Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionDnB Asset Management AS
Latest Disclosed Ownership56,631 shares
Latest Disclosed Value $ 12,265,142
DnB Asset Management AS reports 12.69% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - DnB Asset Management AS filed a 13F-HR form disclosing ownership of 56,631 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $12,265,142 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 50,255 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 12.69% 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)
2026-05-14 2026-03-31 13F Arthur J Gallagher COM 363576109 56,631 6,376 12.69 12,265 -5.69 0.0437
2026-02-05 2025-12-31 13F Arthur J Gallagher COM 363576109 50,255 722 1.46 13,005 -15.23 0.0454
2025-11-12 2025-09-30 13F Arthur J Gallagher COM 363576109 49,533 1,023 2.11 15,342 -1.20 0.0574
2025-08-12 2025-06-30 13F Arthur J Gallagher COM 363576109 48,510 4,432 10.05 15,529 2.05 0.0644
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 44,078 -1,321 -2.91 15,217 18.09 0.0701
2025-02-12 2024-12-31 13F Arthur J Gallagher COM 363576109 45,399 8,719 23.77 12,887 24.86 0.0558
2024-11-12 2024-09-30 13F Arthur J Gallagher COM 363576109 36,680 1,207 3.40 10,321 12.20 0.0466
2024-07-05 2024-06-30 13F Arthur J Gallagher common 363576109 35,473 2,246 6.76 9,199 10.71 0.0439
2024-04-12 2024-03-31 13F Arthur J Gallagher common 363576109 33,227 -5,202 -13.54 8,308 -3.85 0.0433
2024-01-04 2023-12-31 13F Arthur J Gallagher common 363576109 38,429 3,546 10.17 8,642 8.69 0.0449
2023-10-13 2023-09-30 13F Arthur J Gallagher common 363576109 34,883 1,253 3.73 7,951 7.67 0.0475
2023-07-10 2023-06-30 13F/A-1 Arthur J Gallagher common 363576109 33,630 -740 -2.15 7,384 12.30 0.0425
2023-07-06 2023-06-30 13F Arthur J Gallagher common 363576109 33,630 -740 7,384 0.0435
2023-04-20 2023-03-31 13F Arthur J Gallagher common 363576109 34,370 1,821 5.59 6,575 7.15 0.0417
2023-01-12 2022-12-31 13F Arthur J Gallagher common 363576109 32,549 1,745 5.66 6,137 16.34 0.0433
2022-10-11 2022-09-30 13F Arthur J Gallagher common 363576109 30,804 365 1.20 5,274 6.29 0.0407
2022-07-08 2022-06-30 13F Arthur J Gallagher common 363576109 30,439 630 2.11 4,963 -4.65 0.0349
2022-04-08 2022-03-31 13F Arthur J Gallagher common 363576109 29,809 1,682 5.98 5,205 9.05 0.0309
2022-01-12 2021-12-31 13F Arthur J Gallagher common 363576109 28,127 1,891 7.21 4,772 22.39 0.0280
2021-10-15 2021-09-30 13F Arthur J Gallagher common 363576109 26,236 1,844 7.56 3,900 14.14 0.0253
2021-07-06 2021-06-30 13F Arthur J Gallagher common 363576109 24,392 597 2.51 3,417 15.09 0.0226
2021-04-15 2021-03-31 13F Arthur J Gallagher common 363576109 23,795 1,942 8.89 2,969 9.80 0.0217
2021-01-19 2020-12-31 13F Arthur J Gallagher common 363576109 21,853 3,081 16.41 2,703 36.45 0.0237
2020-10-14 2020-09-30 13F Arthur J Gallagher common 363576109 18,772 624 3.44 1,982 11.98 0.0211
2020-07-08 2020-06-30 13F Arthur J Gallagher common 363576109 18,148 708 4.06 1,769 24.49 0.0208
2020-04-17 2020-03-31 13F Arthur J Gallagher common 363576109 17,440 -3,824 -17.98 1,422 -29.79 0.0209
2020-01-13 2019-12-31 13F Arthur J Gallagher common 363576109 21,264 2,320 12.25 2,025 19.34 0.0199
2019-10-16 2019-09-30 13F Arthur J Gallagher common 363576109 18,944 -804 -4.07 1,697 -1.91 0.0191
2019-07-08 2019-06-30 13F Arthur J Gallagher common 363576109 19,748 -1,662 -7.76 1,730 3.41 0.0199
2019-04-11 2019-03-31 13F Arthur J Gallagher common 363576109 21,410 610 2.93 1,672 9.14 0.0191
2019-01-15 2018-12-31 13F Arthur J Gallagher common 363576109 20,800 -1,100 -5.02 1,533 -6.01 0.0199
2018-10-10 2018-09-30 13F Arthur J Gallagher common 363576109 21,900 -2,500 -10.25 1,630 2.39 0.0183
2018-07-06 2018-06-30 13F Arthur J Gallagher common 363576109 24,400 2,000 8.93 1,593 3.44 0.0188
2018-04-11 2018-03-31 13F Arthur J Gallagher common 363576109 22,400 2,000 9.80 1,540 19.30 0.0185
2018-01-10 2017-12-31 13F Arthur J Gallagher common 363576109 20,400 -2,600 -11.30 1,291 -8.83 0.0156
2017-10-11 2017-09-30 13F Arthur J Gallagher common 363576109 23,000 0 0.00 1,416 7.52 0.0188
2017-07-06 2017-06-30 13F Arthur J Gallagher common 363576109 23,000 4,100 21.69 1,317 23.22 0.0192
2017-04-19 2017-03-31 13F Arthur J Gallagher common 363576109 18,900 3,700 24.34 1,069 35.36 0.0168
2017-01-17 2016-12-31 13F Arthur J Gallagher common 363576109 15,200 200 1.33 790 3.41 0.0145
2016-10-28 2016-09-30 13F Arthur J Gallagher common 363576109 15,000 600 4.17 763 11.39 0.0150
2016-07-08 2016-06-30 13F Arthur J Gallagher common 363576109 14,400 -300 -2.04 685 4.90 0.0145
2016-04-11 2016-03-31 13F Arthur J Gallagher common 363576109 14,700 14,700 654 0.0137
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.