Shanghai FourSemi Semiconductor Co Ltd (Ticker: 3625 HK) is a China-domiciled fabless semiconductor company specializing in the design of power amplifier audio chips and haptic drivers. The company's products are used to optimize audio quality and provide tactile feedback in consumer electronics and intelligent vehicles. According to Frost & Sullivan, FourSemi ranked fourth globally among power amplifier audio chip providers by revenue in 2024. The company plans to list on the Main Board of the Hong Kong Stock Exchange on March 31, 2026.

The company is offering 12.00 million H shares at an expected price range of HKD 40.00 to HKD 50.00, aiming to raise approximately HKD 600.00 million (equivalent to USD 76.59 million). Based on this price range, the company’s estimated market capitalization is between USD 572 million and USD 715 million. According to the prospectus, the proceeds will be used for research and development, enhancing production capacity, brand promotion, business development, working capital, and strategic acquisitions. The offering is sponsored by Orient Capital and Guotai Junan Capital, with an underwriting syndicate including ABCI Capital, CCB International, and Futu Securities. Led by founder Xu Xiaolin, the company reportedly introduced China's first automotive-grade AEC-Q100-certified power amplifier audio chip in 2023.