Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionNational Asset Management, Inc.
Latest Disclosed Ownership1,340 shares
Latest Disclosed Value $ 289,333
National Asset Management, Inc. reports 17.18% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On April 24, 2026 - National Asset Management, Inc. filed a 13F-HR form disclosing ownership of 1,340 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $289,333 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,618 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -17.18% 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)
2026-04-24 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,340 -278 -17.18 289 -30.86 0.0183
2026-02-17 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,618 -1,802 -52.69 419 -60.53 0.0193
2025-10-31 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 3,420 -202 -5.58 1,059 -8.63 0.0490
2025-08-19 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 3,622 -5,844 -61.74 1,160 -56.85 0.0544
2025-02-25 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 9,466 -1,609 -14.53 2,687 -13.97 0.0881
2024-12-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,075 -385 -3.36 3,122 5.08 0.0868
2024-12-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 11,075 3,122
2024-08-19 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 11,460 -977 -7.86 2,972 4.83 0.0756
2024-05-16 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 12,437 1,773 16.63 2,835 18.18 0.0767
2024-03-15 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 10,664 -1,773 -14.26 2,398 -15.38 0.0646
2023-12-01 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 12,437 2,421 24.17 2,835 28.88 0.0767
2023-07-27 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,016 60 0.60 2,199 15.49 0.0493
2023-05-17 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,956 1,154 13.11 1,905 14.77 0.0507
2023-03-15 2022-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 8,802 56 0.64 1,660 10.75 0.0465
2023-02-21 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,802 56 1,660 0.0418
2022-11-22 2022-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 8,746 6,409 274.24 1,498 292.15 0.0452
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 8,746 6,409 1,498 0.0217
2022-08-12 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,337 -10 -0.43 382 -7.06 0.0161
2022-05-02 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,347 -4,099 -63.59 411 -62.43 0.0135
2022-01-28 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,446 139 2.20 1,094 16.76 0.0315
2021-11-16 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 6,307 1,555 32.72 937 40.90 0.0298
2021-08-10 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,752 294 6.59 665 19.39 0.0216
2021-05-13 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,458 -29 -0.65 557 0.00 0.0197
2021-02-04 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,487 -2,858 -38.91 557 -27.85 0.0298
2020-11-09 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,345 -3,082 -29.56 772 -24.17 0.0412
2020-07-31 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,427 -153 -1.45 1,018 17.96 0.0680
2020-05-06 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 10,580 930 9.64 863 -6.20 0.0736
2020-02-10 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 9,650 2,474 34.48 920 42.86 0.0783
2019-11-12 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,176 1,480 25.98 644 29.06 0.0634
2019-08-05 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 5,696 1,095 23.80 499 38.61 0.0547
2019-05-08 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,601 -38 -0.82 360 4.96 0.0450
2019-02-08 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,639 -33 -0.71 343 -1.72 0.0488
2018-11-08 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,672 46 0.99 349 15.18 0.0415
2018-10-04 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,626 -56 -1.20 303 -5.90 0.0400
2018-05-15 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,682 -155 -3.20 322 4.89 0.0451
2018-02-15 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,837 -32 -0.66 307 1.99 0.0415
2017-11-13 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,869 -12 -0.25 301 7.50 0.0500
2017-08-15 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,881 33 0.68 280 1.82 0.0508
2017-05-15 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,848 585 13.72 275 23.32 0.0548
2017-02-14 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,263 197 4.85 223 7.21 0.0453
2016-11-14 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,066 -823 -16.83 208 -11.11 0.0408
2016-08-15 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,889 0 0.00 234 7.83 0.0468
2016-05-16 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,889 4,889 0.00 217 0.0502
2015-05-14 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -511 -100.00 0 -100.00
2015-02-18 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 511 511 0.00 24 0.0005
2014-11-14 2014-09-30 13F Gallagher Arthur J Mid Value 363576109 0 -533 -100.00 0 -100.00
2014-08-14 2014-06-30 13F Gallagher Arthur J Mid Value 363576109 533 -6,514 -92.44 25 -92.21 0.0058
2013-10-21 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,047 7,047 308 0.1053
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.