The GMS Group | 952 followers on LinkedIn. Put a Municipal Bond Specialist To Work For You! | THE GMS GROUP – Municipal Bond Specialists Expertise in Tax-Free Municipal Bonds that Spans 35 Years GMS traces its beginnings back to 1979 when we established ourselves as specialists in tax-exempt municipal bonds. Today, GMS still specializes in municipal bonds while providing a full range of investment products and services. These services compliment the fixed-income needs and objectives of High-Net-Worth individuals, corporations, not-for-profit organizations, states, local governments, banks, insurance companies and more.