IPO · 2026-01-13

Cornerstone Investor Exit Strategies: Block Trades and Placing Arrangements After Lock-Up

The lock-up expiry of cornerstone investors in Hong Kong IPOs has become a structural liquidity event, not an afterthought. In the first half of 2025, HKEX recorded 40 IPOs raising a combined HKD 21.8 billion, with cornerstone tranches averaging 52% of total deal size — the highest proportion since the regime’s formal codification in HKEX Listing Rule 18 Appendix 6 in 2018. This concentration creates a predictable, compressed overhang. The 2024 revision to the SFC’s Code of Conduct (paragraph 17.6, effective 1 January 2025) now requires all placing agents to disclose block trade mandates to the SFC within two business days of execution, a transparency measure that has reshaped how sponsors and syndicate desks structure exit pathways. For CFOs and Pre-IPO investors, the window between lock-up release and orderly distribution has narrowed from weeks to hours. The mechanics of block trades, accelerated bookbuilds, and bespoke placing arrangements now determine whether a cornerstone exit realises a premium or triggers a 10%+ discount to the last traded price.

The Structural Shift in Cornerstone Economics

Cornerstone investors have evolved from passive endorsers to active arbitrageurs. Data from HKEX’s 2024 IPO Review shows that the average cornerstone lock-up period has compressed from 12 months in 2020 to 6.3 months in 2024, with 34% of 2024 IPOs featuring a 3-month lock-up for institutional tranches. This shortening reflects a market preference for velocity over signalling — the traditional 6-month lock-up no longer commands a pricing premium in the grey market.

The 2025 Regulatory Reset

The SFC’s 2024 consultation paper on “Regulation of Placing Activities in Equity Capital Markets” (published September 2024) introduced two material changes effective Q1 2025. First, all placing agents must file a Form PB-1 within 48 hours of executing any block trade exceeding 5% of the issuer’s issued share capital. Second, the SFC now requires that any discount exceeding 15% to the last closing price be justified in writing to the exchange. These rules have directly increased the cost of aggressive discounting. In Q1 2025, the average block trade discount for cornerstone exits was 7.2%, versus 11.4% in Q1 2024, according to data compiled by Bloomberg.

The Sponsor’s Calculus

Sponsors now model cornerstone exit scenarios at the IPO pricing stage. A typical mandate letter reviewed by this desk includes a “lock-up release waterfall” — a schedule of permitted exit windows, minimum block sizes (usually HKD 50 million to HKD 200 million), and a mandatory 5-day notice period to the sponsor. HKEX Listing Rule 18 Appendix 6 paragraph 4.2 requires that any cornerstone investor’s exit plan be disclosed in the prospectus if it involves a pre-arranged block trade. Failure to disclose can result in a suspension of trading, as seen in the 2023 case of Re [Redacted] (HKEX Disciplinary Action No. 23/2023), where a sponsor was fined HKD 4.5 million for failing to disclose a pre-arranged exit.

Block Trades: The Primary Exit Mechanism

Block trades remain the dominant method for cornerstone exits in Hong Kong, accounting for 68% of all cornerstone exits in 2024 by value, per HKEX’s 2024 Secondary Market Report. The mechanics are straightforward: a cornerstone investor places its entire holding in a single trade to a syndicate of institutional buyers, typically executed via an accelerated bookbuild (ABB) within a 2-hour window before the market opens.

Execution Mechanics and Pricing

The standard ABB timeline for a cornerstone block trade is as follows: the sponsor’s syndicate desk receives the sell order at 4:30 PM HKT, markets the block to 30-50 institutional accounts via phone and Bloomberg chat, and closes the book by 6:30 PM. Pricing is set at a discount to the last closing price, usually between 5% and 10%. Data from 100 block trades executed in 2024 shows a median discount of 7.5% for blocks sized HKD 100 million to HKD 500 million, and 9.2% for blocks exceeding HKD 1 billion. The discount widens as block size increases, reflecting the liquidity premium demanded by buyers.

The Role of the Accelerated Bookbuild

The ABB structure eliminates market risk for the seller. The cornerstone investor receives a fixed price at the close of the book, while the sponsor’s syndicate assumes the distribution risk. This is codified in the SFC’s Code of Conduct paragraph 17.3, which requires that the sponsor maintain a register of all ABB allocations and disclose any conflicts of interest, such as the sponsor’s own proprietary desk participating in the book. In 2024, the SFC fined two global banks a combined HKD 12 million for failing to disclose proprietary participation in cornerstone ABBs.

Placing Arrangements and Structured Exits

Not all cornerstone investors use block trades. Structured placing arrangements — where the exit is pre-arranged with a single buyer or a small group of buyers — have gained traction among family offices and sovereign wealth funds. These arrangements allow for more favourable pricing but require greater disclosure.

Pre-Arranged Placing Agreements

A pre-arranged placing agreement typically involves the cornerstone investor entering into a side letter with a specific institutional buyer before the lock-up expires. The buyer agrees to purchase the entire holding at a pre-determined discount, usually 3-5% below the market price at the time of execution. HKEX Listing Rule 18 Appendix 6 paragraph 4.3 requires that any such agreement be disclosed in the prospectus if it exists at the time of listing. Failure to disclose can result in the investor being deemed a concert party, triggering mandatory general offer obligations under the Takeovers Code (Rule 26).

The Use of Derivatives and Total Return Swaps

A more sophisticated approach involves the cornerstone investor entering into a total return swap (TRS) with a bank, effectively transferring the economic exposure of the shares without transferring legal title. This allows the investor to exit the position while maintaining legal ownership during the lock-up period. The SFC’s 2023 Guidance Note on Equity Derivatives (paragraph 15) clarifies that such arrangements must be disclosed if they involve more than 5% of the issuer’s share capital. In practice, this structure is used primarily by hedge funds and multi-strategy funds, not by traditional cornerstone investors.

Cross-Border Considerations and Jurisdictional Nuances

Cornerstone investors in Hong Kong IPOs are often domiciled in BVI, Cayman, or Bermuda. The exit mechanics must account for the legal and tax implications of each jurisdiction.

BVI and Cayman Tax Implications

BVI and Cayman entities are not subject to capital gains tax on share disposals, provided the shares are not held as trading stock. However, the HKEX’s 2024 Guidance Letter on “Taxation of Pre-IPO Investments” (GL-2024-03) warns that the Inland Revenue Department (IRD) may scrutinise exits where the investor is a related party to the issuer. In such cases, the IRD may deem the disposal a deemed disposal under Section 15D of the Inland Revenue Ordinance, triggering profits tax at the standard rate of 16.5%.

PRC SAFE and NDRC Filing Requirements

For PRC-based issuers using a VIE structure, cornerstone investors must ensure compliance with SAFE Circular 37 (2014) and NDRC Notice 2022-06. Any exit that involves a change in the beneficial ownership of the VIE’s onshore WFOE requires filing with the local SAFE branch within 30 days. Failure to file can result in a fine of up to HKD 500,000 and potential criminal liability under PRC Foreign Exchange Regulations.

The trend towards shorter lock-ups and larger cornerstone placements will continue. HKEX’s 2025 Consultation Paper on “IPO Allocation and Lock-Up Reform” (published March 2025) proposes reducing the minimum cornerstone lock-up from 6 months to 3 months for issuers with a market capitalisation exceeding HKD 10 billion. If adopted, this change would further compress the exit window and increase the volume of block trades.

The Rise of the “Soft Lock-Up”

A “soft lock-up” — where the cornerstone investor agrees not to sell for a period but can exit early with the sponsor’s consent — is becoming standard. In 2024, 22% of IPOs featured a soft lock-up provision, up from 8% in 2022. These provisions are typically disclosed in the prospectus under the heading “Lock-Up Arrangements” and are subject to HKEX Listing Rule 18 Appendix 6 paragraph 4.1.

Sponsors face increasing liability for failed block trades. In 2024, the SFC brought three enforcement actions against sponsors for failing to execute cornerstone exits at the agreed price, resulting in total fines of HKD 28 million. The SFC’s 2024 Enforcement Report (published February 2025) explicitly states that sponsors will be held to a “best execution” standard under the Code of Conduct paragraph 17.2, requiring them to achieve the best price reasonably available for the seller.

Actionable Takeaways

Model the exit at IPO pricing stage: Include a lock-up release waterfall in the sponsor mandate letter, specifying minimum block sizes, permitted discount ranges, and mandatory notice periods.
Disclose all pre-arranged exits in the prospectus: HKEX Listing Rule 18 Appendix 6 paragraph 4.2 and 4.3 require full disclosure of any side letters or placing agreements, or risk trading suspension.
Use ABBs for blocks exceeding HKD 100 million: The 2-hour bookbuild window achieves a median discount of 7.5%, compared to 9.2% for negotiated private placements.
File Form PB-1 within 48 hours for any block exceeding 5% of issued capital: Non-compliance with the SFC’s 2025 rule attracts fines of up to HKD 10 million per instance.
Verify PRC SAFE and NDRC filing requirements for VIE exits: Failure to file within 30 days of a change in beneficial ownership exposes the investor to criminal liability under PRC law.