1. Huawei Semiconductor Technologies Co., Ltd: Specializes in designing and manufacturing semiconductor solutions, including Bluetooth chips for various applications.
2. Wuji Technology: Known for its involvement in semiconductor manufacturing and Bluetooth technology integration.
3. Broadcom (China): Although primarily a US-based company, Broadcom has significant operations in China focusing on wireless communication technologies, including Bluetooth.
4. MediaTek Inc.: A Taiwanese company with a strong presence globally in semiconductors, particularly in Bluetooth solutions used by many Chinese manufacturers.
5. Xiaomi Corporation: While more known for consumer electronics, Xiaomi invests in custom semiconductor solutions that may include Bluetooth technology.

Note: This list includes both domestically focused Chinese companies and international companies with significant operations in China related to Bluetooth chip manufacturing.