Spire Inc. operates as a public utility holding company, which provides natural gas services through its regulated core utility operations while engaging in non-regulated activities. The company is headquartered in St. Louis, Missouri and currently employs 3,475 full-time employees. Spire Missouri is a public utility engaged in the purchase, retail distribution and sale of natural gas. Spire Alabama is a public utility engaged in the purchase, retail distribution and sale of natural gas principally in central and northern Alabama, serving residential, commercial and industrial customers. The firm's segments include Gas Utility, Gas Marketing and Midstream. The Gas Utility segment includes the regulated operations of Spire Missouri, Spire Alabama, Spire Gulf Inc. and Spire Mississippi Inc. The Gas Marketing segment includes Spire Marketing Inc., a wholly owned subsidiary providing natural gas marketing services. The Midstream segment includes Spire STL Pipeline LLC, Spire MoGas Pipeline LLC, and Spire Storage, which are subsidiaries engaged in the transportation and storage of natural gas.