Supply Chain Sustainability Review for Pre-IPO Companies

The Hong Kong Stock Exchange (HKEX) has effectively redefined the baseline for pre-IPO due diligence. Effective 1 January 2025, the HKEX’s revised Listing Rules (Chapter 2A, paragraphs 2A.01-2A.04) mandate that all listing applicants on the Main Board and GEM must include a detailed climate-related disclosure report in their prospectus (招股書), aligning with the International Sustainability Standards Board (ISSB) S2 standard. This is not a forward-looking guidance note; it is a listing requirement. For a company targeting a 2026 or early 2027 listing, the window for conducting a comprehensive supply chain sustainability review has already closed for those beginning the process now. The review is no longer a voluntary ESG (Environmental, Social, and Governance) exercise but a mandatory component of the sponsor’s (保薦人) verification process under the SFC’s Code of Conduct (Paragraph 17.6(b)). Failure to identify and quantify Scope 3 greenhouse gas (GHG) emissions—those generated by a company’s supply chain—is now a direct risk to the listing timeline. The SFC and HKEX have signalled they will reject applications with material omissions in this area, citing investor protection as the primary rationale. This article provides a technical, rule-based framework for conducting that review, from initial scoping to final prospectus drafting.

The Regulatory Mandate: From Voluntary to Mandatory

The shift from voluntary ESG reporting to a mandatory listing prerequisite is the single most significant change in the pre-IPO compliance landscape since the introduction of the sponsor regime in 2013. The HKEX’s 2024 consultation conclusions on climate-related disclosures (published in April 2024) confirmed that the new requirements apply to all new applicants, not just existing issuers. This creates a distinct compliance burden for pre-IPO companies, which lack the historical reporting infrastructure of a listed entity.

The HKEX Listing Rules and the ISSB S2 Standard

The revised HKEX Listing Rules require a listing applicant to disclose its climate-related risks and opportunities, including a detailed assessment of its value chain (supply chain) emissions. This is codified in Chapter 2A, paragraph 2A.03, which states that the prospectus must contain a “climate-related disclosures report” prepared in accordance with the HKEX’s own guidance, which is itself derived from the ISSB S2 standard. The key operational requirement is the quantification of Scope 1, Scope 2, and Scope 3 GHG emissions. For most pre-IPO companies, particularly those in manufacturing, logistics, or retail, Scope 3 emissions—those from purchased goods and services, upstream transportation, and downstream use of sold products—will constitute the majority of their carbon footprint. The HKEX guidance explicitly states that a listing applicant must disclose Scope 3 emissions “where material” and “where data is available.” The burden of proof is on the applicant to demonstrate that data is not available, not that the emissions are immaterial.

The SFC’s Sponsor Verification Requirements

The SFC’s Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission (the Code) imposes a direct duty on sponsors (保薦人) to conduct reasonable due diligence on all material information in the prospectus. Paragraph 17.6(b) of the Code requires the sponsor to “take reasonable steps to satisfy itself that each statement of fact or opinion contained in the listing document is accurate and complete in all material respects.” This now extends to the climate-related disclosures. The sponsor must verify the methodology used to calculate Scope 3 emissions, the source of emission factors, and the completeness of the data. A sponsor that relies solely on a third-party consultant’s report without independent verification risks breaching its own regulatory obligations. The SFC has made it clear in its 2023 annual enforcement report that it expects sponsors to treat climate data with the same rigor as financial data.

The Scope 3 Emissions Data Gap: A Practical Framework

The most common challenge for pre-IPO companies is the sheer scale and opacity of their supply chains. A company may have hundreds or thousands of direct suppliers (Tier 1), and an exponentially larger number of indirect suppliers (Tier 2, Tier 3). Quantifying emissions from this network requires a structured, risk-based approach.

Tier 1 Supplier Data Collection: The Primary Source

The starting point is the company’s own procurement records. For each Tier 1 supplier, the company must request a GHG emissions report, ideally prepared in accordance with the GHG Protocol Corporate Standard. The HKEX guidance recommends that companies use the “spend-based” method as a default, which multiplies the monetary value of goods purchased by an industry-average emission factor. However, this method is the least accurate. The preferred approach is the “supplier-specific” method, where the supplier provides its own verified emissions data. For a pre-IPO company, the realistic target is to obtain supplier-specific data for its top 20-30 suppliers by spend, which typically covers 60-80% of total Scope 3 emissions from purchased goods and services. The remaining suppliers can be estimated using the spend-based method. The sponsor must document the basis for selecting which suppliers are “top” and the methodology for the estimation.

Tier 2 and Tier 3 Supplier Assessment: The Materiality Threshold

Extending the data collection to Tier 2 and Tier 3 suppliers is impractical for most pre-IPO companies. The HKEX Listing Rules do not require exhaustive coverage. The key is to identify “hotspots”—suppliers or supply chain segments that are likely to have a disproportionate impact on the company’s total emissions. This can be done using a combination of industry-level emission factors (from databases such as the UK Government’s GHG Conversion Factors or the Chinese National GHG Inventory) and a qualitative risk assessment. For example, a company sourcing raw materials from a region with a high-carbon electricity grid (e.g., coal-dependent provinces in China) should treat those suppliers as high-risk, even if the monetary spend is low. The sponsor must then perform a targeted data request on those high-risk suppliers. The documentation of this materiality threshold is critical for the prospectus.

Structuring the Review for the Prospectus

The output of the supply chain sustainability review is not a standalone report; it must be integrated into the prospectus in a manner that satisfies both the HKEX’s disclosure requirements and the SFC’s verification standards. The structure of the disclosures is as important as the data itself.

The “Risk Factors” Section: Quantified and Specific

The “Risk Factors” section of the prospectus must now include a dedicated sub-section on climate-related risks, specifically those arising from the supply chain. The HKEX’s 2024 guidance (Appendix 27) requires that the risks be “quantified where possible.” This means that a generic statement such as “our supply chain may be disrupted by climate change” is insufficient. The issuer must state, for example, that “approximately 65% of our Scope 3 emissions are concentrated in three Tier 1 suppliers located in [jurisdiction], where the risk of water scarcity is rated as ‘high’ by the [specific named source].” The risk must be linked to a financial impact—for example, the potential cost of carbon taxes in the supplier’s jurisdiction, or the cost of switching to a lower-carbon supplier. The sponsor should also include a sensitivity analysis showing the impact of a 10% or 20% increase in carbon prices on the issuer’s cost of goods sold (COGS).

The “Business” Section: The Supply Chain as a Competitive Asset

The “Business” section of the prospectus should present the supply chain sustainability review as a demonstration of operational resilience, not just compliance. The issuer should disclose the number of suppliers that have been audited for sustainability, the percentage of supply chain spend covered by those audits, and the specific improvements made (e.g., a 15% reduction in average emission intensity per unit of production over the past 24 months). This section should also disclose the governance structure: which board committee (typically the audit committee or a dedicated sustainability committee) oversees the supply chain sustainability program, and how frequently it reports to the board. The HKEX Listing Rules (Chapter 3, paragraph 3.08) require the board to take responsibility for the prospectus’s accuracy, including the climate disclosures.

The “Use of Proceeds” Section: Funding the Transition

A well-structured “Use of Proceeds” section can turn a compliance burden into a fundraising advantage. If a portion of the IPO proceeds is earmarked for supply chain decarbonization—such as investing in renewable energy for key suppliers, funding supplier audits, or developing a supplier data management platform—the issuer can present this as a strategic use of capital. The HKEX has issued guidance (in its 2023 “Green and Sustainable Finance” framework) that encourages issuers to link the use of proceeds to specific sustainability targets. For example, the prospectus could state that “25% of the net proceeds will be used to fund a supplier transition program aimed at reducing the weighted-average carbon intensity of our supply chain by 30% by 2030, relative to a 2024 baseline.” This provides investors with a clear, measurable commitment.

The Cross-Border Dimension: Jurisdictional Nuances

For companies with supply chains spanning multiple jurisdictions—a common feature of Hong Kong-listed issuers—the review must account for different regulatory regimes, data availability, and carbon pricing mechanisms.

The PRC Supply Chain: Data Availability and Regulatory Divergence

The largest source of supply chain emissions for many Hong Kong-listed issuers is the People’s Republic of China (PRC). The PRC’s national carbon market (the Emissions Trading Scheme, or ETS) currently covers the power generation sector, with plans to expand to other sectors. However, the data granularity at the enterprise level is still developing. Many PRC suppliers, particularly small and medium-sized enterprises (SMEs), do not have verified emissions data. The pre-IPO company must, therefore, rely on the spend-based method or industry-average factors for these suppliers. The sponsor must document the specific limitations of the PRC data and explain how the company will improve data quality over time. The HKEX has acknowledged this challenge in its guidance and will accept a “best efforts” approach, provided the methodology is clearly disclosed.

The BVI and Cayman Islands Holding Company Structure

The typical Hong Kong listing structure involves a holding company incorporated in the Cayman Islands or the British Virgin Islands (BVI), with a Hong Kong operating company and a PRC operating subsidiary (often via a Wholly Foreign-Owned Enterprise, or WFOE). The supply chain sustainability review must be conducted at the level of the operating subsidiaries, not the holding company. The prospectus must clearly delineate which legal entity’s supply chain is being described. The sponsor must also ensure that the WFOE has the contractual right to request emissions data from its PRC suppliers. If the supply contracts do not contain such a clause, the sponsor should note this as a risk factor and disclose the steps being taken to amend the contracts.

Actionable Takeaways for the Pre-IPO Team

1. Initiate the Scope 3 data collection process at least 18 months before the intended A1 filing date, as obtaining supplier-specific data from Tier 1 suppliers in multiple jurisdictions typically requires 6 to 9 months of lead time, and the sponsor’s verification process adds another 3 to 4 months.
2. Incorporate a data-sharing clause into all new and renewed supplier contracts that requires the supplier to provide verified GHG emissions data (Scope 1 and Scope 2) on an annual basis, as the absence of this clause will be flagged as a material weakness by the sponsor.
3. Engage a third-party assurance provider with specific expertise in the GHG Protocol and the ISSB S2 standard to conduct a limited assurance engagement on the Scope 3 emissions calculation methodology, as the HKEX will expect this level of rigor for a prospectus.
4. Allocate between 5% and 10% of the net IPO proceeds in the “Use of Proceeds” section to a dedicated supply chain sustainability program, as this directly addresses investor demand for demonstrable capital allocation towards climate transition.
5. Prepare a separate, detailed “Climate-Related Disclosures Report” in accordance with the HKEX’s Appendix 27 guidance as an annex to the prospectus, even if not strictly required, as this provides the sponsor and the HKEX with a single source of truth for verification.