Nationwide Financial | 36,287 followers on LinkedIn. Nationwide, a Fortune 100 company based in Columbus, Ohio, is one of the largest and strongest diversified insurance and financial services organizations in the United States and is rated A+ by both A.M. Best and Standard & Poor’s. Nationwide provides a full range of insurance and financial services products including life insurance, public and private sector retirement plans, annuities, and mutual funds available through Nationwide Financial.