SII Investments, also known as SII, offers a range of financial services. Founded in 1968, it is a full-service, independent broker and dealer. The company maintains an investment advisory department, as well as provides consulting and asset management solutions. SII Investments offers online retirement planning, life insurance and investment calculators. It is a member of the Financial Industry Regulatory Authority and Securities Investor Protection Corporation. The company is a subsidiary of National Planning Holdings, which is one of the largest independent broker and dealer networks in the United States.