Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership170,126 shares
Latest Disclosed Value $ 36,845,965
First Trust Advisors Lp reports 904.35% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 170,126 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $36,845,965 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 16,939 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 904.35% 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 GALLAGHER ARTHUR J COM 363576109 170,126 153,187 904.35 36,846 740.63 0.0263
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 16,939 -27,523 -61.90 4,384 -68.17 0.0032
2025-11-12 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 44,462 -116,225 -72.33 13,772 -73.23 0.0102
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 160,687 59,689 59.10 51,439 47.52 0.0414
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 100,998 36,003 55.39 34,869 89.01 0.0309
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 64,995 -18,370 -22.04 18,449 -21.35 0.0163
2024-11-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 83,365 40,233 93.28 23,456 109.73 0.0223
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 43,132 28,500 194.78 11,185 205.74 0.0114
2024-05-13 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 14,632 -52,629 -78.25 3,659 -75.81 0.0037
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 67,261 6,530 10.75 15,126 9.27 0.0165
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 60,731 21,056 53.07 13,842 58.90 0.0164
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 39,675 -23,396 -37.09 8,711 -27.81 0.0099
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 63,071 -95,380 -60.20 12,066 -59.61 0.0139
2023-02-09 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 158,451 16,915 11.95 29,877 23.29 0.0355
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 141,536 56,557 66.55 24,234 74.91 0.0314
2022-08-12 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 84,979 48,426 132.48 13,855 117.09 0.0171
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 36,553 -15,627 -29.95 6,382 -27.92 0.0065
2022-02-08 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 52,180 -428,277 -89.14 8,854 -87.60 0.0086
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 480,457 -71,268 -12.92 71,420 -7.59 0.0768
2021-10-12 2021-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 551,725 -1,582 -0.29 77,286 11.91 0.0837
2021-08-16 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 586,725 33,418 82,189 0.0848
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 553,307 508,683 1,139.93 69,059 1,151.07 0.0836
2021-02-02 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 44,624 16,306 57.58 5,520 84.62 0.0073
2020-11-05 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 28,318 -528,379 -94.91 2,990 -94.49 0.0048
2020-07-22 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 556,697 -54,149 -8.86 54,272 9.00 0.0941
2020-05-06 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 610,846 -195,547 -24.25 49,790 -35.16 0.1128
2020-02-03 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 806,393 -636,740 -44.12 76,793 -40.59 0.1311
2019-11-04 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,443,133 955,840 196.15 129,261 202.85 0.2434
2019-07-30 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 487,293 18,481 3.94 42,682 16.57 0.0805
2019-06-19 2019-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 468,812 -38,423 -7.57 36,614 -2.06 0.0728
2019-05-09 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 468,812 -38,423 36,614
2019-02-07 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 507,235 -376,101 -42.58 37,383 -43.15 0.0886
2018-10-25 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 883,336 356,273 67.60 65,756 91.11 0.1224
2018-08-02 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 527,063 1,683 0.32 34,407 -4.71 0.0713
2018-04-23 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 525,380 -55,492 -9.55 36,109 -1.77 0.0829
2018-02-08 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 580,872 53,180 10.08 36,758 13.17 0.0875
2017-10-24 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 527,692 -69,877 -11.69 32,479 -5.06 0.0835
2017-08-02 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 597,569 -54,526 -8.36 34,211 -7.21 0.0913
2017-05-02 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 652,095 61,576 10.43 36,869 20.16 0.1022
2017-02-06 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 590,519 23,290 4.11 30,683 6.34 0.0913
2016-11-01 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 567,229 32,974 6.17 28,855 13.46 0.0861
2016-08-04 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 534,255 137,462 34.64 25,431 44.09 0.0801
2016-05-10 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 396,793 21,393 5.70 17,649 14.84 0.0567
2016-05-04 2015-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 375,400 14,244 3.94 15,369 3.09 0.0399
2016-02-03 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 375,400 15,369
2015-11-05 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 361,156 114,498 46.42 14,909 27.79 0.0432
2015-08-04 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 246,658 24,869 11.21 11,667 12.52 0.0303
2015-05-04 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 221,789 -72,189 -24.56 10,369 -25.08 0.0305
2015-02-13 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 293,978 74,635 34.03 13,840 39.11 0.0467
2014-11-12 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 219,343 -46,339 -17.44 9,949 -19.64 0.0391
2014-08-11 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 265,682 43,658 19.66 12,381 17.20 0.0514
2014-05-12 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 222,024 50,560 29.49 10,564 31.28 0.0464
2014-08-08 2013-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 171,464 -66,669 -28.00 8,047 -22.59 0.0390
2014-02-13 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 171,464 8,047
2013-11-12 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 238,133 35,987 17.80 10,395 17.70 0.0563
2013-08-12 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 202,146 202,146 8,832 0.0575
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.