Since 1912,Companion Insurance Agency: A Liberty Mutual Company has been committed to providing broad, useful and competitively-priced insurance products and services that meet our customers ever-changing needs. Our delivery on this commitment is the reason we are 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 U.S. and around the world.