You did everything right. Filled the application before the deadline, blocked the full ₹2 lakh, approved the UPI mandate the second it landed. Then allotment day came, you opened the registrar's site, typed in your PAN, and it said "Not Allotted." No error, no explanation. Just nothing.
Your first instinct is to look for what you did wrong. There's a good chance you didn't do anything wrong at all.
So It Wasn't Something You Did
Key takeaway
When an IPO's retail category gets more applications than it has shares for, SEBI's process runs a computerised lottery. Winners are picked at random. Applying for more lots or more money doesn't buy you a better shot at winning.
For a popular IPO, retail allotment mostly isn't a skill problem or a mistake-you-made problem. It's a lottery. A regulated, fully automated one, but a lottery all the same. Whether you get shares or not usually comes down to whether your application number gets pulled, not whether you were fast, careful, or applied for a bigger amount.
Wait, Isn't It First-Come-First-Served?
That's the assumption almost everyone carries in from every other queue in life: whoever showed up first, or bid the most, wins. IPO allotment flips that.
Here's the actual mechanism. Every retail application is capped at ₹2 lakh at the time of writing (SEBI revises this occasionally, so check the current figure before applying). Anything above that moves you into the NII (non-institutional investor) category, with different rules entirely. Within the retail pool, if the number of applications is small enough that everyone can get what they asked for, everyone does: no drama, no lottery, allotment simply matches demand. That happens for IPOs nobody's particularly excited about.
The moment retail demand crosses what's actually available, the registrar runs a computerised draw, and this is the part that trips people up: each valid application gets exactly one entry into that draw, no matter how many lots it asked for. A person who applied for a single lot and a person who maxed out their ₹2 lakh applying for a dozen lots go into the same draw with the exact same odds. Winning gets you exactly one lot, and the extra lots you asked for simply don't come into it.
The retail pool itself is also smaller than the headline IPO size suggests, because a chunk of the issue is typically set aside for anchor investors and other institutional buyers before the public even gets a turn. That's part of why a "small" oversubscription number can still feel brutal: the pie was never the whole pie to begin with.
Let's See It Play Out
Priya moved back to India last year after eight years in the US. Out there, getting IPO shares before listing was mostly a broker-relationship thing, and retail investors rarely got a real shot. In India, she was told, anyone with a demat account can apply. That sounded like better odds, so she went in with the full amount.
Say a mid-sized IPO sets aside 10 lakh shares for the retail category, with a lot size of 30 shares at ₹480 apiece, so one lot costs ₹14,400 and the full ₹2 lakh limit buys roughly 13 lots. The issue turns out to be popular: retail alone pulls in 40 lakh valid applications chasing those 10 lakh shares, subscribed about four times over in that category.
There's no way to give all 40 lakh applicants even one lot each, so it goes to the draw. Roughly 1 in 4 applications gets picked. Priya applied for all 13 lots; her friend Arjun applied for just 1. They have identical odds of being picked, because the draw doesn't know or care how many lots either of them asked for. It only knows they each submitted one valid application. If Priya's number comes up, she gets exactly 1 lot credited to her demat account, the same as Arjun would. The other 12 lots she paid for simply come back to her as a refund.
What People Get Wrong About IPO Allotment
Applying for more lots or the full ₹2 lakh improves your odds of getting shares.
One valid application is one lottery entry, whether it's for 1 lot or the maximum. More money in doesn't mean better odds.
Applying the moment the IPO opens gives you an edge in the draw.
The draw runs only after the window closes, using final numbers. Applying early just protects you from a rejected application near the deadline, not from bad luck in the lottery itself.
If you keep applying to every IPO, your odds improve over time.
Each IPO's draw is independent. A first-time applicant and someone who's applied to fifty IPOs before have the same odds on any single one.
None of this means the retail category is being shortchanged deliberately. It's SEBI's way of giving small investors a fair, tamper-proof shot at hot issues instead of letting allotment quietly favor whoever has the best broker relationship. Here, "fair" works like a raffle: every entry gets an equal shot, regardless of how much you put in or how fast you clicked submit.
Where to Go From Here
Missing out on allotment is usually where people start eyeing the grey market premium number everyone's quoting, wondering if buying on listing day is the next best thing. That number is worth understanding properly before you act on it. It isn't regulated, and it doesn't always predict what actually happens at listing.