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

SecurityAJG / Arthur J. Gallagher & Co.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership781,086 shares
Latest Disclosed Value $ 202,137,246
Alliancebernstein L.p. reports 1.52% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 781,086 shares of Arthur J. Gallagher & Co. (US:AJG) valued at $169,167,606 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 793,108 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -1.52% during the quarter. The current value of the position is $164,809,146 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)
2026-05-15 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 781,086 -12,022 -1.52 202,137 -1.52 0.0655
2026-02-17 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 793,108 -242,524 -23.42 205,248 -36.02 0.0648
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,035,632 -90,461 -8.03 320,777 -11.02 0.1010
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,126,093 -83,331 -6.89 360,485 -13.67 0.1176
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,209,424 271,014 28.88 417,542 56.75 0.1511
2025-02-12 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 938,410 693,006 282.39 266,368 285.77 0.0904
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 245,404 -2,478 -1.00 69,049 7.42 0.0232
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 247,882 -1,963 -0.79 64,278 2.89 0.0224
2024-05-14 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 249,845 -17,856 -6.67 62,471 3.77 0.0221
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 267,701 -733 -0.27 60,201 -1.61 0.0232
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 268,434 -8,868 -3.20 61,184 0.49 0.0260
2023-08-15 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 277,302 6,832 2.53 60,887 17.67 0.0248
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 270,470 -3,144 -1.15 51,744 0.30 0.0222
2023-02-15 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 273,614 -237 -0.09 51,587 10.02 0.0232
2022-11-15 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 273,851 -39,810 -12.69 46,889 -8.31 0.0227
2022-08-15 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 313,661 52,802 20.24 51,139 12.28 0.0234
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 260,859 -3,429 -1.30 45,546 1.57 0.0176
2022-02-14 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 264,288 -278 -0.11 44,842 14.02 0.0159
2021-11-10 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 264,566 -987 -0.37 39,328 5.72 0.0155
2021-07-30 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 265,553 11,878 4.68 37,199 17.53 0.0149
2021-05-06 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 253,675 -9,135 -3.48 31,651 -2.65 0.0139
2021-02-08 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 262,810 -11,304 -4.12 32,512 12.34 0.0153
2020-11-12 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 274,114 -571 -0.21 28,941 8.07 0.0156
2020-08-13 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 274,685 -25,087 -8.37 26,779 9.60 0.0157
2020-05-14 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 299,772 1,310 0.44 24,434 -14.03 0.0175
2020-02-18 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 298,462 -9,591 -3.11 28,423 3.01 0.0162
2019-11-14 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 308,053 1,153 0.38 27,592 2.64 0.0172
2019-08-14 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 306,900 -983,141 -76.21 26,881 -73.32 0.0167
2019-05-14 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,290,041 109,773 9.30 100,752 15.83 0.0656
2019-02-13 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 1,180,268 49,238 4.35 86,986 3.32 0.0646
2018-11-08 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,131,030 -71,516 -5.95 84,194 7.25 0.0550
2018-08-13 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,202,546 -53,249 -4.24 78,502 -9.05 0.0546
2018-05-14 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,255,795 940,566 298.38 86,311 332.68 0.0624
2018-02-13 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 315,229 -5,182 -1.62 19,948 1.15 0.0143
2017-11-13 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 320,411 -42,200 -11.64 19,721 -5.00 0.0148
2017-08-10 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 362,611 3,457 0.96 20,759 2.23 0.0161
2017-05-11 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 359,154 39,632 12.40 20,307 22.32 0.0162
2017-02-13 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 319,522 12,804 4.17 16,602 6.40 0.0138
2016-11-10 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 306,718 -329,243 -51.77 15,603 -48.46 0.0132
2016-08-11 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 635,961 -66,644 -9.49 30,272 -3.14 0.0261
2016-05-13 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 702,605 36,278 5.44 31,252 14.56 0.0266
2016-02-16 2015-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 666,327 111,091 20.01 27,279 19.02 0.0232
2016-02-12 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 666,327 27,506
2015-11-13 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 555,236 17,041 3.17 22,920 -9.96 0.0197
2015-08-14 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 538,195 58,833 12.27 25,456 13.59 0.0210
2015-05-13 2015-03-31 13F ARTHUR J GALLAGHER COM 363576109 479,362 -6,481 -1.33 22,410 -2.02 0.0182
2015-02-13 2014-12-31 13F ARTHUR J GALLAGHER COM 363576109 485,843 47,744 10.90 22,873 15.10 0.0190
2014-11-13 2014-09-30 13F ARTHUR J GALLAGHER COM 363576109 438,099 175,254 66.68 19,872 62.23 0.0167
2014-08-13 2014-06-30 13F ARTHUR J GALLAGHER COM 363576109 262,845 161,529 159.43 12,249 154.08 0.0103
2014-05-13 2014-03-31 13F ARTHUR J GALLAGHER COM 363576109 101,316 -5,119 -4.81 4,821 -3.48 0.0042
2014-02-13 2013-12-31 13F ARTHUR J GALLAGHER COM 363576109 106,435 -1,192 -1.11 4,995 6.32 0.0045
2013-11-14 2013-09-30 13F ARTHUR J GALLAGHER COM 363576109 107,627 -2,460 -2.23 4,698 -2.33 0.0046
2013-08-13 2013-06-30 13F ARTHUR J GALLAGHER COM 363576109 110,087 110,087 4,810 0.0051
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.