Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership346,680 shares
Latest Disclosed Value $ 75,083,954
Bnp Paribas Arbitrage, Sa reports 27.34% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 346,680 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $75,083,954 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 477,105 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -27.34% 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)
2026-05-12 2026-03-31 13F Arthur J Gallagher Equity 363576109 346,680 -130,425 -27.34 75,084 -39.19 0.0037
2026-02-10 2025-12-31 13F Arthur J Gallagher Equity 363576109 477,105 128,675 36.93 123,470 14.41 0.0559
2025-11-13 2025-09-30 13F Arthur J Gallagher Equity 363576109 348,430 -13,903 -3.84 107,923 -6.96 0.0576
2025-08-14 2025-06-30 13F Arthur J Gallagher Equity 363576109 362,333 10,797 3.07 115,990 -4.43 0.0665
2025-05-14 2025-03-31 13F Arthur J Gallagher Equity 363576109 351,536 -170,078 -32.61 121,364 -18.03 0.0714
2025-02-14 2024-12-31 13F Arthur J Gallagher Equity 363576109 521,614 290,969 126.15 148,060 128.15 0.0830
2024-11-13 2024-09-30 13F Arthur J Gallagher Equity 363576109 230,645 5,707 2.54 64,897 11.26 0.0436
2024-08-13 2024-06-30 13F Arthur J Gallagher Equity 363576109 224,938 -102,386 -31.28 58,329 -28.73 0.0475
2024-05-01 2024-03-31 13F Arthur J Gallagher Equity 363576109 327,324 136,835 71.83 81,844 91.04 0.0719
2024-02-14 2023-12-31 13F/A-2 Arthur J Gallagher Equity 363576109 190,489 94,319 98.08 42,843 95.45 0.0486
2024-02-07 2023-12-31 13F/A-1 Arthur J Gallagher Equity 363576109 116,893 20,723 26,287 0.0037
2024-02-07 2023-12-31 13F Arthur J Gallagher Equity 363576109 116,893 26,287
2023-11-14 2023-09-30 13F Arthur J Gallagher Equity 363576109 96,170 -32,060 -25.00 21,920 -22.15 0.0282
2023-08-09 2023-06-30 13F Arthur J Gallagher Equity 363576109 128,230 11,784 10.12 28,155 26.39 0.0352
2023-05-12 2023-03-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 116,446 -17,210 -12.88 22,277 -11.60 0.0312
2023-02-14 2022-12-31 13F Arthur J Gallagher Equity 363576109 133,656 26,028 24.18 25,200 36.74 0.0387
2022-11-16 2022-09-30 13F/A-1 Arthur J Gallagher Equity 363576109 107,628 -8,493 -7.31 18,428 -2.66 0.0295
2022-11-15 2022-09-30 13F Arthur J Gallagher Equity 363576109 107,628 -8,493 18,428 0.0044
2022-08-12 2022-06-30 13F Arthur J Gallagher Equity 363576109 116,121 -38,537 -24.92 18,932 -29.89 0.0295
2022-05-18 2022-03-31 13F/A-1 Arthur J Gallagher Equity 363576109 154,658 -23,806 -13.34 27,003 -10.82 0.0363
2022-02-09 2021-12-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 178,464 9,113 5.38 30,280 20.28 0.0431
2021-11-16 2021-09-30 13F/A-1 ARTHUR J GALLAGHER AND EQUITY 363576109 169,351 -86,918 -33.92 25,174 -29.87 0.0357
2021-11-12 2021-09-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 400,835 144,566 42,320 0.0000
2021-08-10 2021-06-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 256,269 62,903 32.53 35,898 48.79 0.0475
2021-05-07 2021-03-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 193,366 72,735 60.30 24,126 61.67 0.0353
2021-02-10 2020-12-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 120,631 -280,204 -69.91 14,923 -64.74 0.0278
2020-10-30 2020-09-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 400,835 333,405 494.45 42,320 543.85 0.0605
2020-08-06 2020-06-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 67,430 -22,789 -25.26 6,574 -10.61 0.0116
2020-05-13 2020-03-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 90,219 -74,918 -45.37 7,354 -53.24 0.0151
2020-02-12 2019-12-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 165,137 56,688 52.27 15,726 61.90 0.0286
2019-11-07 2019-09-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 108,449 26,471 32.29 9,714 35.28 0.0172
2019-07-30 2019-06-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 81,978 -256,688 -75.79 7,180 -72.85 0.0143
2019-04-25 2019-03-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 338,666 282,648 504.57 26,450 540.72 0.0572
2019-02-12 2018-12-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 56,018 -132,509 -70.29 4,129 -70.58 0.0098
2018-11-07 2018-09-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 188,527 -17,073 -8.30 14,034 4.56 0.0207
2018-07-25 2018-06-30 13F ARTHUR J GALLAGHER AND EQUITY 363576109 205,600 10,905 5.60 13,422 0.30 0.0223
2018-05-11 2018-03-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 194,695 25,448 15.04 13,381 24.95 0.0251
2018-03-05 2017-12-31 13F/A-1 ARTHUR J GALLAGHER AND EQUITY 363576109 169,247 -111,577 -39.73 10,710 -38.04 0.0190
2018-02-01 2017-12-31 13F ARTHUR J GALLAGHER AND EQUITY 363576109 169,247 -111,577 10,710
2017-11-03 2017-09-30 13F GALLAGHER ARTHUR J AND STOCK 363576109 280,824 -9,818 -3.38 17,285 3.88 0.0422
2017-08-03 2017-06-30 13F GALLAGHER ARTHUR J AND STOCK 363576109 290,642 7,054 2.49 16,639 3.77 0.0502
2017-05-03 2017-03-31 13F GALLAGHER ARTHUR J AND STOCK 363576109 283,588 165,078 139.29 16,034 160.42 0.0423
2017-02-14 2016-12-31 13F GALLAGHER ARTHUR J AND STOCK 363576109 118,510 44,451 60.02 6,158 63.45 0.0288
2016-10-05 2016-09-30 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 74,059 18,455 33.19 3,767 42.37 0.0155
2016-07-06 2016-06-30 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 55,604 -29,688 -34.81 2,647 -30.24 0.0119
2016-04-22 2016-03-31 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 85,292 64,143 303.29 3,794 338.50 0.0160
2016-04-19 2015-12-31 13F/A-1 * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 21,149 -4,477 -17.47 866 -18.16 0.0042
2016-02-10 2015-12-31 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 21,149 866
2015-11-13 2015-09-30 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 25,626 11,797 85.31 1,058 61.62 0.0027
2015-08-14 2015-06-30 13F GALLAGHER ARTHUR J AND CO COM STOCK 363576109 13,829 1,926 16.18 654 17.63 0.0018
2015-05-15 2015-03-31 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 11,903 1,259 11.83 556 10.98 0.0015
2015-03-10 2014-12-31 13F/A-1 * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 10,644 -10,961 -50.73 501 -48.88 0.0018
2015-02-11 2014-12-31 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 10,644 501
2014-11-12 2014-09-30 13F * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 21,605 12,758 144.21 980 137.86 0.0009
2014-08-14 2014-06-30 13F/A-1 * GALLAGHER ARTHUR J AND CO COM STOCK 363576109 8,847 -26,654 -75.08 412 -74.22 0.0004
2014-08-14 2014-06-30 13F GALLAGHER ARTHUR J AND CO COM STOCK 363576109 8,847 412
2014-05-13 2014-03-31 13F GALLAGHER ARTHUR J AND STOCK 363576109 35,501 19,398 120.46 1,598 111.66 0.0012
2014-04-02 2013-12-31 13F/A-1 GALLAGHER ARTHUR J AND STOCK 363576109 16,103 10,737 200.09 756 222.65 0.0006
2014-02-12 2013-12-31 13F GALLAGHER ARTHUR J AND STOCK 363576109 16,103 756
2013-11-13 2013-09-30 13F GALLAGHER ARTHUR J AND STOCK 363576109 5,366 -12,803 -70.47 234 -70.49 0.0002
2013-08-13 2013-06-30 13F GALLAGHER ARTHUR J AND STOCK 363576109 18,169 18,169 794 0.0006
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.