Aromatic hydrocarbon resins derived from C5 and C9 feedstocks are thermoplastic polymers widely used as tackifiers and modifiers in coatings, adhesives, and inks. Their low‑viscosity, excellent compatibility, and high‑performance attributes make them indispensable for automotive, packaging, and construction applications. The C5 and C9 Aromatic Hydrocarbon Resin market size reached approximately USD 2.55 billion in 2025, and the market forecast projects a compound annual growth rate (CAGR) of ~5% from 2026 to 2033, driven by expanding demand for high‑performance coatings, stringent VOC regulations, and a shift toward sustainable, bio‑based resin formulations. Key forces shaping the industry include rapid technology adoption for low‑emission resin grades, tighter environmental standards across major economies, and intensified competitive dynamics as leading players consolidate to secure feedstock access. Asia‑Pacific commands the largest market share, while Southeast Asia emerges as the fastest‑growing region, reflecting robust industrialization and rising consumption of coated products.