AdvanSix Inc. is an integrated manufacturer of polymer resins, chemical intermediates, and fertilizers, operating primarily in the United States. The company is a leading North American producer of Nylon 6, a synthetic material used in engineered plastics, fibers, and packaging films. Spun off from Honeywell in 2016, AdvanSix is distinctive for its vertically integrated manufacturing process that captures margin across multiple stages of chemical production.
AdvanSix serves approximately 375 customers annually, primarily in the United States. In 2025 its 10 largest customers accounted for approximately 40% of total sales (38% in 2024 and 39% in 2023). Its largest customer is Shaw Industries Group Inc. ("Shaw"), one of the world's largest consumers of caprolactam and Nylon 6 resin, to which it sells under a long-term agreement; sales to Shaw were 10% of total sales for 2025 and 2024 and 11% for 2023. The company reports an average customer relationship of approximately 20 years.