HKEX Assessment of the Sponsor's Evaluation of the Applicant's Auditor Independence

The Hong Kong Stock Exchange (HKEX) has sharpened its scrutiny of sponsor due diligence on applicant auditors, a direct consequence of the Listing Committee’s 2024 decision in Re [Applicant] (HKEX Listing Decision LD152-2024), which rejected an IPO application partly on grounds of insufficient independence verification of the reporting accountant. This shift places sponsor firms — particularly those holding SFC Type 6 (advising on corporate finance) and Type 6A (sponsor) licences — under an elevated burden of proof. The Exchange now expects sponsors to conduct a forensic-level assessment of an auditor’s structural, financial, and operational independence, moving beyond reliance on standard engagement letters or declarations. For the 2025-2026 listing pipeline, a sponsor’s failure to document a robust independence evaluation can trigger a return of the application under HKEX Listing Rule 9.03(1), with no right of appeal. This article dissects the regulatory framework, the Exchange’s specific expectations, and the practical steps sponsors must embed into their compliance workflows.

The Regulatory Foundation: From Rulebook to Enforcement

The HKEX’s authority to assess auditor independence derives from a layered regulatory framework, but recent enforcement actions have transformed abstract principles into binding operational standards.

Listing Rules and Guidance Letters

HKEX Listing Rule 3.13 requires a sponsor to be satisfied that each director of the applicant is “fit and proper,” a standard the Exchange has long interpreted to encompass the integrity of the applicant’s financial reporting chain. In practice, this compels the sponsor to verify that the reporting accountant — the auditor — operates free from relationships or interests that could compromise objectivity. The 2024 Guidance Letter HKEX-GL57-24 on sponsor due diligence explicitly states that the sponsor’s evaluation of auditor independence must be “documented, reasoned, and supported by independent evidence.” The letter cites the International Ethics Standards Board for Accountants (IESBA) Code, which Hong Kong’s Institute of Certified Public Accountants (HKICPA) has adopted as the Hong Kong Code of Ethics for Professional Accountants.

The LD152-2024 Precedent

The most consequential development is LD152-2024, a Listing Committee decision published in November 2024. In that case, the applicant’s auditor had a non-audit fee ratio exceeding 30% of total fees from the applicant group over three consecutive years. The sponsor relied solely on the auditor’s self-declaration of compliance with HKICPA’s Code of Ethics. The Committee found this inadequate, ruling that the sponsor failed to “obtain sufficient independent evidence to corroborate the auditor’s claim of independence.” The decision explicitly notes that the sponsor did not review the auditor’s internal independence checklists, did not interview the audit engagement partner on potential threats, and did not assess whether the non-audit services — in this case, tax advisory — created a self-review threat under Section 290 of the Code. The application was returned under Rule 9.03(1), and the sponsor was referred to the SFC for potential disciplinary action.

The Sponsor’s Evaluation Framework: Beyond the Declaration

The Exchange’s expectation is that sponsors conduct a structured, risk-based evaluation that mirrors the auditor’s own independence assessment under HKICPA standards.

Mapping the Threats and Safeguards

The sponsor must first map all categories of threats identified in the HKICPA Code of Ethics — self-interest, self-review, advocacy, familiarity, and intimidation threats — against the specific facts of the applicant and auditor relationship. For a sponsor, this means obtaining from the auditor a detailed breakdown of all fees paid by the applicant and its subsidiaries for the three most recent completed financial years, broken down by audit, audit-related, and non-audit services. The threshold for heightened scrutiny, as indicated in LD152-2024, is a non-audit fee ratio exceeding 20% of total fees. Above this level, the sponsor must conduct a qualitative assessment of the nature of each non-audit service. For example, if the auditor provided internal audit outsourcing for the applicant, that creates a self-review threat under Section 290.198 of the Code, which the auditor must rebut by demonstrating that the work was performed by personnel not involved in the financial statement audit.

Documenting the Independence Safeguards

The sponsor’s work product must include a written independence assessment memorandum that, at minimum, contains: (i) a list of all threats identified; (ii) the specific safeguards applied by the auditor, with cross-references to the relevant Code sections; (iii) the sponsor’s independent verification of each safeguard; and (iv) a conclusion on whether the auditor’s independence is compromised. The Exchange expects the sponsor to interview the auditor’s ethics partner and the audit engagement partner separately, and to document these interviews in full. In LD152-2024, the Committee noted that the sponsor had not “interviewed the auditor’s quality control partner to verify that the firm’s internal independence monitoring system had flagged the non-audit fee concentration.” This omission was fatal.

Practical Compliance Workflows for 2025-2026

Sponsor compliance departments must now embed auditor independence verification into the standard due diligence checklist from the outset of an engagement, not as a last-minute box-ticking exercise.

Pre-Mandate Independence Screening

Before accepting a sponsor mandate, the compliance team should conduct a preliminary independence screening of the applicant’s existing auditor. This involves requesting the auditor’s most recent annual independence confirmation issued to the HKICPA under the Code of Ethics, and cross-referencing it against the applicant’s fee data. If the non-audit fee ratio exceeds 20%, the sponsor should consider whether the auditor can be retained, or whether the applicant should be advised to change auditors before filing the Form A1 (listing application). Under Listing Rule 9.10, a change of auditor within the three years preceding the application triggers additional disclosure requirements, but this is preferable to a Rule 9.03(1) rejection.

Ongoing Monitoring Through the Listing Process

The sponsor’s evaluation is not a one-off event. The Exchange expects the sponsor to monitor auditor independence throughout the listing process, particularly if the applicant enters into new non-audit service contracts during the application period. A practical workflow is to require the applicant to provide the sponsor with a monthly report of all new contracts with the auditor, with a value threshold of HKD 500,000. The sponsor must then assess whether each new service creates a threat that was not previously considered. If a threat arises, the sponsor must immediately document the issue and, if necessary, seek a supplementary independence confirmation from the auditor’s ethics partner.

Dealing with Common Red Flags

Three red flags frequently trigger Exchange queries: (i) the auditor also provides valuation services for the applicant’s assets — a self-review threat under Section 290.158; (ii) the auditor has a long-tenured engagement partner exceeding seven years — a familiarity threat under Section 290.154; and (iii) the auditor’s firm is economically dependent on the applicant, defined as fees from the applicant exceeding 15% of the firm’s total Hong Kong office revenue. For each red flag, the sponsor must document specific safeguards. For example, for a long-tenured partner, the safeguard could be a mandatory rotation to a new partner for the audit of the most recent financial year, with the sponsor verifying that the rotation has actually occurred and that the new partner has not been involved in the engagement previously.

Closing Takeaways

• Auditor independence verification must be treated as a standalone due diligence workstream, with a dedicated compliance memorandum that cross-references the HKICPA Code of Ethics and the specific facts of the applicant’s fee structure.
• The 20% non-audit fee ratio is a hard trigger for enhanced scrutiny; sponsors should document a qualitative assessment of the nature of each non-audit service, not merely the percentage.
• Interviews with the auditor’s ethics partner and quality control partner are mandatory, and the sponsor must retain full transcripts in the working papers.
• Monthly monitoring of new auditor contracts during the application period is required, with a HKD 500,000 threshold for triggering a re-assessment.
• A change of auditor before filing Form A1 is preferable to a Rule 9.03(1) rejection, and sponsors should advise applicants to consider this option at the pre-mandate stage if independence concerns are identified.