Can you subscribe to a Hong Kong IPO with a few thousand Hong Kong dollars? If you have hundreds of thousands, is it better to apply for one lot or several? With a few million, should you move into Pool B or borrow to increase your application?

A practical approach is to start with a low-fee, cash-funded one-lot application. As your budget grows, compare how much additional stock a larger application might secure. Near the Pool B threshold, compare the top of Pool A with the bottom of Pool B. Assess borrowing separately to see whether the additional expected profit covers its cost.

We will first explain the allocation rules, then look at choices for different budgets. A worked example at the end compares applying for one lot, two lots or ten lots with financing when you have HK$10,000.

1. Hong Kong IPO subscriptions: how does application money become shares?

Subscribing to a Hong Kong IPO means applying to buy shares during a company's initial public offering. After applications close, the issuer allocates shares to valid applications according to the final allocation plan. Receiving shares is known as receiving an allotment.

Start with three terms:

Term	Meaning
One lot	A set number of shares, as specified in the IPO documents
Application amount	The value of the shares you apply to buy
Allotment amount	The value of the shares you actually receive

Applying for ten lots does not mean you will receive ten lots. You might receive one lot, several lots or none. Excess application money not used to buy shares is refunded or released under the offering and broker arrangements.

Consider this hypothetical example:

An IPO is priced at HK$20 per share, with 200 shares per lot. One lot costs HK$4,000, so applying for ten lots requires HK$40,000 in share money, plus fees.

If you receive only one lot, you buy HK$4,000 of shares and the remaining share money is returned under the applicable arrangements. Selling that lot later for HK$4,400 produces a HK$400 trading gain. Subscription, trading and any financing costs must then be deducted to find your net profit.

Before applying, calculate two amounts: how much money the application ties up, and how much you actually pay for the shares allotted.

2. What do you need to subscribe, and how much money is required?

Your account must support IPO subscriptions

To apply through a broker, your account must offer Hong Kong IPO subscriptions and you must meet the offering's eligibility requirements. Your identity, place of residence and offering restrictions can affect eligibility.

HKEX's IPO subscription guidance explains routes including applications through brokers or custodians using FINI, and White Form eIPO. This article focuses on the rules and funding decisions for public-offer applications made through a broker.

The minimum budget is one lot's share money plus fees

Calculate it as follows:

Share money for one lot = application price × shares per lot

Suppose the price range is HK$18–20 and each lot contains 200 shares. If the offering collects application money at the top of the range, prepare HK$4,000 plus fees. If the final price is lower, excess money is handled under the offering arrangements.

The cost of one lot varies between IPOs. To work out how many you can apply for with HK$10,000, add up the share money and fees for each offering.

Do not make duplicate applications through different accounts

Multiple applications by the same investor for the same Hong Kong public offer may be treated as duplicates and rejected, even when submitted through different brokers. HKEX's FAQ explains this restriction.

To apply for more shares, select the appropriate quantity within a single valid application.

3. How are shares allocated? Application tiers, pools and clawback

Your application quantity determines your allocation tier

An IPO typically offers a schedule of application quantities, such as 100, 200, 500 or 1,000 shares. Each permitted quantity is an application tier.

A two-lot application follows the rules for the two-lot tier. It is not split into two one-lot applications and does not also enter the one-lot tier's ballot.

Different tiers can have different allocation arrangements. A lower tier might use a ballot to select applicants who receive one lot. A higher tier might give every applicant one lot, with a further ballot for additional shares.

For example, FWD Group's 2025 allotment announcement set out the following results. One lot contained 100 shares:

Shares applied for	Allocation
100	3,591 of 17,952 applicants received 100 shares each
200	2,366 of 7,003 applicants received 100 shares each
900	Every applicant received 100 shares
1,000	Every applicant received 100 shares; 718 applicants received another 100 shares each

The chance of receiving shares was about 20% in the 100-share tier and about 33.79% in the 200-share tier. The latter is the complete result for that tier; the one-lot tier's chance is not added to it.

Within the same IPO, some one-lot applicants can receive nothing while larger applicants receive one lot for certain and a chance of another. There is no requirement to allot one lot to every applicant before allocating additional shares.

What is set in advance, and what is decided after applications close?

The pool thresholds and applicable clawback mechanism are governed by rules and offering documents. The number of successful applicants and shares allotted within each tier depends on the valid applications received.

Prospectuses generally explain that allocation may vary with application quantity and may involve balloting; see this example of an offering's allocation provisions.

Because the final allocation for each tier depends on valid applications received after subscriptions close, the optimal application tier cannot be calculated precisely in advance. You can compare choices using estimated allotments and actual costs.

Past allotments can inform those estimates, but they do not establish the outcome of the current IPO. Keep this distinction in mind when comparing the budget options and worked example below.

Allotment probability and allocation percentage measure different things

Allotment probability asks: what proportion of applicants receive shares?

Allocation percentage asks: what proportion of the shares applied for are allotted?

Suppose 100 people apply for two lots each. A ballot selects 40 people, who each receive one lot:

• 40 of 100 applicants receive shares, giving a 40% allotment probability.
• Applicants requested 200 lots in total and received 40 lots, giving a 20% allocation percentage.

A 20% figure in an announcement therefore does not necessarily mean only 20% of applicants received shares. Read the column heading and the stated basis of allocation or balloting together.

Pool A and Pool B are divided at HK$5 million

Under paragraph 3.1 of HKEX Main Board Practice Note 18, public subscription shares are generally divided into two pools:

Pool	Value of shares applied for
Pool A	HK$5 million or less
Pool B	More than HK$5 million

Each pool is generally assigned half of the public subscription shares. If one is undersubscribed, surplus shares can be transferred to the other.

The threshold concerns the value of shares applied for, not your total account assets or the cash margin you contribute when borrowing. Use the price basis and permitted quantities specified in the IPO's prospectus.

For example, permitted application tiers worth HK$4.8 million and HK$5.2 million would fall into Pool A and Pool B respectively.

The “top of Pool A” is generally its largest permitted application tier; the “bottom of Pool B” is its smallest. Comparing them matters because crossing the threshold moves your application into a different pool. Which offers better value still depends on each pool's demand and available shares.

Clawback determines the shares available for public subscription

An IPO may include both a public subscription tranche and a placing tranche. Clawback transfers shares from the placing tranche to the public tranche when specified conditions are met.

Under HKEX's allocation changes effective in August 2025, offerings subject to the relevant rules can use Mechanism A or Mechanism B.

Mechanism A starts with a 5% public subscription allocation, which increases when demand reaches specified thresholds.

Total public subscription demand as a multiple of the initial public allocation	Public subscription shares as a percentage of offer shares after adjustment
At least 15 times but below 50 times	15%
At least 50 times but below 100 times	25%
At least 100 times	35%

For an offering of 100 million shares, the initial public allocation would be 5 million shares. At the highest threshold, it would rise to 35 million shares.

Mechanism B sets the public subscription allocation in advance at between 10% and 60%, without the clawback mechanism above.

For the same 100-million-share offering, a 10% allocation under Mechanism B would provide 10 million public subscription shares. Strong demand alone does not mean you can apply Mechanism A's thresholds and expect that allocation to rise to 35 million.

These arrangements apply to new applicants publishing listing documents on or after 4 August 2025 that are subject to the relevant mechanisms. Specialist Technology Companies under Chapter 18C have different provisions, and individual offerings may receive waivers.

Clawback tells you how many shares are available for public subscription. Your own allotment also depends on applicant numbers, demand within each tier and the final allocation basis.

4. How do you calculate the costs of cash and financed applications?

Separate costs payable without an allotment from costs of receiving shares

Cost	What to check
Subscription handling fee	Whether it is charged, including when you receive no shares
Allotment and sale-related charges	Calculate using allotted share value, sale proceeds and the applicable fee schedule
Financing interest and related charges	Calculate using the loan amount, interest period and financing terms

Suppose a broker charges HK$20 per application regardless of the result. You still spend HK$20 if you receive no shares. If you receive and sell shares, that HK$20 and other applicable costs must be deducted from the trading gain.

On a HK$200 trading gain, paying HK$20 or HK$150 in fees makes a substantial difference to what you keep. Fixed fees deserve particular attention on small applications.

Calculate financing costs on the full borrowing

A financed application, often called a margin IPO subscription, uses borrowed money to apply for more shares.

Hafoo Securities' IPO subscription guide distinguishes interest arrangements for bank financing and financing secured by existing holdings, and notes that the relevant interest remains payable without an allotment.

Check how much you actually borrow during the subscription period, how many days attract interest and what other charges apply. A large application loan can incur interest even if you eventually receive very few shares.

After results are announced, if the allotted share money exceeds your own funds, establish how much you need to pay in and how any remaining borrowing accrues interest.

Compare the additional return with the additional cost

To compare two choices, calculate:

Expected net benefit of a larger application
= expected profit from additional shares allotted − additional fees − additional cost of tying up funds

If applying for more shares only raises your chance of an allotment, include that probability. If a tier provides a certain allotment plus a ballot for extra shares, calculate the certain and ballot portions separately.

Deduct allotment and sale-related charges when estimating profit per lot, then deduct subscription handling and financing costs separately. This avoids omissions and double counting.

The worked example in section six puts the calculation together.

5. How should you choose an application size for your budget?

Start with a low-cost cash application, then compare larger quantities. At each step, ask: how much additional expected profit does the extra money buy?

Enough for one lot or a small application: start with one lot in cash

With a budget of a few thousand to tens of thousands of Hong Kong dollars, focus on one lot's cost, fixed fees and when you can reuse the money.

Start by comparing a low-fee, cash-funded one-lot application. For an IPO you have decided to participate in, calculate the cash required, the cost of receiving no shares and the gain needed on an allotment to cover fees.

If your budget permits, compare smaller multiple-lot tiers next. Without extra fees or financing interest, the main question is whether the improved allotment chance justifies tying up more cash.

If you plan to apply for several IPOs, also compare one lot in each with a larger application in a single IPO. Expected net profit and overlapping funding periods will affect the choice.

Enough for a larger Pool A application: compare tiers rather than use every dollar

With hundreds of thousands or a few million Hong Kong dollars available, compare one lot, an intermediate tier and a higher tier within budget.

For example, with HK$300,000, you could identify permitted tiers with share money of around HK$4,000, HK$40,000 and HK$200,000. Estimate the allotment, costs and funding period for each.

If raising the application from HK$40,000 to HK$200,000 is expected to secure only a few more shares, consider whether keeping the extra HK$160,000 for other IPOs could produce a better result.

Within Pool A, choose a tier where the additional commitment is still worthwhile. An unused account balance does not itself make a larger application better value.

Near the Pool B threshold: compare the top of Pool A with the bottom of Pool B

Identify the IPO's largest Pool A tier and smallest Pool B tier. Calculate the difference in application value, then estimate how many more shares Pool B might provide.

If borrowing is needed to enter Pool B, include all interest and related fees in that choice.

Suppose borrowing to cross the threshold costs an additional HK$2,000. Compared with the top of Pool A, you expect two extra lots, each producing HK$600 in net profit:

Expected additional profit = 2 × HK$600 = HK$1,200
After additional costs = HK$1,200 − HK$2,000 = −HK$800

Under those assumptions, borrowing to enter Pool B does not pay.

If the information is insufficient to estimate Pool B's allocation, use the cash application as your starting point. The label “bottom of Pool B” alone does not establish an advantage.

Enough for Pool B: compare its smallest tier with larger applications

Once you can fund a Pool B application in cash, compare the top of Pool A, the bottom of Pool B and larger Pool B tiers.

The smallest Pool B tier enters that pool with its minimum permitted quantity. For a larger application, recalculate how much additional stock the extra cash is expected to secure.

Choose a quantity with an attractive expected net profit that you would also be willing to take if allotted.

For example, if you expect HK$100,000 of shares, also calculate what happens if you receive HK$300,000 or HK$500,000: how much extra share money would be needed, and how much could that holding lose if the price fell?

This keeps your application size consistent with the amount of stock you are willing to hold.

6. A HK$10,000 budget: a worked comparison

Now bring the allocation rules and costs together for one application.

Suppose you have HK$10,000 available for share money, with fees reserved separately. Assume the following IPO terms:

Item	Hypothetical terms
Offer price	HK$20 per share
Shares per lot	200
Share money for one lot	HK$4,000
Subscription handling fee	HK$20 per application, whether or not shares are allotted
Expected profit from receiving and selling one lot	HK$360 after allotment and sale-related charges, before subscription handling and financing costs

Compare three choices:

• One lot in cash: ties up HK$4,000.
• Two lots in cash: ties up HK$8,000.
• Ten lots with financing: requires HK$40,000 in share money, funded by HK$10,000 of your own cash and a HK$30,000 loan.

Estimate what each tier might receive

For this calculation, assume the following:

Choice	Assumed allotment probability	Shares received if successful
One lot in cash	20%	One lot
Two lots in cash	34%	One lot
Ten lots with financing	60%	One lot

These probabilities are hypothetical inputs for the example, not a pattern that real IPOs must follow. For an actual application, use the offering information and demand to form estimates; the allotment announcement establishes the final outcome.

Each choice follows its own application tier. The 34% probability for two lots is already the full chance of success; it is not added to the one-lot tier's 20%.

Add financing costs

Assume the loan carries 4% annual interest on a 365-day basis, runs for 5 days and has a separate HK$100 financing fee:

Interest = HK$30,000 × 4% × 5 ÷ 365 ≈ HK$16.44

The fixed costs are:

Choice	Subscription handling fee	Financing fee and interest	Total
One lot in cash	HK$20	0	HK$20
Two lots in cash	HK$20	0	HK$20
Ten lots with financing	HK$20	HK$116.44	HK$136.44

Assume these charges are payable whether or not you receive shares, with no other additional costs.

Compare expected net profit

For each choice, calculate:

Expected net profit = allotment probability × expected profit from receiving and selling one lot − fixed costs

Substituting the figures:

Choice	Calculation	Expected net profit
One lot in cash	20% × HK$360 − HK$20	HK$52
Two lots in cash	34% × HK$360 − HK$20	HK$102.40
Ten lots with financing	60% × HK$360 − HK$136.44	HK$79.56

Under these assumptions, applying for two lots in cash has the highest expected net profit. Financing ten lots gives a better chance of receiving shares, but the additional return does not cover the additional costs.

Two lots tie up HK$4,000 more than one lot and add HK$50.40 in expected net profit. If that extra cash has no better use over the same period, two lots may be worth considering. If you need it for another IPO with a better expected return, compare the two applications together.

Check the outcomes with and without an allotment

An expected net profit of HK$102.40 does not mean you will earn HK$102.40 on this application.

Under the example's assumptions:

Choice	No allotment	Allotted and sold at the assumed price
One lot in cash	HK$20 loss	HK$340 profit
Two lots in cash	HK$20 loss	HK$340 profit
Ten lots with financing	HK$136.44 loss	HK$223.56 profit

In this example, applying for one or two lots in cash produces the same profit if successful. The differences are the chance of success and the cash tied up.

Expected net profit weights the outcomes with and without an allotment by their probabilities so that you can compare choices. Your actual result still depends on whether you receive shares and the eventual sale price.

For your own application, substitute the cost of one lot, estimated allotments by tier, broker charges and borrowing terms. You can then judge whether the additional expected profit from a larger application justifies its cost.