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ChipMOS Technologies
Founded in 1997 by Shih-Jye Cheng in the Hsinchu Science Park, ChipMOS Technologies established itself as a dedicated outsourced semiconductor assembly...
ChipMOS Technologies
Founded in 1997 by Shih-Jye Cheng in the Hsinchu Science Park, ChipMOS Technologies established itself as a dedicated outsourced semiconductor assembly and test services (OSAT) provider. The firm emerged alongside Taiwan's broader chip ecosystem, offering back-end packaging and testing that early fabless memory and LCD driver IC companies needed. Cheng has guided the firm from a local operation into a publicly listed entity with fabrication and service centers in Hsinchu, Tainan, and Shanghai. ChipMOS concentrates on semiconductor assembly, testing, and bumping services across memory, mixed-signal, and LCD display driver segments. The firm's core offering spans wafer probing, package assembly, and final testing. It maintains long-standing relationships with major memory producers and panel driver IC firms. Notable product lines include DDR memory ICs, NAND flash, and thin small-outline packages for mobile displays. ChipMOS operates across Taiwan's Hsinchu and Tainan Science Parks, plus a mainland China footprint through its Unimos Microelectronics subsidiary in Shanghai, serving both domestic Chinese and global semiconductor supply chains. ChipMOS employs thousands across its Taiwan and mainland China facilities, with reported consolidation with affiliate ChipMOS USA Inc. and its Shanghai subsidiary. In November 2023, the firm announced its board approved a USD 120 million investment plan for capacity expansion across its Taiwan facilities (per the firm, November 2023). Its Taiwan Stock Exchange listing (ticker: 8150) and previous NASDAQ presence structured the entity for institutional capital markets access distinct from the typical OSAT. ChipMOS operates under a holding structure that separates its Taiwan and Shanghai businesses while retaining integrated client delivery. This dual-geography model lets it serve both Chinese domestic chip designers onshore and global customers from Taiwan's science parks — a regulatory and logistics differentiator that pure-play Chinese or pure-play Taiwanese AT houses cannot replicate without joint ventures.
General information
Firm type
Asset Manager
Year founded
1997
AUM
Undisclosed
Location
Region
Asia
Country
Taiwan
City
Hsinchu
Corporate office
Hsinchu Science Park, Hsinchu, Taiwan
Additional offices
Shanghai, China · Tainan, Taiwan
Principals
Shih-Jye Cheng
Chairman & CEO
Sector focus
Frequently asked questions
What specific semiconductor functions does ChipMOS perform in the supply chain?
ChipMOS provides back-end outsourced semiconductor assembly and test (OSAT) services, including wafer probing, IC packaging, and final testing. The firm specializes in memory semiconductors (DRAM, NAND flash), liquid-crystal display (LCD) driver ICs, and mixed-signal devices. Its packaging capabilities include thin small-outline packages (TSOP), ball-grid arrays, and gold-bumping technologies used to connect driver ICs to display panels.
How is ChipMOS's China business structured relative to its Taiwan operations?
ChipMOS runs its mainland China business through Unimos Microelectronics, a Shanghai-based subsidiary that handles assembly and testing in the Chinese market. This structure allows Chinese fabless firms to use local services while ChipMOS continues to serve global clients from Taiwan's Hsinchu and Tainan science parks. The firm publicly reports consolidated financials through ChipMOS Technologies Inc., its Taiwan-listed parent.
Is ChipMOS purely an OSAT, or does it also invest in other semiconductor assets?
ChipMOS functions as a dedicated OSAT and holding entity for its operating subsidiaries; there is no public record of the firm operating a venture arm, fund, or external investment vehicle. The firm deploys its own capital into production capacity and equipment rather than third-party fund commitments. Its 2023 USD 120 million capex plan was directed entirely at internal manufacturing expansion.
What is ChipMOS's relationship with memory foundries or integrated device manufacturers (IDMs)?
As an independent OSAT, ChipMOS sits downstream from memory foundries and IDMs such as Micron Technology and Nanya Technology, handling packaging and testing that firms may not perform in-house. Long-term supply agreements tie ChipMOS to large memory producers, although the firm typically does not name specific customers in its public filings. This outsourcing model is standard in the memory semiconductor chain.
Has ChipMOS spun out, merged, or created adjacent operating entities?
The firm consolidated its operations through a historical merger with ThaiLin Semiconductor and has maintained its Shanghai subsidiary Unimos as a distinct onshore China entity. ChipMOS USA Inc. serves as a holding vehicle, though the main Taiwan Stock Exchange entity remains the primary operating and reporting unit. No independent venture studio, philanthropic foundation, or advisory entity is publicly associated with the firm.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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