Spire Inc. operates as a public utility holding company, which provides natural gas service through its utility operations while engaging in non-regulated activities. The company is headquartered in St. Louis, Missouri and currently employs 3,584 full-time employees. The firm's Gas Utility segment includes the regulated operations of Spire Missouri, Spire Alabama, Spire Gulf Inc. (Spire Gulf) and Spire Mississippi Inc. (Spire Mississippi). Spire Missouri is engaged in the purchase, retail distribution and sale of natural gas. Spire Alabama is engaged in the purchase, retail distribution and sale of natural gas principally in central and northern Alabama. Spire Gulf and Spire Mississippi are utilities engaged in the purchase, retail distribution and sale of natural gas in the Mobile, Alabama area and south-central Mississippi. Its Gas Marketing segment includes Spire Marketing Inc. (Spire Marketing), a wholly owned subsidiary providing natural gas marketing services. The firm's natural gas-related businesses include Spire Marketing, Spire STL Pipeline and Spire Storage.