Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership191,075 shares
Latest Disclosed Value $ 41,383,023
Standard Life Aberdeen plc reports 3.62% increase in ownership of AJG / Arthur J. Gallagher & Co.

On April 29, 2026 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 191,075 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $41,383,023 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 184,399 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 3.62% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-29 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 191,075 6,676 3.62 41,383 -13.28 0.0363
2026-01-16 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 184,399 -2,026 -1.09 47,721 -16.27 0.0739
2025-11-07 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 186,425 46,629 33.36 56,992 27.35 0.0901
2025-07-24 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 139,796 5,211 3.87 44,751 -3.15 0.0761
2025-05-13 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 134,585 72,804 117.84 46,206 163.43 0.0901
2025-01-24 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 61,781 -10,055 -14.00 17,540 -12.63 0.0329
2024-10-25 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 71,836 12,488 21.04 20,076 30.45 0.0368
2024-08-09 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 59,348 -30,831 -34.19 15,390 -31.75 0.0295
2024-05-09 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 90,179 1,128 1.27 22,548 12.60 0.0442
2024-01-31 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 89,051 36,645 69.93 20,026 67.66 0.0434
2023-11-07 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 52,406 -1,156 -2.16 11,945 1.56 0.0305
2024-06-20 2023-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 53,562 -602 -1.11 11,761 13.49 0.0274
2023-08-04 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 53,562 -602 11,761 0.0274
2024-06-20 2023-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 54,164 -5 -0.01 10,362 1.46 0.0259
2023-04-28 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 54,164 -5 10,362 0.0259
2024-06-20 2022-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 54,169 4,054 8.09 10,213 19.02 0.0278
2023-02-10 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 54,169 4,054 10,213 0.0278
2022-11-10 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 50,115 -1,901 -3.65 8,581 1.33 0.0255
2022-08-05 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 52,016 -434 -0.83 8,468 -8.45 0.0266
2022-05-04 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 52,450 -16,607 -24.05 9,250 -21.05 0.0237
2022-02-10 2021-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 69,057 -4,054 -5.54 11,717 6.62 0.0257
2022-02-08 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 69,057 -4,054 11,717 0.0084
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 73,111 -4,840 -6.21 10,990 0.65 0.0248
2021-08-10 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 77,951 -3,860 -4.72 10,919 6.95 0.0239
2021-05-06 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 81,811 3,444 4.39 10,209 5.30 0.0232
2021-02-10 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 78,367 3,034 4.03 9,695 21.89 0.0236
2020-10-21 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 75,333 -8,130 -9.74 7,954 -2.25 0.0212
2020-08-10 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 83,463 -4,872 -5.52 8,137 13.01 0.0220
2020-05-13 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 88,335 -1,698 -1.89 7,200 -16.03 0.0229
2020-02-18 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 90,033 -2,606 -2.81 8,574 3.34 0.0207
2019-11-13 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 92,639 -1,448 -1.54 8,297 0.69 0.0207
2019-08-13 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 94,087 -1,846 -1.92 8,240 9.98 0.0183
2019-05-14 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 95,933 23,775 32.95 7,492 43.61 0.0162
2019-02-12 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 72,158 -1,266 -1.72 5,217 -4.56 0.0124
2018-11-20 2018-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 73,424 5,417 7.97 5,466 23.14 0.0102
2018-11-13 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 73,424 5,417 5,466
2018-08-09 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 68,007 10,624 18.51 4,439 12.55 0.0085
2018-05-15 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 57,383 -797,182 -93.29 3,944 -92.71 0.0078
2018-02-12 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 854,565 -1,165,469 -57.70 54,082 -56.51 0.1035
2017-11-14 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,020,034 2,020,034 124,343 0.2267
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.