Arq Inc (Arq) is an environmental technology company primarily involved in the sale of consumable air, water, and soil treatment solutions, including activated carbon (AC) and chemical technologies. The company's proprietary AC products help customers reduce contaminants such as mercury, per- and polyfluoroalkyl substances (PFAS), and other pollutants. Arq serves the coal-fired power generation, industrial, municipal water and air, water and soil treatment, and remediation markets, collectively known as the advanced purification technologies (APT) market.

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Arq has been actively involved in research and development (R&D) activities to enhance its consumables. It focuses on the expansion of potential product offerings within the emissions reduction consumables market to complement the existing chemical solutions. In FY2024, the company incurred R&D costs of US$4.1 million, which increased by 24.2% YoY. As of December 31, 2024, Arq held 84 US patents and 10 international patents, with 15 additional US provisional patents or applications pending, and 36 international patent applications either pending or filed. During FY2024, the company was granted 3 new patents.