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SJ Semi
MEOL foundry which implements front-end wafer manufacturing and quality systems
About SJ Semi
SJ Semi operates as a specialized intermediary and service provider within the secondary market for semiconductor manufacturing equipment and components. The firm, led by CEO Johnny Choi, focuses on sourcing and supplying used semiconductor equipment, providing a cost-effective alternative for its clients compared to purchasing new machinery. This market is substantial, valued at over $4.4 billion in 2025 and projected to grow significantly, driven by high capital costs for new equipment and the need for legacy system support.
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The company's business model is centered on leveraging deep industry expertise to facilitate the buying and selling of pre-owned equipment. This includes skillful handling of the entire process, from disassembly and shipping to packaging and export logistics. By monitoring market trends, SJ Semi provides clients with current information, enabling them to procure equipment at reasonable prices. The firm maintains an inventory of equipment and parts, and its services are designed to support clients in the electronics, automotive, and telecommunications industries who rely on semiconductor devices.
SJ Semi's clientele consists of companies within the semiconductor ecosystem that are looking to manage capital expenditures or source parts for older manufacturing lines. The value proposition lies in providing access to a global market of used equipment with professional handling and market intelligence. The company operates an eBay store and a direct business-to-business service, offering parts and equipment from various manufacturers. Based in Gyeonggi-do, South Korea, SJ Semi positions itself as a trusted partner that grows alongside its clients by navigating the dynamic and advanced semiconductor market.
At a glance
- Founded
- 2014
- Headquarters
- Wuxi, China
- Listing
- IPO 2026
- Sector
- Semiconductors
- Power Law
- Unicorn$1–10B valuation tierThoroughbred$100M+ revenue
Latest news
Press, funding announcements and product moves mentioning SJ Semi.
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Series B and later22 investors entered at this stage
Qualcomm Ventures
China National Integrated Circuit Industry Investment Fund (CICF)- CMCCB Private Equity Investment Management
Huatai Securities- CTCCB Trust
- WFWalden CEL Global Fund
- CCCountry Garden Venture Capital
CITIC Gold Stone Investment
Jadestone Capital- GFGeneral Construction Fund
Oriza Holdings
TCL Capital- LILifeng Investment
Legend Capital
INCE Capital
Shang Qi Capital- SXSMIC Xicheng
- YHYuanhe High Hope
- CIChina Life Private Equity Investment
Shanghai International Group
Golden Link- FCFortera Capital
Source: Dealroom Talent Intelligence.
Global footprint
team presence
across markets
Patents
785 active patent families included in this estimate.
A patent family groups patent filings for the same invention. Source: Dealroom · PatSnap.
Market sentiment
An AI-synthesised read of the highest-engagement posts about SJ Semi on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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