SUMCO Shares Surge 9.1% as Japanese Tech Rally Boosts Silicon‑Wafer DemandSUMCO’s 9.1% stock jump on Sep 30 shows investors reward its role in the high‑purity silicon wafer supply chain, fueling Tokyo’s tech‑driven rally.SUMCO CORP Information Technology Semiconductors & Semiconductor Equipment AI generated 03/10/2026, 07:31 2 minutes to read