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

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionNatixis
Latest Disclosed Ownership22,524 shares
Latest Disclosed Value $ 4,878,248
Natixis reports 66.21% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 14, 2026 - Natixis filed a 13F-HR form disclosing ownership of 22,524 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $4,878,248 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 66,649 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -66.21% during the quarter. The current value of the position is $4,561,110 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.

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)
2026-05-14 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 22,524 -44,125 -66.21 4,878 -71.72 0.0158
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 66,649 -38,677 -36.72 17,248 -47.13 0.0612
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 105,326 64,825 160.06 32,624 151.62 0.1513
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 40,501 28,654 241.87 12,965 218.24 0.0575
2025-07-18 2025-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 11,847 5,024 73.63 4,075 110.43 0.0222
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,847 5,024 4,075 0.0224
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,823 1,917 39.07 1,937 40.29 0.0118
2024-11-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,906 2,824 135.64 1,380 156.03 0.0078
2024-08-13 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,082 1,017 95.49 540 102.63 0.0031
2024-05-13 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,065 -46,360 -97.75 266 -97.51 0.0014
2024-02-13 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 47,425 2,788 6.25 10,665 4.82 0.0775
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 44,637 32,667 272.91 10,174 287.14 0.0779
2023-08-11 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 11,970 -65,168 -84.48 2,628 -82.19 0.0213
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 77,138 59,969 349.29 14,757 355.89 0.1331
2023-02-24 2022-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 17,169 3,886 29.26 3,237 42.35 0.0182
2023-02-13 2022-12-31 13F Arthur J. Gallagher COM 363576109 23,283 10,000 4,390 0.0102
2022-11-14 2022-09-30 13F Arthur J. Gallagher COM 363576109 13,283 3,838 40.64 2,274 47.66 0.0106
2022-08-12 2022-06-30 13F Arthur J. Gallagher COM 363576109 9,445 -80,330 -89.48 1,540 -90.18 0.0056
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 89,775 34,839 63.42 15,675 68.17 0.0546
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 54,936 -168,055 -75.36 9,321 -71.88 0.0318
2021-11-12 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 222,991 109,679 96.79 33,148 108.83 0.1146
2021-08-13 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 113,312 -279,120 -71.13 15,873 -67.58 0.0693
2021-05-14 2021-03-31 13F GALLAGHER ARTHUR J CO 363576109 392,432 309,148 371.20 48,964 375.24 0.1601
2021-02-12 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 83,284 47,081 130.05 10,303 169.57 0.0374
2020-11-12 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 36,203 32,365 843.28 3,822 921.93 0.0281
2020-08-13 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 3,838 3,838 374 0.0029
2020-05-14 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -49,788 -100.00 0 -100.00
2020-02-14 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 49,788 40,579 440.65 4,725 472.73 0.0293
2019-11-13 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 9,209 -74,955 -89.06 825 -88.81 0.0053
2019-08-13 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 84,164 3,448 4.27 7,372 18.41 0.0583
2019-05-15 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 80,716 -85,515 -51.44 6,226 -49.18 0.0392
2019-02-14 2018-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 166,231 -35,910 -17.76 12,251 -18.58 0.1009
2019-02-14 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 166,231 -35,910 12,251
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 202,141 -64,937 -24.31 15,047 -13.70 0.0870
2018-08-14 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 267,078 218,340 447.99 17,435 420.45 0.0923
2018-05-15 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 48,738 -15,583 -24.23 3,350 -17.69 0.0206
2018-02-14 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 64,321 64,321 4,070 0.0313
2017-11-14 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 0 -100,261 -100.00 0 -100.00
2017-08-14 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 100,261 26,014 35.04 5,740 36.73 0.0652
2017-05-15 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 74,247 54,338 272.93 4,198 306.00 0.0523
2017-02-14 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 19,909 10,730 116.90 1,034 121.41 0.0107
2016-11-14 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 9,179 9,179 467 0.0054
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.