Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership27,518 shares
Latest Disclosed Value $ 5,977,668
Advisor Group Holdings, Inc. reports 31.10% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 27,518 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $5,977,668 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 39,938 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -31.10% 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 GALLAGHER ARTHUR J COM 363576109 27,518 -12,420 -31.10 5,978 -42.25 0.0051
2026-02-17 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 39,938 -75,053 -65.27 10,350 -70.84 0.0151
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 114,991 70,774 160.06 35,490 144.05 0.0497
2025-09-04 2025-06-30 13F/A-1 ALLAGHER ARTHUR J COM 363576109 44,217 22,001 99.03 14,542 89.52 0.0259
2025-08-13 2025-06-30 13F ALLAGHER ARTHUR J COM 363576109 33,931 11,715 10,931 0.0126
2025-05-12 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,216 -15,378 -40.91 7,674 19.85 0.0171
2025-06-06 2024-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 37,594 15,207 67.93 6,403 1.62 0.0144
2025-02-07 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 36,060 13,673 5,949 0.0152
2024-11-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 22,387 -12,436 -35.71 6,301 -30.24 0.0142
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 34,823 3,645 11.69 9,031 15.84 0.0213
2024-05-10 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 31,178 -103,133 -76.79 7,796 -74.23 0.0174
2024-02-12 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 134,311 -66,629 -33.16 30,254 -34.01 0.0529
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 200,940 47,495 30.95 45,849 35.97 0.0678
2023-08-21 2023-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 153,445 -3,079 -1.97 33,721 12.42 0.0605
2023-08-10 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 179,236 22,712 33,695 0.0091
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 156,524 10,665 7.31 29,995 8.96 0.0564
2023-02-10 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 145,859 787 0.54 27,528 10.72 0.0557
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 145,072 28,839 24.81 24,862 31.05 0.0568
2022-08-10 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 116,233 9,074 8.47 18,972 2.98 0.0418
2022-05-04 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 107,159 4,160 4.04 18,423 5.36 0.0358
2022-02-03 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 102,999 17,591 20.60 17,485 37.51 0.0331
2021-11-05 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 85,408 4,664 5.78 12,715 12.33 0.0265
2021-08-02 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 80,744 7,213 9.81 11,319 23.26 0.0245
2021-05-13 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 73,531 -2,399 -3.16 9,183 -2.27 0.0221
2021-02-10 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 75,930 9,081 13.58 9,396 33.33 0.0251
2020-11-12 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 66,849 7,029 11.75 7,047 20.81 0.0211
2020-08-14 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 59,820 6,357 11.89 5,833 33.78 0.0196
2020-05-18 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 53,463 53,463 4,360 0.0178
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.