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

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionShell Asset Management Co
Latest Disclosed Ownership4,125 shares
Latest Disclosed Value $ 1,278
Shell Asset Management Co reports 38.74% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 4,125 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $1,277,678 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 6,734 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -38.74% during the quarter. The current value of the position is $870,375 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)
2025-11-07 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,125 -2,609 -38.74 1 -50.00 0.1284
2025-07-23 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 6,734 1,470 27.93 2 100.00 0.0744
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 5,264 -297 -5.34 2 0.00 0.0863
2025-02-14 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 5,561 -120 -2.11 2 0.00 0.0689
2024-11-07 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 5,681 3,282 136.81 2 0.0703
2024-07-25 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,399 348 16.97 1 0.0283
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,051 0 0.00 0 0.0213
2023-11-08 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,051 89 4.54 0 0.0193
2023-07-28 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,962 -182 -8.49 0 0.0170
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,144 0 0.00 0 0.0170
2023-02-07 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,144 2,144 0 0.0177
2021-11-04 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 0 -4,621 -100.00 0 -100.00
2021-08-12 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,621 820 21.57 647 36.50 0.0125
2021-05-10 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,801 -25,702 -87.12 474 -87.01 0.0095
2021-02-16 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 29,503 -2,660 -8.27 3,650 7.48 0.0754
2020-11-13 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 32,163 -2,848 -8.13 3,396 -0.50 0.0790
2020-08-10 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 35,011 -604 -1.70 3,413 17.57 0.0852
2020-05-11 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 35,615 -853 -2.34 2,903 -16.41 0.0809
2020-02-13 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 36,468 3,632 11.06 3,473 18.09 0.0748
2019-11-12 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 32,836 -5,918 -15.27 2,941 -13.35 0.0672
2019-08-12 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 38,754 17,188 79.70 3,394 101.54 0.0751
2019-05-09 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 21,566 462 2.19 1,684 8.30 0.0371
2019-02-13 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 21,104 6,831 47.86 1,555 46.42 0.0388
2018-11-13 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 14,273 529 3.85 1,062 18.39 0.0210
2018-08-10 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 13,744 2,322 20.33 897 14.27 0.0184
2018-05-14 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,422 2,162 23.35 785 33.96 0.0156
2018-02-09 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 9,260 0 0.00 586 2.81 0.0116
2017-10-20 2017-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 9,260 -329 -3.43 570 3.83 0.0127
2017-07-26 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 9,589 0 0.00 549 1.29 0.0136
2017-04-26 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,589 -732 -7.09 542 1.12 0.0138
2017-01-10 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 10,321 22 0.21 536 2.29 0.0145
2016-10-28 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 10,299 -2,668 -20.58 524 -15.07 0.0125
2016-07-25 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,967 3,375 35.19 617 44.50 0.0143
2016-05-11 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,592 3,043 46.47 427 59.33 0.0102
2016-02-05 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,549 6,549 0.00 268 0.0063
2015-10-13 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 0 -10,704 -100.00 0 -100.00
2015-07-30 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,704 -25,214 -70.20 506 -69.99 0.0101
2014-02-03 2013-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 35,918 5,813 19.31 1,686 28.31 0.0287
2014-01-27 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 35,918 1,686
2013-10-28 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 30,105 0 0.00 1,314 -0.08 0.0241
2013-08-01 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 30,105 30,105 1,315 0.0250
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.