A mission-critical semiconductor “circular economy” leader trading at a deep valuation discount, with upside from AI-driven fab intensity and an embedded China/energy optionality—offset by geopolitics and cyclicality.
Overview
RS Technologies is a Tokyo-based, globally scaled leader in silicon wafer reclamation—refurbishing test/monitor wafers used by foundries and IDMs for equipment calibration, process monitoring, and recipe development. By stripping, grinding, and polishing wafers back to near-virgin surfaces, it enables customers to reuse costly silicon assets multiple times, lowering consumable spend and supporting advanced-node manufacturing where testing intensity is rising. The business spans four segments: (1) Wafer Reclaim (core profit engine; 200mm/300mm), (2) Prime wafer manufacturing/sales in China via majority-owned GRITEK (STAR-listed), (3) semiconductor equipment/materials (consumables and refurbished tools, largely China-oriented), and (4) “Others,” including solar and a developing VRFB electrolyte business. FY2025 delivered record sales of ~76.7B JPY (+29.6% YoY) with operating income ~14.3B JPY (+8.9%), supported by high utilization at Sanbongi (Japan) and Tainan (Taiwan). The company is a leveraged beneficiary of the next semiconductor upcycle tied to AI/5G/EV, though valuation reflects perceived China/geopolitical risk.