United Microelectronics Corporation is an independent semiconductor foundry that manufactures wafers for other companies. The company produces integrated circuits to the design specifications of its customers using proprietary process technologies. Its primary business is wafer fabrication for fabless design companies and integrated device manufacturers across industries such as communication, consumer electronics, and computing.

United Microelectronics Corporation generates revenue primarily through the sale of wafers produced at its manufacturing facilities. The company offers turnkey solutions including wafer fabrication, assembly, and test services to accommodate diverse customer needs. Its main customer base consists of fabless design companies and integrated device manufacturers, with top ten customers accounting for 57.0% of operating revenues in 2025.

The company operates through the following segments:

• Wafer Fabrication: This segment provides semiconductor manufacturing services using advanced process technologies to produce wafers for customer designs. It includes activities such as circuit design support, mask tooling, wafer fabrication, assembly, and testing. The segment utilizes technologies ranging from 6-inch to 12-inch wafer production across multiple fabrication facilities.

• Design and IP Support: This segment offers customer design development services and intellectual property support to facilitate integrated circuit development. It provides access to electronic design analysis tools, design libraries, and silicon-verified IP building blocks. The segment includes the Silicon Shuttle program for early IP verification and collaboration with IP vendors to deliver user-friendly design solutions.

• Turnkey Assembly and Test Services: This segment provides outsourced assembly and test services through partnerships with leading providers such as Siliconware Precision Industries Co., Ltd. and Advanced Semiconductor Engineering Inc. It enables customers to purchase finished semiconductor products after final testing. The segment supports turnkey solutions by managing the post-fabrication steps to deliver working semiconductor devices.

United Microelectronics Corporation holds a leading position as one of the world’s largest independent semiconductor foundries, competing with companies such as Taiwan Semiconductor Manufacturing Company and GlobalFoundries. Its competitive advantages include advanced process technologies, high-volume manufacturing capacity, and a customer-driven partnership model. The company’s technology leadership in nodes such as 28nm, 22nm, and 14nm FinFET enables it to attract premier customers seeking performance, power efficiency, and time-to-market benefits.

United Microelectronics Corporation serves a diversified customer base including fabless design companies and integrated device manufacturers. Specific premier customers include Texas Instruments, Intel, MediaTek, Realtek, and Novatek. The company’s customers operate across industries such as communication devices, consumer electronics, computers, networking, telecommunications, internet, multimedia, PCs, and graphics applications.