Financial Services for Personal and Business Planning Headquartered in Bethesda, Maryland, First Financial Group is a complete financial services firm – one of the largest independently owned businesses of its kind in the Mid-Atlantic region. The firm employs over 200 representatives and licensed brokers. Securities and investment advisory services offered through qualified registered representatives of MML Investors Services, LLC, Member SIPC. Supervisory Office: 7101 Wisconsin Avenue, Suite 1200, Bethesda, MD 20814; Phone: 301-907-9030. Local firms are sales offices of Massachusetts Mutual Life Insurance Company (MassMutual), Springfield, MA 01111-0001 and are not subsidiaries of MassMutual or its affiliated companies.