SJSemi

Semiconductors · Wuxi, China · Founded 2014 · IPO 2026

MEOL foundry for wafer-level advanced packaging and 3D multi-die integration MoreLess

SJSemi (盛合晶微 / SJ Semiconductor) is a China-based middle-end-of-line (MEOL) pure-play foundry headquartered in Jiangyin, Wuxi, Jiangsu. Founded in 2014, the company provides 12-inch wafer-level advanced packaging and testing across bumping, RDL, WLCSP, chip probing (CP) and multi-die / chiplet integration for smartphones, 5G, high-performance computing, data centers, automotive and other electronics. Its SmartPoser technology platform targets high-bandwidth, low-power 3D heterogeneous integration used in AI and HPC packages. SJSemi closed a US$700 million financing round in December 2024 with Wuxi and Shanghai state-linked investors and is advancing a STAR Market IPO to expand 3D multi-chip integration capacity. Branches include Shanghai and Silicon Valley. This profile is the Jiangyin advanced-packaging operating company — not a secondary-market used-equipment broker.

Valuation $20B

Revenue $500M–1B

Power Law Unicorn$1–10B valuation tier Thoroughbred$100M+ revenue

Knowledge graph

News Ruihe caps SJ Semiconductor fund deal at $10M with no upfront payment Jul 9, 2026

Talent graph

SJSemi's talent

Book a demo to see the people

Team profiled 1 named & role-tagged

Founders /100 quality score

Key operators 1 quality /100

Potential founders likely future founders

Startup mafia alumni-founded startups

Talent movements in · out past 12 months

Source: Dealroom Talent Intelligence.

Investors

22 investors on SJSemi's cap table

Sourced from Dealroom's funding history. Investor profile links are shown where available.

Series B+ 22 investors entered at this stage

Qualcomm Ventures

China National Integrated Circuit Industry Investment Fund (CICF)

CCB Private Equity Investment Management

Huatai Securities

CCB Trust

Walden CEL Global Fund

Country Garden Venture Capital

CITIC Gold Stone Investment

Jadestone Capital

General Construction Fund

Oriza Holdings

TCL Capital

Lifeng Investment

Legend Capital

INCE Capital

Shang Qi Capital

SMIC Xicheng

Yuanhe High Hope

China Life Private Equity Investment

Shanghai International Group

Golden Link

Fortera Capital

Global footprint

Where SJSemi has talent and traffic

Workforce by country

1 countries with
team presence

🇨🇳 China100%

1 country shown

Web traffic by country

3.1K monthly visits
across markets

🇺🇸 United States71%

🇨🇳 China22.6%

🇭🇰 Hong Kong9.7%

Top 3 markets shown

Patent intelligence

$23M patent portfolio · 785 active families

Estimated portfolio value

$23M

231.1% of market cap · 141.8× larger than top peer Silicon Box ($163k)

785 active patent families

Source: Dealroom Patent Intelligence · Patsnap. Request a demo for the full per-sub-category breakdown, individual records, and quality-score history.

Market sentiment

What the market is saying about SJSemi

An AI-synthesized read of the highest-engagement posts about SJSemi on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

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

See SJSemi on the full Dealroom platform

Live deal flow, founder pedigree, hiring signals, revenue trajectory, and the full cap table.

Book a demo Explore company profiles