Nanya Technology is trading at TWD 519.00, up 4.43%, as tight DDR4 supply supports its pricing outlook. - AI-related demand is encouraging manufacturers to shift capacity toward higher-end memory, limiting DDR4 availability. - The rally also follows record August revenue and expectations for further DDR4 price increases; these are broader industry developments. - The move appears primarily sector-driven, with no new company-specific announcement identified for September 23, 2026.