Exhibit 99.1 Arq Reports Third Quarter 2025 Results Generated revenue of $35 million, driven by strong performance of the foundational PAC business Reported Adjusted EBITDA of$5.2 million, achieving sixth consecutive quarter of positive Adjusted EBITDA Achieved 7% price increase year-over-year Achieved initial commercial phase GAC production and sales GREENWOOD VILLAGE, Colo., November 5, 2025 - GlobeNewswire - Arq, Inc. (NASDAQ: ARQ) (the "Company" or "Arq"), a producer of activated carbon and other envir ...