Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionColonial Trust Advisors
Latest Disclosed Ownership2,110 shares
Latest Disclosed Value $ 456,984
Colonial Trust Advisors ownership in AJG / Arthur J. Gallagher & Co.

On May 12, 2026 - Colonial Trust Advisors filed a 13F-HR form disclosing ownership of 2,110 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $456,984 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,110 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 0.00% 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)
2026-05-12 2026-03-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 457 -16.48 0.0355
2026-02-12 2025-12-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 546 -16.39 0.0411
2025-11-10 2025-09-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 654 -3.26 0.0503
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 675 -7.28 0.0558
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 728 21.74 0.0648
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 599 0.84 0.0531
2024-11-12 2024-09-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 0 0.00 594 8.41 0.0513
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,110 -1 -0.05 547 3.80 0.0524
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,111 -4 -0.19 528 10.95 0.0522
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,115 0 0.00 476 -1.45 0.0505
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,115 -50 -2.31 482 1.47 0.0552
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,165 50 2.36 475 17.57 0.0528
2023-05-11 2023-03-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,115 -1 -0.05 405 1.51 0.0475
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,116 0 0.00 399 9.94 0.0489
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J & CO COM Stock 363576109 2,116 6 0.28 362 5.23 0.0490
2022-08-12 2022-06-30 13F ARTHUR J. GALLAGHER &CO. ISIN# CS 363576109 2,110 -303 -12.56 344 -18.29 0.0484
2022-05-09 2022-03-31 13F ARTHUR J GALLAGHER & CO ISIN#U CS 363576109 2,413 -447 -15.63 421 -13.20 0.0498
2022-02-14 2021-12-31 13F ARTHUR J GALLAGHER & CO ISIN#U CS 363576109 2,860 0 0.00 485 14.12 0.0543
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J CS 363576109 2,860 -250 -8.04 425 -2.52 0.0524
2021-08-05 2021-06-30 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 436 12.37 0.0532
2021-05-10 2021-03-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 388 0.78 0.0510
2021-01-29 2020-12-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 385 17.38 0.0534
2020-10-26 2020-09-30 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 328 8.25 0.0515
2020-08-10 2020-06-30 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 303 19.76 0.0517
2020-05-06 2020-03-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 253 -14.53 0.0529
2020-02-14 2019-12-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 296 6.09 0.0491
2019-11-15 2019-09-30 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 279 2.57 0.0493
2019-08-21 2019-06-30 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 0 0.00 272 11.93 0.0492
2019-05-15 2019-03-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 3,110 -14,500 -82.34 243 -81.28 0.0461
2019-02-11 2018-12-31 13F GALLAGHER(ARTHUR J.)&COCOM USD CS 363576109 17,610 0 0.00 1,298 -0.99 0.3170
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 17,610 0 0.00 1,311 14.00 0.2452
2018-08-14 2018-06-30 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 17,610 0 0.00 1,150 -4.96 0.2279
2018-05-09 2018-03-31 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 17,610 -2,525 -12.54 1,210 -5.02 0.2467
2018-02-21 2017-12-31 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 20,135 2,525 14.34 1,274 17.53 0.1975
2017-11-14 2017-09-30 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 17,610 0 0.00 1,084 7.54 0.2381
2017-08-14 2017-06-30 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 17,610 1,000 6.02 1,008 10.04 0.2288
2017-05-15 2017-03-31 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 16,610 0 0.00 916 6.14 0.2818
2017-02-13 2016-12-31 13F GALLAGHER ARTHUR J & CO ISIN#U CS 363576109 16,610 0 0.00 863 2.13 0.2786
2016-10-18 2016-09-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 845 6.83 0.2654
2016-08-22 2016-06-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 791 7.04 0.2531
2016-05-13 2016-03-31 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 739 8.68 0.2412
2016-02-12 2015-12-31 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 680 -0.87 0.2261
2015-11-18 2015-09-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 686 -12.72 0.2304
2015-08-05 2015-06-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 786 1.16 0.2436
2015-06-01 2015-03-31 13F GALLAGHER ARTHUR J CS 363576109 16,610 16,610 0.00 777 0.2374
2015-02-13 2014-12-31 13F GALLAGHER ARTHUR J CS 363576109 0 -16,610 -100.00 0 -100.00
2014-11-14 2014-09-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 753 -2.71 0.2332
2014-08-14 2014-06-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 774 -2.03 0.2352
2014-05-15 2014-03-31 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 790 1.28 0.2470
2014-02-14 2013-12-31 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 780 7.59 0.2450
2013-11-14 2013-09-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 0 0.00 725 -0.14 0.2455
2013-08-14 2013-06-30 13F GALLAGHER ARTHUR J CS 363576109 16,610 16,610 726 0.2573
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.