Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionRockefeller Capital Management L.P.
Latest Disclosed Ownership30,773 shares
Latest Disclosed Value $ 6,665,144
Rockefeller Capital Management L.P. reports 3.01% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - Rockefeller Capital Management L.P. filed a 13F-HR form disclosing ownership of 30,773 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $6,665,144 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 16, 2026 disclosing 29,873 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 3.01% 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 30,773 900 3.01 6,665 -13.78 0.0118
2026-03-16 2025-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 29,873 1,654 5.86 7,731 -11.56 0.0139
2026-02-14 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 29,881 1,662 7,733 0.0071
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 28,219 -490 -1.71 8,741 -4.90 0.0171
2025-08-14 2025-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 28,709 924 3.33 9,191 -4.19 0.0202
2025-08-08 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 28,709 924 9,191 0.0116
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 27,785 9,986 56.10 9,593 90.05 0.0237
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 17,799 49 0.28 5,047 1.16 0.0131
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 17,750 2,819 18.88 4,990 28.91 0.0134
2024-08-12 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 14,931 4,379 41.50 3,870 46.70 0.0110
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 10,552 10,552 2,639 0.0077
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 0 -8,968 -100.00 0 -100.00
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 8,968 341 3.95 1,969 196,800.00 0.0076
2023-05-16 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 8,627 457 5.59 2 -99.94 0.0071
2023-03-06 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,170 1,553 23.47 1,539 35.95 0.0077
2022-11-02 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 6,617 16 0.24 1,132 5.20 0.0059
2022-08-12 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 6,601 97 1.49 1,076 -5.20 0.0057
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 6,504 90 1.40 1,135 4.32 0.0055
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,414 -719 -10.08 1,088 2.64 0.0051
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,133 856 13.64 1,060 20.59 0.0056
2021-08-10 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 6,277 4,190 200.77 879 238.08 0.0050
2021-05-11 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,087 -56 -2.61 260 -1.52 0.0018
2021-02-12 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,143 826 62.72 264 89.93 0.0020
2020-11-13 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,317 172 15.02 139 24.11 0.0013
2020-08-12 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,145 -5,896 -83.74 112 -80.49 0.0012
2020-05-12 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 7,041 -150 -2.09 574 -16.20 0.0075
2020-02-07 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 7,191 -576 -7.42 685 -1.58 0.0085
2019-11-12 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,767 7,189 1,243.77 696 1,264.71 0.0094
2019-08-09 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 578 -421 -42.14 51 -34.62 0.0007
2019-05-10 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 999 862 629.20 78 680.00 0.0011
2019-02-12 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 137 0 0.00 10 0.00 0.0002
2018-11-02 2018-09-30 13F Gallagher Common 363576109 137 0 0.00 10 11.11 0.0002
2018-07-31 2018-06-30 13F Gallagher Common 363576109 137 137 9 0.0001
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.