Spire Inc. operates as a public utility holding company, which provides natural gas service through its utility operations while engaging in non-regulated activities. It operates through the following business segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment includes the regulated natural gas distribution operations of the company. The Gas Marketing segment focuses on the provision of non-regulated natural gas services throughout the United States. The Midstream segment refers to Spire STL Pipeline and Spire Storage. The company was founded in 1857 and is headquartered in St. Louis, MO.