Company Name: Shanghai FourSemi Semiconductor Co., Ltd.

Date of Prospectus: March 23, 2026

Shanghai FourSemi Semiconductor IPO: Powering China’s Next-Gen Semiconductor Growth

Shanghai FourSemi Semiconductor Co., Ltd. is launching its Hong Kong IPO, offering investors a unique opportunity to participate in the rapid expansion of China’s specialist technology sector. This long-form analysis covers all key details about the offering, company fundamentals, market outlook, risks, and investor considerations as disclosed.

IPO Snapshot

IPO symbol: Not disclosed
Offer Price Range: HK\$40.00 – HK\$50.00 per H Share
Total Offer Size: 12,000,000 H Shares (10.71% of enlarged share capital post-IPO; up to 12.13% if over-allotment is exercised)
Number of Shares Offered: 600,000 H Shares in the Hong Kong Public Offering; 11,400,000 H Shares in the International Offering
Post-IPO Outstanding Shares: Calculated from 12,000,000 H Shares offered, representing 10.71% of total shares; estimated total post-listing shares: ~112,000,000
Offer Period: March 23, 2026 (9:00 a.m.) – March 26, 2026 (12:00 noon)
Listing Date: March 31, 2026 (9:00 a.m.)
Application Platforms: White Form eIPO (www.eipo.com.hk), HKSCC EIPO channel, brokers/custodians
Prospectus access: www.hkexnews.hk and www.foursemi.com

Use of Proceeds: Growth-Focused Capital Allocation

Net proceeds (assuming HK\$40.00/share): HK\$480.3 million
Allocation:

• R&D Expansion & New Center: HK\$240.0 million (50%)
• Acquisitions: HK\$48.0 million (10%)
• Marketing Initiatives: HK\$16.0 million (3.3%)
• Headcount Increase: HK\$128.0 million (26.7%)
• Working Capital & General Purposes: HK\$48.0 million (10%)

Growth strategy: The allocation strongly signals a focus on rapid R&D expansion, market share, and new product development, rather than deleveraging or dividend payouts [[276]].

Placement and Issuance Breakdown

• Hong Kong Public Offering: 600,000 H Shares (subject to clawback up to 2,400,000 shares if oversubscribed)
• International Offering: 11,400,000 H Shares (subject to reallocation and Over-Allotment Option)
• Cornerstone/Anchor Investors: Named Sophisticated Independent Investors participated in pre-IPO rounds (no cornerstone allocation disclosed for IPO)
• Employee Allocation: Not specifically disclosed for IPO
• Pre-IPO Investors: Special rights terminated before IPO; lock-up period of 12 months applies [[129]] [[120]] [[122]].

Investor Participation and Book Quality

Anchor/Sophisticated Investors:

• Seven Sophisticated Independent Investors participated in pre-IPO rounds, four holding more than 3% each immediately before IPO [[122]].
• Principal Pre-IPO Investors include Huzhou Zhuosheng, Pathfinder SIIs, and others [[122]].

Pre-listing Disposals: No pre-listing disposals or sales by investors disclosed.
Oversubscription Metrics: Clawback mechanism in place; if public offer is 10x or more oversubscribed, allocation increases to 1,200,000 (10%), and to 2,400,000 (20%) if 50x or more [[291]].
Book Quality Implication: The presence of sophisticated pre-IPO investors and a clawback mechanism imply strong institutional interest and potential for robust first-day trading.

Deal Parties and Structure

Investment Banks, Sponsors, Bookrunners, Underwriters:

• Joint Sponsors: Guotai Junan Capital Limited, Orient Capital (Hong Kong) Limited
• Joint Sponsor-OCs: Guotai Junan Securities (Hong Kong) Limited, Orient Securities (Hong Kong) Limited
• Reporting Accountants: Ernst & Young
• Compliance Advisor: Orient Capital (Hong Kong) Limited
• Underwriting: Fully underwritten; Hong Kong Underwriters and International Underwriters named [[81]] [[35]]

Stabilization/Greenshoe: Over-allotment Option available; stabilization measures outlined [[288]].
Listing-Day Support: The caliber of sponsors and full underwriting suggest a well-supported deal structure, inferring potential for orderly listing-day performance.

Company Overview: Business Model and Market Position

Business Model: FourSemi specializes in the design and development of semiconductor chips, focusing on power amplifier audio chips and haptic drivers. Sales are transaction-based, targeting original equipment manufacturers and consumer electronics companies [[10]] [[25]].
Key Products:

• Power amplifier audio chips (mid/high-power, low-power)
• Haptic drivers

Monetization: Revenue derived from sales of chips to Chinese and international clients.
Customer Segments: OEMs, consumer electronics manufacturers; expanding customer base over recent years.
Geographies: Primary operations in China, with growing international market shares.
Industry/Sector Definition: Semiconductors; “Advanced hardware and software—Semiconductors” sector under Chapter 18C of HKEX Listing Rules [[25]].
Industry Size: Market share of power amplifier audio chips: 4.1% globally in 2024, up from 1.7% in 2021 [[120]].
Competitive Advantages: Launch of China’s first mid/high-power audio chip, rapid sales growth, and expansion of product portfolio [[120]].
Brand Strength: Registered trademarks and patents; expanding customer coverage [[426]].

Financial Health: Key Metrics and Trends

Multi-Period Financials:

Cash Flow: Net cash used in operating activities: RMB -105.8m (2022); RMB -88.6m (2023); RMB -82.7m (2024); RMB -57.3m (2025) [[245]].
Debt Levels: Gearing ratio increased from 11.8% (2022) to 120.1% (2025), reflecting increased leverage [[24]] [[253]].
Profitability: Company has incurred net losses since inception and expects to continue net losses in the near term [[10]].
Working Capital: Sufficient to support operations until April 2028; no immediate plans for further financing [[24]] [[245]].

Market Position and Competitive Advantages

Global Market Share: 4.1% in power amplifier audio chips (2024), up from 1.7% (2021)
Revenue Growth: 244.5% increase from 2021 to 2024
Key Innovations: Launch of China’s first mid/high-power audio chip; expanded portfolio [[120]].
Brand and IP: Multiple trademarks and patents registered, demonstrating ongoing innovation [[426]].

Management Team

Key Persons:

• Mr. Xu: Founder, Chairman, Executive Director, President
• Other Directors and Senior Management: Names and roles listed in prospectus [[9]] [[249]]

Relevant Experience: As described, core management has driven R&D and market expansion [[120]].

Industry Trends, Timing, and Environment

Sector Trends: Rapid growth in semiconductor demand, especially for power amplifier chips and haptic drivers.
Historical Demand Drivers: Increased mobile device adoption, consumer electronics proliferation, and OEM demand.
Timing of IPO: Offer opens March 23, 2026; closes March 26, 2026; listing March 31, 2026.
Macro Environment: China’s technology sector is highlighted as growth-driven, but the IPO prospectus cautions on volatility and valuation risks for specialist technology companies [[2]].
Recent Developments: Notable revenue growth, expanded market share, successful product launches [[120]].
Market Conditions: Based on revenue growth, market share gains, and strong institutional backing, conditions appear favorable for the IPO.

Prospectus Deep Dive: Key Risk Factors

Risks and Quantified Exposure:

• Net Losses: Company has incurred losses since inception; expects short-term losses post-IPO [[49]]
• Revenue Requirement: Only met listing revenue requirement in 2024 after rapid growth [[49]]
• Share Price Volatility: Specialist technology company risk of volatile trading and inflated valuations [[2]]
• Redemption Rights: Formerly granted to pre-IPO investors, now terminated [[120]] [[370]]
• Regulatory/Legal Risks: Operating in China; regulatory changes could impact business [[49]]
• Related Party Transactions: Directors state all are at arm’s length [[253]]
• Customer/Supplier Concentration: Not specifically disclosed as a risk
• Dividend Policy: No dividends declared or paid; none expected in foreseeable future [[10]]
• IPO Dilution: Offer price higher than net tangible asset value per share; immediate dilution for new investors [[73]]

Growth Strategy: Expansion, New Products, and M&A

R&D Expansion: Establishment of new R&D center; HK\$240 million earmarked for this purpose [[276]].
Acquisitions: HK\$48 million allocated for potential acquisitions.
Headcount Increase: HK\$128 million for hiring sales and marketing personnel; aims to enhance client coverage and after-sales support.
Marketing Initiatives: HK\$16 million for brand promotion, exhibitions, and forums.
Working Capital: HK\$48 million for general purposes.
Timeline: Working capital sufficient until April 2028; no immediate additional fundraise planned [[24]] [[245]].

Ownership and Lock-Ups

Pre-IPO Shareholding: Major shareholders include Mr. Xu (Founder), Shanghai FourSemi Management, Xiamen FourSemi Management, Xiamen FourSemi Chuangke, Mr. Liu, and others [[432]].
Post-IPO Shareholding: Estimated based on 12,000,000 H Shares offered; exact percentages for each not disclosed.
Lock-Up Period: All existing shareholders, including pre-IPO investors, are prohibited from disposing of shares for 12 months post-listing [[129]].
ESOPs: Not specified for IPO.

Valuation and Peer Comparison

Valuation: Offer price range HK\$40.00–HK\$50.00 per H Share; market capitalization at listing expected to exceed HK\$4 billion [[25]] [[82]].
Peer Comparison: No direct comparable metrics or peer symbols disclosed; no P/E, P/B, EV/EBITDA, or sector IPO performance tables included in prospectus.

Research and Opinions

Analysts/Covering Institutions: Frost & Sullivan commissioned for independent industry research; no explicit price targets or analyst opinions disclosed [[92]].
Bookrunners/Deal Parties: Guotai Junan Capital Limited, Orient Capital (Hong Kong) Limited, and others provide deep institutional support.

IPO Allotment Result

Final Subscription Outcomes: Results to be published at www.hkexnews.hk and www.foursemi.com no later than 11:00 p.m. March 30, 2026 [[5]].
Implications: If oversubscribed, public allocation increases and indicates strong retail/institutional demand.

Listing Outlook

Subscription Worthiness: Based on robust revenue growth, market share gains, anchor investor backing, and a growth-driven use of proceeds, the IPO appears attractive for investors seeking exposure to China’s semiconductor sector.
First-Day Trading Range Estimate: Based on prospectus disclosures, strong demand is anticipated; trading is likely to be at or above the mid-point of the offer range (HK\$40.00–HK\$50.00), given institutional support, clawback provisions, and sector momentum.
Relative Strength: Expectation of solid first-day performance relative to offer price, inferred solely from prospectus content and deal structure.

Prospectus Access

Prospectus is available at: www.hkexnews.hk and www.foursemi.com

How to Apply

Application Channels:

• White Form eIPO service: www.eipo.com.hk
• HKSCC EIPO channel via brokers/custodians
• Application window: March 23, 2026 (9:00 a.m.) to March 26, 2026 (12:00 noon)

Eligibility: Applicants must be 18 or older with a Hong Kong address; cannot be existing shareholders, directors, supervisors, or their close associates [[298]].