Arq just printed its ninth consecutive quarter of positive Adjusted EBITDA on the back of a powdered activated carbon (PAC) business that is generating cash, expanding margin, and riding stronger-than-usual coal-fired power demand. Revenue of $29.9 million rose 5% year-over-year, gross margin reached 38.5% - up 520 basis points - and Adjusted EBITDA of $5.8 million climbed 59% from the prior-year quarter. The PAC story is the easy read. The harder read sits in the rest of the quarter. Arq paused production at its granular activated carbon (GAC) facility in March, will not produce any GAC in fiscal 2026 or 2027, is reorganizing the executive suite for the second time in a year, and exited the quarter with $0.9 million of unrestricted cash against $30.7 million of total debt, $22.5 million of which is classified as current. The company is profitable on the metric it controls and stretched on the metric it doesn't.
The market has priced the GAC uncertainty. The stock closed at $2.28 on August 13, off roughly 70% from its 52-week high of $7.72 set in August 2025 - the month management first announced commercial GAC production - and not far above the $1.64 low set in March 2026, the same month the GAC pause was disclosed. The company is now worth about $98 million in equity value against $168 million of stockholders' equity and roughly $128 million of enterprise value. On the midpoint of 2026 revenue guidance, the equity trades at 0.8x and the enterprise at 1.0x; on the midpoint of 2026 Adjusted EBITDA guidance, the equity trades at 5.3x and the enterprise at 6.9x. That is the price of an asset whose optionality has been removed. Management kept the full-year 2026 outlook unchanged at $120–$125 million of revenue and $17–$20 million of Adjusted EBITDA, a guide that - at the midpoint - would have Arq producing a $19 million Adjusted EBITDA print on roughly $123 million of revenue, equivalent to a 15% Adjusted EBITDA margin. The market, at the equity multiples described, is pricing the guide at a discount that says one of three things: GAC is not coming back on the timeline management describes, PAC growth is not durable, or the balance sheet runs out before the PAC story is fully reflected in the print. Each of those can be falsified. The next two quarters do the falsifying.