Arq (ARQ) Q2 2026 earnings review
Core PAC Carries the Load While GAC Uncertainty Lingers
Arq delivered a stable Q2, generating $29.9 million in revenue (+5% YoY) and a record 38.5% gross margin despite undergoing a biennial plant turnaround. The foundational Powdered Activated Carbon (PAC) business continues accelerating, driving Adjusted EBITDA up 59% YoY to $5.8 million. However, the company's growth engine—the Granular Activated Carbon (GAC) facility—remains paused. With unrestricted cash dwindling to ~$3 million and total debt rising to $30.7 million, management is pivoting to a new 'PAC for PFAS' product to bridge the revenue gap ahead of 2027 EPA deadlines, while the GAC strategic review remains unresolved.
🐂 Bull Case
Gross margins expanded by 520 basis points YoY to 38.5%, proving that the core PAC business is highly profitable when unburdened by GAC testing and production costs.
The introduction of 'PAC for PFAS' provides a near-term avenue to capture demand driven by upcoming EPA regulations without requiring the heavy capital expenditures of the GAC restart.
🐻 Bear Case
Despite positive EBITDA, unrestricted cash sat at just $3.1 million in July, while total debt climbed to $30.7 million, severely limiting capital flexibility.
The strategic review for the paused GAC facility now estimates a 12-month construction and commissioning timeframe once a plan is finalized, effectively removing GAC as a near-term growth catalyst.
⚖️ Verdict: ⚪
Neutral. The underlying PAC business is genuinely improving and funding the company's survival, but Arq is heavily constrained by its balance sheet and past missteps in the GAC facility design.
Key Themes
Foundational PAC Margins Accelerating
The core PAC business continues its robust turnaround. Stripped of the cash-draining GAC pre-production costs that plagued prior quarters, gross margin surged to 38.5% (up from 33.3% YoY and 34.2% in 26Q1). This was achieved despite a biennial turnaround at the Red River Plant, demonstrating solid underlying pricing discipline and volume demand.
Product Innovation: PAC for PFAS
To capture the macro tailwind of the U.S. EPA's April 2027 PFAS monitoring deadline without a functioning GAC plant, Arq is aggressively advancing 'PAC for PFAS.' This highly engineered powdered carbon targets utilities that are marginally outside the new 4 parts-per-trillion threshold, offering a solution that eliminates the capital cost of installing new GAC equipment. Management expects material volume and margin contributions starting in 2027.
Corbin Wetcake Asphalt Monetization
The pursuit of alternative uses for the Corbin facility feedstock is showing stable progress. Recent trials at the NCAT Test Track indicate that Corbin Wetcake positively impacts multiple asphalt performance metrics. While currently pre-revenue, this represents a crucial potential funding source and non-dilutive monetization pathway.
GAC Restart Timing and Cost Ambiguity
The GAC operational assessment is still incomplete. While management has received estimates from two independent engineering firms to fix the previously identified design flaws, these estimates contain a 'wide range of contingencies' and outline a 12-month construction timeline. The longer this review drags on, the greater the risk that Arq misses the peak demand window ahead of 2027 EPA deadlines.
Critically Low Unrestricted Cash
Management highlights 'the earning power of our foundational PAC business,' but this contradicts the balance sheet reality. While total cash is $12.1 million, $11.2 million of that is restricted. Unrestricted cash was essentially tapped out at quarter-end, recovering slightly to just ~$3.1 million by July 31. Concurrently, total debt rose to $30.7 million, driven by heavy reliance on the $21.4 million revolving credit facility. The company is operating on a razor-thin margin of error.
Leadership Turnover and Severance Costs
SG&A expenses jumped by $0.9 million YoY (to $6.8 million), driven primarily by severance and recruiting costs following a wave of executive departures (including the CFO, COO, and CAO transitions announced in prior quarters). A newly appointed CFO, Shimon Steinmetz, started in July. High leadership turnover during a critical strategic pivot introduces significant execution risk.
Other KPIs
Accelerating sequentially from $2.7 million in 26Q1 and up 59% from $3.7 million in 25Q2. Represents the 9th consecutive quarter of positive Adjusted EBITDA, buoyed by higher pricing and the absence of GAC-related drag.
Decelerating from $1.9 million YoY, reflecting the pause in GAC facility expansion. The company capitalized $3.1 million related to the planned major maintenance (turnaround) during the quarter.
Guidance
Stable. The reaffirmed guidance implies flat-to-minimal growth compared to the $120.3 million achieved in FY25. With $58.9 million generated in H1 2026, the company needs ~$63.6 million in H2 (implied ~8% sequential half-over-half growth) to hit the midpoint.
Accelerating. The midpoint of $18.5 million implies a substantial 40% YoY jump from the $13.2 million recorded in FY25, highlighting the pure profitability of the PAC operations when separated from GAC developmental drag.
Stable. Reaffirmed guidance implies a controlled spending environment focused solely on maintenance and high-ROI operational tweaks rather than major facility overhauls.
Key Questions
GAC Capital Requirements
With the independent engineering estimates now in hand and citing a 12-month build time, what is the preliminary range of capital required to fix the GAC line, and how will it be funded given the $3 million unrestricted cash balance?
PAC for PFAS Margin Profile
How does the anticipated gross margin and average selling price of 'PAC for PFAS' compare to the standard PAC business and the originally modeled GAC business?
Debt Ceiling and Covenant Risk
Total debt is now over $30 million. Are there any near-term covenant concerns on the revolving credit facility, and at what point would an equity raise become unavoidable despite management's aversion to it?