US Lime & Minerals mines limestone and processes it into lime and limestone products for industrial customers across the south-central U.S. The company operates quarries and underground mines in Texas, Arkansas, Oklahoma, and Missouri, selling products within roughly a 400-mile radius of each plant. Its product range spans crushed limestone used as construction aggregate, pulverized limestone used in roofing and agriculture, quicklime used in steel production and flue gas treatment, and hydrated lime and lime slurry used in water treatment and soil stabilization. The company sells directly to roughly 675 customers across construction, industrial, environmental, metals, agriculture, and oil and gas markets, with no single customer exceeding 10% of sales. The business model centers on mining limestone at low cost and either selling it as-is or processing it into higher-value lime products with better margins. Profitability is sensitive to shipment volumes, since fixed costs are spread across fewer tons at lower volumes, and the business is seasonal with peak activity in Q2 and Q3 driven by construction. Key cost drivers include fuel for kiln operations and transportation. US Lime & Minerals continuously invests in capacity and modernization, including a new vertical kiln at its Texas plant estimated at ~$65M. The company also holds a minor, non-core oil and gas royalty interest in the Barnett Shale.