Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionAmeriprise Financial Inc
Latest Disclosed Ownership239,340 shares
Latest Disclosed Value $ 51,966,351
Ameriprise Financial Inc reports 0.32% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Ameriprise Financial Inc filed a 13F-HR form disclosing ownership of 239,340 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $51,966,351 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 238,587 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 0.32% 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)
2026-05-15 2026-03-31 13F ARTHUR J GALLAGHER COM 363576109 239,340 753 0.32 51,966 -15.85 0.0022
2026-02-17 2025-12-31 13F ARTHUR J GALLAGHER COM 363576109 238,587 -900 -0.38 61,755 -16.75 0.0140
2025-11-14 2025-09-30 13F ARTHUR J GALLAGHER COM 363576109 239,487 18,168 8.21 74,178 5.04 0.0170
2025-08-14 2025-06-30 13F ARTHUR J GALLAGHER COM 363576109 221,319 -16,719 -7.02 70,620 -14.06 0.0174
2025-05-14 2025-03-31 13F ARTHUR J GALLAGHER COM 363576109 238,038 34,014 16.67 82,176 41.91 0.0222
2025-02-14 2024-12-31 13F ARTHUR J GALLAGHER COM 363576109 204,024 109,012 114.73 57,908 116.44 0.0149
2024-11-14 2024-09-30 13F ARTHUR J GALLAGHER COM 363576109 95,012 -1,445 -1.50 26,755 6.96 0.0069
2024-08-14 2024-06-30 13F ARTHUR J GALLAGHER COM 363576109 96,457 -11,514 -10.66 25,012 -7.34 0.0068
2024-05-15 2024-03-31 13F ARTHUR J GALLAGHER COM 363576109 107,971 -1,430 -1.31 26,995 9.71 0.0074
2024-02-14 2023-12-31 13F ARTHUR J GALLAGHER COM 363576109 109,401 551 0.51 24,606 -0.83 0.0074
2023-11-14 2023-09-30 13F ARTHUR J GALLAGHER COM 363576109 108,850 9,299 9.34 24,811 13.50 0.0081
2023-08-14 2023-06-30 13F ARTHUR J GALLAGHER COM 363576109 99,551 -29,928 -23.11 21,859 -11.75 0.0069
2023-05-22 2023-03-31 13F/A-1 ARTHUR J GALLAGHER COM 363576109 129,479 15,930 14.03 24,771 15.69 0.0081
2023-05-15 2023-03-31 13F GALAPAGOS NV-SPON ADR ADR 363576109 129,479 15,930 24,771 0.0015
2023-02-14 2022-12-31 13F ARTHUR J GALLAGHER COM 363576109 113,549 -3,598 -3.07 21,410 6.58 0.0073
2022-11-14 2022-09-30 13F ARTHUR J GALLAGHER COM 363576109 117,147 868 0.75 20,088 5.93 0.0074
2022-08-15 2022-06-30 13F ARTHUR J GALLAGHER COM 363576109 116,279 -10,020 -7.93 18,964 -13.12 0.0066
2022-05-16 2022-03-31 13F ARTHUR J GALLAGHER COM 363576109 126,299 -21,919 -14.79 21,828 -13.15 0.0064
2022-02-14 2021-12-31 13F ARTHUR J GALLAGHER COM 363576109 148,218 -658,930 -81.64 25,133 -79.05 0.0070
2021-11-15 2021-09-30 13F ARTHUR J GALLAGHER COM 363576109 807,148 -357,636 -30.70 119,987 -26.75 0.0383
2021-08-16 2021-06-30 13F ARTHUR J GALLAGHER COM 363576109 1,164,784 232,064 24.88 163,796 40.51 0.0506
2021-05-17 2021-03-31 13F ARTHUR J GALLAGHER COM 363576109 932,720 341,369 57.73 116,576 59.12 0.0387
2021-02-12 2020-12-31 13F ARTHUR J GALLAGHER COM 363576109 591,351 362,080 157.93 73,264 202.66 0.0260
2020-11-16 2020-09-30 13F ARTHUR J GALLAGHER COM 363576109 229,271 8,837 4.01 24,207 12.64 0.0098
2020-08-14 2020-06-30 13F ARTHUR J GALLAGHER COM 363576109 220,434 10,174 4.84 21,491 25.39 0.0092
2020-05-15 2020-03-31 13F ARTHUR J GALLAGHER COM 363576109 210,260 997 0.48 17,139 -14.00 0.0090
2020-02-14 2019-12-31 13F ARTHUR J GALLAGHER COM 363576109 209,263 228 0.11 19,929 6.44 0.0083
2019-11-14 2019-09-30 13F ARTHUR J GALLAGHER COM 363576109 209,035 -60,438 -22.43 18,723 -20.68 0.0084
2019-08-14 2019-06-30 13F ARTHUR J GALLAGHER COM 363576109 269,473 -32,187 -10.67 23,604 0.31 0.0106
2019-05-15 2019-03-31 13F ARTHUR J GALLAGHER COM 363576109 301,660 -9,473 -3.04 23,531 3.27 0.0108
2019-02-14 2018-12-31 13F ARTHUR J GALLAGHER COM 363576109 311,133 -13,318 -4.10 22,786 -5.66 0.0114
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 324,451 -349,915 -51.89 24,152 -45.14 0.0084
2018-08-14 2018-06-30 13F ARTHUR J GALLAGHER COM 363576109 674,366 -98,904 -12.79 44,024 -17.16 0.0195
2018-05-14 2018-03-31 13F ARTHUR J GALLAGHER COM 363576109 773,270 -28,723 -3.58 53,145 4.72 0.0240
2018-02-12 2017-12-31 13F ARTHUR J GALLAGHER COM 363576109 801,993 295,617 58.38 50,752 62.84 0.0231
2017-11-07 2017-09-30 13F ARTHUR J GALLAGHER COM 363576109 506,376 135,608 36.57 31,167 46.84 0.0148
2017-08-10 2017-06-30 13F ARTHUR J GALLAGHER COM 363576109 370,768 34,523 10.27 21,225 11.65 0.0106
2017-05-05 2017-03-31 13F ARTHUR J GALLAGHER COM 363576109 336,245 173,776 106.96 19,011 125.22 0.0098
2017-02-03 2016-12-31 13F ARTHUR J GALLAGHER COM 363576109 162,469 93,918 137.00 8,441 142.00 0.0046
2016-11-08 2016-09-30 13F ARTHUR J GALLAGHER COM 363576109 68,551 7,701 12.66 3,488 20.40 0.0020
2016-08-08 2016-06-30 13F ARTHUR J GALLAGHER COM 363576109 60,850 -605,462 -90.87 2,897 -90.23 0.0017
2016-05-12 2016-03-31 13F ARTHUR J GALLAGHER COM 363576109 666,312 243,841 57.72 29,638 71.36 0.0177
2016-02-11 2015-12-31 13F ARTHUR J GALLAGHER COM 363576109 422,471 -171 -0.04 17,296 -0.86 0.0102
2015-11-12 2015-09-30 13F ARTHUR J GALLAGHER COM 363576109 422,642 -344,167 -44.88 17,446 -51.90 0.0108
2015-08-13 2015-06-30 13F ARTHUR J GALLAGHER COM 363576109 766,809 -143,800 -15.79 36,271 -14.80 0.0206
2015-05-14 2015-03-31 13F ARTHUR J GALLAGHER COM 363576109 910,609 37,759 4.33 42,571 3.59 0.0244
2015-02-13 2014-12-31 13F ARTHUR J GALLAGHER COM 363576109 872,850 -5,286 -0.60 41,095 3.17 0.0239
2014-11-14 2014-09-30 13F ARTHUR J GALLAGHER COM 363576109 878,136 54,344 6.60 39,833 3.76 0.0240
2014-08-13 2014-06-30 13F ARTHUR J GALLAGHER COM 363576109 823,792 100,274 13.86 38,391 11.53 0.0227
2014-05-14 2014-03-31 13F ARTHUR J GALLAGHER COM 363576109 723,518 67,268 10.25 34,423 11.77 0.0207
2014-02-14 2013-12-31 13F ARTHUR J GALLAGHER COM 363576109 656,250 145,874 28.58 30,798 38.26 0.0187
2013-11-14 2013-09-30 13F ARTHUR J GALLAGHER COM 363576109 510,376 -9,037 -1.74 22,276 -1.82 0.0146
2013-08-14 2013-06-30 13F ARTHUR J GALLAGHER COM 363576109 519,413 519,413 22,690 0.0157
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.