Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionVontobel Holding Ltd.
Latest Disclosed Ownership11,777 shares
Latest Disclosed Value $ 2,550,662
Vontobel Holding Ltd. reports 8.80% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 8, 2026 - Vontobel Holding Ltd. filed a 13F-HR form disclosing ownership of 11,777 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $2,550,662 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,824 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 8.80% 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)
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,777 953 8.80 2,551 -8.96 0.0024
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 10,824 -9,732 -47.34 2,801 -56.01 0.0088
2025-10-15 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 20,556 -1,088 -5.03 6,367 -8.10 0.0192
2025-07-23 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 21,644 -536 -2.42 6,929 -9.52 0.0221
2025-04-28 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,180 -3,321 -13.02 7,657 5.79 0.0279
2025-01-30 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 25,501 638 2.57 7,238 3.47 0.0248
2024-10-16 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 24,863 1,451 6.20 6,996 15.24 0.0226
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 23,412 -1,505 -6.04 6,071 -2.57 0.0197
2024-05-10 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 24,917 623 2.56 6,230 14.04 0.0498
2024-06-04 2023-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 24,294 14,170 139.96 5,463 136.80 0.0458
2024-01-30 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 34,973 14,725 7,865 0.0395
2024-06-04 2023-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 10,124 7,000 224.07 2,308 236.79 0.0213
2023-10-11 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 20,248 14,000 4,615 0.0257
2024-06-04 2023-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 3,124 -159 -4.84 686 9.08 0.0060
2023-07-24 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 6,248 2,965 1,372 0.0073
2024-06-04 2023-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 3,283 -440 -11.82 628 -10.16 0.0058
2023-04-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 6,566 2,843 1,256 0.0071
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 3,723 646 20.99 700 32.64 0.0071
2022-11-04 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 3,077 179 6.18 527 11.42 0.0062
2022-07-27 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,898 -411 -12.42 473 -17.74 0.0051
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,309 -3,512 -51.49 575 -50.09 0.0050
2022-02-14 2021-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 6,821 3,520 106.63 1,152 134.62 0.0096
2022-02-10 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 3,301 0 491 0.0019
2021-10-29 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 3,301 128 4.03 491 9.60 0.0043
2021-08-06 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 3,173 -173 -5.17 448 7.43 0.0039
2021-05-11 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,346 -1,585 -32.14 417 -28.10 0.0031
2021-02-12 2020-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 4,931 4,931 580 0.0038
2021-02-12 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,931 580 0.0038
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.