QIB, NII and Retail are the three investor categories SEBI uses to split every Indian mainboard IPO. QIBs are institutions like mutual funds and FIIs, NIIs are HNIs and corporates bidding above two lakh rupees, and Retail is individuals bidding two lakh or less. Each bucket gets a guaranteed slice of the issue, so retail never has to compete head-on with an institution.
Most first-time IPO applicants do not realise these three buckets even exist. You open the IPO page on Zerodha, see a single subscription number ticking up, and assume the whole market is fighting for the same lots.
It is not. There are three separate queues, each with its own rules and its own slice of the cake. Knowing which queue you stand in, and what the other two queues are doing, is the difference between applying with information and applying on instinct.
If you have missed this so far, that is not a failing on your part. The broker app squeezes three separate queues into one number on one screen — so almost every beginner misses the category logic underneath. Let us pull the three apart.
The honest answerWhat QIB, NII and Retail actually mean
SEBI created the three-bucket system in 2005 to stop institutions from crowding retail out of every hot IPO. Before that, an oversubscribed issue could be dominated entirely by the biggest cheques in the room. The split fixes that, by law.
QIB stands for Qualified Institutional Buyer. The bucket holds mutual funds, insurance companies, pension funds, banks, foreign portfolio investors, and a few other SEBI-registered institutions. These are buyers with analyst teams and risk committees.
NII stands for Non-Institutional Investor. This bucket holds high net-worth individuals, corporates, partnership firms, trusts and family offices that apply for amounts above two lakh rupees. Older SEBI circulars still call it the HNI category.
Retail is for individual Indian investors applying up to two lakh rupees in a single PAN. This is the bucket every Zerodha or Groww user defaults into when they tap apply on an IPO.
Short answer. SEBI splits every profitable mainboard IPO into three reserved buckets: at least 50% for QIB, 15% for NII, and at least 35% for Retail. Each category competes only against itself, with its own allotment method. For loss-making companies coming under book-building, the split flips to 75-15-10 in favour of QIB.
The 50-15-35 split, line by line
For a profitable Indian mainboard IPO, SEBI Regulation 32 of the ICDR rules sets the reservation in stone. Every issue has to honour these category floors before a single share is allotted.
How a mainboard IPO is divided
The standard SEBI book-building split for a profitable company. Each bar shows the minimum reservation of total shares offered.
Inside each bucket, the allotment rules are different. QIB allotment is discretionary, decided by the merchant bankers in consultation with the issuer. NII is purely proportional, by bid size. Retail uses a lottery, with a guaranteed one-lot rule for at least some bidders if the bucket is oversubscribed.
The NII slice is itself split. One-third goes to NII Small, the sub-category for bids between two and ten lakh. Two-thirds goes to NII Big, for bids above ten lakh. SEBI introduced this two-bucket NII structure in 2022, so that smaller HNIs get a fairer shot against big-ticket bidders.
If the company has not turned a profit, the split changes. SEBI flips it to 75-15-10 in favour of QIB. The logic is simple — only institutions have the modelling teams to price an unprofitable business, so they should be doing the heavy lifting on valuation.
The frameworkRetail versus NII: same issue, different odds
For an individual investor, the choice between staying in Retail and crossing into NII looks like a question of how much to bid. It is not. It is a question of how allotment works inside each bucket.
In Retail, every bidder is treated equally. If the bucket is twenty times oversubscribed, SEBI's one-lot rule kicks in. A lottery picks who gets allotted, but every winner gets exactly one lot. Nobody gets six lots while you get zero.
In NII, every rupee competes. If you bid three lakh and the NII bucket is fifteen times oversubscribed, you get shares worth one-fifteenth of three lakh, regardless of who else is in the queue. NII rewards size; Retail rewards luck.
Up to ₹2 lakh
Bid is two lakh or less. SEBI's lottery decides who gets allotted, but every winner gets the same one lot regardless of bid size. Small applicants compete on equal footing with bigger retail bids.
Above ₹2 lakh
Bid is above two lakh. Allotment is strictly proportional to bid size. Bigger bids get bigger allocations. A 15x oversubscribed NII bucket gives you one-fifteenth of what you asked for, win or lose.
For most retail investors with normal capital, the math actually favours staying inside the two-lakh ceiling. A 50,000-rupee bid in Retail at one lot can outperform a three-lakh bid in NII when oversubscription is heavy, because the lottery floor protects you and proportional thinning does not.
Knowing how each category is bidding while the issue is still open is what tells you whether QIB has made up its mind or is still on the fence. The total subscription line you see on the broker app hides all of this.
Market Pulse tracks every open IPO's subscription by category in real time — QIB, NII Small, NII Big and Retail, separated and updated through the bidding window. Watching the three curves build over three days tells you more about an issue than any GMP screenshot. Read the demand by bucket before you decide which one to apply in.
Reading the subscription numbers as they build
Every NSE and BSE IPO page shows the live subscription number, broken down by category and updated every few minutes through the bidding window. The shape of those numbers tells you more than the total.
Day one matters less than you think. Most QIB demand lands in the last two hours of the last day. Foreign and domestic mutual funds wait to see retail and NII numbers before they commit. A day-one QIB number close to zero is not a red flag.
Anchor allocations show up before day one. The day before public bidding opens, the merchant bankers allocate up to 60% of the QIB slice to anchor investors at the cut-off price. That allocation is reported separately, with names and crore amounts. It is the first real institutional signal an IPO produces.
Retail numbers move fastest at the start. The Zerodha and Groww apps surge with first-day demand, because retail bidders tend to apply early and not look back. NII demand often spikes only on the last day, when HNIs have seen the QIB direction and decided whether the proportional bid is worth the size.
QIB by close of day three is the headline. By the close of the last day, the QIB number tells you whether the smart institutional money has decided this IPO is reasonably priced. A 30x oversubscribed QIB is a strong vote of confidence. A 1.2x QIB is a polite institutional shrug.
The reality checkWhat retail investors get wrong about the categories
Most retail confusion about QIB, NII and Retail comes from one mistake — confusing total subscription with category subscription, or from misreading what each number actually means.
Total subscription is the least useful number. An IPO can be 50x subscribed overall on the strength of a 200x NII bid alone, while QIB is only 1.5x. That is a market full of HNIs chasing the listing pop, not a market full of institutions endorsing the price.
GMP is not a category signal. Grey market premium reflects retail and HNI appetite, not institutional appetite. A high GMP with low QIB demand is an information asymmetry, not a buy signal.
Retail oversubscription does not always mean allotment is harder. SEBI's one-lot rule protects small bidders. If Retail is ten times oversubscribed, roughly one in ten lottery applicants still gets one lot. The math is built for participation, not for outsized retail bids.
Crossing into NII is not automatically a better strategy. NII is a proportional bucket. The bigger the bid, the bigger the absolute allotment — but also the bigger the cost of carrying a seven-day block on serious capital for a possible five-percent listing-day gain.
QIB is the verdict, NII is the leverage, Retail is the lottery. Each tells you something different. Read all three before you approve the mandate.
— On the three subscription numbers retail tends to merge into oneThe honest take
The three buckets exist because SEBI did not want a Reliance Power moment again — institutions crowding retail out of every hot IPO, then leaving the lottery applicants holding the bag on listing day. The 50-15-35 split is one of the more thoughtful pieces of Indian market plumbing, and it is sitting right there on every NSE and BSE IPO page, broken down by category.
The work, for a retail investor, is just to read all three numbers instead of one. QIB is the verdict on price, NII is the size of the leverage trade, Retail is whether the lottery floor is in your favour. Each one tells a different story about whether the IPO is worth a week-long block of your money.
Three queues. One issue. The category you stand in decides almost everything about your outcome.
Other tools for reading an IPO before you apply
Read the QIB number before the GMP, and other habits we teach
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