Arthur J. Gallagher & Co. Acquires Krose GmbH & Co KG

Arthur J. Gallagher & Co. Acquires Rosenzweig Insurance Agency, Inc.

October 23, 2023

Insurance

Arthur J. Gallagher & Co. acquired Mineola, New York-based Rosenzweig Insurance Agency, Inc.; terms were not disclosed. Rosenzweig will operate as part of Gallagher Agency Alliance and will remain in its current location, enhancing Gallagher's small-business property/casualty and employee benefits capabilities.

Arthur J. Gallagher & Co. Acquires Bremer Insurance Agencies, Inc.

September 9, 2025

Insurance

Arthur J. Gallagher & Co. has acquired St. Paul–based Bremer Insurance Agencies, Inc., a subsidiary of Old National Bancorp; terms were not disclosed. The acquisition expands Gallagher's retail property/casualty brokerage footprint in the Upper Midwest, with Travis Hoaglund and his team joining Gallagher's Great Lakes region retail P/C operations.

Arthur J. Gallagher & Co. (Gallagher Re) Acquires MGB Re

January 16, 2024

Insurance

Arthur J. Gallagher & Co., through its reinsurance division Gallagher Re, has acquired Toronto-based MGB Re. The acquisition will expand Gallagher Re's medical reinsurance capabilities and bring MGB's leadership team into Gallagher Re's North America operations; terms were not disclosed.

Gallagher Bassett (Arthur J. Gallagher) Acquires Reck & Co.

February 3, 2026

Insurance

Gallagher Bassett, the claims and risk management subsidiary of Arthur J. Gallagher & Co., has acquired Reck & Co. GmbH, a Bremen-based specialist in marine and transport claims, surveying, and recovery services. The Reck & Co. team will remain in Bremen under existing leadership and will be integrated into Gallagher Bassett's Europe operations to deepen marine and transport claims capabilities across Europe; terms were not disclosed.

Arthur J. Gallagher / Gallagher Re Acquires Bay Risk Services Limited

March 6, 2023

Insurance

Arthur J. Gallagher & Co., through its reinsurance division Gallagher Re, has acquired the business and assets of UK-based Lloyd’s broker Bay Risk Services Limited, a member of the Optio Group. Bay Risk, founded in 2016 and specializing in structuring and placing delegated underwriting authority (binder) business for program managers, MGAs and Lloyd’s coverholders, will join Gallagher Re’s global programs practice; the existing Bay Risk leadership team will remain in place. Terms were not disclosed.

Arthur J. Gallagher & Co. Acquires Cornerstone Commercial & Personal Insurance Services, Inc.

July 1, 2024

Insurance

Arthur J. Gallagher & Co. acquired Rancho Cucamonga, California–based Cornerstone Commercial & Personal Insurance Services, Inc.; terms were not disclosed. Cornerstone’s founders Phil and Allison Hakopian and their team will remain in place, joining Gallagher’s Southwest retail property/casualty brokerage under Scott Firestone to strengthen Gallagher’s homeowners association and regional commercial insurance capabilities.