 -3,863 -8.93 6,742 -4.38 0.0259
2022-08-01 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 43,241 -23,885 -35.58 7,051 -39.84 0.0234
2022-05-10 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 67,126 -640 -0.94 11,720 1.93 0.0252
2022-02-08 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 67,766 9,328 15.96 11,498 32.36 0.0226
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 58,438 1,994 3.53 8,687 9.86 0.0244
2021-08-13 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 56,444 4,612 8.90 7,907 22.27 0.0231
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 51,832 4,067 8.51 6,467 9.44 0.0203
2021-02-09 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 47,765 1,739 3.78 5,909 21.61 0.0220
2020-11-13 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 46,026 -263 -0.57 4,859 7.67 0.0225
2020-08-03 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 46,289 -1,361 -2.86 4,513 16.19 0.0241
2020-05-15 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 47,650 -30,132 -38.74 3,884 -47.56 0.0279
2020-02-12 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 77,782 4,342 5.91 7,407 12.60 0.0343
2019-11-12 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 73,440 -1,714 -2.28 6,578 -0.08 0.0368
2019-08-13 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 75,154 -4,903 -6.12 6,583 5.29 0.0394
2019-05-15 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 80,057 1 0.00 6,252 5.97 0.0374
2019-02-14 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 80,056 -3,918 -4.67 5,900 -5.62 0.0413
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 83,974 -7,001 -7.70 6,251 5.25 0.0424
2018-08-13 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 90,975 -875 -0.95 5,939 -5.92 0.0398
2018-05-14 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 91,850 4,487 5.14 6,313 14.20 0.0411
2018-02-14 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 87,363 10,031 12.97 5,528 16.13 0.0383
2017-11-13 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 77,332 126 0.16 4,760 7.69 0.0437
2017-08-11 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 77,206 1,328 1.75 4,420 3.03 0.0440
2017-05-12 2017-03-31 13F/A-2 GALLAGHER ARTHUR J COM 363576109 75,878 1,476 1.98 4,290 10.97 0.0449
2017-05-08 2017-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 75,878 0 4,290 0.0449
2017-04-25 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 75,878 4,290
2017-02-13 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 74,402 39,049 110.45 3,866 115.02 0.0428
2016-11-10 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 35,353 -5,289 -13.01 1,798 -7.08 0.0251
2016-08-12 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 40,642 -1,570 -3.72 1,935 3.04 0.0249
2016-05-06 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 42,212 -3,129 -6.90 1,878 1.19 0.0259
2016-02-05 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 45,341 3,891 9.39 1,856 8.47 0.0225
2015-11-06 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 41,450 -6,868 -14.21 1,711 -25.12 0.0240
2015-08-11 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 48,318 -1,840 -3.67 2,285 -2.56 0.0316
2015-05-08 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 50,158 50,158 0.00 2,345 0.0276
2015-01-30 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -109,091 -100.00 0 -100.00
2014-11-06 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 109,091 8,343 8.28 4,948 5.39 0.0656
2014-08-08 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 100,748 61,958 159.73 4,695 154.33 0.0608
2014-05-07 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 38,790 -79,303 -67.15 1,846 -66.69 0.0231
2014-02-04 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 118,093 83,360 240.00 5,542 265.57 0.0826
2013-11-07 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 34,733 5,009 16.85 1,516 16.71 0.0360
2013-07-25 2013-06-30 13F GALLAGHER ARTHUR J & COM 363576109 29,724 29,724 1,299 0.0255
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.