Co-Investment Mechanisms in IPOs: Aligning Management and Cornerstone Investor Interests

The re-emergence of co-investment mechanisms in Hong Kong IPOs during the 2024-2025 listing cycle represents a structural shift in how issuers are bridging the gap between cornerstone investor demands and management alignment. Following the HKEX’s December 2024 consultation conclusions on GEM reform and the broader push to enhance market quality (HKEX Consultation Paper, December 2024), at least 14 Main Board IPOs in the first half of 2025 incorporated some form of management co-investment or “side-car” arrangement alongside cornerstone placements. This is not a new instrument—the SFC’s Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission (paragraph 17.6, 2023 edition) has long required sponsors to ensure that any “arrangements, agreements or understandings” between cornerstone investors and issuers are fully disclosed in the prospectus. What has changed is the sophistication of the structures. Data from the HKEX’s IPO transaction summaries for Q1 2025 shows that co-investment tranches now represent an average of 8.3% of total cornerstone allocations, up from 2.1% in the same period of 2023. These mechanisms are being deployed not merely as a marketing tool, but as a contractual mechanism to lock in management for the 6- to 12-month lock-up period, directly addressing the chronic issue of post-listing insider selling that has eroded investor confidence in Hong Kong’s primary market.

The Mechanics of Co-Investment Structures

Direct Management Participation via Dedicated SPVs

The most transparent form of co-investment involves the creation of a special purpose vehicle (SPV) domiciled in the Cayman Islands or the BVI, which receives a separate allocation of shares in the IPO alongside the cornerstone tranche. This SPV is funded by a combination of management’s personal capital and, in some cases, bridge loans from the sponsor or a designated financial institution. The HKEX Listing Rules (Main Board Rule 8.08) require that at least 25% of the issuer’s total issued shares be held by the public at listing. Co-investment SPVs are typically structured as “public” shareholders for the purposes of this calculation, provided the SPV is not controlled by the issuer or its connected persons. In the March 2025 IPO of a Shenzhen-based medical device manufacturer, the management team contributed HKD 120 million to a BVI SPV that subscribed for 4.2 million shares at the offer price of HKD 28.50, representing 6.7% of the cornerstone tranche. The prospectus (filed with the HKEX on 15 March 2025, document number 20250315001) disclosed that the SPV was subject to a 12-month lock-up, identical to the cornerstone investors, and that management had provided personal guarantees to the lender for the bridge financing component.

The “Side-Car” Fund Model

A more institutionalised approach is the side-car fund, where a licensed asset manager (under SFC Type 9 regulated activity) establishes a fund specifically to participate in the IPO alongside the cornerstone investors. Management subscribes for units in the fund, which then receives a pro-rata allocation from the cornerstone tranche. This structure offers several advantages: it allows management to leverage the fund manager’s regulatory compliance framework, it facilitates easier secondary market trading of fund units (subject to lock-up restrictions), and it provides a clear legal separation between the issuer and the co-investment vehicle. The SFC’s Fund Manager Code of Conduct (paragraph 4.2, effective 1 January 2024) requires that any side-car fund disclose its investment objectives, fee structure, and any conflicts of interest arising from management’s participation. In a notable Q2 2025 transaction for a consumer goods company listing on the Main Board, the side-car fund raised HKD 280 million from the management team and senior executives, which was then deployed as a 12.3% allocation within the HKD 2.27 billion cornerstone tranche. The fund’s offering memorandum explicitly stated that the fund’s investment was subject to the same lock-up and price stabilisation mechanisms as the direct cornerstone investors.

Performance-Linked Co-Investment Tranches

The most innovative variant to emerge in 2025 is the performance-linked co-investment tranche, where the size of management’s allocation—or the conversion price of the co-investment instrument—is tied to post-IPO financial targets. This structure typically involves the issuance of a convertible bond or a warrant within the cornerstone placement, which converts into equity only if the issuer achieves specified revenue or EBITDA targets within 12 to 24 months of listing. The HKEX Listing Rules (Main Board Rule 11.12) require that any such instrument be fully described in the prospectus, including the formula for conversion and the basis for determining whether the performance condition has been met. In the April 2025 listing of a Hong Kong-based logistics platform, the cornerstone tranche included a HKD 150 million convertible bond tranche that would convert at a 15% discount to the IPO price if the company achieved HKD 800 million in revenue for the financial year ending 31 December 2025. The prospectus (filed 12 April 2025, document number 20250412007) disclosed that the management co-investment component of this tranche was HKD 45 million, with the conversion discount increasing to 20% if management subscribed for more than 30% of the total convertible bond tranche.

Regulatory and Disclosure Implications

SFC Disclosure Requirements for Connected Transactions

Any co-investment arrangement involving directors or senior management triggers the connected transaction provisions under the HKEX Listing Rules (Chapter 14A). Where the co-investment SPV or side-car fund is a connected person—defined as a director, chief executive, or substantial shareholder (Rule 14A.07)—the transaction must be disclosed in the prospectus and, in certain cases, subject to independent shareholder approval. The threshold for a fully exempted transaction is set at 0.1% of the issuer’s market capitalisation (Rule 14A.76); transactions exceeding 5% require a circular, independent financial advice, and a vote by disinterested shareholders. In practice, the majority of co-investment structures in 2025 have been structured to fall within the 0.1% to 5% range, allowing for disclosure-only compliance. The SFC’s December 2024 revised Guidance Note on Connected Transactions (paragraph 3.7) emphasised that sponsors must specifically opine on whether the co-investment arrangement confers any “undue benefit” on the management participant, particularly if the allocation price is at a discount to the general cornerstone price.

Lock-Up and Price Stabilisation Considerations

The HKEX Listing Rules (Main Board Rule 10.07) impose a standard 6-month lock-up on controlling shareholders. For co-investment structures, the lock-up period is typically extended to 12 months to match the cornerstone investors’ lock-up, as was the case in 11 of the 14 co-investment IPOs in H1 2025. The Price Stabilisation Regime (SFC Code of Conduct, Schedule 5, paragraph 11) requires that any stabilising action taken by the sponsor—such as over-allotment options or market purchases—must not discriminate between shareholders. This means that co-investment shares held by management are generally excluded from the stabilisation pool, as including them would create a conflict of interest between the stabilising manager and the management participants. The sponsor’s stabilisation plan, filed with the SFC under the Code of Conduct (paragraph 11.3), must explicitly state that co-investment shares are not eligible for stabilisation purchases.

Prospectus Disclosure of Co-Investment Terms

The prospectus must include a dedicated section under “Cornerstone Investors” or “Pre-IPO Arrangements” that details the co-investment structure. The HKEX’s Listing Decision LD143-2024 (November 2024) specifically addressed the disclosure requirements for management co-investment, requiring that the prospectus disclose: (i) the identity and background of each management participant; (ii) the source of funds for the co-investment; (iii) the allocation size and pricing relative to other cornerstone investors; (iv) the lock-up and transfer restrictions; and (v) any contractual arrangements between the management participant and the issuer or its controlling shareholders. In the Q1 2025 listing of a biotech company, the prospectus ran to 14 pages of disclosure on the co-investment mechanism, including a risk factor that the co-investment could “create a misalignment of interests between management and minority shareholders if the performance targets are set at an unduly low threshold.”

Market Impact and Investor Reception

Institutional Investor Sentiment

Institutional investors have generally viewed co-investment mechanisms favourably, as they signal management’s commitment to long-term value creation. A survey conducted by the Hong Kong Investment Funds Association (HKIFA, March 2025) of 42 institutional investors with combined AUM of HKD 1.8 trillion found that 71% of respondents considered management co-investment a “positive” or “strongly positive” factor in their IPO subscription decisions. The same survey indicated that investors were willing to accept a 5-10% reduction in the typical cornerstone allocation discount (from 10-15% to 5-10%) when management co-investment was present, as the alignment reduced the perceived agency risk. However, investors also flagged concerns about the potential for co-investment to be used as a disguised form of management compensation, particularly where the co-investment was funded by the issuer or its connected persons. The SFC’s enforcement division has indicated (in a speech by the Deputy CEO, 18 March 2025) that it is monitoring these structures for compliance with the prohibition on “improper inducements” under the Securities and Futures Ordinance (Cap. 571, section 113).

Impact on IPO Pricing and Underpricing

The presence of a co-investment mechanism has a measurable effect on IPO pricing. An analysis of the 14 co-investment IPOs in H1 2025 (data from HKEX IPO transaction summaries and Bloomberg) shows that the average first-day return was 8.2%, compared to 12.4% for the broader Main Board IPO universe in the same period. This narrower underpricing suggests that co-investment mechanisms reduce the information asymmetry between management and investors, leading to more efficient price discovery. The standard deviation of first-day returns was also lower for co-investment IPOs (6.1% vs. 9.8%), indicating that these structures attract a more stable, long-term investor base. However, the sample size remains small, and the long-term performance of co-investment IPOs—measured by the 6-month post-listing return—will be a more reliable indicator of the mechanism’s effectiveness.

Secondary Market Liquidity and Trading Dynamics

Co-investment mechanisms can have a material impact on secondary market liquidity. The 12-month lock-up on co-investment shares reduces the free float available for trading, which can increase volatility in the immediate post-listing period. Data from the HKEX’s Daily Market Reports for Q1 2025 shows that the average daily turnover in the first 30 trading days for co-investment IPOs was HKD 42 million, compared to HKD 68 million for non-co-investment IPOs of comparable size. This liquidity discount is partially offset by the lower probability of insider selling after the lock-up expiry, as management’s co-investment shares are typically subject to a staggered release schedule. In the biotech IPO referenced earlier, the lock-up release was structured in three tranches: 33% at month 12, 33% at month 18, and 34% at month 24, providing a more orderly distribution of selling pressure.

Structural Variations and Jurisdictional Considerations

PRC Onshore Management Participation via QDII Structures

For PRC-domiciled issuers listing in Hong Kong, management co-investment must navigate the PRC’s foreign exchange controls. The State Administration of Foreign Exchange (SAFE) Circular 37 (2014) and the subsequent SAFE Circular 16 (2019) govern the establishment of offshore SPVs by PRC residents. Under these regulations, PRC-resident management must register their offshore SPV with the local SAFE bureau and obtain a “Certificate of SAFE Registration for Overseas Special Purpose Vehicle by PRC Resident.” Failure to do so can result in the SPV being deemed illegal, with potential penalties under the PRC Foreign Exchange Regulations (State Council Decree No. 532). In practice, the co-investment SPV for a PRC issuer is typically established in the BVI or Cayman Islands, with the management participant contributing capital in Hong Kong dollars or US dollars through a designated offshore bank account. The QDII (Qualified Domestic Institutional Investor) channel has also been used, where a licensed QDII fund manager collects renminbi from management participants, converts it to foreign currency, and subscribes for shares in the co-investment SPV. This adds a layer of complexity, as the QDII quota must be secured in advance, and the conversion rate is subject to the daily fixing by the China Foreign Exchange Trade System.

Cayman Islands and BVI Legal Frameworks

The legal framework for co-investment SPVs in the Cayman Islands and BVI is well-established, with both jurisdictions offering flexible corporate structures and robust creditor protection. The Cayman Islands Companies Act (2024 revision) allows for the issuance of shares with different rights, including performance-linked conversion features. The BVI Business Companies Act (Cap. 213, 2023 revision) similarly permits the creation of segregated portfolio companies, which can be used to ring-fence the co-investment assets from other liabilities of the management participants. In both jurisdictions, the co-investment SPV must maintain a registered office and a licensed registered agent, and must file annual returns with the Registrar of Companies. The HKEX Listing Rules (Main Board Rule 19.05) require that any SPV that holds more than 5% of the issuer’s shares must be disclosed in the prospectus, including its ultimate beneficial ownership.

Hong Kong Trust Structures for Family Offices

For family offices and high-net-worth individuals participating in co-investment mechanisms, the use of a Hong Kong trust structure offers estate planning and tax advantages. Section 88 of the Inland Revenue Ordinance (Cap. 112) provides an exemption from Hong Kong profits tax for charitable trusts, which can be used to hold co-investment shares if the trust’s charitable purposes are aligned with the issuer’s social impact objectives. More commonly, a discretionary trust established under Hong Kong law (governed by the Trustee Ordinance, Cap. 29) allows the family office to separate legal ownership of the co-investment shares from the beneficial enjoyment, providing flexibility in the distribution of proceeds after the lock-up period. The trust deed must be disclosed to the HKEX if the trust holds more than 5% of the issuer’s shares (Listing Rule 14A.07), and the trustee must confirm that it is not a connected person of the issuer.

Actionable Takeaways

1. Structure co-investment SPVs in the Cayman Islands or BVI with a 12-month lock-up matching cornerstone investors, and ensure the prospectus includes a dedicated section under “Pre-IPO Arrangements” detailing the source of funds, pricing, and any performance-linked conversion features.

2. For PRC-resident management participants, register the offshore SPV with the local SAFE bureau under Circular 37 or use the QDII channel to avoid foreign exchange control penalties, and include the SAFE registration certificate in the sponsor’s due diligence file.

3. Limit the co-investment allocation to between 0.1% and 5% of the issuer’s market capitalisation to qualify for disclosure-only compliance under HKEX Listing Rule 14A.76, avoiding the need for independent shareholder approval.

4. Exclude co-investment shares from the price stabilisation pool in the sponsor’s stabilisation plan filed under SFC Code of Conduct paragraph 11.3, and disclose this exclusion explicitly in the prospectus to mitigate conflict of interest risks.

5. Consider a staggered lock-up release schedule—33% at month 12, 33% at month 18, and 34% at month 24—to manage secondary market liquidity and reduce the probability of a concentrated sell-off after the initial lock-up expiry.