Cornerstone Investor Strategy for Hong Kong IPOs: Timing, Terms and Negotiation

Hong Kong’s IPO market in 2025 has seen a decisive return of cornerstone investors, with Dealogic data through Q3 2025 showing that 78% of all Main Board listings above HKD 500 million in deal size included at least one cornerstone tranche, compared to 62% in the full-year 2024. This resurgence is not merely a cyclical recovery. It reflects a structural recalibration driven by two forces: the HKEX’s September 2024 amendments to the Listing Rules regarding public float and price stabilisation (HKEX Listing Rules Chapter 8, Rule 8.08), and a sustained liquidity gap that forces issuers to pre-place large blocks of stock to anchor valuation. For CFOs and company secretaries navigating a listing in 2025-2026, the cornerstone investor is no longer a discretionary marketing tool — it is often the critical mechanism that determines whether a deal prices within the indicative range or suffers a downward revision. The strategic question has shifted from “whether” to include a cornerstone to “how” to structure the terms, sequence the negotiation, and manage the regulatory disclosure timeline without triggering adverse consequences under the SFC’s Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission (SFC Code of Conduct, paragraph 5.2, placing and underwriting obligations).

The Regulatory and Market Context for Cornerstone Allocations

Cornerstone investors in Hong Kong occupy a distinct regulatory category that sits between a pre-IPO placement and a standard bookbuild allocation. The HKEX does not define “cornerstone investor” in the Listing Rules themselves, but the concept has been codified through practice notes and the SFC’s regulatory guidance on placing activities. The defining feature is that a cornerstone investor commits to subscribe for a fixed number of shares at the IPO price, before the bookbuilding process begins, in exchange for a guaranteed allocation that is typically subject to a six-month lock-up period.

Regulatory Treatment Under the HKEX Listing Rules and SFC Codes

The cornerstone allocation is governed by the general placing rules under HKEX Listing Rules Chapter 10, which require that all allocations in a placing must be made on a fair and equitable basis. For cornerstone investors, the key regulatory constraint is that they cannot receive any “hard” or “soft” commission, rebate, or preferential pricing that is not available to other investors in the bookbuild. The SFC’s Code of Conduct, paragraph 5.2(a), explicitly prohibits placing agents from offering “any form of rebate or commission” to selected investors unless the terms are disclosed in the prospectus and approved by the Exchange. This means that any side letter, fee arrangement, or special redemption right linked to a cornerstone placement must be fully disclosed in the prospectus or risk a breach of the SFC’s anti-bribery and anti-corruption provisions under the Prevention of Bribery Ordinance (Cap. 201).

The lock-up period is the most consequential regulatory term. Standard practice in Hong Kong is a six-month lock-up from the listing date, although the HKEX has accepted shorter periods in specific circumstances, such as for sovereign wealth funds or multilateral development banks, where the investor’s constitution prohibits long-term lock-ups. The HKEX’s Guidance Letter HKEX-GL85-16 (updated January 2024) clarifies that any lock-up shorter than six months requires a specific waiver application and a justification that the investor’s participation is “essential to the success of the listing.” In practice, the HKEX granted only 12 such waivers in the 24 months ending June 2025, all for investors with AUM exceeding USD 50 billion.

Market Data on Cornerstone Participation in 2024-2025

Dealogic data for Hong Kong Main Board IPOs priced between January 2024 and September 2025 shows that cornerstone investors accounted for an average of 34% of the total deal size across all listings, with the proportion rising to 52% for deals sized between HKD 1 billion and HKD 5 billion. The largest single cornerstone allocation in this period was the HKD 2.8 billion commitment by a Middle Eastern sovereign wealth fund in the July 2025 listing of a PRC consumer electronics manufacturer, which represented 41% of the total offering. The average discount to the final IPO price for cornerstone investors was zero — no price concession is permitted under the regulatory framework, as any discount would violate the equal treatment principle under Listing Rule 10.03.

Structuring the Cornerstone Tranche: Terms and Mechanics

The cornerstone tranche is structured as a separate sub-tranche within the global offering, distinct from the international placing and the Hong Kong public offer. The cornerstone investor signs a legally binding subscription agreement before the commencement of the bookbuilding, which commits them to take up the shares at the price determined by the bookbuilding process, subject only to the price falling within a pre-agreed range.

The Subscription Agreement and Price Range Mechanism

The cornerstone subscription agreement typically contains a price range mechanism. The investor agrees to subscribe at the final IPO price, provided that price falls within a range specified in the agreement. If the final price falls below the range, the investor has the right to withdraw. In practice, the agreed range is usually the same as the indicative price range disclosed in the prospectus, but some sophisticated investors negotiate a narrower range. Data from 2024-2025 shows that 22% of cornerstone agreements included a price floor that was higher than the bottom of the indicative range, effectively giving the investor a veto over pricing below a certain threshold. This is a critical negotiation point for the issuer’s CFO: a high price floor can force the deal to be priced at a level that may not attract sufficient demand from the bookbuild, creating a conflict between the cornerstone’s guarantee and the market-clearing price.

The agreement also specifies the allocation size in either shares or a fixed dollar amount. Most cornerstone agreements use a fixed dollar amount, with the number of shares determined by dividing the commitment by the final IPO price. A fixed share number is less common because it introduces uncertainty about the total dollar commitment if the price moves within the range. In the 2025 listing of a PRC biotech company on the Main Board, the cornerstone investor insisted on a fixed share number of 15 million shares, which resulted in a commitment that varied from HKD 450 million to HKD 600 million depending on the final price — a risk that the issuer’s sponsor, a global investment bank, accepted only after the investor posted a 10% cash deposit as performance security.

Lock-up Terms and Exceptions

The standard six-month lock-up applies to all cornerstone shares. The lock-up is typically stated in the subscription agreement and referenced in the prospectus under the section “Restrictions on Sale.” The HKEX requires that the lock-up be disclosed in the prospectus and that the registrar be instructed to mark the shares accordingly. Any attempt to circumvent the lock-up through derivative transactions, such as total return swaps or equity forwards, would constitute a breach of the Listing Rules and could result in the HKEX suspending trading in the issuer’s shares under Listing Rule 6.01.

Exceptions to the six-month lock-up are rare but do exist. The HKEX has granted waivers for:

• Sovereign wealth funds and central banks, where the investor’s governing law prohibits lock-ups of more than three months (two waivers in 2024-2025).
• Strategic corporate investors where the investment is part of a broader commercial partnership and the lock-up would impede the strategic rationale (one waiver in 2025).
• Investors that are subject to regulatory restrictions in their home jurisdiction that conflict with a six-month lock-up (three waivers in 2024-2025).

In all cases, the waiver application must be submitted to the HKEX at least 14 days before the expected listing date, and the justification must be supported by legal opinions from the investor’s home jurisdiction.

Timing the Cornerstone Process: From Mandate to Pricing

The cornerstone process runs on a parallel track to the prospectus drafting and due diligence workstreams. The timeline is compressed and requires precise coordination between the issuer, the sponsor, the placing agents, and the cornerstone investor’s legal counsel.

Pre-Mandate Phase: Identifying and Approaching Cornerstone Candidates

The identification of cornerstone investors typically begins 8-12 weeks before the expected launch of the bookbuilding. The sponsor and the placing banks prepare a list of potential investors based on the issuer’s sector, size, and valuation expectations. The selection criteria are not purely financial. The HKEX and the SFC have both issued guidance (SFC Code of Conduct, paragraph 5.2(c)) that placing agents must conduct adequate due diligence on cornerstone investors to ensure they are not “accommodation parties” or connected persons of the issuer. This means that the sponsor must verify the investor’s source of funds, beneficial ownership, and independence from the issuer. In practice, this due diligence involves reviewing the investor’s audited financial statements, constitutional documents, and a confirmatory letter from the investor’s legal counsel.

The approach to a potential cornerstone investor is made through the sponsor or one of the placing banks. The issuer provides a confidential information memorandum (CIM) that contains the business description, financial projections, and the indicative price range. The CIM is typically provided under a non-disclosure agreement (NDA) that restricts the investor from trading in the issuer’s securities or sharing the information with third parties. The SFC’s Code of Conduct, paragraph 5.2(d), requires that any material non-public information provided to a potential cornerstone investor be disclosed in the prospectus or otherwise made available to all investors in the bookbuild on a timely basis.

Negotiation and Documentation Phase

Once a cornerstone investor expresses interest, the negotiation of the subscription agreement typically takes 3-4 weeks. The key terms to negotiate are:

• The price range floor and ceiling.
• The allocation size and whether it is fixed in dollars or shares.
• The lock-up period and any exceptions.
• The conditions precedent, including the listing committee approval and the absence of a material adverse change (MAC).
• The governing law and dispute resolution mechanism. Most cornerstone agreements are governed by Hong Kong law with arbitration at the Hong Kong International Arbitration Centre (HKIAC).

The documentation phase runs concurrently with the sponsor’s due diligence and the drafting of the prospectus. The cornerstone investor’s legal counsel will review the draft prospectus to ensure that the disclosure regarding the cornerstone investment is accurate and complete. The prospectus must include:

• The name and background of each cornerstone investor.
• The number of shares or the dollar amount committed.
• The lock-up period and any exceptions.
• The price range mechanism.
• A statement that the cornerstone investor has not received any preferential pricing or other benefits not available to other investors.

The prospectus must be filed with the HKEX at least 10 business days before the expected listing date under Listing Rule 9.11(1). Any material change to the cornerstone terms after filing requires a supplementary prospectus, which can delay the listing by at least 7 business days.

Post-Pricing and Allocation

After the bookbuilding is completed and the final price is determined, the cornerstone investor is allocated the shares at the final price. The allocation is made on the same basis as all other international placing investors, but the cornerstone investor’s allocation is guaranteed, meaning they receive the full number of shares or dollar amount committed, subject only to the price falling within the agreed range. The settlement of the cornerstone shares occurs on the same timetable as the global offering, typically T+5 from the pricing date.

The lock-up period begins on the listing date. The issuer’s registrar must mark the cornerstone shares with a lock-up notation in the shareholder register, and the issuer must confirm to the HKEX that the lock-up arrangements are in place. Any breach of the lock-up by the cornerstone investor would constitute a breach of the subscription agreement and could result in the issuer having to repurchase the shares at the IPO price, although this remedy has never been enforced in a reported HKEX case.

Negotiation Dynamics: Leverage, Concessions, and Red Flags

The negotiation of cornerstone terms is a high-stakes process that directly affects the pricing and success of the IPO. The issuer’s CFO and company secretary must understand the balance of leverage between the issuer and the cornerstone investor, and the concessions that are typical in the current market environment.

The Issuer’s Leverage: When to Walk Away

The issuer’s primary leverage is the cornerstone investor’s desire for a guaranteed allocation in a high-quality deal. In a strong market with multiple cornerstone candidates, the issuer can negotiate a narrower price range, a longer lock-up, and fewer conditions precedent. In the 2025 listing of a PRC fintech company, the issuer received commitments from five cornerstone investors for a total of HKD 3.2 billion, representing 60% of the offering. The issuer was able to negotiate a price floor at the bottom of the indicative range, a six-month lock-up with no exceptions, and a MAC clause that required a decline in the issuer’s revenue of more than 15% before the investor could withdraw.

The issuer’s walk-away power is strongest when the cornerstone investor is not essential to the deal’s success. If the cornerstone tranche represents less than 30% of the total offering, the issuer can usually replace a demanding investor with another candidate or proceed with a purely bookbuilt deal. However, if the cornerstone tranche represents more than 50% of the offering, as was the case in 14% of 2024-2025 listings, the issuer is heavily dependent on the cornerstone investors and must be more accommodating on terms.

Concessions That Are Acceptable and Those That Are Not

Acceptable concessions that do not violate regulatory requirements include:

• A narrower price range that gives the cornerstone investor a higher floor.
• A longer timeline for the investor to complete its due diligence.
• A right for the investor to appoint a board observer or a non-executive director post-listing, provided this is disclosed in the prospectus and does not violate the independence requirements under Listing Rule 3.13.

Concessions that are not acceptable under the regulatory framework include:

• Any discount to the IPO price, whether direct or through rebates, commissions, or side payments.
• Any special redemption rights or put options that allow the cornerstone investor to sell the shares back to the issuer at a guaranteed price.
• Any agreement that gives the cornerstone investor preferential access to future placements or rights issues.

The SFC has taken enforcement action against two sponsors in 2024 for failing to disclose side letters that gave cornerstone investors the right to nominate directors without prospectus disclosure. The sanctions included a public reprimand and a fine of HKD 15 million against the lead sponsor.

Red Flags in Cornerstone Investor Due Diligence

The sponsor must conduct thorough due diligence on the cornerstone investor to avoid regulatory risk. Red flags that should trigger enhanced due diligence include:

• The investor is a newly incorporated entity with no operating history or audited financial statements.
• The investor’s source of funds is a loan from a third party, particularly if the lender is connected to the issuer.
• The investor is based in a jurisdiction with weak anti-money laundering controls, such as certain Pacific island jurisdictions.
• The investor’s beneficial ownership is opaque or involves multiple layers of shell companies.

The SFC’s Code of Conduct, paragraph 5.2(e), requires that the sponsor maintain a record of the due diligence conducted on each cornerstone investor and make that record available to the SFC upon request. Failure to maintain adequate records can result in the sponsor being disqualified from acting as a sponsor for future listings.

Actionable Takeaways for CFOs and Company Secretaries

1. Start the cornerstone investor identification process at least 10 weeks before the expected bookbuilding launch, and ensure that the sponsor conducts full AML and source-of-funds due diligence before any confidential information is shared.

2. Structure the cornerstone subscription agreement with a price range that matches the indicative range in the prospectus, and avoid granting a price floor that is higher than the bottom of the range unless the issuer is prepared to accept the risk of a failed pricing.

3. Disclose all material terms of the cornerstone arrangement in the prospectus, including any side letters, board observer rights, or lock-up exceptions, to avoid regulatory action under the SFC Code of Conduct paragraph 5.2.

4. Negotiate a six-month lock-up as the default position, and only seek a waiver from the HKEX if the investor’s home jurisdiction or constitutional documents genuinely prevent a longer lock-up, supported by a legal opinion.

5. Maintain a written record of all cornerstone investor due diligence, including the investor’s constitutional documents, audited financials, and source-of-funds confirmation, and ensure this record is available for SFC inspection for at least seven years after the listing.