

UK events are highlighted in bold.
| Date | Event |
| 1903 | Lumley formed in London |
| 1914 | Wesfarmers Limited formed |
| 1919 | Wesfarmers begins insurance operation |
| 1937 | Lumley commences underwriting in Australia and New Zealand |
| 1976 | OAMPS formed in Australia |
| 1978 | Crombie Lockwood formed |
| 1984 | Wesfarmers Limited publicly listed |
| 1986 | OAMPS launched in the UK, registering the company name OAMPS (UK) Ltd OAMPS Petrochemical appointed as the Insurance Manager for The Federation of Petroleum Suppliers (FPS) |
| 1991 | Wesfarmers Insurance acquires Federation Insurance |
| 1993 | Wesfarmers Insurance becomes Wesfarmers Federation Insurance |
| 1999 | OAMPS Petrochemical - Zurich insurance appointed as Scheme Motor Underwriters |
| 2000 | OAMPS Petrochemical appointed as the Insurance Manager for The Oil Recycling Association (ORA) |
| 2001 | OAMPS Petrochemical - QBE appointed as Scheme Commercial Combined Underwriters |
| 2002 | OHES Environmental was formed. OAMPS UK Group purchased Fairmont Insurance Brokers and rebranded as OAMPS Special Risks. OAMPS Insurance Brokers acquires Peter Sellers. |
| 2003 | Wesfarmers Insurance division acquires Lumley Group. ORS Risk Management began operating OAMPS Special Risks became the first Australian domiciled Lloyds Broker |
| 2004 | OAMPS Insurance Brokers acquires Sandown Insurance. |
| 2005 | OAMPS Insurance Brokers launches new Fish Fryers Scheme OAMPS Completes 60th acquisition and becomes fastest growing broker in Australia and the 3rd largest Australian Insurance Broker |
| 2005 | OAMPS Special Risk moves in to new offices less than 50 yards from Lloyds of London. OAMPS UK Group enter UK top 100 Brokers Crombie Lockwood becomes New Zealand’s largest domestic broker |
| 2006 | OAMPS Insurance Brokers acquires Jacey Insurance Brokers Wesfarmers Insurance Division acquires OAMPS Group |
| 2006 | OAMPS Petrochemical appointed as the Insurance Manager for UKSpill Association |
| 2007 | Wesfarmers Insurance Division acquires Crombie Lockwood OAMPS Insurance Brokers acquires Whichers Boylan James and Keith Johnson & Co. Wesfarmers Insurance Division reaches record revenue of $1.4 billion. OAMPS Insurance Brokers moves in to larger offices in Reigate. |
| 2008 | OAMPS Petrochemical appointed as the Insurance Manager for UKLPG. OAMPS Petrochemical appointed as the Insurance Manager for The Hazchem Network. Wesfamers acquire Coles and become the second largest employer in Australia |
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