Introduction

In late 2025, The Stock Exchange of Hong Kong Limited (“HKEx”) published a consultation paper setting out proposals relating to an overhaul of the board lot framework for the Hong Kong securities market. HKEx’s proposals were presented following the HKSAR Government’s Task Force on Enhancing Stock Market Liquidity, and are intended to address operational complexities associated with the current issuer-led system, which has resulted in more than 40 different board lot units. The consultation period closed on 12 March 2026, and HKEx indicated that its conclusions are expected by the end of the first half of 2026. The consultation sets out a framework comprising three core components:

1.      standardisation of board lot units;

2.      revised guidance on a board lot value floor; and

3.      introduction of guidance on a board lot value ceiling. For boards and senior management of listed issuers, familiarising themselves with the consultation proposals may be important for understanding potential implications for share structure planning.

Standardisation of board lot units

A central element of the consultation is HKEx’s proposal to move away from the current system of over 40 board lot units towards a simplified set of eight standardised units. HKEx proposes that issuers select their board lot unit from the following options: 1, 50, 100, 500, 1,000, 2,000, 5,000 and 10,000 shares.

HKEx indicates that the standardisation is intended to reduce operational complexity across trading, clearing and settlement. By limiting the number of available units, the proposals are expected to reduce the risk of input errors and improve consistency in trading and hedging strategies, including alignment with related products such as derivatives.

HKEx also indicates that, based on its assessment, approximately 25% of issuers may need to change their existing board lot units. HKEx considers the approach to be balanced, aiming to deliver meaningful operational improvement while seeking to minimise undue market disruption. The consultation further notes that a potential future transition towards a more unified single board lot unit may be considered, subject to market conditions.

Revised board lot value floor guidance

The consultation paper addresses the risk of “negative value trades”, where transaction costs could exceed the trade value. HKEx’s current board lot guidance suggests that the board lot value should not be less than HK$2,000.

Recognising that fixed execution costs have decreased over the past decade, HKEx proposes lowering the floor guidance from HK$2,000 to HK$1,000. HKEx clarifies that this revision is intended to enhance market accessibility for investors while continuing to safeguard against negative-value trades when board lot units are initially set or adjusted.

HKEx indicates that the guidance would apply at listing, when issuers change board lot units, and when corporate actions such as share consolidations or sub-divisions are undertaken. HKEx also indicates that a fall in share price alone would not, by itself, trigger a requirement to act.

Introduction of board lot value ceiling guidance

HKEx proposes, for the first time, introducing guidance on a maximum board lot value set at HK$50,000. The consultation notes that some securities may have increased in market price over time while their board lot units remain unchanged, which may lead to very high board lot values and could act as a barrier to retail investor participation.

HKEx indicates that the proposed ceiling is intended to encourage issuers to adjust their board lot units downwards when the resulting board lot value becomes prohibitively expensive, thereby supporting broader retail participation and reducing concentration risk for investors. Importantly, HKEx proposes that the ceiling guidance would not apply to issuers using a board lot unit of 100 shares or less, even if their board lot value exceeds HK$50,000, to facilitate potential future alignment with a 100-share unit that is commonly used in Mainland China markets.

Implementation and key dates

HKEx proposes a phased implementation approach, aligning the changes with the Uncertificated Securities Market (“USM”) initiative, with the aim of maximising efficiency and minimising disruption – particularly by avoiding the need to reprint share certificates.

·           Phase One: HKEx proposes that new issuers would comply with all three components upon listing. For existing issuers, HKEx proposes that they would comply with the updated floor guidance (HK$1,000) and the new ceiling guidance (HK$50,000) within a specified period.

·           Phase Two: HKEx proposes that each existing issuer would adopt one of the eight standardised board lot units within a specified period following its transition to uncertificated shareholding under the USM.

As noted above, the consultation period closed on 12 March 2026, and HKEx indicated that conclusions are expected by the end of the first half of 2026. Issuers potentially affected by the proposals were encouraged to begin internal assessments.

Takeaways

Overall, the proposed enhancements to the board lot framework are presented by HKEx as a deliberate and measured step towards modernising Hong Kong’s market structure. By balancing the long-term objective of simplifying board lot arrangements with the practical realities of a market characterised by a wide range of stock prices, HKEx’s proposals aim to improve operational efficiency and support retail accessibility, while seeking to minimise disruption that could arise from an immediate move to a single unified board lot unit. For listed companies, the consultation indicates a direction towards greater standardisation. Directors may wish to familiarise themselves with the proposed framework and the phased implementation timeline. Strategic consideration of how the proposals may affect the company’s shareholder base and trading dynamics may be important for smooth compliance and for optimising share structure planning for the future.