The Relationship Between ADR Stocks and Hong Kong IPOs: The Impact of US-Listed Chinese Companies Returning to Hong Kong on ADR Investors

In early 2025, the Hong Kong Stock Exchange (HKEX) reported a surge in listing applications from US-listed Chinese companies, a trend that directly impacts holders of American Depositary Receipts (ADRs). This wave, driven by renewed US audit scrutiny under the Holding Foreign Companies Accountable Act (HFCAA) and geopolitical tensions, has created a specific procedural path for ADR investors. When a company delists from the New York Stock Exchange or Nasdaq to pursue a primary or secondary listing in Hong Kong, its ADR program typically terminates. The exchange or conversion mechanism for these depositary receipts into Hong Kong shares is governed by the terms of the deposit agreement, not by any statutory right. For investors holding ADRs in companies like Alibaba (BABA), JD.com (JD), or NetEase (NTES), understanding this process is critical. The transition from a US-traded ADR to a Hong Kong-listed stock involves specific deadlines, fees, and tax implications under Hong Kong’s Inland Revenue Ordinance (Cap. 112). This article explains the procedural relationship between ADR stocks and Hong Kong IPOs, focusing on the steps an investor must take when a US-listed Chinese company returns to Hong Kong.

The Mechanics of ADR Termination Upon a Hong Kong IPO

The first principle an investor must understand is that an ADR is not a direct share of the underlying company. It is a negotiable certificate issued by a US depositary bank, representing a specific number of underlying shares held in custody, often in Hong Kong. When a company lists in Hong Kong, the depositary bank—typically JPMorgan Chase, Citibank, or BNY Mellon—will issue a notice of termination for the ADR program. The HKEX Listing Rules (Chapter 19C) provide the regulatory framework for secondary listings by overseas issuers, but the conversion mechanics are contractual.

Step 1: The Depositary Bank Issues a Termination Notice

Under the standard deposit agreement, the depositary bank must give ADR holders at least 30 days’ notice before terminating the program. This notice is filed with the US Securities and Exchange Commission (SEC) as a Form 6-K or 20-F amendment. The notice will specify a final conversion date. After this date, the ADR will cease trading on the US exchange. The investor’s only option is to surrender the ADRs for the underlying Hong Kong shares. The depositary bank will charge a cancellation fee, typically between USD 0.05 and USD 0.10 per ADR, plus any applicable stamp duty under Hong Kong’s Stamp Duty Ordinance (Cap. 117).

Step 2: Converting ADRs into Hong Kong Shares

To convert, the investor must instruct their US broker to deliver the ADRs to the depositary bank. The depositary bank will then cancel the ADRs and instruct the Hong Kong custodian to release the underlying shares. These shares are then credited to the investor’s Hong Kong securities account. The investor must have a Hong Kong brokerage account capable of holding shares in the Central Clearing and Settlement System (CCASS). The conversion ratio is fixed in the deposit agreement. For example, one Alibaba ADR (BABA) represents eight ordinary shares. Upon conversion, the investor receives eight Hong Kong-listed shares (9988.HK). The HKEX’s 2024 annual report noted that over 90% of returning US-listed companies used a secondary listing structure under Chapter 19C, which allows the Hong Kong shares to be fungible with the US ADRs.

Tax Implications for ADR Investors Under Hong Kong Law

The conversion from ADR to Hong Kong shares is a taxable event in the United States, but for Hong Kong tax purposes, the treatment is different. The Inland Revenue Ordinance (Cap. 112) does not impose capital gains tax on the sale of shares. However, stamp duty applies to the transfer of Hong Kong shares.

Stamp Duty on Conversion

When the depositary bank cancels the ADR and transfers the underlying shares to the investor, a stamp duty charge arises. The Stamp Duty Ordinance (Cap. 117) provides that the rate is 0.13% on the buyer and 0.13% on the seller of the shares. In a conversion, the depositary bank acts as the seller and the investor as the buyer. The investor must pay the 0.13% buyer’s stamp duty on the value of the shares received. The depositary bank typically passes the seller’s stamp duty to the investor as part of the cancellation fee. The Inland Revenue Department (IRD) issued a practice note in 2023 clarifying that this conversion transaction is subject to stamp duty, as it constitutes a transfer of beneficial ownership.

No Capital Gains Tax in Hong Kong

A key advantage for Hong Kong-based investors is that the eventual sale of the Hong Kong-listed shares is not subject to capital gains tax. The IRD has consistently held that share trading by an individual is not a trade, business, or profession unless the individual is a professional trader. For the typical ADR investor, the sale of Hong Kong shares after conversion will not trigger a profits tax assessment. This contrasts with the US treatment, where the conversion itself may be a taxable exchange under Section 1031 of the Internal Revenue Code (not applicable to securities).

The Role of ADR Investors in the Hong Kong IPO Price Discovery

When a US-listed Chinese company lists in Hong Kong, the IPO price is often set at a discount to the US ADR price. The HKEX Listing Rules (Chapter 19C, Rule 19C.11) require that the offer price for a secondary listing must not be at a discount of more than 10% to the closing price of the ADR on the US exchange on the last trading day before pricing. This creates a direct arbitrage opportunity for ADR holders.

The Price Arbitrage Window

The arbitrage window opens when the Hong Kong IPO is priced. The HKEX requires the final offer price to be announced before the start of trading. If the discount is 5%, an ADR holder can sell the ADR short in the US and simultaneously buy the Hong Kong shares at the IPO price. The short position is closed by converting the ADRs into Hong Kong shares. This strategy is known as a “cross-market arbitrage.” The Securities and Futures Commission (SFC) of Hong Kong regulates this activity under the Securities and Futures Ordinance (Cap. 571). The SFC’s 2024 code of conduct requires that any short selling must be covered by a “locate” of the underlying shares.

Impact on ADR Trading Volume

The announcement of a Hong Kong IPO typically leads to a spike in ADR trading volume. Data from the HKEX’s 2024 market statistics showed that the average daily turnover of ADRs for returning companies increased by 40% in the 30 days before the Hong Kong listing. This is driven by institutional investors seeking to arbitrage the price gap. Retail investors should be cautious. The price of the ADR may decline as the conversion deadline approaches, as the arbitrage opportunity is priced in. The US Securities and Exchange Commission (SEC) has issued investor alerts on the risks of holding ADRs during a delisting process.

Practical Steps for ADR Investors When a Hong Kong IPO Is Announced

The process requires action within a narrow timeframe. The depositary bank’s termination notice is the trigger.

Step 1: Open a Hong Kong Brokerage Account

The investor must have a Hong Kong brokerage account capable of receiving shares in CCASS. This account must be with a broker that is a participant of HKEX. The investor should verify that the broker can handle the conversion process. Many major international brokers, such as HSBC, Standard Chartered, and Interactive Brokers, offer this service. The account must be opened before the final conversion date. The HKEX’s 2025 participant list shows that 600 brokers are CCASS participants.

Step 2: Instruct Your US Broker to Surrender the ADRs

The investor must contact their US broker and provide written instructions to surrender the ADRs. The broker will charge a fee for this service. The US broker will then deliver the ADRs to the depositary bank. The investor must confirm that the Hong Kong broker account details are correct. A mistake in the account number can delay the conversion by several weeks.

Step 3: Pay the Conversion Fees and Stamp Duty

The depositary bank will deduct the cancellation fee and stamp duty from the proceeds of the conversion. The investor should ensure sufficient funds are in the account. The stamp duty is calculated on the value of the shares at the time of conversion. The HKEX’s 2024 guidelines for secondary listings state that the conversion must be completed within 10 business days of the Hong Kong listing.

Key Takeaways

• An ADR holder must surrender the depositary receipts to the depositary bank before the final conversion date to receive Hong Kong-listed shares; failure to do so results in the depositary bank selling the underlying shares and remitting the net proceeds, which may be at a disadvantageous price.
• The conversion triggers a Hong Kong stamp duty liability of 0.13% on the buyer’s side, payable to the Inland Revenue Department under the Stamp Duty Ordinance (Cap. 117), which is deducted from the conversion proceeds.
• The HKEX Listing Rules (Chapter 19C) cap the discount on the Hong Kong IPO price at 10% relative to the US ADR closing price, creating a measurable arbitrage window for institutional investors but a potential price decline risk for retail holders.
• Hong Kong does not impose capital gains tax on the sale of shares, making the converted Hong Kong-listed stock a tax-efficient holding for individual investors under the Inland Revenue Ordinance (Cap. 112).
• The investor must open a Hong Kong brokerage account that is a CCASS participant before the conversion deadline, as the depositary bank will only deliver shares to a Hong Kong-based account.

This does not constitute legal advice. Consult a solicitor for your specific case.