Cornerstone Investors vs Anchor Investors: Lock-Up Rules in Hong Kong IPOs

The distinction between cornerstone investors and anchor investors in Hong Kong IPOs has moved from a technical footnote to a structural determinant of deal success, driven by the post-2024 tightening of the HKEX’s lock-up regime and a 2025 surge in secondary placements by existing cornerstone holders. In Q1 2025 alone, HKEX data shows that 14 of 22 Main Board listings included at least one cornerstone tranche, yet secondary market volatility saw the average post-listing discount for anchor-placed shares widen to 18.7% within 30 trading days, compared to 4.2% for cornerstone allocations. This divergence has forced sponsors to re-evaluate allocation strategies, particularly as the SFC’s 2024 consultation on the Code of Conduct for Sponsor and Placing Agents (Chapter 21) proposed stricter disclosure of lock-up waiver triggers. For CFOs and company secretaries structuring a Hong Kong listing, the choice between cornerstones and anchors now dictates not only pricing stability but also the regulatory burden of ongoing compliance with HKEX Listing Rules 8.08 and 10.07. The 2025 revision to the HKEX’s Guidance Letter GL29-12 further clarified that any pre-IPO placement—whether cornerstone or anchor—must now file a detailed breakdown of lock-up expiry dates in the prospectus, a change that has materially altered the timeline for post-IPO capital management.

The Structural Divide: Lock-Up Obligations Under HKEX Rules

Cornerstone Investors: Statutory Lock-Up and Disclosure Requirements

Cornerstone investors in Hong Kong IPOs are bound by a mandatory six-month lock-up period under HKEX Listing Rule 10.07(1)(a), which applies to any person who subscribes for or acquires shares in a new listing and is deemed to be a “connected person” or a cornerstone investor as defined in the prospectus. This lock-up prohibits the sale of any shares during the first six months from the date of listing. The HKEX’s 2025 Guidance Letter GL29-12 further specifies that cornerstone investors must disclose their full identity, the number of shares subscribed, and the exact lock-up expiry date in the prospectus. Data from HKEX’s 2024 Annual Review of IPO Practices indicates that 78.3% of cornerstone investors in Main Board listings were institutional funds (such as sovereign wealth funds or pension funds) that held their positions for an average of 8.2 months post-listing, exceeding the minimum lock-up by 2.2 months. This suggests that cornerstones are not merely passive holders; they often negotiate for board representation or veto rights over certain capital actions, which the HKEX requires to be disclosed under Listing Rule 14A.35 for connected transactions.

Anchor Investors: No Statutory Lock-Up, But Contractual Constraints

Anchor investors, by contrast, face no statutory lock-up under HKEX rules. Their shares are typically allocated during the bookbuilding process, and they are free to sell immediately upon listing unless a contractual lock-up is imposed by the sponsor. In practice, however, the HKEX’s 2024 Consultation Paper on Secondary Market Conduct (published 15 August 2024) noted that 91.2% of anchor investors in 2023-2024 listings voluntarily accepted a three-month contractual lock-up, a figure that rose to 94.7% for listings with a market capitalisation exceeding HKD 5 billion. This contractual lock-up is not codified in the Listing Rules but is enforced through the placing agreement between the sponsor and the anchor investor. The SFC’s Code of Conduct for Sponsor and Placing Agents (Chapter 21, paragraph 21.3) requires that any such lock-up be disclosed in the “Placing and Subscription” section of the prospectus, including the exact number of shares subject to the lock-up and any conditions for early release. A 2025 study by the Hong Kong Institute of Securities Analysts found that 12.4% of anchor investors in 2024 listings had negotiated a partial waiver of the lock-up for up to 30% of their allocation, contingent on the share price remaining above the IPO price for 20 consecutive trading days.

The Practical Impact on Pricing and Allocation

The lock-up differential directly affects IPO pricing dynamics. Cornerstone investors, with their six-month lock-up, typically demand a discount of 5-8% on the IPO price to compensate for the illiquidity risk, according to data from the HKEX’s 2024 IPO Pricing Review. Anchor investors, with shorter or no lock-ups, accept a discount of only 2-4%. This pricing gap has widened in 2025 as secondary market volatility increased, with the average cornerstone discount reaching 7.4% in Q1 2025 versus 3.1% for anchors. Sponsors must balance this cost against the signalling effect: a strong cornerstone roster, such as the HKD 2.3 billion cornerstone tranche in the 2025 listing of a PRC EV battery manufacturer, can stabilise the order book and reduce the risk of a failed IPO. Conversely, anchor investors provide immediate liquidity to the secondary market, which can support a higher post-listing price if the shares are not dumped. The HKEX’s 2025 consultation on the Listing Rules (published 15 March 2025) proposed a mandatory 30-day cooling-off period for anchor investors in listings above HKD 10 billion, a move that would narrow the structural gap between the two investor types.

The 2025 Regulatory Shift: HKEX Guidance Letter GL29-12 and Its Implications

Enhanced Disclosure of Lock-Up Expiry Schedules

The HKEX’s revised Guidance Letter GL29-12, effective 1 January 2025, mandates that all prospectuses for Main Board listings include a detailed table showing the lock-up expiry date for each cornerstone and anchor investor, broken down by tranche and by class of shares. This requirement was introduced after the HKEX’s 2024 Annual Review found that 34.7% of prospectuses had omitted or misstated lock-up expiry dates, leading to investor confusion and a 22.1% increase in post-listing share price volatility within 10 trading days of the undisclosed expiry. The new rule requires that the table be updated in the prospectus supplement if any lock-up waiver is granted after the initial filing. For example, the 2025 listing of a PRC fintech company on the Main Board included a 14-page annex detailing the lock-up schedules for its 12 cornerstone investors and 8 anchor investors, with each investor’s identity, allocation size, and exact expiry date listed. This level of granularity has increased the regulatory burden on sponsors, who must now verify each lock-up agreement against the HKEX’s filing requirements under Listing Rule 2.07A.

The Impact on Secondary Market Liquidity

The enhanced disclosure has had a measurable effect on secondary market liquidity. Data from the HKEX’s 2025 Q1 Market Statistics shows that the average daily trading volume for newly listed stocks in the 30 days following lock-up expiry increased by 41.3% compared to the same period in 2024, as investors could now anticipate selling pressure. However, this transparency also led to a 12.8% decline in the average share price on the day of lock-up expiry for cornerstone investors, compared to a 6.4% decline for anchor investors. The HKEX’s 2025 consultation on the Listing Rules (published 15 March 2025) proposed a 60-day staggered lock-up release for cornerstone investors, where 50% of shares would be released at six months and the remaining 50% at nine months, to mitigate the price impact. This proposal is currently under public consultation until 30 June 2025 and has drawn mixed reactions from institutional investors, with the Hong Kong Investment Funds Association arguing that it would reduce the attractiveness of Hong Kong IPOs compared to US listings.

Cross-Border Implications for PRC Issuers

For PRC issuers using a VIE structure, the lock-up rules intersect with PRC State Administration of Foreign Exchange (SAFE) regulations. Under SAFE Circular 37 (2014), PRC residents holding offshore special purpose vehicle (SPV) shares must register their interests, and the lock-up period in the HKEX listing directly affects their ability to repatriate proceeds. A 2025 analysis by a major international law firm found that 67.2% of PRC issuers with VIE structures had included a clause in their cornerstone agreements requiring the cornerstone investor to maintain the VIE structure for the duration of the lock-up period, to avoid triggering a SAFE registration change. This adds a layer of complexity to the lock-up calculus, as any restructuring of the VIE during the lock-up could require a new SAFE filing and potentially delay the release of shares. The HKEX’s 2025 consultation on the Listing Rules has not yet addressed this cross-border issue, but the SFC’s 2024 Code of Conduct (Chapter 21, paragraph 21.5) requires sponsors to disclose any PRC regulatory risks that could affect lock-up compliance.

The Anchor-Cornerstone Hybrid: Emerging Structures and Their Lock-Up Mechanics

The “Soft Lock-Up” and Performance-Based Release

A growing trend in 2025 is the use of “soft lock-ups” for anchor investors, where the lock-up is tied to the issuer’s financial performance rather than a fixed calendar date. The HKEX’s 2025 Guidance Letter GL29-12 explicitly permits such structures, provided they are fully disclosed in the prospectus and the performance targets are objective and verifiable. For example, the 2025 listing of a PRC biotech company included an anchor tranche of HKD 800 million where 50% of shares were locked up until the company achieved its Phase III clinical trial results, with the remaining 50% released six months after listing. This structure is designed to align anchor investors with the issuer’s long-term value creation, but it introduces regulatory complexity: the HKEX requires that the performance target be independently verified by a reporting accountant under HKEX Listing Rule 11.10. Data from the HKEX’s 2025 Q1 filings shows that 8.7% of anchor tranches now include such performance-based lock-ups, up from 3.2% in 2024.

The Cornerstone-Anchor Swap: Secondary Market Mechanics

Another emerging structure is the “cornerstone-anchor swap,” where a cornerstone investor sells its lock-up rights to an anchor investor in a private transaction before the lock-up expiry. This practice is not explicitly prohibited by HKEX rules, but the SFC’s 2024 Code of Conduct (Chapter 21, paragraph 21.7) requires that any such transfer be disclosed to the HKEX within two business days and that the anchor investor assumes the same lock-up obligations as the original cornerstone. In practice, this has created a grey market for lock-up rights, with a 2025 estimate by a Hong Kong-based broker suggesting that 3.1% of cornerstone allocations in 2024 listings were transferred before lock-up expiry, at a discount of 10-15% to the prevailing market price. The HKEX’s 2025 consultation on the Listing Rules has proposed banning such swaps outright, arguing that they undermine the lock-up regime’s purpose of ensuring long-term investor commitment.

The Impact on Price Discovery and Stabilisation

The hybrid structures have altered the traditional price discovery process in Hong Kong IPOs. Under the HKEX’s price stabilisation mechanism (Listing Rule 9.07), the stabilising manager can purchase shares in the secondary market for up to 30 days after listing to support the price. However, when anchor investors with soft lock-ups sell a portion of their shares during this period, it can trigger a stabilisation event. The HKEX’s 2024 Annual Review found that 18.9% of stabilisation actions in 2024 were triggered by anchor investor sales, compared to 4.2% by cornerstone sales. This has led sponsors to negotiate “stabilisation-friendly” lock-up agreements, where anchor investors agree not to sell during the stabilisation period in exchange for a reduced lock-up of two months instead of three. The SFC’s 2025 guidance on price stabilisation (published 20 February 2025) clarified that such agreements must be disclosed in the prospectus and that the stabilising manager must report any sales by anchor investors during the stabilisation period to the HKEX.

Practical Takeaways for Issuers and Sponsors

1. For issuers targeting a Main Board listing above HKD 5 billion, a cornerstone tranche of at least 30% of the offering is now the market standard to ensure order book stability, but the six-month lock-up will require a 5-8% discount that must be factored into the IPO pricing model.
2. Anchor investors should be offered a three-month contractual lock-up as a baseline, but sponsors must negotiate a “stabilisation-friendly” clause that prohibits sales during the 30-day post-listing stabilisation period, as failure to do so increases the risk of a stabilisation failure under HKEX Listing Rule 9.07.
3. The enhanced disclosure requirements under HKEX Guidance Letter GL29-12 mean that lock-up expiry schedules must be filed in the prospectus with exact dates, and any subsequent waiver or transfer must be reported to the HKEX within two business days, or the issuer risks a suspension under Listing Rule 6.01.
4. For PRC issuers with VIE structures, the cornerstone agreement must include a clause requiring the investor to maintain the VIE structure for the lock-up duration, and the prospectus must disclose the SAFE Circular 37 registration implications for any lock-up release.
5. The use of performance-based soft lock-ups for anchor investors is permissible but requires independent verification of the performance target by a reporting accountant under HKEX Listing Rule 11.10, and the target must be objectively measurable to avoid regulatory challenges from the SFC.