What changes your chance of an IPO allotment
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The one formula
Everything below either changes one side of this division (more lots in a pool you can enter, more of your own applications in it) or stops an application from being counted at all. Nothing else is in the formula: not the time you applied, not the broker, not how many lots you asked for.
Why “50 times subscribed” isn't a 1 in 50 chance
A retail portion of 2,50,000 lots is 50 times subscribed: 1,25,00,000 lots bid for. How many applications that represents depends on the average bid.
| Average bid | Applications | Chance per application |
|---|---|---|
| 1 lot | 1,25,00,000 | 2% (1 in 50) |
| 2 lots | 62,50,000 | 4% (1 in 25) |
| 5 lots | 25,00,000 | 10% (1 in 10) |
The real application count is printed in the registrar's basis of allotment after the issue. During the issue, exchanges show category-wise bids, and some exchange issue pages also show the number of applications. Dividing lots by applications gives the chance directly.
Bid size in the retail lottery
Lots cost ₹14,000. Applicant A bids 1 lot; applicant B bids the retail maximum of 14 lots, ₹1,96,000. The book is oversubscribed, with a 1 in 8 chance per application.
| A: 1 lot | B: 14 lots | |
|---|---|---|
| Money blocked until T+2 | ₹14,000 | ₹1,96,000 |
| Chance of an allotment | 1 in 8 | 1 in 8 |
| Shares if allotted | 28 | 28 |
Bid size starts to matter only when the retail book has more lots than applicants. Then everyone gets one lot and the rest is shared in proportion to the extra lots bid, so a larger bid receives more. Which case an issue ends up in is known only after it closes.
Separate applications in a household
With p = 12.5%, the chance that none of three separate applications is picked is 0.875 × 0.875 × 0.875 = 67%. So the chance at least one is picked is about 33%. Each application blocks its own ₹14,000, from its own account.
The conditions are strict. The UPI ID or bank account must belong to the applicant: a parent's UPI used for a child's application is a name mismatch and is rejected. A second application under the same PAN, even through a different broker or bank, is a duplicate and is rejected. Rules for applications by minors vary by broker and registrar. A joint demat account is counted under the first holder's PAN.
Shareholder and employee quotas
- Shareholder quota. When a listed company takes a subsidiary public, it may reserve part of the issue for its own shareholders. Eligibility is fixed by a record date stated in the RHP (usually the date the RHP is filed), so shares bought after that date don't qualify. Rules on whether you can also bid in the retail category are set out in the RHP.
- Employee quota. For eligible employees, with a higher bid limit than retail and sometimes a discount to the issue price.
A shareholder pool of 30,000 lots draws 1,20,000 applications: 1 in 4. In the same issue, the retail pool is 1 in 8. A shareholder who is allowed to bid in both pools has two separate chances. These numbers are illustrative; real pools are sometimes more crowded than retail, because buying a parent's shares to qualify is widely discussed.
Buying shares of a listed company only to qualify for a quota means owning those shares, with their own price risk, for a pool whose odds are unknown until after it closes.
Bids between ₹2 and ₹10 lakh
Minimum NII application: 15 lots, ₹2,10,000. An sNII pool of 2,380 such units draws 30,000 applications, about 1 in 13. A ₹2,10,000 bid and a ₹9,94,000 bid (71 lots) have the same chance and win the same 15 lots. The larger bid only blocks more money, and NII bids can't be cut or withdrawn once placed.
Staying in the draw
| Check | Why it matters |
|---|---|
| Approve the UPI mandate the same day | An application is incomplete until the mandate is accepted; unapproved ones fall out at the cut-off on the closing day |
| Use a bank account or UPI ID in the applicant's own name | A mismatch with the PAN on the application is a rejection |
| One application per PAN per category | Duplicates are rejected, and can cost the original application too |
| Keep the full amount in the account until allotment | The block fails if the balance is short |
| Bid at cut-off (retail) | A price bid below the final price is not eligible |
| Check the retail limit at the top of the band | A bid above ₹2 lakh moves out of the retail category |
Things that don't change the odds
Applying early, or at a particular time of day
Every valid application received while the issue is open goes into the same draw. Early applications only give more time to fix a failed mandate.
Applying through a particular broker or bank
The registrar runs the lottery on the combined list of valid applications. Brokers and banks only pass them on.
Several applications from one person
Allotment is per PAN. Extra applications under the same PAN are duplicates and are rejected.
A big retail bid “to show seriousness”
The lottery ignores bid size once the book is oversubscribed. A winner gets one lot either way.
Grey market premium (GMP) or subscription tips
Informal, unregulated quotes. They don't enter the allotment process, can't be verified, and don't measure the listing price.
An allotment is not a return
Everything above is about the chance of receiving shares. It doesn't touch the price at which they list or trade afterwards, which can be below the issue price. Heavy oversubscription measures demand during a few days of bidding; it is not a forecast of where the price goes. The RHP's risk factors, the use of the money raised, and how much of the issue is existing shareholders selling are the parts of the document that describe the company itself.
Work out the odds
Enter the retail portion and lot size from the RHP, then either the number of applications (from the exchange or the basis of allotment) or the subscription multiple with a guess at the average bid. The starting values are the example issue from how IPO allotment works.
Reading “20 times subscribed” as a 1 in 20 chance (5.0%) would be wrong here: the multiple counts shares bid, and the average applicant bid for 2.5 lots, so there are fewer applicants than the multiple suggests.
Approximate. It assumes every application is valid and treats household applications as independent draws. Bids rejected for a PAN mismatch, an unapproved mandate or too little balance drop out before the lottery. Applications count only once per PAN. Rules as of October 2026; the issue's red herring prospectus and the registrar's basis of allotment are the exact source. The chance of a lot says nothing about how the shares trade after listing.
What changes the chance, and what doesn't
| Factor | Effect on the chance |
|---|---|
| Applications in the pool | The whole denominator: more applicants, lower chance |
| Lots in the pool | Set by the issue size, retail share and lot size |
| Separate PANs in a household | Independent entries, each with its own blocked amount |
| Eligible reservation (shareholder, employee) | A separate pool with its own odds |
| Valid application | The difference between some chance and none |
| Retail bid size, once oversubscribed | No effect |
| Time of applying, choice of broker | No effect |
Educational explanations only, not investment advice, research or a recommendation to buy, sell or hold any security. Past performance does not indicate future results. Every example uses made-up round numbers. Read the Disclaimer before relying on any figure.