A mainboard IPO is not one queue. It is several books with different limits, different people, and different allotment rules, wrapped in a single total that headlines love. If you remember one line, remember this: your result is decided inside the book you actually entered. A roaring qualified institutional buyer book does not hand you shares, and a crowded retail book does not become less crowded because institutions were also interested.

Retail: the ₹2 lakh line

A retail individual investor, in this framework, is a person applying for not more than ₹2 lakh in the issue. The application goes in lots. At cut-off, the cheque that counts toward the ceiling is based on the upper price. Cross ₹2 lakh and you are not a slightly larger retail applicant. You are in a different category, or you are holding an invalid retail form. One PAN is one applicant. Splitting the same person across brokers does not create a second retail identity.

Retail typically receives about 35% of the net offer on a book-built mainboard issue, after reservations are carved out. In return, retail gets the cut-off option and, when the retail book is oversubscribed, a lottery that tries to spread minimum lots widely. The point of that design is breadth. It is not a reward for bidding the maximum. Allotment is the mechanism. How to apply is the form that keeps you inside this book on purpose.

NII: above ₹2 lakh, and then split again

Non-institutional investors are applicants who are not QIBs and who bid above the retail ceiling. High-net-worth individuals is the casual name. The category’s share of a typical mainboard book is about 15%. SEBI further split this book so that smaller NII applications — those between ₹2 lakh and ₹10 lakh — have their own slice, and applications above ₹10 lakh have a larger slice. The point of the split was to stop the very biggest bids from taking the entire non-institutional portion.

NII bidders do not get the retail cut-off comfort as a category rule. They bid a price. Allotment is proportionate inside their slice, not a retail-style lottery for one small lot. If you wander into this book because you wanted “better chances”, you have changed the product: more money at risk, no cut-off, different draw. Do it only if that was the decision. The subscription guide shows how an enormous NII multiple can dominate a headline while saying little about retail odds.

QIB: institutions, anchors, and half the book

Qualified institutional buyers — mutual funds, banks, insurers, foreign portfolio investors that qualify, and similar institutions — typically get about 50% of the net mainboard offer. A portion of that is reserved for mutual funds. Anchors can take a large part of the QIB portion the day before the issue opens, with lock-in after. Anchor investors is that subplot.

QIB subscription is watched because these buyers write large cheques and see management. It is still a bid at the issue price under a mandate, not a public oath to hold for five years. Some of the shares are locked when they are anchor shares. The rest of the institutional book can be freer. A 70× QIB figure means the institutional portion was covered seventy times. It does not mean seventy institutions each did deep work, and it does not set the listing price.

Reservations that sit in front of the split

Employees and eligible shareholders of a parent company are sometimes given a reservation. Those shares are set aside before the remaining “net offer” is split into QIB, NII, and retail. The discount, if any, and the eligibility record date are in the prospectus. Applying in a reservation you do not qualify for is a good way to have the form rejected. Applying in retail when you qualified for a shareholder reservation is allowed as a retail bid, but it is a different bucket with a different size. Read the category names on the broker screen against the prospectus, not against a blog’s abbreviation.

SME books are not this chapter

The 50 / 15 / 35 pattern is a mainboard book-building pattern. SME issues use their platform’s rules and a larger minimum ticket. You will see the same words — retail, HNI — used loosely in commentary. The prospectus definitions are the ones that allot the shares. Mainboard versus SME and SME risks are the neighbouring reads. Do not force this grid onto an SME row on the subscription tracker and then feel informed.

How to read a tracker row after this

Look at retail if you applied retail. That multiple is your crowd. Look at NII if you applied NII. Look at QIB to understand who else accepted the price, then discount the temptation to borrow their credibility. Look at the total last, as a headline you now know how to unpack. Empty cells mean the file has not arrived, not that the category subscribed zero with confidence. And none of the cells are a substitute for the risk factors. Categories describe the room. They do not describe the business being sold in the room. The disclaimer is the line under the table.