Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionCIBC Asset Management Inc
Latest Disclosed Ownership72,457 shares
Latest Disclosed Value $ 15,692,737
CIBC Asset Management Inc reports 14.30% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 12, 2026 - CIBC Asset Management Inc filed a 13F-HR form disclosing ownership of 72,457 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $15,692,737 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 84,551 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -14.30% 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 GALLAGHER ARTHUR J COM 363576109 72,457 -12,094 -14.30 15,693 -28.28 0.0384
2026-02-10 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 84,551 27,782 48.94 21,881 24.44 0.0528
2025-10-31 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 56,769 -7,614 -11.83 17,584 -14.69 0.0509
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 64,383 3,267 5.35 20,610 -2.32 0.0637
2025-05-13 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 61,116 12,802 26.50 21,100 53.86 0.0700
2025-01-31 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 48,314 5,198 12.06 13,714 13.04 0.0449
2024-11-06 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 43,116 2,190 5.35 12,132 14.31 0.0394
2024-08-01 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 40,926 -1,400 -3.31 10,613 0.27 0.0378
2024-05-09 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 42,326 951 2.30 10,583 13.75 0.0367
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 41,375 -8,162 -16.48 9,304 -17.59 0.0348
2023-10-30 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 49,537 -707 -1.41 11,291 2.34 0.0468
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 50,244 -728 -1.43 11,032 13.14 0.0423
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 50,972 1,722 3.50 9,751 5.02 0.0387
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 49,250 -3,176 -6.06 9,286 3.44 0.0390
2022-11-03 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 52,426 -82 -0.16 8,976 4.85 0.0394
2022-08-09 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 52,508 -22,227 -29.74 8,561 -34.39 0.0347
2022-05-06 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 74,735 -2,938 -3.78 13,049 -0.99 0.0458
2022-02-08 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 77,673 1,190 1.56 13,179 15.92 0.0482
2021-11-09 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 76,483 224 0.29 11,369 6.43 0.0458
2021-08-16 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 76,259 42,594 126.52 10,682 154.33 0.0432
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 33,665 17,347 106.31 4,200 108.02 0.0179
2021-02-03 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 16,318 -25 -0.15 2,019 17.04 0.0095
2020-11-05 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 16,343 -11,433 -41.16 1,725 -36.30 0.0088
2020-07-28 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 27,776 1,004 3.75 2,708 24.11 0.0159
2020-04-30 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 26,772 -689 -2.51 2,182 -16.56 0.0154
2020-02-14 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 27,461 3,309 13.70 2,615 20.90 0.0148
2019-10-30 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 24,152 339 1.42 2,163 3.69 0.0127
2019-08-05 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 23,813 1,490 6.67 2,086 19.68 0.0125
2019-05-06 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,323 197 0.89 1,743 6.87 0.0108
2019-02-12 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 22,126 2,366 11.97 1,631 10.88 0.0120
2018-11-02 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 19,760 -138 -0.69 1,471 13.24 0.0091
2018-08-09 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 19,898 995 5.26 1,299 0.00 0.0081
2018-04-30 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 18,903 -666 -3.40 1,299 4.93 0.0084
2018-02-02 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 19,569 -1,206 -5.81 1,238 -3.21 0.0076
2017-11-06 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 20,775 310 1.51 1,279 9.13 0.0080
2017-07-27 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 20,465 78 0.38 1,172 1.65 0.0081
2017-05-12 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 20,387 -948 -4.44 1,153 3.97 0.0079
2017-02-08 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 21,335 64 0.30 1,109 2.50 0.0080
2016-10-19 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 21,271 -1,399 -6.17 1,082 0.28 0.0080
2016-08-02 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 22,670 10,664 88.82 1,079 102.06 0.0081
2016-05-09 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 12,006 898 8.08 534 17.36 0.0040
2016-02-02 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 11,108 -768 -6.47 455 -7.14 0.0037
2015-11-03 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,876 -254 -2.09 490 -14.63 0.0039
2015-08-06 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,130 -117 -0.96 574 0.17 0.0040
2015-05-08 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 12,247 893 7.87 573 7.10 0.0041
2015-02-10 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 11,354 -1,308 -10.33 535 -6.79 0.0036
2014-11-05 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 12,662 -1,848 -12.74 574 -15.09 0.0034
2014-08-01 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 14,510 1,574 12.17 676 9.92 0.0038
2014-05-09 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 12,936 822 6.79 615 8.08 0.0036
2014-02-04 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 12,114 286 2.42 569 10.27 0.0035
2013-10-29 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,828 -670 -5.36 516 -5.49 0.0033
2013-10-02 2013-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 12,498 12,498 546 0.0037
2013-08-09 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,498 546 0.0037
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.