Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionGotham Asset Management, LLC
ManagerJoel Greenblatt
Latest Disclosed Ownership63,607 shares
Latest Disclosed Value $ 13,776,004
Gotham Asset Management, LLC reports 40.52% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Gotham Asset Management, LLC filed a 13F-HR form disclosing ownership of 63,607 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $13,776,004 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 45,264 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 40.52% 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 63,607 18,343 40.52 13,776 17.61 0.0422
2026-02-17 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 45,264 -1,398 -3.00 11,714 -18.96 0.0428
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 46,662 11,402 32.34 14,453 28.05 0.0629
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 35,260 6,264 21.60 11,287 12.76 0.0675
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 28,996 -1,377 -4.53 10,011 16.11 0.0835
2025-02-14 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 30,373 -4,849 -13.77 8,621 -13.01 0.0817
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 35,222 9,229 35.51 9,910 47.03 0.1025
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 25,993 6,953 36.52 6,740 41.60 0.0873
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 19,040 -1,068 -5.31 4,761 5.29 0.0719
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 20,108 -1,307 -6.10 4,522 -7.38 0.0839
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 21,415 -6,209 -22.48 4,881 -19.52 0.1008
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 27,624 15,697 131.61 6,065 165.89 0.1319
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,927 3,656 44.20 2,282 46.31 0.0553
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,271 -1,275 -13.36 1,559 -4.59 0.0439
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 9,546 -1,089 -10.24 1,634 -5.77 0.0489
2022-08-15 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,635 6,578 162.14 1,734 144.92 0.0557
2022-05-16 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,057 -7,504 -64.91 708 -63.91 0.0219
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 11,561 -5,073 -30.50 1,962 -20.66 0.0633
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 16,634 1,140 7.36 2,473 13.96 0.1003
2021-08-16 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 15,494 4,416 39.86 2,170 57.02 0.0919
2021-05-17 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,078 -5,831 -34.48 1,382 -33.94 0.0616
2021-02-16 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 16,909 11,220 197.22 2,092 248.09 0.0692
2020-11-16 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 5,689 5,689 601 0.0193
2020-05-15 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -3,596 -100.00 0 -100.00
2020-02-14 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 3,596 -67,111 -94.91 342 -94.60 0.0063
2019-11-14 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 70,707 8,270 13.25 6,333 15.80 0.1119
2019-08-14 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 62,437 58,095 1,337.98 5,469 1,513.27 0.0873
2019-05-15 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,342 -1,551 -26.32 339 -21.89 0.0050
2019-02-14 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 5,893 -41,905 -87.67 434 -87.80 0.0067
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 47,798 4,537 10.49 3,558 25.99 0.0491
2018-08-14 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 43,261 39,759 1,135.32 2,824 1,071.78 0.0408
2018-05-15 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 3,502 3,502 241 0.0034
2016-05-16 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -6,158 -100.00 0 -100.00
2016-02-16 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,158 -44,350 -87.81 252 -87.91 0.0027
2015-11-16 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 50,508 50,508 2,085 0.0203
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.