How HK IPO Allotment Works: Lot Size, Success Rate and Ballot Rules

IPO allotment is simply the distribution of IPO shares to investors who submitted valid applications. In Hong Kong, regular investors like us usually apply for Hong Kong Offer Shares through a bank, broker, custodian, or White Form eIPO.

After the application period ends, the company, sponsor, underwriters, and share registrar sort through the applications. HKEX explains that the allotment basis depends on valid applications. The share registrar normally screens out multiple, incomplete, or wrongly completed applications first. Then shares are allotted according to the basis of allocation decided by the sponsor and the newly listed company. (HKEX)

In plain English, allotment answers one question: you asked for shares, but how many did you actually get?

A board lot is the minimum trading unit for a Hong Kong stock. One IPO may trade in lots of 100 shares; another may use 200, 500, 1,000, or something else. This matters because most small players don’t think in single shares. We think in lots.

For example, if an IPO is priced at HK$10 and one board lot is 500 shares, the rough one-lot cost is HK$5,000 before fees. Add brokerage, levies, and other charges, and that becomes your real entry amount.

Before applying, don’t just look at the brand name. Check these basics in the prospectus:

• Offer price range
• Board lot size
• Minimum application amount
• Application fees and charges
• Expected allotment result date

The one-lot success rate tells you the chance of receiving at least one lot if you applied for one lot. Say 100,000 people applied for one lot and 20,000 got one lot. The one-lot success rate is 20%.

This number matters because many mum-and-dad investors apply for one lot only, especially when the entry amount is high or when they’re still testing the IPO market. A high one-lot success rate means small applicants had a decent chance. A low one means the IPO was crowded and many one-lot applicants walked away empty-handed.

Frankly, don’t confuse this with investment quality. A low one-lot success rate can show hype, but hype doesn’t pay your bills if the stock opens below the offer price.

In Hong Kong IPO talk, people often say “ballot” or “抽籤”. Strictly speaking, it refers to the allocation process when there are more valid applications than available public offer shares.

If there aren’t enough shares for everyone, the issuer can’t just give every applicant the full amount requested. It uses an allocation basis. Some applicants get one lot, some get more, and some get nothing.

The exact result is shown in the allotment announcement. This is why I always read the allotment table, not just the headline saying the IPO was “100 times oversubscribed”. The headline is good for excitement. The table tells you what actually happened.

The basis of allocation is the table or formula showing how many shares applicants receive at each application level.

For example, one IPO may try to give one lot to as many small applicants as possible. Another may favour larger applications more. Some tables show a ballot percentage for one-lot applicants, while larger application tiers may receive a fixed number of shares plus a percentage of the remaining applied shares.

There’s no single universal Hong Kong IPO formula. Every deal can be different, so don’t assume last month’s allocation pattern will repeat in the next IPO. HKEX says investors can search IPO allotment results on HKEXnews, ask the relevant share registrar, or check the issuer’s website if results are published there. (HKEX)

An IPO is oversubscribed when investors apply for more shares than are available in the public offer. If the public offer has 10 million shares and investors apply for 1 billion shares, that’s 100 times oversubscribed.

Oversubscription usually tells you the deal is hot. But the thing is, it also tells you the allocation will be competitive. You may apply for many lots and still get very little. If you used IPO margin financing, you may still pay interest even when your final allocation is tiny.

In my experience, many beginners only look at the subscription multiple and forget the other side of the trade. If everyone gets very few shares, yes, scarcity can help sentiment. But if the valuation is stretched or the market mood turns, the stock can still fall on listing day.

Most Hong Kong IPOs are split into the Hong Kong Public Offer and the placing or international offering. The public offer is where normal investors usually apply. The placing tranche is mainly for institutional and professional investors.

This matters because the number of shares available to retail applicants is not the full IPO size. It’s only the public offer portion, plus any extra shares moved across if the IPO structure allows it. So when you see a big IPO headline, don’t assume all those shares are available to small investors like us.

The prospectus section usually called “Structure of the Global Offering” is worth reading. It tells you the initial public offer size, whether there is a clawback mechanism, and how the public tranche may change if demand is strong.

Clawback means more shares may be shifted from the placing tranche to the public subscription tranche when public demand is strong. This gives retail investors a bigger pool, but it still doesn’t guarantee that everyone gets shares.

Under HKEX’s updated IPO framework effective from 4 August 2025, issuers can use different public subscription allocation mechanisms. Under Mechanism A, the public tranche starts at 5% and can increase to 15%, 25%, or 35% depending on the level of public demand. Under Mechanism B, the public tranche has a minimum initial allocation of 10%, no clawback mechanism, and the maximum possible initial public allocation can be up to 60%. (HKEX)

The practical point is this: don’t rely on old rules of thumb like “public offer is always 10%”. That’s too lazy now. Check which mechanism the IPO uses. It can affect your allotment chance more than you think.

You can apply for a larger amount in one valid application, but you cannot submit multiple applications under the same name. IFEC states that investors can only submit one application under their name, including joint applications, and duplicate applications will be rejected. (IFEC)

So don’t apply through three brokers, don’t apply once with cash and once with margin, and don’t use both White Form eIPO and a broker for the same IPO. That isn’t clever. It may simply make your application invalid.

If you want to apply for more, adjust the amount in one application. Then ask yourself the uncomfortable question: if I get everything I applied for, can I still sleep at night?

When the allotment result comes out, don’t just look for your own allocation and close the page. The announcement gives you useful clues about demand and market mood.

Check the final offer price. Was it fixed at the top, middle, or bottom of the price range? Check the public subscription multiple. Was the public offer only lightly subscribed, or was it massively oversubscribed? Check the one-lot success rate. Did small applicants get a fair chance? Check the allocation table. How much did each application tier actually receive? Finally, check whether clawback was triggered and whether the public offer share count increased.

If grey market information is available, you can use it as one extra reference, but don’t worship it. Grey market performance can change quickly, especially when overall market sentiment is weak.

Before you apply, check the board lot size, one-lot entry amount, public offer size, allocation mechanism, and deadline. After the result, check the final price, subscription multiple, one-lot success rate, allocation table, and any clawback adjustment.

Most importantly, apply only for an amount you’re willing to receive in full. People love to say, “Don’t worry, it’ll be oversubscribed.” But if it isn’t, you may end up holding far more shares than you expected.

HK IPO allotment is the process that decides how many shares each valid applicant receives. The key ideas are board lot size, valid applications, one-lot success rate, ballot, basis of allocation, oversubscription, and clawback.

For beginners, the safest approach is boring but effective: submit one valid application, apply only for an amount you can accept in full, and read the allotment result properly.

A high subscription multiple may show strong demand. A low one-lot success rate may show intense competition. But neither one guarantees profit. Allotment tells you how many shares you got. It doesn’t tell you what the market will pay for them on listing day.