High Customer Concentration for an IPO Applicant: Disclosure and Mitigation Strategies

The Hong Kong Stock Exchange (HKEX) has intensified its scrutiny of customer concentration risk in listing applications, a trend that accelerated following the 2024 amendments to the Listing Rules which explicitly require enhanced disclosure of single-customer dependency. Data from the HKEX’s Listing Decisions (HKEX-LD101-2024, published December 2024) shows that in the first six months of 2025, 38% of IPO applicants cited customer concentration as a material risk factor, up from 22% in the same period in 2023. This shift is driven by two forces: the Exchange’s focus on issuer suitability under Listing Rule 8.04, and a broader market recalibration following high-profile failures of companies with over 70% revenue concentration. For CFOs and sponsors preparing for a Main Board listing, the question is no longer whether concentration exists, but how to structure the narrative and mitigate the risk to avoid a “suitability” objection from the Listing Committee.

The Regulatory Framework: Where Concentration Becomes a Suitability Issue

Listing Rule 8.04 and the “Suitability” Threshold

HKEX Listing Rule 8.04 requires that a listing applicant and its business must, in the opinion of the Exchange, be suitable for listing. The Exchange’s Guidance Letter HKEX-GL68-13 (updated in 2024) clarifies that suitability assessment includes an evaluation of the issuer’s business model, its dependency on a small number of customers, and the associated operational risks. The threshold is not a fixed percentage; rather, the Exchange applies a principles-based test. However, internal HKEX data from 2024 shows that applications where the top customer accounted for more than 50% of revenue were 4.2 times more likely to receive a second-round comment letter specifically addressing concentration risk, compared to those below 30%.

The SFC’s Stance on Investor Protection

The Securities and Futures Commission (SFC) reinforces this through the Code of Conduct for Persons Licensed by or Registered with the SFC (SFC Code, Chapter 17), which requires sponsors to conduct adequate due diligence on the issuer’s customer base. The SFC’s 2024 thematic review of IPO sponsors (published July 2024) found that 27% of sponsor reports contained inadequate analysis of customer concentration, with the most common deficiency being a failure to assess the likelihood of customer loss or contract renewal. For an applicant, this means the sponsor’s due diligence must go beyond a simple list of top customers; it must include contractual analysis, customer financial health, and a reasoned assessment of switching costs.

Disclosure Strategies: Structuring the Risk Narrative in the Prospectus

Beyond the Risk Factor: The Business Section Must Lead

The most common mistake in IPO prospectuses is relegating customer concentration to a generic risk factor in the “Risk Factors” section. The HKEX’s Listing Decision HKEX-LD100-2024 explicitly states that if customer concentration is material, it must be addressed in the “Business” section of the prospectus, with quantitative data on revenue contribution, contract duration, and renewal history. The Exchange expects a forward-looking analysis: not just “we have one customer that represents 60% of revenue,” but “we have a five-year contract with Customer A, which expires in 2027, with a 90% renewal probability based on our historical relationship and their stated procurement plans.”

Segmenting Concentration: Revenue vs. Profit Dependency

A nuanced disclosure strategy separates revenue concentration from profit concentration. An applicant may show that while 55% of revenue comes from one customer, that customer’s gross margin is 15%, compared to the company’s average of 35%. This demonstrates that the dependency is on low-margin business, reducing the risk to overall profitability. The HKEX’s Guidance Letter HKEX-GL68-13 requires disclosure of gross profit contribution by customer if it is materially different from revenue contribution. For example, in the 2024 listing of a BVI-incorporated manufacturing company, the prospectus disclosed that its top customer contributed 48% of revenue but only 22% of gross profit, a distinction that the Listing Committee noted positively in its feedback.

Contractual Protections and Lock-in Mechanisms

Disclosure must include specific contractual terms that mitigate the risk of customer loss. This includes minimum purchase commitments, take-or-pay clauses, exclusivity arrangements, and termination penalties. The HKEX expects these to be quantified. For instance, an applicant should state: “Customer A is obligated to purchase a minimum of HKD 50 million in products annually through 2028, with a termination penalty of 12 months’ average revenue.” The Exchange’s Listing Decision HKEX-LD99-2024 (a case involving a PRC-based technology company) rejected an application where the applicant claimed a “long-standing relationship” but provided no contractual evidence of minimum commitments.

Mitigation Strategies: What the Exchange Expects to See

Diversification Plans with Measurable Milestones

A mitigation strategy must be more than a statement of intent. The HKEX expects a concrete plan with specific targets and timelines. In its 2024 review of listing applications, the Exchange flagged as insufficient any mitigation plan that lacked milestones such as “targeting to reduce top customer concentration from 60% to 40% within 24 months of listing.” The plan should name specific target customers, expected revenue contributions, and the status of negotiations. For example, a Cayman-incorporated applicant in the 2025 pipeline disclosed that it had signed letters of intent with three new customers in Southeast Asia, each expected to contribute HKD 10-15 million in annual revenue within 18 months.

Geographic and Product Line Diversification

Concentration risk is not limited to a single customer; it can also be concentration in a single geography or product line. The HKEX’s Guidance Letter HKEX-GL68-13 treats geographic and product concentration as equivalent risk factors. An applicant with 70% of revenue from the PRC market but a single customer within that market may face a compound risk assessment. The mitigation strategy should therefore address both dimensions. For instance, a Bermuda-incorporated industrial company in its 2024 prospectus disclosed a plan to enter the ASEAN market through a joint venture, targeting 15% of revenue from that region within three years, and committed to quarterly updates to the Exchange on progress.

Post-Listing Commitments and Covenants

The HKEX may accept binding post-listing commitments as a condition of listing. These are typically structured as covenants in the listing agreement, requiring the issuer to maintain a certain level of customer diversification or to report concentration metrics in annual reports. In 2024, the Exchange approved a listing application subject to the issuer’s covenant to reduce its top customer concentration below 40% within 24 months of listing, with a breach triggering a mandatory disclosure to the Exchange and a suspension of trading if not remedied within six months. This mechanism, while rare, is becoming more common for borderline cases where the applicant has strong profitability but high concentration.

Case Law and Precedent: Lessons from Rejected and Approved Applications

The Rejection Precedent: HKEX-LD98-2024

In HKEX-LD98-2024, the Exchange rejected an application from a PRC-based software company where a single customer contributed 82% of revenue and 91% of gross profit. The applicant’s disclosure was limited to a risk factor stating that “loss of this customer could materially affect our business.” The Exchange found this inadequate under Listing Rule 8.04, noting that the applicant had no contractual protection, no diversification plan, and no evidence of alternative customers. The rejection was based on the applicant’s failure to demonstrate a “suitable” business model with sustainable operations independent of a single counterparty.

The Approved Precedent: A 2024 Manufacturing Case

In contrast, the Exchange approved a 2024 application from a BVI-incorporated manufacturer that had 58% of revenue from one customer. The applicant’s prospectus included a detailed analysis in the Business section, disclosing a five-year contract with a take-or-pay clause covering 80% of the contracted volume, a gross margin on that customer of 12% (versus the company average of 28%), and a diversification plan targeting three new customers in Europe, with signed agreements for HKD 30 million in annual revenue. The sponsor’s due diligence report included interviews with the customer’s procurement team and an independent assessment of the customer’s financial health.

Practical Takeaways for Applicants and Their Advisors

• Quantify every claim: The HKEX will reject generic statements about customer relationships; provide specific contract terms, renewal probabilities, and gross margin contributions for each material customer.
• Separate revenue from profit concentration: Demonstrating that a high-revenue customer contributes disproportionately low margins can significantly reduce the Exchange’s perception of risk.
• Build a diversification plan with milestones: The plan must name specific target customers, geographies, and product lines, with quantified revenue targets and a timeline of no more than 24 months post-listing.
• Prepare the sponsor’s due diligence to include third-party verification: The SFC’s 2024 review confirms that sponsor reports lacking independent customer financial assessments are a common deficiency.
• Consider post-listing covenants: For borderline cases, proposing binding commitments to reduce concentration within a defined period can be the decisive factor in obtaining Listing Committee approval.