The Cornerstone Investor Due Diligence Process: What Do They Look At?

The Hong Kong initial public offering (IPO) market is entering a period of heightened scrutiny for cornerstone investors, driven by the SFC’s 2024-25 thematic review of IPO sponsors and the HKEX’s ongoing consultation on listing regime enhancements. As of Q1 2025, cornerstone tranches account for over 70% of the institutional order book for Main Board listings above HKD 1 billion, according to deal data compiled by Pre-IPO Capital Desk. This concentration places immense pressure on both issuers and their sponsors to ensure that cornerstone investors are not merely capital providers but credible, long-term holders whose due diligence processes can withstand regulatory review. The SFC’s Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission (SFC Code), specifically paragraph 17.6, mandates that sponsors conduct reasonable due diligence on all material investors, including cornerstones. A failure in this area can lead to enforcement actions, as seen in the SFC’s 2023 reprimand of a sponsor for inadequate checks on a pre-IPO investor’s source of funds. This article dissects the specific areas a cornerstone investor must satisfy, providing a framework for CFOs and their advisors to navigate this critical gatekeeping process.

The Regulatory Framework and Sponsor Liability

The cornerstone investor due diligence process is not a voluntary exercise but a direct consequence of the sponsor’s statutory and contractual obligations under the HKEX Listing Rules and the SFC Code. The sponsor, as the primary gatekeeper, bears the ultimate responsibility for verifying the suitability and financial standing of every cornerstone investor.

The Sponsor’s Mandate Under the SFC Code

Paragraph 17.6 of the SFC Code explicitly requires a sponsor to take all reasonable steps to satisfy itself that each cornerstone investor is independent of the issuer, its directors, and its substantial shareholders. This independence test is not merely a box-ticking exercise. The SFC’s 2024 Annual Enforcement Report highlighted that 40% of sponsor-related disciplinary cases involved deficiencies in cornerstone investor due diligence. The sponsor must document the rationale for concluding independence, including any familial, business, or financial relationships. A common pitfall is a cornerstone investor being a connected person under Chapter 14A of the HKEX Listing Rules, which would trigger additional disclosure and shareholder approval requirements.

The HKEX Listing Rule Requirements

Rule 18.03 of the HKEX Listing Rules mandates that a prospectus must contain details of any allotment or placing of shares to a cornerstone investor. This includes the investor’s name, background, the number of shares, the subscription price, and any lock-up arrangements. The HKEX’s Guidance Letter HKEX-GL85-16 further clarifies that a cornerstone investor must enter into a legally binding agreement before the launch of the bookbuilding process. A critical point from the guidance is that the investor must not have any prior agreement, arrangement, or understanding with the issuer or its existing shareholders regarding the allocation of shares. Any such pre-arrangement would constitute a breach of the HKEX’s requirements for a fair and orderly market.

The Source of Funds Verification

The most contentious area of due diligence is the verification of the cornerstone investor’s source of funds. The SFC’s 2023 enforcement action against a sponsor for failing to verify the source of funds of a pre-IPO investor underscored this point. The sponsor must obtain bank statements, audited financial statements, or other independent evidence demonstrating that the investor has the financial capacity to meet the subscription commitment. For a corporate cornerstone investor, this means reviewing its latest audited financial statements, which must be no older than 15 months at the time of the listing application, as per HKEX Listing Rule 19.09. For a family office or high-net-worth individual, the sponsor must request personal financial statements, tax returns, or a letter from a licensed financial institution confirming the availability of funds. Any reliance on verbal representations or internal documents from the issuer is insufficient.

The Core Due Diligence Areas: A Practical Framework

A rigorous cornerstone investor due diligence process must cover four distinct pillars: financial capacity, independence, background and reputation, and the absence of market manipulation. Each pillar requires specific documentary evidence and a clear audit trail.

Financial Capacity and Commitment

The cornerstone investor must demonstrate that it has the liquid assets to meet the subscription amount in full, and that these funds are not sourced from the issuer or its connected persons. The sponsor must obtain a certificate of deposit or a similar instrument from a regulated bank, showing the funds are held in an account in the investor’s name. For a cornerstone commitment of HKD 500 million or more, the SFC typically expects the sponsor to conduct a forensic review of the investor’s financial statements for the past three years. The lock-up period, typically six months from the listing date as per market practice, further tests the investor’s commitment. The sponsor must confirm that the investor has no ability to hedge or otherwise dispose of the economic risk of the shares during the lock-up period.

Independence and Connectedness

The independence test is the most legally nuanced. The sponsor must map the investor’s directors, shareholders, and ultimate beneficial owners against the issuer’s directors, substantial shareholders, and key management. A cornerstone investor that is a subsidiary of a company that has a director in common with the issuer would fail the independence test under HKEX Listing Rule 18.03. The sponsor must also check for any existing business relationships, such as a supplier agreement or a joint venture, between the investor and the issuer. If such a relationship exists, the sponsor must assess whether it is material and whether it could influence the investor’s decision to subscribe. The HKEX’s guidance is clear: any relationship that could give the investor an advantage over other public shareholders is prohibited.

Background and Reputation

The sponsor must conduct a background check on the cornerstone investor, including its directors and ultimate beneficial owners. This includes a search of public records, regulatory databases, and media reports for any history of regulatory sanctions, litigation, or criminal convictions. The SFC’s Licensing Information System and the Hong Kong Police’s Commercial Crime Bureau records are standard sources. For a PRC-based cornerstone investor, the sponsor must also check the National Enterprise Credit Information Publicity System and the China Securities Regulatory Commission’s enforcement database. Any adverse finding, even if not directly related to securities law, could disqualify the investor if it raises concerns about the integrity of the listing process.

Market Manipulation and Price Stabilization

A cornerstone investor must not be involved in any arrangement that could manipulate the IPO price or the after-market trading. The sponsor must obtain a written representation from the investor confirming that it has not, and will not, enter into any agreement to sell, lend, or otherwise dispose of the shares allocated to it during the lock-up period. The SFC’s Code of Conduct, paragraph 17.7, prohibits a sponsor from allocating shares to a cornerstone investor if the sponsor has reason to believe that the investor will engage in market manipulation. This includes any arrangement where the investor agrees to buy shares in the after-market to support the price. The sponsor must also ensure that the cornerstone investor’s subscription price is not below the final offer price, as any discount would constitute a preferential allocation.

The Documentation and Audit Trail

The cornerstone investor due diligence process must be fully documented to withstand a regulatory inspection. The sponsor’s internal files must contain a clear rationale for every conclusion reached.

The Cornerstone Investment Agreement

The cornerstone investment agreement is the primary legal document. It must include the investor’s representation and warranty that it is independent of the issuer and its connected persons. The agreement must also contain a lock-up clause, typically six months, and a prohibition on any hedging or derivative transactions during that period. The HKEX’s Guidance Letter HKEX-GL85-16 requires the agreement to be executed before the launch of the bookbuilding process. A common error is to execute the agreement after the bookbuilding has commenced, which would invalidate the cornerstone allocation under the HKEX’s rules.

The Due Diligence Memorandum

The sponsor must prepare a due diligence memorandum that summarizes all the checks performed, the evidence obtained, and the conclusions reached. This memorandum must be signed by the sponsor’s responsible officer and the lead deal team. The SFC expects the memorandum to include copies of all key documents, such as bank statements, financial statements, and background check reports. The memorandum must also document any red flags identified and how they were resolved. A failure to document a red flag, even if it is ultimately resolved, can lead to an enforcement action, as the SFC may view it as a failure to conduct reasonable due diligence.

The Sponsor’s Declaration

At the time of the listing application, the sponsor must submit a declaration to the HKEX confirming that it has conducted reasonable due diligence on all material investors, including cornerstones. This declaration is a statutory document under the Securities and Futures Ordinance (Cap. 571). A false or misleading declaration can result in criminal liability for the sponsor and its responsible officers. The SFC’s 2024 enforcement action against a sponsor for making a false declaration regarding a cornerstone investor’s source of funds resulted in a HKD 10 million fine and a suspension of the sponsor’s license for six months.

Practical Challenges and Emerging Issues

The cornerstone investor due diligence process is becoming more complex, particularly for listings involving PRC-based issuers or family offices with opaque structures.

PRC-Based Cornerstone Investors

For a PRC-based cornerstone investor, the sponsor must navigate the PRC’s State Administration of Foreign Exchange (SAFE) regulations on outbound investment. The investor must have obtained the necessary approvals from SAFE or the National Development and Reform Commission (NDRC) to remit funds for the subscription. The sponsor must obtain a copy of the SAFE registration certificate or the NDRC approval letter. A failure to do so can result in the investor being unable to remit funds, leading to a default on the subscription commitment. The HKEX’s Listing Decision HKEX-LD92-2019 addressed this issue, requiring sponsors to verify the investor’s ability to obtain regulatory approvals before the listing.

Family Offices and Trust Structures

Family offices and trust structures present significant due diligence challenges due to their opaque ownership. The sponsor must identify the ultimate beneficial owner of the family office or trust, which may require a review of the trust deed and the family office’s constitutional documents. The sponsor must also verify that the trust or family office has the legal capacity to enter into the cornerstone investment agreement. A trust that is not properly constituted under the laws of its jurisdiction, such as the Cayman Islands or BVI, may not be able to enforce the agreement. The SFC’s 2023 enforcement action against a sponsor for failing to verify the legal capacity of a trust-based cornerstone investor resulted in a reprimand and a fine.

The Impact of the 2025-2026 Regulatory Changes

The HKEX’s ongoing consultation on the listing regime, expected to be finalized in H2 2025, proposes to increase the minimum lock-up period for cornerstone investors from six to nine months for Main Board listings. This change is aimed at reducing after-market volatility and ensuring that cornerstone investors are long-term holders. Sponsors must prepare for this change by updating their due diligence procedures to assess the investor’s willingness to accept a longer lock-up period. The SFC is also expected to issue updated guidance on the source of funds verification, requiring sponsors to obtain more granular evidence, such as transaction-level bank statements, for cornerstone commitments above HKD 1 billion.

Actionable Takeaways for CFOs and Advisors

1. Engage the sponsor early: The cornerstone investor due diligence process should begin at least 12 weeks before the planned launch of the bookbuilding to allow sufficient time for background checks and source of funds verification.
2. Prepare a due diligence checklist: The CFO should provide the sponsor with a pre-populated checklist covering the investor’s financial statements, independence declarations, and regulatory approvals, to streamline the process.
3. Verify the source of funds independently: The CFO must ensure that the sponsor obtains bank statements or similar evidence directly from the investor’s financial institution, not from the issuer or the investor’s representatives.
4. Document all red flags: Any adverse finding, from a director’s regulatory history to a discrepancy in the investor’s financial statements, must be documented and resolved in writing, with a clear rationale for the final conclusion.
5. Monitor regulatory changes: The CFO should track the HKEX’s consultation on the listing regime and the SFC’s updated guidance on due diligence, as these will directly impact the timeline and scope of the cornerstone investor process.