Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionRoundview Capital LLC
Latest Disclosed Ownership2,476 shares
Latest Disclosed Value $ 536,253
Roundview Capital LLC reports 3.69% increase in ownership of AJG / Arthur J. Gallagher & Co.

On May 8, 2026 - Roundview Capital LLC filed a 13F-HR form disclosing ownership of 2,476 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $536,253 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 2,388 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 3.69% 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.

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)
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,476 88 3.69 536 -13.13 0.0334
2026-02-09 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 -2,988 -55.58 618 -62.94 0.0380
2025-11-12 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 5,376 2,980 124.37 1,665 117.08 0.1053
2025-07-23 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,396 -43 -1.76 767 -8.91 0.0513
2025-05-06 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,439 10 0.41 842 22.21 0.0608
2025-02-12 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,429 0 0.00 689 0.88 0.0481
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,429 33 1.38 683 9.98 0.0495
2024-08-09 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,396 0 0.00 621 3.67 0.0489
2024-05-06 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,396 8 0.34 599 11.55 0.0490
2024-02-12 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 537 -1.29 0.0495
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 544 3.82 0.0547
2023-08-09 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 524 14.91 0.0512
2023-05-09 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 457 1.33 0.0478
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 450 10.02 0.0514
2022-11-10 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 409 5.14 0.0516
2022-08-11 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 389 -6.71 0.0466
2022-05-17 2022-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 417 2.96 0.0428
2022-05-11 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 417 0.0414
2022-02-10 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 405 14.08 0.0404
2021-11-10 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 355 5.97 0.0391
2021-08-10 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 335 12.42 0.0374
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 298 1.02 0.0375
2021-02-08 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 295 17.06 0.0404
2020-11-05 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 252 8.15 0.0395
2020-08-13 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 2,388 233 0.0396
2020-05-11 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -2,388 -100.00 0 -100.00
2020-02-10 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 227 6.07 0.0431
2019-11-12 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 0 0.00 214 2.39 0.0462
2019-08-12 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,388 2,388 209 0.0471
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.