Arthur J. Gallagher & Co.
US ˙ NYSE ˙ US3635761097

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionKBC Group NV
Latest Disclosed Ownership122,358 shares
Latest Disclosed Value $ 26,500
KBC Group NV reports 14.84% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 122,358 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $26,500,296 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 143,679 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -14.84% during the quarter. The current value of the position is $24,777,495 USD.

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)
2026-05-07 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 122,358 -21,321 -14.84 26 -29.73 0.0342
2026-01-26 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 143,679 -13,035 -8.32 37 -22.92 0.0848
2026-01-20 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 156,714 9,752 6.64 49 2.13 0.1164
2025-08-08 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 146,962 -6,101 -3.99 47 -9.62 0.1271
2025-04-25 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 153,063 -6,315 -3.96 53 15.56 0.1640
2025-01-22 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 159,378 -38,990 -19.66 45 -18.18 0.1246
2024-11-06 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 198,368 53,106 36.56 56 48.65 0.1686
2024-07-17 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 145,262 82,645 131.98 38 146.67 0.1138
2024-05-08 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 62,617 2,881 4.82 16 15.38 0.0497
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 59,736 25,463 74.29 13 85.71 0.0476
2024-02-15 2023-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 34,273 -103,309 -75.09 8 -76.67 0.0319
2023-11-22 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 137,376 0 30 0.1256
2024-02-15 2023-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 137,582 -43,454 -24.00 30 -11.76 0.1242
2023-07-28 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 137,376 -43,454 30 0.1256
2024-02-14 2023-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 181,036 -23,929 -11.67 35 -10.53 0.1470
2023-05-04 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 180,830 28,162 35 0.1630
2024-02-14 2022-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 204,965 52,059 34.05 39 46.15 0.1875
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 152,668 -238 26 0.0001
2024-02-15 2022-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 152,906 35,410 30.14 26 36.84 0.1361
2022-11-08 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 152,668 35,172 26,140 0.1366
2024-02-14 2022-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 117,496 -42,047 -26.35 19 -29.63 0.0956
2022-07-26 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 117,209 -42,334 19,110 0.0962
2024-02-14 2022-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 159,543 64,604 68.05 28 68.75 0.1101
2022-05-06 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 159,543 64,604 27,856 0.1029
2024-02-14 2021-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 94,939 12,276 14.85 16 -99.87 0.0531
2022-02-03 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 94,939 12,276 16,108 0.0504
2021-11-10 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 82,663 -1,815 -2.15 12,288 3.84 0.0451
2022-02-15 2021-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 84,478 -4,157 -4.69 11,834 7.01 0.0427
2021-08-11 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 84,478 -4,157 11,834 0.0427
2022-02-14 2021-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 88,635 16,887 23.54 11,059 -87.54 0.0448
2021-04-26 2021-03-31 13F ARTHUR J GALLAGHER COM 363576109 88,635 16,887 11,059 0.0448
2022-02-14 2020-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 71,748 47,510 196.01 88,759 3,368.50 0.0418
2021-02-10 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 71,748 47,510 8,876 0.0409
2022-02-14 2020-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 24,238 3,049 14.39 2,559 23.86 0.0151
2020-10-28 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 24,238 3,049 2,559 0.0151
2022-02-14 2020-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 21,189 -3,327 -13.57 2,066 3.40 0.0137
2020-08-10 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 21,189 -3,327 2,066 0.0138
2020-05-04 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 24,516 -71,270 -74.41 1,998 -78.10 0.0167
2020-02-11 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 95,786 -31,459 -24.72 9,122 -19.96 0.0577
2019-11-07 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 127,245 -11,160 -8.06 11,397 -5.99 0.0836
2019-08-08 2019-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 138,405 -26,798 -16.22 12,123 -6.04 0.0939
2019-07-30 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 138,405 -100,966 12,123
2019-08-07 2019-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 165,203 104,202 170.82 12,902 186.97 0.1063
2019-05-10 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 165,203 104,202 12,902
2019-01-31 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 61,001 -67,520 -52.54 4,496 -53.01 0.0501
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 128,521 -26,727 -17.22 9,567 -5.60 0.0724
2018-08-03 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 155,248 12,723 8.93 10,135 3.46 0.0882
2018-08-03 2018-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 142,525 4,828 3.51 9,796 12.43 0.0906
2018-05-09 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 142,525 4,828 9,796
2018-08-03 2017-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 137,697 -9,845 -6.67 8,713 -4.05 0.0745
2018-02-07 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 137,697 -9,845 8,713
2017-11-13 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 147,542 79,346 116.35 9,081 132.61 0.0824
2017-08-04 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 68,196 806 1.20 3,904 2.47 0.0377
2017-05-10 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 67,390 4,619 7.36 3,810 16.80 0.0344
2017-02-16 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 62,771 20,894 49.89 3,262 53.15 0.0323
2016-11-03 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 41,877 7,682 22.47 2,130 30.84 0.0252
2016-08-03 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 34,195 -9,610 -21.94 1,628 -16.43 0.0233
2016-05-11 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 43,805 35,118 404.26 1,948 447.19 0.0324
2016-02-11 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,687 2,301 36.03 356 34.85 0.0066
2015-11-12 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 6,386 1,998 45.53 264 26.92 0.0053
2015-12-16 2015-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 4,388 4,388 0.00 208 0.0027
2015-07-31 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,388 208
2015-12-16 2015-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 0 0 0 0.0000
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.