Business Description

In this Annual Report on Form 10-K, unless the context otherwise dictates, “AdvanSix,” the “Company,” “we,” “us” or “our” means AdvanSix Inc. and its consolidated subsidiaries. Corporate History On October 1, 2016, Honeywell International Inc. (“Honeywell”) completed the separation of AdvanSix. The separation was completed by Honeywell distributing (the "Distribution") all of the then outstanding shares of common stock of AdvanSix on October 1, 2016 (the “Distribution Date”) through a dividend in kind of AdvanSix common stock, par value $0.01 per share, to holders of Honeywell common stock as of the close of business on the record date of September 16, 2016 who held their shares through the Distribution Date. Description of Business AdvanSix Inc. is an integrated chemistry company that produces essential materials for diverse end markets. Our value chain of our five U.S.-based manufacturing facilities plays a critical role in global supply chains and enables us to innovate and deliver essential products for our customers across building and construction, fertilizers, agrochemicals, plastics, solvents, packaging, paints, coatings, adhesives, electronics and other end markets. Guided by our core values of Safety, Integrity, Accountability and Respect, AdvanSix strives to deliver best-in-class customer experiences and differentiated products in the industries of nylon solutions, plant nutrients and chemical intermediates. Our key product lines are as follows: • Nylon Solutions ◦ Nylon – We sell our Nylon 6 resin globally, primarily under the Aegis® brand name. Nylon 6 is a polymer resin which is a synthetic material used by our customers to produce fibers, filaments, engineered plastics and films that, in turn, are used in such end-products as carpets, automotive and electric components, sports apparel, food packaging and other industrial applications. ◦ Caprolactam – Caprolactam is the key monomer used in the production of Nylon 6 resin. We internally polymerize caprolactam into Aegis® Nylon 6 Resin, and we also market and sell the caprolactam that is not consumed internally to customers who use it to manufacture polymer resins to produce fibers, compounds and other nylon products. Our Hopewell manufacturing facility is one of the world’s largest single-site producers of caprolactam as of December 31, 2025. • Plant Nutrients – Our ammonium sulfate is used by customers as a fertilizer containing nitrogen and sulfur, two key plant nutrients. Ammonium sulfate fertilizer is derived from the integrated operations at the Hopewell manufacturing facility. Because of our Hopewell facility’s size, scale and technology design, we are the world’s largest single-site producer of ammonium sulfate fertilizer as of December 31, 2025. We market and sell ammonium sulfate primarily to North American and South American distributors, farm cooperatives and retailers to fertilize crops. We also manufacture sulfuric acid, ammonia and carbon dioxide as part of our integrated operations at Hopewell and occasionally sell any excess material not consumed internally to customers externally. • Chemical Intermediates – We manufacture, market and sell a number of chemical intermediate products that are derived from the manufacturing processes within our integrated supply chain. Most significant is acetone which is used by our customers in the production of solvents, paints, coatings, adhesives, resins and herbicides. Other intermediate chemicals that we manufacture, market and sell include phenol, alpha-methylstyrene ("AMS"), cyclohexanone, oximes, cyclohexanol, and alkyl-amines and specialty amines. Additional end-products for intermediates include automotive components, and water treatment and pharmaceutical intermediates. Each of these product lines represented the following approximate percentage of total sales: Years Ended December 31, 2025 2024 2023 Nylon 20% 23% 23% Caprolactam 18% 18% 20% Plant Nutrients* 37% 30% 31% Chemical Intermediates* 25% 29% 26% 100% 100% 100% 1 * In 2024, the Company transferred certain products between its Chemical Intermediates product line and its Plant Nutrients product line to align more closely with its current sales structure. Historical information was reclassified to reflect these changes for all periods presented in the Consolidated Financial Statements. Total revenue amounts were not impacted for either period.…