China’s third-largest chip foundry, Nexchip Semiconductor, filed for a Hong Kong listing on Tuesday as domestic wafer fabs race to expand production capacity amid surging artificial intelligence demand and Beijing’s push for greater chip self-sufficiency. Nexchip, a smaller rival to SMIC and Hua Hong Semiconductor, is seeking a dual listing in Shanghai and Hong Kong, signalling the state-backed foundry’s latest effort to strengthen its position in China’s mature-node chipmaking sector. The move...