Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionBrookmont Capital Management
Latest Disclosed Ownership16,508 shares
Latest Disclosed Value $ 3,575,260
Brookmont Capital Management reports 4.67% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Brookmont Capital Management filed a 13F-HR form disclosing ownership of 16,508 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $3,575,260 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 15,772 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 4.67% 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)
2026-05-15 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 16,508 736 4.67 3,575 -12.40 2.0021
2026-02-10 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 15,772 -16 -0.10 4,082 -16.54 2.3616
2025-11-10 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 15,788 -747 -4.52 4,890 -7.61 2.7186
2025-07-18 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 16,535 -446 -2.63 5,293 -9.71 3.0344
2025-05-12 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 16,981 -1,251 -6.86 5,863 13.28 3.3078
2025-01-16 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 18,232 -2,596 -12.46 5,175 -11.69 2.7662
2024-10-16 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 20,828 -1,495 -6.70 5,860 1.24 3.0136
2024-07-17 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 22,323 513 2.35 5,789 6.14 3.1659
2024-04-16 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 21,810 -256 -1.16 5,453 9.90 2.8677
2024-01-18 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 22,066 -97 -0.44 4,962 -1.76 2.7782
2023-10-12 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 22,163 -108 -0.48 5,052 3.29 3.1498
2023-07-13 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 22,271 -406 -1.79 4,890 12.72 2.9477
2023-04-11 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,677 -183 -0.80 4,338 0.67 2.7291
2023-02-07 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 22,860 -1,181 -4.91 4,310 4.69 2.6472
2022-10-12 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 24,041 640 2.73 4,116 7.89 2.8584
2022-08-15 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 23,401 -698 -2.90 3,815 -9.34 2.6272
2022-05-09 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 24,099 -165 -0.68 4,208 2.21 2.5269
2022-01-27 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 24,264 -1,076 -4.25 4,117 9.29 2.1774
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 25,340 -175 -0.69 3,767 5.40 2.2214
2021-07-19 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 25,515 -142 -0.55 3,574 11.65 2.1618
2021-04-15 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 25,657 -833 -3.14 3,201 -2.32 2.0623
2021-02-04 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 26,490 -3,117 -10.53 3,277 4.83 2.3093
2020-10-16 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 29,607 528 1.82 3,126 10.26 2.3233
2020-07-23 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 29,079 -6,435 -18.12 2,835 -2.07 2.2694
2020-04-28 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 35,514 -3,778 -9.62 2,895 -22.63 2.3321
2020-01-22 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 39,292 -2,844 -6.75 3,742 -0.85 2.2333
2019-11-07 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 42,136 -898 -2.09 3,774 0.13 2.1532
2019-07-18 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 43,034 205 0.48 3,769 12.68 2.2661
2019-04-16 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 42,829 29 0.07 3,345 6.06 2.0594
2019-02-12 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 42,800 -4,312 -9.15 3,154 -10.07 2.1467
2018-11-08 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 47,112 -65 -0.14 3,507 13.86 2.0904
2018-07-19 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 47,177 -527 -1.10 3,080 -6.07 1.9376
2018-05-14 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 47,704 -45,327 -48.72 3,279 -44.30 2.1695
2018-02-12 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 93,031 27,137 41.18 5,887 45.14 2.5380
2017-11-13 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 65,894 -57,258 -46.49 4,056 -42.47 2.2209
2017-08-11 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 123,152 -6,177 -4.78 7,050 -3.58 2.6588
2017-05-12 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 129,329 -2,802 -2.12 7,312 6.50 2.7042
2017-02-13 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 132,131 -13,618 -9.34 6,866 -7.39 2.7051
2016-11-10 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 145,749 -168 -0.12 7,414 6.74 2.7634
2016-08-08 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 145,917 -32,796 -18.35 6,946 -12.62 2.5302
2016-05-12 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 178,713 -26,510 -12.92 7,949 -5.39 2.5461
2016-02-02 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 205,223 -5,337 -2.53 8,402 -3.34 2.3876
2015-11-06 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 210,560 712 0.34 8,692 -12.43 2.4858
2015-07-21 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 209,848 -2,159 -1.02 9,926 0.15 2.5128
2015-05-05 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 212,007 212,007 0.00 9,911 2.4822
2015-01-30 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -205,970 -100.00 0 -100.00
2014-10-17 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 205,970 -4,173 -1.99 9,343 -4.60 2.3902
2014-08-08 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 210,143 26,167 14.22 9,793 11.87 2.3599
2014-05-01 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 183,976 -1,859 -1.00 8,754 0.38 2.4057
2014-02-03 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 185,835 16,007 9.43 8,721 17.64 2.4057
2013-10-16 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 169,828 30,473 21.87 7,413 21.76 2.4131
2013-07-17 2013-06-30 13F GALLAGHER ARTHUR J COM 363576109 139,355 139,355 6,088 2.5223
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.