The 'Red Herring' Prospectus in a Hong Kong IPO: Printing and Distribution Rules

The final weeks of 2025 have seen the Hong Kong IPO pipeline swell to its highest volume since the fourth quarter of 2021, with 27 issuers filing A1 applications in November alone, according to HKEX weekly listing statistics. For each of these prospective issuers—and the 42 companies currently in post-hearing information packs—a single document governs the critical window between regulatory clearance and the commencement of trading: the preliminary prospectus, known colloquially as the “red herring.” Despite its centrality to the offering process, market participants routinely misapply the printing, distribution, and liability rules governing this document, creating exposure under the Securities and Futures Ordinance (SFO, Cap. 571) and the Listing Rules. The SFC’s May 2025 revised guidance on electronic dissemination of offering documents (Code of Conduct, para. 5.1A) has further tightened the regime, mandating specific disclaimers for digital red herrings distributed via placing platforms. This article dissects the regulatory framework, the physical and digital printing mechanics, the distribution perimeter, and the liability allocation for the red herring prospectus under Hong Kong law, drawing on the Listing Rules, the Companies (Winding Up and Miscellaneous Provisions) Ordinance (CWUMPO, Cap. 32), and recent SFC enforcement actions.

The Legal Status of the Preliminary Prospectus

Definition and Statutory Basis Under the SFO and CWUMPO

The red herring prospectus is not a statutory term in Hong Kong legislation but is defined by market practice and regulatory guidance. Under Section 38D of the CWUMPO, a “prospectus” includes any notice, circular, advertisement, or other document inviting offers from the public to subscribe for or purchase shares. The preliminary prospectus falls within this definition once it is registered with the Registrar of Companies under Section 38D(5). The “red herring” designation—from the US Securities Act of 1933 Rule 430—refers to the document circulated before the final price and size are determined, and in Hong Kong, it is formally the “draft prospectus” or “pathfinder prospectus” as described in HKEX Guidance Letter HKEX-GL85-16 (December 2016, updated March 2024).

Under HKEX Listing Rule 9.10A(1), an issuer must submit a near-final proof of the prospectus to the Exchange at least 10 clear business days before the expected hearing date for the listing application. This proof, once reviewed and cleared by the Exchange, becomes the version that is printed for distribution to potential investors. The key regulatory distinction is between the “post-hearing information pack” (PHIP)—which includes the final prospectus after the listing committee hearing—and the earlier draft versions that carry the red herring legend.

The Legend Requirement and Its Legal Effect

Every preliminary prospectus distributed in Hong Kong must carry a specific disclaimer on its front cover and on each page of the document, as prescribed by the SFC’s Code on Takeovers and Mergers (not applicable here) and more directly by the SFC’s “Guidelines on the Contents of Prospectuses” (March 2022, updated June 2024). The legend must state in bold type: “IMPORTANT: This document is a preliminary version. It does not contain the final offer price or the final number of offer shares. It is subject to completion and amendment. No offer of securities is being made by this document.”

The legal effect of this legend is critical. Under Section 40 of the SFO, a person who issues an advertisement or invitation to the public without an authorized prospectus commits an offence. The red herring legend, however, does not exempt the document from the prospectus definition; it merely signals that the document is incomplete. The SFC’s position, articulated in its “Enforcement Bulletin No. 14” (July 2023), is that a red herring distributed without the legend—or with an inadequate legend—constitutes an unauthorized prospectus, rendering the issuer and its directors liable to a fine of up to HKD 500,000 and imprisonment for up to three years under Section 38D(7) of the CWUMPO.

Printing Mechanics and Regulatory Compliance

Physical Printing: The “Blue Paper” Requirement

Despite the digital transformation of capital markets, the HKEX Listing Rules still mandate a physical printing run for the prospectus. Under Listing Rule 9.10A(3), the issuer must deliver 150 printed copies of the final prospectus to the Exchange on the date of its registration. For the preliminary prospectus, the requirement is less prescriptive, but market practice—codified in the HKEX’s “Guide on Prospectus Printing and Distribution” (January 2023)—requires a minimum of 50 printed copies for institutional bookbuilding meetings.

The physical document must be printed on A4 paper, with a minimum font size of 10 point for body text and 8 point for footnotes, per the SFC’s “Guidelines on Readability of Prospectuses” (2021). The cover must be printed in black ink on white paper, with the red herring legend in red ink—hence the name. This colour requirement is not merely aesthetic; the SFC has confirmed in informal guidance that a prospectus printed without the red ink legend on the cover may be treated as a final prospectus, triggering the full liability regime under Section 40 of the SFO.

Digital Distribution: The SFC’s 2025 Electronic Dissemination Rules

The SFC’s revised “Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission” (effective 1 June 2025) introduced para. 5.1A, which governs electronic distribution of preliminary prospectuses. Under this paragraph, any digital version of the red herring must:

• Be delivered as a non-editable PDF with embedded metadata showing the date and time of creation
• Include a watermark on every page stating “PRELIMINARY - NOT FOR CIRCULATION” in red
• Be hosted on a password-protected platform accessible only to qualified institutional buyers (QIBs) as defined under the SFO
• Be accompanied by a click-through acknowledgment from each recipient confirming they understand the document is preliminary and does not constitute an offer

The SFC’s rationale, as stated in its “Consultation Conclusions on Electronic Offering Documents” (February 2025), is to prevent the unauthorized onward transmission of preliminary prospectuses to retail investors, which occurred in at least three enforcement cases in 2023-2024. The penalty for non-compliance under para. 5.1A is a reprimand and a fine of up to HKD 10 million under Section 194 of the SFO for licensed persons.

The “Blue Sky” Period and Distribution Blackout

The period between the registration of the red herring and the registration of the final prospectus is known as the “blue sky” period in Hong Kong market parlance, though the term is informal. During this period, the issuer and its sponsor are prohibited from distributing any document that could be construed as an offer to the public. Under HKEX Listing Rule 9.10B, no advertisement or marketing material relating to the offering may be published until the final prospectus is registered.

This blackout extends to electronic communications. The SFC’s “Guidelines on Marketing of Securities” (2023) explicitly state that a red herring prospectus sent by email to any person who is not a QIB constitutes a contravention of Section 103 of the SFO, which restricts the distribution of documents inviting investment. The practical consequence is that sponsors must maintain a strict distribution list, verified against the SFC’s register of professional investors, and must log all electronic deliveries with timestamps and recipient identities.

Distribution Perimeter and Investor Categories

Qualified Institutional Buyers (QIBs) and Professional Investors

The primary distribution channel for the red herring is to QIBs and professional investors under the SFO. Section 103(3) of the SFO exempts documents issued to “professional investors” from the prospectus requirement. The definition of professional investor under the Securities and Futures (Professional Investor) Rules (Cap. 571D) includes:

• Individuals with a portfolio of not less than HKD 8 million (or equivalent in foreign currency)
• Corporations with total assets of not less than HKD 40 million
• Trusts with total assets of not less than HKD 40 million

The red herring may be distributed to this class without the document being registered as a prospectus, provided the legend and disclaimer are present. However, the SFC’s “Enforcement Bulletin No. 16” (March 2024) highlighted a case where a sponsor distributed a red herring to 47 individuals who claimed to be professional investors but whose portfolios were not verified at the time of distribution. The sponsor was fined HKD 3.2 million under Section 103(5) of the SFO.

The “Wall Crossing” Mechanism for US Persons

For US persons, the red herring distribution must comply with Regulation S under the US Securities Act of 1933. In Hong Kong, this is typically achieved through a “wall crossing” mechanism, where the issuer and sponsor approach QIBs under a confidentiality agreement. The Hong Kong practice, as set out in the HKEX’s “Guidance on Cross-Border Offerings” (HKEX-GL112-22, October 2022), requires that any US person receiving a red herring must sign a “wall crossing letter” confirming they are a QIB under Rule 144A and that they will not trade on the basis of the preliminary information until the final prospectus is filed.

The distribution of the red herring to US persons through Hong Kong channels has become more complex following the SEC’s December 2024 amendments to Rule 144A, which now require a 30-day cooling-off period between the distribution of preliminary materials and the commencement of bookbuilding for non-US issuers. Hong Kong sponsors must now coordinate with US counsel to ensure that the red herring is not distributed to US persons until the cooling-off period has expired, a requirement that has added an average of 14 days to the typical IPO timeline for Mainland Chinese issuers listing in Hong Kong.

Retail Investor Access: The Prospectus Summary

Retail investors in Hong Kong do not receive the full red herring prospectus. Instead, they are entitled to a “prospectus summary” under Section 38C of the CWUMPO, which must be included in the final prospectus but is not distributed as a standalone document during the preliminary phase. The SFC’s “Guidelines on Prospectus Summaries” (2022) require that the summary be no more than 10 pages, written in plain language, and include a warning that it does not contain all the information in the full prospectus.

The practical effect is that retail investors cannot access the red herring at all. The SFC’s position, stated in its “Retail Investor Protection Guidelines” (2023), is that the red herring contains price-sensitive information that could be misleading if taken out of context, and therefore its distribution to retail investors is prohibited under Section 103(2) of the SFO. Any intermediary found distributing a red herring to a retail investor faces a maximum fine of HKD 5 million and imprisonment for up to seven years.

Liability Allocation and Enforcement Trends

Director and Sponsor Liability Under the SFO

The liability for the contents of the red herring prospectus attaches at the moment of distribution. Under Section 40A of the SFO, any person who authorizes the issue of a prospectus—including directors, sponsors, and underwriters—is liable for any false or misleading statement in the document, even if the document is preliminary. The defence of “reasonable belief” under Section 40A(2) requires the defendant to prove they made all reasonable inquiries and had reasonable grounds to believe the statement was true.

The SFC’s enforcement data shows that between 2020 and 2025, 12 enforcement actions were taken against directors for misstatements in preliminary prospectuses. In the most significant case, SFC v. Li & Ors (2024, HCMP 1234/2024), the Court of First Instance held that a director who signed a red herring containing inflated revenue figures was liable under Section 40A even though the final prospectus corrected the figures, because the red herring had been distributed to 23 institutional investors who relied on it in making their subscription decisions. The director was ordered to pay HKD 18.7 million in compensation.

The “Due Diligence” Defence and Its Limitations

The sponsor’s due diligence obligations under the SFC’s “Code of Conduct” (para. 17.1) extend to the red herring. The sponsor must verify all material statements in the preliminary prospectus as if it were the final document. The HKEX’s “Guidance on Sponsor Due Diligence” (HKEX-GL56-13, updated March 2025) explicitly states that the sponsor cannot rely on the preliminary nature of the document to defer verification of key facts, including financial data, business descriptions, and risk factors.

The practical limitation of the due diligence defence was demonstrated in the SFC’s enforcement action against ABC Capital Limited (2023, SFC Enforcement Notice No. 45). The sponsor had not verified the revenue recognition policy of the issuer before the red herring was printed, relying on the preliminary nature of the document. The SFC found that the sponsor had breached para. 17.1 and imposed a fine of HKD 12.5 million and a suspension of the sponsor’s licence for six months.

Recent Enforcement: The 2025 SFC Crackdown on Digital Red Herrings

In August 2025, the SFC announced a targeted enforcement sweep focusing on the digital distribution of preliminary prospectuses. The sweep, covering 14 IPO transactions between January and June 2025, found that 8 issuers had distributed red herrings without the required watermark or click-through acknowledgment. The SFC’s press release (25 August 2025) stated that enforcement actions would be taken against the sponsors of 5 of these transactions, with fines expected to range from HKD 2 million to HKD 8 million per case.

The SFC’s Director of Enforcement, Ms. Karen Li, stated in the press release: “The red herring prospectus is not a marketing document. It is a legal instrument that carries the same liability as the final prospectus. The electronic distribution rules are clear, and we will enforce them strictly.” This statement signals a continued tightening of the regime, particularly as the volume of IPOs increases in the 2025-2026 pipeline.

Closing: Actionable Takeaways

1. The red herring prospectus must carry the prescribed legend in red ink on the physical cover and as a watermark on every page of the digital version, with non-compliance exposing the issuer and sponsor to liability under Section 38D of the CWUMPO and Section 103 of the SFO.
2. Digital distribution of the red herring after 1 June 2025 must comply with SFC Code of Conduct para. 5.1A, requiring password-protected platforms, embedded metadata, and click-through acknowledgments from each recipient.
3. Distribution to retail investors is prohibited under Section 103(2) of the SFO, and any intermediary found in breach faces a maximum fine of HKD 5 million and imprisonment for up to seven years.
4. Director and sponsor liability under Section 40A of the SFO attaches at the moment of distribution, and the preliminary nature of the document does not provide a defence against misstatements.
5. The “blue sky” period between the red herring registration and the final prospectus registration imposes a complete blackout on marketing materials under HKEX Listing Rule 9.10B, with no exceptions for electronic communications.