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Arthur J. Gallagher & Co.

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13F filer, CIK 354190, ROLLING MEADOWS, IL

Arthur J. Gallagher & Co. filed a 13F-NT notice for the quarter ended 2026-06-30 on 2026-08-14.

Filed (acceptance time not in the bulk data set), ingested 13F-NT 0000354190-26-000189

This filer reports no holdings of its own for Q2 2026. It filed a 13F-NT notice, and its holdings are in the report of . How notices are handled.

Changes against Q1 2026 are not shown: it was a notice, with the holdings in another manager's report (0 positions on file), so every position would read as new.

How Q2 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-NT 0000354190-26-000189 notice2026-08-14acceptance time not in the bulk data set

Filings

Every filing of this filer: 13F reports and notices, the 13D and 13G it filed or is a reporting person of, and Forms 3, 4 and 5 it reported as an owner.

FilingSubjectFiledAcceptedIngested
13F-NT 0000354190-26-000189 Quarter ended 2026-06-302026-08-14acceptance time not in the bulk data set
13F-NT 0000354190-26-000159 Quarter ended 2026-03-312026-05-15acceptance time not in the bulk data set
13F-NT 0000354190-26-000005 Quarter ended 2025-12-312026-02-17acceptance time not in the bulk data set
13F-NT 0000354190-25-000042 Quarter ended 2025-09-302025-11-14acceptance time not in the bulk data set
13F-NT 0001085146-25-005271 Quarter ended 2025-06-302025-08-14acceptance time not in the bulk data set
13F-NT 0001085146-25-003317 Quarter ended 2025-03-312025-05-15acceptance time not in the bulk data set
13F-NT 0001085146-25-001709 Quarter ended 2024-12-312025-02-14acceptance time not in the bulk data set
13F-NT 0001085146-24-005946 Quarter ended 2024-09-302024-11-14acceptance time not in the bulk data set
13F-NT 0001085146-24-003990 Quarter ended 2024-06-302024-08-14acceptance time not in the bulk data set
13F-NT 0001085146-24-002628 Quarter ended 2024-03-312024-05-15acceptance time not in the bulk data set
13F-NT 0001085146-24-001472 Quarter ended 2023-12-312024-02-14acceptance time not in the bulk data set
13F-NT 0001085146-23-004486 Quarter ended 2023-09-302023-11-14acceptance time not in the bulk data set
13F-NT 0001085146-23-003442 Quarter ended 2023-06-302023-08-14acceptance time not in the bulk data set
13F-NT 0001085146-23-002356 Quarter ended 2023-03-312023-05-15acceptance time not in the bulk data set
13F-NT/A 0001683168-23-001144 Quarter ended 2022-12-312023-02-27acceptance time not in the bulk data set
13F-NT 0001683168-23-000899 Quarter ended 2022-12-312023-02-14acceptance time not in the bulk data set
13F-NT 0001683168-22-007592 Quarter ended 2022-09-302022-11-14acceptance time not in the bulk data set
13F-NT 0001683168-22-005650 Quarter ended 2022-06-302022-08-15acceptance time not in the bulk data set
13F-NT 0001683168-22-003532 Quarter ended 2022-03-312022-05-13acceptance time not in the bulk data set
13F-NT 0001683168-22-000922 Quarter ended 2021-12-312022-02-14acceptance time not in the bulk data set
13F-NT 0001683168-21-005464 Quarter ended 2021-09-302021-11-12acceptance time not in the bulk data set
13F-NT 0001683168-21-003515 Quarter ended 2021-06-302021-08-13acceptance time not in the bulk data set
13F-NT 0001683168-21-001973 Quarter ended 2021-03-312021-05-14acceptance time not in the bulk data set
13F-NT 0001683168-21-000506 Quarter ended 2020-12-312021-02-12acceptance time not in the bulk data set
13F-NT 0001683168-20-003879 Quarter ended 2020-09-302020-11-13acceptance time not in the bulk data set
13F-NT 0001683168-20-002693 Quarter ended 2020-06-302020-08-14acceptance time not in the bulk data set
13F-NT 0001683168-20-001498 Quarter ended 2020-03-312020-05-12acceptance time not in the bulk data set
13F-NT 0001683168-20-000488 Quarter ended 2019-12-312020-02-14acceptance time not in the bulk data set
13F-NT 0001683168-19-003589 Quarter ended 2019-09-302019-11-14acceptance time not in the bulk data set
13F-NT 0001683168-19-002581 Quarter ended 2019-06-302019-08-14acceptance time not in the bulk data set
13F-NT 0001683168-19-001461 Quarter ended 2019-03-312019-05-10acceptance time not in the bulk data set
13F-NT 0001683168-19-000335 Quarter ended 2018-12-312019-02-12acceptance time not in the bulk data set
13F-NT 0001683168-18-003351 Quarter ended 2018-09-302018-11-13acceptance time not in the bulk data set
13F-NT 0001683168-18-002298 Quarter ended 2018-06-302018-08-14acceptance time not in the bulk data set
13F-NT 0001683168-18-001326 Quarter ended 2018-03-312018-05-15acceptance time not in the bulk data set
13F-NT 0001683168-18-000370 Quarter ended 2017-12-312018-02-12acceptance time not in the bulk data set
13F-NT 0001683168-17-002915 Quarter ended 2017-09-302017-11-13acceptance time not in the bulk data set
13F-NT 0001683168-17-002039 Quarter ended 2017-06-302017-08-11acceptance time not in the bulk data set
13F-NT 0001683168-17-001167 Quarter ended 2017-03-312017-05-11acceptance time not in the bulk data set
13F-NT 0001683168-17-000308 Quarter ended 2016-12-312017-02-13acceptance time not in the bulk data set
13F-NT 0001683168-16-000570 Quarter ended 2016-09-302016-11-14acceptance time not in the bulk data set
13F-NT 0001019687-16-007185 Quarter ended 2016-06-302016-08-12acceptance time not in the bulk data set
13F-NT 0001019687-16-006236 Quarter ended 2016-03-312016-05-13acceptance time not in the bulk data set
13F-NT 0001019687-16-005147 Quarter ended 2015-12-312016-02-12acceptance time not in the bulk data set
13F-NT 0001019687-15-003973 Quarter ended 2015-09-302015-11-10acceptance time not in the bulk data set
13F-NT 0001019687-15-003011 Quarter ended 2015-06-302015-08-10acceptance time not in the bulk data set
13F-NT 0001019687-15-001919 Quarter ended 2015-03-312015-05-14acceptance time not in the bulk data set
13F-NT 0001019687-15-000588 Quarter ended 2014-12-312015-02-17acceptance time not in the bulk data set
13F-NT 0001019687-14-004176 Quarter ended 2014-09-302014-11-12acceptance time not in the bulk data set
13F-NT 0001019687-14-003116 Quarter ended 2014-06-302014-08-14acceptance time not in the bulk data set
13F-NT 0001019687-14-001790 Quarter ended 2014-03-312014-05-13acceptance time not in the bulk data set
13F-NT 0001019687-14-000453 Quarter ended 2013-12-312014-02-11acceptance time not in the bulk data set
13F-HR 0001019687-13-004164 Quarter ended 2013-09-302013-11-12acceptance time not in the bulk data set
13F-HR 0001019687-13-003049 Quarter ended 2013-06-302013-08-13acceptance time not in the bulk data set