Arthur J. Gallagher & Co.
US ˙ NYSE ˙ US3635761097

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionStrs Ohio
Latest Disclosed Ownership73,867 shares
Latest Disclosed Value $ 15,998,115
Strs Ohio reports 4.34% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On April 24, 2026 - Strs Ohio filed a 13F-HR form disclosing ownership of 73,867 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $15,998,115 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 77,216 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -4.34% during the quarter. The current value of the position is $15,585,937 USD.

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 ARTHUR J GALLAGHER COM_STK 363576109 73,867 -3,349 -4.34 15,998 -19.94 0.0635
2026-02-02 2025-12-31 13F ARTHUR J GALLAGHER COM_STK 363576109 77,216 17,435 29.16 19,983 7.92 0.0745
2025-10-30 2025-09-30 13F ARTHUR J GALLAGHER COM_STK 363576109 59,781 -42,553 -41.58 18,517 -43.48 0.0679
2025-08-04 2025-06-30 13F ARTHUR J GALLAGHER COM_STK 363576109 102,334 -10,666 -9.44 32,759 -16.03 0.1223
2025-05-28 2025-03-31 13F ARTHUR J GALLAGHER COM_STK 363576109 113,000 0 0.00 39,012 21.63 0.1634
2025-05-28 2024-12-31 13F ARTHUR J GALLAGHER COM_STK 363576109 113,000 -7,000 -5.83 32,075 -5.00 0.1272
2024-11-01 2024-09-30 13F ARTHUR J GALLAGHER COM_STK 363576109 120,000 0 0.00 33,764 8.51 0.1299
2024-08-05 2024-06-30 13F ARTHUR J GALLAGHER COM_STK 363576109 120,000 -52,000 -30.23 31,117 72,265.12 0.1230
2024-05-13 2024-03-31 13F ARTHUR J GALLAGHER COM_STK 363576109 172,000 511 0.30 43 13.16 0.1714
2024-01-30 2023-12-31 13F GALLAGHER (ARTHUR) J AND COM 363576109 171,489 -42,511 -19.86 39 -20.83 0.1605
2023-10-26 2023-09-30 13F/A-1 GALLAGHER (ARTHUR) J AND COM 363576109 214,000 -22,882 -9.66 49 -7.69 0.2171
2023-10-26 2023-09-30 13F GALLAGHER (ARTHUR) J AND COM 363576109 214,000 -22,882 49 0.2171
2023-07-31 2023-06-30 13F GALLAGHER (ARTHUR) J AND COM 363576109 236,882 -8,118 -3.31 52 13.04 0.2195
2023-08-02 2023-03-31 13F/A-2 GALLAGHER (ARTHUR) J AND COM 363576109 245,000 -29,836 -10.86 47 -9.80 0.2030
2023-08-02 2023-03-31 13F/A-1 GALLAGHER (ARTHUR) J AND COM 363576109 245,000 47
2023-04-27 2023-03-31 13F GALLAGHER (ARTHUR) J AND COM 363576109 245,000 -29,836 47 0.2419
2023-01-26 2022-12-31 13F GALLAGHER (ARTHUR) J AND COM 363576109 274,836 948 0.35 52 -99.89 0.2340
2022-10-27 2022-09-30 13F GALLAGHER (ARTHUR) J AND COM 363576109 273,888 -39,943 -12.73 46,895 -8.35 0.2234
2022-07-25 2022-06-30 13F GALLAGHER (ARTHUR) J AND COM 363576109 313,831 -22,732 -6.75 51,167 -12.93 0.2305
2022-04-21 2022-03-31 13F GALLAGHER (ARTHUR) J AND COM 363576109 336,563 319,502 1,872.70 58,763 1,930.51 0.2150
2022-01-24 2021-12-31 13F GALLAGHER (ARTHUR) J AND COM 363576109 17,061 12,670 288.54 2,894 343.87 0.0100
2021-10-22 2021-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 4,391 -679 -13.39 652 -8.17 0.0025
2021-07-26 2021-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 5,070 2,853 128.69 710 157.25 0.0026
2021-04-23 2021-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 2,217 -206,000 -98.94 276 -98.93 0.0010
2021-01-25 2020-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 208,217 -31,172 -13.02 25,758 1.92 0.0994
2020-12-14 2020-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 239,389 0 0.00 25,274 8.30 0.1058
2020-07-23 2020-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 239,389 11,862 5.21 23,338 25.85 0.1020
2020-04-23 2020-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 227,527 193,836 575.33 18,545 478.09 0.0976
2020-01-24 2019-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 33,691 6,005 21.69 3,208 29.41 0.0134
2019-10-21 2019-09-30 13F/A-1 GALLAGHER (ARTHUR) J COM 363576109 27,686 -619 -2.19 2,479 0.00 0.0109
2019-10-21 2019-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 27,686 -6,005 2,479 10,972.1915
2019-07-25 2019-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 28,305 -88 -0.31 2,479 11.82 0.0110
2019-04-19 2019-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 28,393 -917 -3.13 2,217 2.64 0.0101
2019-01-23 2018-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 29,310 -2,211 -7.01 2,160 -7.93 0.0110
2018-10-19 2018-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 31,521 1,675 5.61 2,346 20.43 0.0103
2018-08-06 2018-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 29,846 -963 -3.13 1,948 -7.98 0.0084
2018-04-20 2018-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 30,809 -605,474 -95.16 2,117 -94.74 0.0094
2018-01-23 2017-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 636,283 -364,111 -36.40 40,263 -34.61 0.1720
2017-10-23 2017-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,000,394 62 0.01 61,574 7.52 0.2644
2017-07-26 2017-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,000,332 -220,821 -18.08 57,269 -17.05 0.2551
2017-04-26 2017-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 1,221,153 -302,592 -19.86 69,043 -12.79 0.2991
2017-01-24 2016-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 1,523,745 -160,178 -9.51 79,173 -7.57 0.3488
2016-10-27 2016-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,683,923 -28,712 -1.68 85,661 5.08 0.3827
2016-07-26 2016-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,712,635 26,437 1.57 81,521 8.69 0.3624
2016-04-25 2016-03-31 13F/A-1 GALLAGHER (ARTHUR) J COM 363576109 1,686,198 -225,802 -11.81 75,002 -4.18 0.3369
2016-01-28 2015-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 1,912,000 -1,860 -0.10 78,277 -0.92 0.3500
2015-10-21 2015-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,913,860 52,860 2.84 79,004 -10.25 0.3759
2015-08-04 2015-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,861,000 0 0.00 88,025 1.18 0.3865
2015-04-27 2015-03-31 13F/A-1 GALLAGHER (ARTHUR) J COM 363576109 1,861,000 106,000 6.04 87,001 5.30 0.3837
2015-04-21 2015-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 1,861,000 87,001
2015-01-23 2014-12-31 13F GALLAGHER (ARTHUR) J COM 363576109 1,755,000 400,000 29.52 82,625 34.43 0.3582
2014-10-29 2014-09-30 13F/A-1 GALLAGHER (ARTHUR) J COM 363576109 1,355,000 600,000 79.47 61,463 74.70 0.2714
2014-10-20 2014-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 1,355,000 61,463
2014-07-24 2014-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 755,000 480,000 174.55 35,183 168.90 0.1568
2014-04-28 2014-03-31 13F GALLAGHER (ARTHUR) J COM 363576109 275,000 275,000 13,084 0.0589
2013-10-24 2013-09-30 13F GALLAGHER (ARTHUR) J COM 363576109 0 -715,000 -100.00 0 -100.00
2013-08-12 2013-06-30 13F GALLAGHER (ARTHUR) J COM 363576109 715,000 715,000 31,238 0.1343
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.