Arq, Inc. ARQ

What this company does

Arq, Inc. is an environmental technology company principally engaged in the sale of consumable air, water and soil treatment solutions, primarily based on activated carbon. It manufactures and sells activated carbon and other chemicals used to capture and remove impurities, contaminants and pollutants for the coal-fired power generation, industrial, water treatment, and water and soil remediation markets, which it collectively refers to as the advanced purification technologies market. It owns the Five Forks Mine, a lignite coal mine that currently supplies the primary raw material for the manufacturing of the majority of its products. As of December 31, 2025, the company employed 202 people, of which 201 were full-time, across four facilities. Revenue from its top three customers comprised approximately 42% of its revenue for the year ended December 31, 2025. Arq's predecessor, ADA-ES, Inc., a Colorado corporation, was incorporated in 1997. In February 2023, the company acquired the subsidiaries of Arq Limited, an environmental technology company incorporated under the laws of Jersey, to secure access to additional U.S. based bituminous coal feedstock and a manufacturing facility located in Corbin, Kentucky. In February 2024, as part of a larger rebranding, the Company changed its name to Arq, Inc.

Written from the business description in Arq, Inc.'s annual report to the U.S. Securities and Exchange Commission, filed 10 March 2026. Every sentence was checked against that document before publication.