Photoresist Supporting Reagents segmentation by type categorises the market into four functional groups: solvents, developers, strippers, and performance additives. Solvents dominate the volume metric, representing roughly 45 % of market size, because they are consumed in every coating cycle and must balance polarity, volatility, and substrate compatibility. Developers account for approximately 30 % of revenue; they are formulated to selectively dissolve exposed resist while preserving unexposed regions, and their market share reflects the proliferation of chemically amplified resists that require precise acid‑catalysed reactions. Strippers contribute about 15 % of sales, tasked with complete removal of residual resist and by‑products; their importance rises in multi‑layer processes where aggressive chemistries are needed without damaging underlying films. The remaining 10 % consists of performance additives such as adhesion promoters, antireflective coatings and surfactants, which fine‑tune film uniformity, reduce footing, and improve critical dimension control. Each type’s proportion directly maps to the process flow intensity, influencing total reagent consumption, pricing elasticity, and the strategic focus of manufacturers on formulation innovation.