Why Liberty Mutual? Since 1912, we at Liberty Mutual have committed ourselves to providing broad, useful and competitively-priced insurance products and services to meet our customers ever-changing needs.Our delivery on this commitment is the reason we're now the 5th largest P&C insurance company in the United States, why we've earned an A.M. Best Co. ‘A' (Excellent) rating, and why we have the breadth, depth and financial strength that you can always depend on - in the United States and around the world Products