Prior to TGM forming in 2006, Effingham-Clay Service Company owned 16 established elevators in Effingham, Neoga, Toledo, Louisville, Watson, Sandoval, Greenup, Middlesworth, Shelbyville, Charleston, Fairgrange, Humboldt, Jewett, Kansas, and Ashmore. In 2006, TGM was formed and the company purchased Huisinga Grain in Casey and Willow Hill Grain Company’s 5 elevators in Ingraham, Lis, Newton, Rose Hill, and Willow Hill.
In 2009, TGM purchased the Windsor and Gays facilities. The following year, South Central FS Inc. merged their grain assets of 5 elevators in Greenville, Keyesport, Mulberry Grove, Hookdale, and Hagarstown with TGM. Also, Chrisman and Metcalf were purchased in 2010 and are currently used as storage facilities. In 2013, TGM purchased Moomaw Grain in Stewardson and in 2015, Sigel Grain.