SJ Semiconductor (SJSemi, 盛合晶微) is a Chinese middle-end-of-line pure-play foundry providing 12-inch wafer-level advanced packaging and test services. Founded in Jiangyin, Jiangsu in August 2014 as a SMIC-JCET joint venture, it began with wafer bumping and redistribution-layer processing and now mass-produces 2.5D and 3D multi-die (chiplet) integration for smartphones, 5G, HPC, data centres and automotive. It leads mainland China in 12-inch bumping, 12-inch WLCSP and wafer test revenue. SMIC and JCET exited in 2021; China's 'Big Fund' is a major shareholder. Added to the U.S. Entity List in 2020. Listed on Shanghai's STAR Market (688820) on 21 April 2026.
SJSemi is publicly traded
This company is no longer available on our private secondary market. Shares can be traded publicly under its listed ticker.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2014
Total Funding
$1.34B
3 rounds
Last Private Valuation
$2B
Listed on Shanghai STAR Market (688820), raising ~RMB4.8B in IPO; shares surged on debut
IPO converts pre-listing equity into tradable public shares, a liquidity event for prior holders
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Total raised $1.34B across 3 rounds
Last updated 08-29-2026
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| Dec 31, 2024 | Late-stage / Strategic financing Press release | $700M | — | Not disclosed |
| Apr 10, 2023 | Series C+ Press release | $340M | — | Not disclosed (multi-investor consortium) |
| Oct 8, 2021 | Series C | $300M | — | Not disclosed |
Cui Dong
Chairman & Chief Executive Officer
SJSemi listed on the Shanghai Stock Exchange's STAR Market on 21 April 2026 under ticker 688820, pricing 255.466M shares at RMB19.68 for gross proceeds of RMB5.028B (RMB4.778B net) — the largest A-share IPO of 2026 to date and, as a Cayman-incorporated red-chip issuer, a structural milestone for that class of company on the A-share market. Proceeds are earmarked entirely for chiplet-based multi-die integration capacity, principally 3D multi-die and ultra-high-density interconnect packaging projects. Shares traded far above the offer price in the debut week, valuing the company at roughly RMB140B.
SJSemi shares can be purchased through any standard brokerage account — including Fidelity, Charles Schwab, TD Ameritrade, and online platforms like Robinhood or E*TRADE. Search for the ticker to place an order.
SJSemi had a valuation of approximately $2B at the time of its public offering. Current market capitalization fluctuates with the share price.
SJSemi raised $1.34B across 3 disclosed funding rounds prior to its public listing.
SJSemi is headquartered in Jiangyin, Jiangsu, China.
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