AEACTS OF EVOLUTION

COMPANIES · CHIP MFG & PACKAGING

JCET

JCET is mainland China's largest outsourced chip packaging and test company: it packages, assembles and tests chips for chip designers and manufacturers at eight factories in China, South Korea and Singapore.

EnablerChip mfg & packaging

C168 · Public · SSE: 600584 · Profile evidence reviewed

What it does

JCET is mainland China's largest outsourced chip packaging and test company: it packages, assembles and tests chips for chip designers and manufacturers at eight factories in China, South Korea and Singapore.

Why it matters

Advanced packaging is a bottleneck for AI hardware, and JCET is China's main domestic provider; it reported first-half 2026 computing-electronics revenue up 40% and a RMB 7.8 billion investment in a new Shanghai advanced packaging facility, while its CEO said it is capitalizing on opportunities across the AI value chain.

How it makes money

Chip companies pay JCET for packaging design, wafer probing, assembly and test services.

Geography

China (Jiangyin, Jiangsu)

AI stack position

Chip manufacturing, memory and packaging. The foundries, memory makers, and packaging and testing businesses that physically manufacture AI chips. This is where a chip design actually becomes a real, physical piece of silicon.

Competitors
ASE Technology

Connections (3)

Every connection below is tied to a readable source, date, classification and statement of its limits. A company source establishes what that company stated; it does not necessarily provide independent confirmation.

Current relationships (2)

JCET runs Sandisk's Shanghai assembly and test venture for Sandisk
Manufactures forCurrent
Sandisk's registration statement says its assembly and test operations include the Shanghai facility owned and operated by the SDSS Venture, which is 80% owned by JCET and 20% owned by Sandisk.

Source: 2025-06-04 · reviewed 2026-09-26

Evidence: Primary-source statement · Reported operating

Limits: Establishes the venture's ownership and role as of the June 2025 filing; does not disclose volumes, pricing, or Sandisk's share of output from the facility.

Sandisk Corporation Form S-1/A ↗
JCET bought 80% of a Shanghai flash assembly plant from WD (Western Digital)
Buys fromCurrent
The South China Morning Post reported that JCET completed its US$624 million purchase of an 80% stake in SanDisk Semiconductor (Shanghai), a Western Digital subsidiary, in September 2024.

Source: 2024-10-03 · reviewed 2026-09-26

Evidence: Secondary reporting (unconfirmed by primary parties) · Completed transaction (September 2024)

Limits: Covers one plant, not Western Digital itself; Western Digital's flash business was later separated into Sandisk, and the report does not establish plant output or profitability.

China chip-packaging giant JCET takes over Shanghai plant of US flash memory maker SanDisk ↗

Comparisons (1)

JCET competes with ASE Technology
Competes withComparison only
TrendForce's 2024 ranking of outsourced assembly and test providers placed ASE first (about $18.5 billion revenue) and JCET third (about $5 billion).

Source: 2025-05-13 · reviewed 2026-09-26

Evidence: Analytical comparison · Product/market overlap

Limits: Research-firm ranking of 2024 revenue; does not establish head-to-head customer competition, current shares, or comparable AI packaging capability.

Top 10 OSAT Companies of 2024 Revealed, Says TrendForce ↗
Evidence for this profile

JCET Reports 79.4% YoY Growth in H1 2026 Net Profit Attributable to Shareholders, Accelerates Advanced Packaging Expansion ↗
Reviewed

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Inclusion in this database is not an endorsement of a company or its securities. Nothing here is a recommendation to buy or sell anything, and none of it is individualized investment advice. See the disclosures. Data: AI Map v3.24, released .