ChipMOS TECHNOLOGIES INC. is a leading independent provider of semiconductor assembly and testing services. The company specializes in testing and assembly services for memory, logic/mixed-signal, and display panel driver semiconductors including LCD, OLED, and automotive panel applications. Its operations also include gold bumping and memory module manufacturing. ChipMOS leverages its engineering expertise and geographic presence in Taiwan to serve customers seeking cost-efficient and logistically advantageous solutions near major foundries and consumer electronics producers.

ChipMOS generates revenue through its core assembly and testing services across multiple semiconductor product lines. Revenue is derived from testing services for memory and logic/mixed-signal semiconductors, assembly services for the same product categories, display panel driver semiconductor assembly and testing, and bumping services for semiconductors. In 2025, these segments contributed 23.7%, 28.6%, 24.5%, and 23.2% of total revenue respectively. The company serves a global customer base that includes semiconductor manufacturers and fabless companies requiring outsourced back-end manufacturing support.

The company operates through the following segments: Memory and Logic/Mixed-Signal Semiconductors Testing, Memory and Logic/Mixed-Signal Semiconductors Assembly, Display Panel Driver Semiconductor Assembly and Testing, and Bumping Services.

• Memory and Logic/Mixed-Signal Semiconductors Testing includes engineering test, wafer probing, and final test services for memory and logic/mixed-signal semiconductors such as SRAM, DRAM, and Flash memory. These services utilize parallel testing, wafer level probing, and burn-in testing to ensure product reliability and performance.

• Memory and Logic/Mixed-Signal Semiconductors Assembly involves wafer lapping, die saw, die attach, wire bonding, flip chip bonding, molding, marking, dejunking, trimming, electrical plating, ball mount and reflow, forming/singulation, and final inspection and packing. The company offers leadframe-based and organic substrate-based packages including TSOP, QFN, LQFP, SOP, BGA, FCQFN, and WLCSP formats.

• Display Panel Driver Semiconductor Assembly and Testing provides services for LCD, OLED, automotive panel, and other display panel driver semiconductors using COF and COG technologies. This includes chip probing, wafer lapping, laser marking, inner lead bonding, potting, and final testing, with capabilities for high-frequency testing up to 6.5Gbps and operation in extreme temperatures for automotive applications.

• Bumping Services include gold bumping, silver alloy bumping, copper pillar bumping, and wafer-level chip scale packaging (WLCSP). These services support advanced interconnection technologies for high-performance memory, power management, and automotive applications, with ongoing development of finer pitch and higher reliability bump structures.

ChipMOS holds a leading position as an independent provider of semiconductor assembly and testing services in Taiwan, competing with major players such as Advanced Semiconductor Engineering Inc., Amkor Technology Inc., Chipbond Technology Corporation, King Yuan Electronics Co., Ltd., Powertech Technology Inc., and Jiangsu Changjiang Electronics Technology Co., Ltd. The company differentiates itself through its vertically integrated service model, broad technology portfolio including COF and COG capabilities, high utilization rates, and proximity to key semiconductor supply chains in Taiwan, enabling cost-effective and timely solutions for customers.

ChipMOS serves a diverse customer base including memory, logic/mixed-signal, and display panel semiconductor manufacturers. Specific customers include Asahi Kasei Microdevices Corporation, Chipone Technology (Beijing) Co., Ltd., Elite Semiconductor Microelectronics Technology Inc., GigaDevice Semiconductor (HK) Limited, Himax Technologies Inc., ILI Technology Corporation, Integrated Circuit Solution Inc., Macronix International Co., Ltd., MediaTek Inc., Micron Technology Inc., Nanya Technology Corporation, Novatek Microelectronics Corp., Phison Electronics Corp., Raydium Semiconductor Corporation, and Winbond Electronics Corporation. These customers represent a mix of domestic and international semiconductor companies across various application areas.