How to Participate in a Hong Kong IPO — Allocation, Results, and Grey Market Explained

For investors new to Hong Kong IPOs, the terminology can be daunting: what is a prospectus, when can you subscribe, what are Pool A and Pool B, when do allocated shares arrive in your account, and what is the grey market?

In practice, a Hong Kong IPO follows a relatively clear sequence from the subscription period to official listing. This article walks through each of the seven key milestones:

Prospectus published → Public subscription → Subscription closes → Pricing → Allocation results → Conditional trading (grey market) → Official listing

An IPO (Initial Public Offering) is when a company first issues shares to the public and lists on a stock exchange.

Participating in an IPO subscription does not guarantee an allocation, and an allocation does not guarantee the stock will rise after listing. Both the final allocation and post-listing price performance involve inherent uncertainty.

When a company prepares to list, it publishes a prospectus. This is an important resource for investors, typically covering:

• Core business and commercial model

• Industry overview and competitive landscape

• Historical financial performance

• Shareholder structure

• Use of proceeds

• Number of shares being offered

• Indicative price range

• Cornerstone investors

• Risk factors

The prospectus is more than an administrative document — it is an important source of analytical material. When researching a new IPO, three useful starting questions are: how does the company generate revenue, what has its growth looked like historically, and what does it intend to do with the IPO proceeds?

Once the subscription period opens, eligible investors may apply under the public offering tranche. This is what is commonly referred to as "subscribing for Hong Kong IPO shares".

An important distinction: applying for shares in the public offering does not mean you will receive them. If a new share receives significant investor interest, the public offering tranche may be substantially oversubscribed. In that case, the final allocation to each investor is determined by the applicable allocation mechanism. This is why terms such as "oversubscription multiple", "allocation rate", and "clawback mechanism" are common in Hong Kong IPO discussions.

When participating in a Hong Kong IPO, investors may have a choice of subscription method. BIT supports both cash and margin subscriptions:

* Margin subscriptions involve borrowing and additional costs, including interest. The use of margin can increase investment exposure and may amplify losses. Applicable margin terms, interest rates, fees and risks should be reviewed before subscribing.

The public subscription period has a defined opening and closing date and time. After the deadline, new public subscription applications generally cannot be submitted.

Key milestones to track:

Always refer to the relevant company announcements and the latest information shown in the BIT interface for each specific IPO.

During the subscription period, the company publishes an indicative price range — for example, HKD 20 to HKD 25. The final offer price is generally determined within that range based on market demand.

Investors may find it useful to consider: where does the final price land within the range? And, more importantly: what company valuation does that price imply?

A share with an offer price of HKD 20 is not necessarily cheaper than one priced at HKD 100. What matters is the implied market capitalisation — which depends on the total number of shares outstanding. Focus on valuation, not the absolute price level.

Once pricing is finalised, the company publishes the allocation results. This is one of the most important checkpoints for investors who participated in the public subscription:

• Final offer price

• Public tranche subscription level

• Clawback arrangements

• Final allocation results

• Shares allocated per lot

• Individual allocation outcome

If allocated shares: they will be credited to your BIT securities account in accordance with the relevant settlement arrangements.

If not allocated: the corresponding funds will be returned in accordance with the applicable rules.

Public offering investors are typically grouped into different pools based on the size of their application and other applicable rules.

• Pool A: generally corresponds to smaller subscription applications.

• Pool B: generally corresponds to larger subscription applications.

A common misconception: subscribing for more shares does not proportionally guarantee a larger allocation. The allocation process follows the applicable distribution mechanism, and in oversubscribed situations, the number of shares actually allocated may differ significantly from the number applied for. Always refer to each IPO's prospectus for the specific allocation rules.

This measures total investor demand relative to the number of shares available in the public tranche. For example: if 1,000,000 shares are offered publicly but investors apply for 10,000,000 shares in total, the oversubscription multiple is 10x.

The allocation rate reflects the probability or proportion of applications that are successful, which depends on the specific allocation mechanism, application size, and pool. A high oversubscription multiple does not mean every investor has the same allocation rate. Final allocation outcomes should be verified from the company's published allocation results.

When the public offering tranche is significantly oversubscribed, a portion of shares originally allocated to the international placement tranche may be transferred ("clawed back") to the public offering tranche under the applicable rules, increasing the shares available to retail investors.

Conditional trading in Hong Kong new shares generally takes place on the last trading day before the official listing, between 4:15 PM and 6:30 PM. It provides a window into market pricing sentiment ahead of the official listing date.

For example: if the offer price is HKD 50 and the grey market price is HKD 55, this indicates that conditional trades are being executed above the offer price. Conversely, a grey market price below the offer price indicates trading below the offer level.

Conditional trading prices are not the same as official listing prices. After the official listing, shares trade on the open HKEX market and prices continue to evolve. The grey market is best understood as a pre-listing sentiment indicator — not a predictor of first-day performance.

On the listing date, the new shares commence trading on HKEX. The IPO phase ends, and the stock enters the secondary market, where prices are determined by open market supply and demand.

Risk Disclosure

This article is intended for general market knowledge purposes only. It does not constitute investment advice. Hong Kong equity and IPO investments involve risk. Stock prices may rise or fall, and investors may lose part or all of their invested capital. Specific IPO offering arrangements, subscription rules, allocation mechanisms, and timelines are subject to each company's official announcements and the latest information from HKEX and your broker. BIT’s equity trading services are not available to Hong Kong residents or users in other restricted jurisdictions.