Arthur J. Gallagher & Co. Acquires MCMM Services Limited

Arthur J. Gallagher & Co. Acquires MACK Insurance Services

August 5, 2025

Insurance

Arthur J. Gallagher & Co. has acquired Australia-based MACK Insurance Services, a commercial insurance broker focused on the agriculture sector. Lizzie Carver and her team will join Gallagher’s Australian brokerage operations from offices in Wagga Wagga and Narrandera, New South Wales; terms were not disclosed.

Arthur J. Gallagher & Co. Acquires RMA General Limited

March 3, 2025

Insurance

Arthur J. Gallagher & Co. acquired New Zealand-based insurance broker RMA General Limited; terms were not disclosed. RMA provides commercial and personal insurance as well as life and health solutions across New Zealand, and its team will join Gallagher's New Zealand retail brokerage operations to expand Gallagher's brokerage capabilities in the market.

Marsh McLennan Agency Acquires Arthur Hall Insurance

April 2, 2025

Insurance

Marsh McLennan Agency (MMA), a business of Marsh, has acquired Arthur Hall Insurance, a full-service insurance agency based in West Chester, Pennsylvania. The acquisition will bring Arthur Hall's commercial and personal lines expertise into MMA's network and establish a new MMA presence in Delaware; terms were not disclosed.

Arthur J. Gallagher & Co. Acquires Specialty Risk Management Services, LLC and Private Client Insurance Services, LLC

April 1, 2024

Insurance

Arthur J. Gallagher & Co. (Gallagher) acquired Fort Myers, Florida-based Specialty Risk Management Services, LLC and its affiliate Private Client Insurance Services, LLC. The acquired agencies — which manage property insurance programs for Florida businesses and provide commercial, condominium association and personal lines — will continue operating from their Fort Myers location with their current team under Gallagher's Southeast retail P/C leadership; terms were not disclosed.

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.

Arthur J. Gallagher & Co. Acquires Manchester Underwriting Agencies Limited

October 4, 2021

Insurance

Arthur J. Gallagher & Co., through its specialist underwriting subsidiary Pen Underwriting, acquired 100% of UK-based Manchester Underwriting Agencies Limited (and its subsidiary Manchester Underwriting Management Limited). Terms were not disclosed; founder Charles Manchester will continue to lead the business. The acquisition expands Pens specialist underwriting capabilities and adds a complementary book of professional indemnity and management liability business serving SMEs in the UK.