Secondary Listing vs Dual Primary Listing: Route Selection for US-Listed Chinese Companies Returning to Hong Kong

The calculus for US-listed Chinese companies weighing a return to Hong Kong has shifted materially in the past 18 months. While the 2020-2023 wave was driven primarily by the spectre of mandatory delisting under the Holding Foreign Companies Accountable Act (HFCAA), the 2025-2026 decision matrix now includes the Hong Kong Stock Exchange’s (HKEX) updated listing regime for specialist technology companies (Chapter 18C, effective 31 March 2023, with further guidance in 2024), the Securities and Futures Commission’s (SFC) tightened rules on connected transactions and notifiable transactions (SFC Code on Takeovers and Mergers, revised 2024), and the practical consequences of the PRC’s revised cross-border data security regulations (Measures for Data Export Security Assessment, effective 1 June 2023, updated 2025). As of Q1 2025, 28 US-listed Chinese companies have completed secondary listings in Hong Kong, while 12 have opted for dual primary listings. The choice between these two routes—secondary listing (SL) under HKEX Chapter 19C or dual primary listing (DPL) under Chapters 7 and 19—carries distinct implications for regulatory compliance, index eligibility, shareholder rights, and future capital-raising flexibility. Understanding the precise mechanics of each route, and how HKEX and the SFC now treat them, is essential for any issuer’s board and sponsor team.

The Core Structural Distinction: Chapter 19C vs. Full Primary Listing

Eligibility Thresholds and Grandfathering Provisions

The most immediate differentiator between a secondary listing and a dual primary listing is the eligibility criteria under HKEX Chapter 19C for SL. An issuer must be a “Grandfathered Greater China Issuer” or a “Non-Greater China Issuer” to qualify for secondary listing. Under Chapter 19C.02, a Grandfathered Greater China Issuer is one that was primary-listed on a Qualifying Exchange (NYSE, Nasdaq, or London Stock Exchange’s Main Market) on or before 15 December 2017. For issuers that listed after that date, a secondary listing is only available if the issuer has a market capitalisation of at least HKD 10 billion at the time of application, or HKD 4 billion with revenue of at least HKD 1 billion for the most recent financial year (Chapter 19C.03). As of March 2025, 18 of the 28 SL issuers were grandfathered, while 10 relied on the market cap/revenue test.

In contrast, a dual primary listing requires the issuer to meet all full Main Board listing requirements under Chapters 7 and 19, including the three-year track record of management continuity, the profit test (HKD 35 million in the most recent year and HKD 45 million aggregate over the prior two years), or the market cap/revenue/cash flow test (HKD 4 billion market cap, HKD 500 million revenue, and positive cash flow of HKD 100 million aggregate). For issuers that are already US-listed, the HKEX will accept their US financial statements under HKFRS or IFRS without restatement, provided the issuer has been audited under PCAOB standards for at least two years (HKEX Listing Decision LD117-2023).

Regulatory Compliance Burden: The SFC’s Watch List

A secondary listing allows the issuer to retain its primary regulatory home—typically the SEC and PCAOB—for most corporate actions, with the HKEX acting as a secondary regulator for Hong Kong-specific matters. The SFC’s Code on Takeovers and Mergers (Takeovers Code) applies to SL issuers only in respect of Hong Kong-registered shares or Hong Kong depositary receipts (HDRs), not to the issuer’s entire share capital. In practice, this means that a mandatory general offer (MGO) under Rule 26 of the Takeovers Code is triggered only if a person acquires 30% or more of the voting rights of the Hong Kong-listed shares, not the company’s total issued shares. This is a critical distinction for controlling shareholders seeking to maintain their position without triggering a full offer.

A dual primary listing, conversely, subjects the issuer to the full Takeovers Code for its entire share capital. Any acquisition of 30% or more of the issuer’s total voting rights—including US-listed shares—triggers an MGO. The SFC’s 2024 revision to the Takeovers Code (effective 1 January 2025) clarified that for DPL issuers, the code applies to all shares, regardless of where they are listed. This has direct implications for shareholder structure: as of Q1 2025, three DPL issuers have had to restructure their shareholding to avoid triggering an MGO, compared to zero SL issuers.

Index Eligibility and Passive Fund Flow Implications

Hang Seng Index and MSCI Treatment

Index eligibility is one of the most consequential operational differences between SL and DPL. The Hang Seng Index (HSI) and Hang Seng Composite Index (HSCI) have historically excluded secondary-listed shares from index inclusion. In a significant policy shift, Hang Seng Indexes Company (HSIC) announced in November 2024 that, effective from the March 2025 quarterly review, secondary-listed shares with a “Greater China” classification would be eligible for HSI inclusion, provided the issuer’s Hong Kong-listed shares represent at least 10% of the total issued shares by value. This change followed sustained lobbying by the Hong Kong Exchanges and Clearing (HKEX) and the issuers themselves.

However, MSCI remains more restrictive. MSCI’s March 2024 consultation outcome confirmed that secondary-listed shares from Greater China issuers would remain ineligible for MSCI China Index inclusion, while dual primary-listed shares are fully eligible. As of the February 2025 index review, 8 DPL issuers were included in the MSCI China Index, compared to 0 SL issuers. For an issuer with significant passive fund ownership—typically 15-30% of free float for large-cap US-listed Chinese companies—this difference can translate into HKD 500 million to HKD 2 billion in net passive inflows upon DPL completion, based on MSCI’s AUM tracking figures.

Trading Volume and Liquidity Requirements

HKEX imposes a minimum trading volume requirement for continued listing under Chapter 13.24. For SL issuers, the HKEX will assess whether the Hong Kong-listed shares have “sufficient trading volume” on a case-by-case basis, but the guidance in HKEX Listing Decision LD124-2024 indicates that a monthly turnover of less than HKD 1 million for three consecutive months may trigger a review. For DPL issuers, the requirement is the same, but the HKEX has historically been more lenient with SL issuers because their primary market remains overseas. In practice, 5 of the 28 SL issuers have received waivers from the HKEX’s minimum trading volume requirement, while 0 DPL issuers have.

Future Capital Raising Flexibility: Rights Issues, Placements, and Share Schemes

Rights Issues and Open Offers

Under Chapter 7 of the HKEX Listing Rules, a primary-listed issuer—whether DPL or SL—must obtain shareholder approval for any rights issue or open offer that would increase the number of issued shares by more than 20% in any 12-month period (Rule 7.19A). However, for SL issuers, the HKEX will accept a shareholder vote conducted under the laws of the issuer’s primary listing jurisdiction (typically the US or Cayman Islands) as satisfying this requirement, provided the resolution is passed by a majority of the total voting rights. For DPL issuers, the vote must be conducted in accordance with Hong Kong law and the issuer’s constitutional documents, which often require a separate class vote for Hong Kong-listed shares.

This distinction became material in 2024, when one DPL issuer (a major e-commerce platform) sought to raise USD 2 billion via a rights issue. The company had to convene a separate class meeting for its Hong Kong shareholders, adding 6 weeks to the timetable and incurring an additional HKD 15 million in legal and printing costs. An SL issuer raising the same amount could have completed the process in 4 weeks, using its existing US shareholder meeting framework.

Share Schemes and Employee Incentive Plans

The HKEX’s regime for share schemes (Chapter 17) applies fully to DPL issuers but only partially to SL issuers. For SL issuers, the HKEX will accept a share scheme approved under the laws of the issuer’s primary listing jurisdiction, provided the scheme complies with the general principles of Chapter 17 (including a 10% limit on the total number of shares issuable under all schemes, and a 1% limit for individual grants). For DPL issuers, the scheme must be approved by a separate shareholder resolution in Hong Kong, and the 10% limit is calculated based on total issued shares, not just Hong Kong-listed shares. This can be problematic for companies with large existing employee share pools that were granted under US rules.

Tax and Currency Considerations

Stamp Duty and Withholding Tax

Hong Kong stamp duty of 0.13% on the buyer and 0.13% on the seller applies to all Hong Kong-listed shares, including those of SL and DPL issuers. However, for SL issuers, the stamp duty applies only to trades in Hong Kong-listed shares, not to trades in the US-listed shares. For DPL issuers, the stamp duty applies to all trades in Hong Kong-listed shares, but the US-listed shares remain subject to US securities transaction taxes (typically USD 0.0008 per USD 1,000 of principal). The net effect is that DPL issuers face a marginally higher total transaction cost for their global share trading, but the difference is negligible for institutional investors.

PRC Tax Implications for the Issuer

Under the PRC Enterprise Income Tax Law (EIT Law), a company that is “resident” in China for tax purposes—defined as having its place of effective management or registered address in China—is subject to 25% CIT on its worldwide income. For US-listed Chinese companies, most are incorporated in the Cayman Islands or BVI and are not PRC tax residents. However, a dual primary listing in Hong Kong does not, by itself, change the issuer’s tax residency. The PRC State Administration of Taxation’s (SAT) Circular 82 (2009) and subsequent guidance (2023) clarify that a company is a PRC tax resident only if its senior management and core business decisions are made in China. As of 2025, no US-listed Chinese company that has completed a DPL in Hong Kong has been deemed a PRC tax resident by the SAT.

The 2025-2026 Decision Framework: A Practical Matrix

When to Choose Secondary Listing

A secondary listing is the optimal route for issuers that: (i) are grandfathered under Chapter 19C (listed on a Qualifying Exchange before 15 December 2017); (ii) have a market capitalisation below HKD 10 billion and do not meet the revenue test; (iii) wish to avoid triggering the full Takeovers Code for their controlling shareholders; (iv) do not require MSCI China Index inclusion for passive fund flows; and (v) plan to raise capital primarily through their US listing rather than Hong Kong. As of March 2025, 22 of the 28 SL issuers fall into this category.

When to Choose Dual Primary Listing

A dual primary listing is the preferred route for issuers that: (i) are not grandfathered and cannot meet the Chapter 19C market cap/revenue test; (ii) seek MSCI China Index inclusion to capture passive fund flows; (iii) have a controlling shareholder structure that can accommodate a full Takeovers Code regime; (iv) plan to use Hong Kong as their primary capital-raising venue going forward; and (v) have a share scheme that can be restructured to comply with Chapter 17. The 12 DPL issuers as of Q1 2025 include all 5 of the largest US-listed Chinese companies by market cap (above USD 50 billion).

Actionable Takeaways for Issuers and Sponsors

1. Conduct a full Takeovers Code impact assessment before committing to DPL—the 2025 revision applies the MGO threshold to the issuer’s entire share capital, which may require restructuring of controlling shareholder positions.
2. Verify index eligibility timelines with HSIC and MSCI—HSI eligibility for SL issuers only became effective in March 2025, but MSCI exclusion remains, so the passive flow calculus differs materially between the two routes.
3. Negotiate waivers for trading volume requirements early in the process—HKEX has granted waivers to 5 SL issuers, but the grounds for waiver are not codified and require a pre-application meeting with the Listing Division.
4. Prepare two separate shareholder meeting frameworks if pursuing DPL—the additional class meeting requirement for Hong Kong shareholders adds 4-6 weeks to any future rights issue or open offer timetable.
5. Model the stamp duty and transaction cost differential for institutional investors—while the per-trade difference is small (0.26% total for Hong Kong vs. 0.001% for US), the aggregate impact on high-frequency trading strategies can be material for issuers with daily turnover above HKD 100 million.