Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionCIBC World Markets Inc.
Latest Disclosed Ownership6,145 shares
Latest Disclosed Value $ 1,330,884
CIBC World Markets Inc. reports 82.70% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - CIBC World Markets Inc. filed a 13F-HR form disclosing ownership of 6,145 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $1,330,884 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 35,523 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -82.70% 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 6,145 -29,378 -82.70 1,331 -85.53 0.0022
2026-02-10 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 35,523 228 0.65 9,193 -15.92 0.0148
2025-11-06 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 35,295 -2,697 -7.10 10,932 -10.11 0.0196
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 37,992 -9,086 -19.30 12,162 -25.18 0.0241
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 47,078 28,476 153.08 16,253 324,960.00 0.0348
2025-01-23 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 18,602 1,384 8.04 5 25.00 0.0111
2024-11-12 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 17,218 262 1.55 5 0.00 0.0101
2024-08-07 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 16,956 -55 -0.32 4 0.00 0.0101
2024-05-13 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 17,011 108 0.64 4 33.33 0.0101
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 16,903 -4,414 -20.71 4 -25.00 0.0096
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 21,317 -255 -1.18 5 0.00 0.0160
2023-08-11 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 21,572 -706 -3.17 5 0.00 0.0151
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,278 -1,142 -4.88 4 0.00 0.0144
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 23,420 -137 -0.58 4 -99.90 0.0156
2022-11-10 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 23,557 7,795 49.45 4,033 56.93 0.0155
2022-08-10 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 15,762 -486 -2.99 2,570 -9.41 0.0090
2022-05-12 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 16,248 -17 -0.10 2,837 2.79 0.0090
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 16,265 -263 -1.59 2,760 12.33 0.0079
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 16,528 -6 -0.04 2,457 6.09 0.0081
2021-08-12 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 16,534 -16,215 -49.51 2,316 -43.32 0.0065
2021-05-11 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 32,749 1,173 3.71 4,086 4.61 0.0119
2021-02-08 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 31,576 13,040 70.35 3,906 99.59 0.0124
2020-11-12 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 18,536 4,143 28.78 1,957 39.49 0.0085
2020-08-13 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 14,393 4,490 45.34 1,403 73.85 0.0063
2020-05-15 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,903 -3,632 -26.83 807 -37.39 0.0041
2020-02-13 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 13,535 251 1.89 1,289 8.32 0.0053
2019-11-13 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 13,284 418 3.25 1,190 5.59 0.0053
2019-08-08 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,866 73 0.57 1,127 12.81 0.0050
2019-05-09 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 12,793 646 5.32 999 11.62 0.0046
2019-02-13 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 12,147 -7,371 -37.77 895 -38.40 0.0046
2018-11-09 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 19,518 15,251 357.42 1,453 420.79 0.0062
2018-08-08 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,267 1,214 39.76 279 32.86 0.0012
2018-05-18 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,053 3,053 210 0.0009
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.