Arq, Inc.: management transactions · United States · SEC (Form 4)

About Arq, Inc.

Arq, Inc. (NASDAQ: ARQ) is a United States–listed environmental technology and carbon-materials company traded on the Nasdaq Global Market. Headquartered in Greenwood Village, Colorado, Arq focuses on consumable air, water, and soil treatment solutions built primarily around activated carbon. The company operates as a vertically integrated North American producer of activated carbon products, with manufacturing, mining, and logistics activities tied to Louisiana and coal-recovery/manufacturing operations in Kentucky. Its core mission is to help customers reduce contaminants such as mercury, PFAS, and other pollutants in response to current and expected environmental regulations. ([sec.gov](https://www.sec.gov/Archives/edgar/data/0001515156/000151515626000021/arq-20251231.htm?utm_source=openai)) Arq’s corporate history is relatively recent in its current form, but it is rooted in a longer transformation. The business was previously known as Advanced Emissions Solutions, Inc. and in 2023 completed the acquisition of Arq Limited, a UK-based environmental technology company founded in 2015 that had developed a novel process for producing specialty carbon products from coal mining waste. In February 2024, the company completed its rebrand to Arq, Inc., and its common stock began trading under the ARQ ticker on Nasdaq. This rebranding marked a strategic pivot toward a more focused environmental-products platform. ([arq.com](https://www.arq.com/history/?utm_source=openai)) From a product perspective, Arq is centered on granular activated carbon (GAC), powdered activated carbon (PAC), colloidal carbon products (CCP), and related additives. GAC is positioned for water treatment applications, PAC serves industrial purification and emissions-control use cases, and the company also markets products for remediation and other environmental applications. Arq emphasizes domestic sourcing and manufacturing, which is important in a market where reliability of supply, regulatory compliance, and technical performance can matter as much as price. The company also highlights a broad intellectual-property base, including a family of more than 190 patents and patent applications. ([arq.com](https://www.arq.com/products/?utm_source=openai)) In competitive terms, Arq is best viewed as a specialized environmental materials supplier rather than a broad chemicals conglomerate. Its competitive positioning depends on product performance, regulatory tailwinds, and the ability to secure long-term customer contracts in water treatment, air emissions control, and soil remediation. Because activated carbon is used in highly regulated end markets, Arq’s business benefits from rising environmental compliance needs, especially around PFAS and other contaminants. At the same time, the company’s niche focus means execution, production efficiency, and customer adoption are central to value creation. ([sec.gov](https://www.sec.gov/Archives/edgar/data/0001515156/000151515626000021/arq-20251231.htm?utm_source=openai)) Recent news is material for investors. In its March 2026 fourth-quarter and full-year 2025 results, Arq reported record full-year revenue of about $120 million, up 10% year over year, and introduced full-year 2026 guidance. Management also announced a pause in GAC production and development while it conducts a comprehensive engineering and production-process optimization review. That combination suggests a company that has achieved meaningful commercial momentum in its PAC business while reassessing the best path forward for its next growth phase. ([arq.com](https://www.arq.com/press-releases/arq-reports-fourth-quarter-and-full-year-2025-results/?utm_source=openai))