Arq, Inc. (ARQ:NASDAQ) closed at $1.78 on October 19, 2026, down 0.56% on the day. The stock trades 75.1% below its 52-week high of $7.14 and 15.6% above its 52-week low of $1.54. Over the past year, it lost 74.6%. Arq, Inc. is part of the Basic Industries sector.
In 252 trading sessions since October 17, 2025, ARQ closed higher on 103 days (41%). Its best day was March 12, 2026 (+14.61%) and its worst was March 10, 2026 (-48.75%). The stock moved 10% or more in a single session 5 times. It opened at least 5% above the previous day's high 2 times.
Advanced Emissions Solutions Inc is a holding company that provides emissions solutions to customers in the coal-fired power generation, industrial boiler, and cement industries. The company has two reportable segments namely Refined Coal which provides a reduction of mercury and nitrogen oxide emissions at select coal-fired power generators through the production and sale of Refined Coal; and the APT segment.
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Based on end-of-day data. For information only, not investment advice.