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

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionInvesco Ltd.
Latest Disclosed Ownership1,715,812 shares
Latest Disclosed Value $ 371,610,634
Invesco Ltd. reports 1.00% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 12, 2026 - Invesco Ltd. filed a 13F-HR form disclosing ownership of 1,715,812 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $371,610,563 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 19, 2026 disclosing 1,733,169 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -1.00% during the quarter. The current value of the position is $362,036,332 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)
2026-05-12 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,715,812 -17,357 -1.00 371,611 -17.15 0.0569
2026-02-19 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,733,169 85,545 5.19 448,527 -12.11 0.0688
2025-11-13 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,647,624 -707,008 -30.03 510,335 -32.30 0.0804
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,354,632 503,205 27.18 753,765 17.93 0.1282
2025-05-12 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,851,427 -45,615 -2.40 639,187 18.70 0.1211
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,897,042 -34,252 -1.77 538,475 -0.91 0.0996
2024-11-12 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,931,294 -187,258 -8.84 543,408 -1.08 0.1049
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,118,552 -161,769 -7.09 549,362 -3.65 0.1162
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,280,321 -84,470 -3.57 570,171 7.22 0.1225
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,364,791 -207,391 -8.06 531,794 -9.29 0.1265
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,572,182 88,861 3.58 586,277 7.52 0.1579
2023-08-11 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,483,321 266,267 12.01 545,263 28.56 0.1429
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,217,054 -297,890 -11.84 424,145 -10.55 0.1183
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,514,944 35,561 1.43 474,168 11.69 0.1389
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,479,383 -184,565 -6.93 424,520 -2.26 0.1366
2022-08-15 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,663,948 111,816 4.38 434,331 -2.53 0.1316
2022-05-16 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,552,132 -260,719 -9.27 445,605 -6.63 0.1137
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,812,851 509,546 22.12 477,257 39.39 0.1150
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,303,305 63,891 2.85 342,387 9.15 0.0868
2021-08-17 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,239,414 -101,156 -4.32 313,696 7.42 0.0772
2021-05-17 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,340,570 167,385 7.70 292,033 8.63 0.0779
2021-02-16 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,173,185 684,667 46.00 268,845 71.07 0.0782
2020-11-16 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,488,518 -788,955 -34.64 157,158 -29.22 0.0531
2020-08-14 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,277,473 -1,382,443 -37.77 222,032 -25.57 0.0794
2020-05-15 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,659,916 -415,031 -10.18 298,319 -23.12 0.1256
2020-02-14 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,074,947 -373,823 -8.40 388,057 -2.61 0.1205
2019-11-14 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,448,770 335,313 8.15 398,476 10.60 0.1042
2019-08-14 2019-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 4,113,457 1,397,053 51.43 360,298 69.83 0.0927
2019-08-14 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,113,457 -2,691,361 360,298
2019-05-15 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,716,404 256,737 10.44 212,151 17.03 0.0715
2019-02-14 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,459,667 -134,476 -5.18 181,277 -6.13 0.0694
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,594,143 -212,085 -7.56 193,108 5.41 0.0608
2018-08-14 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,806,228 574,661 25.75 183,190 19.44 0.0606
2018-05-15 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,231,567 -879,187 -28.26 153,376 -22.08 0.0573
2018-02-14 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 3,110,754 -488,978 -13.58 196,847 -11.16 0.0710
2017-11-14 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 3,599,732 -226,799 -5.93 221,563 1.14 0.0818
2017-08-14 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 3,826,531 77,834 2.08 219,070 3.36 0.0682
2017-05-15 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,748,697 -13,612 -0.36 211,951 8.42 0.0696
2017-02-14 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 3,762,309 -293,927 -7.25 195,489 -5.26 0.0657
2016-11-14 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,056,236 1,470,597 56.88 206,340 67.65 0.0709
2016-08-15 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,585,639 145,107 5.95 123,077 13.38 0.0452
2016-05-16 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,440,532 68,629 2.89 108,555 11.79 0.0441
2016-02-16 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,371,903 -454,551 -16.08 97,106 -16.77 0.0387
2015-11-16 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,826,454 922,995 48.49 116,676 29.59 0.0495
2015-08-14 2015-06-30 13F GALLAGHER COMMON 363576109 1,903,459 4,994 0.26 90,034 1.44 0.0353
2015-05-15 2015-03-31 13F GALLAGHER COMMON 363576109 1,898,465 73,520 4.03 88,753 3.30 0.0343
2015-02-13 2014-12-31 13F GALLAGHER COMMON 363576109 1,824,945 478,434 35.53 85,919 40.67 0.0332
2014-11-14 2014-09-30 13F GALLAGHER COMMON 363576109 1,346,511 52,205 4.03 61,078 1.27 0.0244
2014-08-14 2014-06-30 13F GALLAGHER COMMON 363576109 1,294,306 1,191,211 1,155.45 60,315 1,129.41 0.0237
2014-05-15 2014-03-31 13F GALLAGHER COMMON 363576109 103,095 -644,351 -86.21 4,906 -86.01 0.0020
2014-02-13 2013-12-31 13F GALLAGHER COMMON 363576109 747,446 20,258 2.79 35,079 10.51 0.0139
2013-11-13 2013-09-30 13F GALLAGHER COMMON 363576109 727,188 7,193 1.00 31,742 0.91 0.0138
2013-08-14 2013-06-30 13F GALLAGHER COMMON 363576109 719,995 719,995 31,456 0.0147
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.