Before a company rings the listing bell, it files a small library of documents — and the DRHP vs RHP question is only where the confusion starts. There are six of them, each written at a different stage, each revealing a different slice of the truth. For a retail applicant deciding whether to put money into an issue, the single most useful one is the Red Herring Prospectus: it is the complete, regulator-reviewed story of the business, filed just before the issue opens. Everything else either says less, or arrives after your application window has already closed.
This guide ranks all six documents by how much a retail applicant actually learns from each, from the dense RHP down to the one-page price-band advertisement. If you would rather build this understanding on a proper foundation than piece it together issue by issue, a structured stock market course walks you through primary-market reading end to end. Let us start with the ranking, then take each document in turn.
Key takeaways
- Read the RHP before you apply. It is the most complete document available during the issue window — the DRHP updated after SEBI’s review.
- The DRHP comes first and tells you nearly everything, but it is a draft that SEBI can still send back for changes.
- The final prospectus reveals the most of all — actual price and shares allotted — but it is filed after the issue closes, too late to inform your decision.
- The price-band advertisement reveals the least (band and dates only) yet it is the most time-critical: it lands at least two working days before the issue opens.
Which IPO document reveals the most?
For a decision made during the issue window, the Red Herring Prospectus (RHP) reveals the most usable detail, with the Draft Red Herring Prospectus (DRHP) a close runner-up. The RHP is simply the DRHP after SEBI has reviewed it and the company has incorporated the regulator’s observations, so it carries the same deep disclosure — business model, risk factors, financials, objects of the issue — in its most current form. The final prospectus technically reveals even more, but it only exists once the issue has closed, which is why it does not win for a live applicant.
The scorecard below ranks all six documents by practical disclosure value — how much you learn, weighed against whether you can still act on it. Note the pattern: the documents that reveal the most arrive earliest or latest, while the thin ones cluster around the days the issue is actually open.
| Rank | Document | What it reveals | When it appears | Verdict |
|---|---|---|---|---|
| 1 | Red Herring Prospectus (RHP) | Full, SEBI-reviewed disclosure; price band, not final price | Filed with RoC before the issue opens | The one to read before applying |
| 2 | Draft Red Herring Prospectus (DRHP) | Same depth as RHP, in draft form; no final price or share count | Filed with SEBI first; public for comment | Earliest full picture; still subject to change |
| 3 | Final prospectus | Everything, including final price and shares allotted | Filed with RoC and SEBI after the issue closes | Most complete — but arrives after you apply |
| 4 | Abridged prospectus | Salient features only — a summary of the prospectus | Attached to every application form | Quick read; go to the RHP for depth |
| 5 | Basis of allotment | Subscription by category, oversubscription, allotment method | Published a few days after the issue closes | Tells you the outcome, not the story |
| 6 | Price-band advertisement | Price band, lot size and bid dates — nothing more | At least two working days before the open | Thin, but the trigger to act |
Source: SEBI (ICDR) Regulations 2018 and Companies Act 2013, as described in NIFM’s primary-market material, 2026.
Read the table as a map of the issue’s life: the DRHP and RHP sit at the front, the two thin documents (the price-band ad and the abridged prospectus) cluster around the open, and the final prospectus and basis of allotment arrive at the back once bidding is done. Knowing which document exists at which moment is half of IPO-document literacy — the other half is knowing what each one is honestly good for.
The 6 IPO documents, ranked by what they reveal
Here is each document in order, with what it reveals, its trade-off and the one fact worth remembering. The timeline below shows where each sits across the life of an issue — a sequence we walk through end to end in our explainer on the IPO process in India, from DRHP filing to listing day.
The thickest documents arrive first and last; the thin ones bracket the open
Source: SEBI (ICDR) Regulations 2018 issue sequence, 2026. Illustrative ordering, not to scale.
1. Red Herring Prospectus (RHP)
The RHP is the DRHP after SEBI has reviewed it and the company has folded in the regulator’s observations. It is filed with the Registrar of Companies before the issue opens and is the most complete document you can read while you can still apply. It carries the full business description, audited financials, risk factors, the objects of the issue and the capital structure. For a book-built issue it is called a “red herring” because one thing is still missing: the exact final price. That single omission is why it ranks first for a live applicant and not the final prospectus — it has everything you need to judge the business, and it exists at the moment you must decide.
Trade-off: it is long and dense, often running to hundreds of pages. The fix is to read it in the order that matters — risk factors, objects of the issue, financials, promoter background — rather than cover to cover.
2. Draft Red Herring Prospectus (DRHP)
The DRHP is the first version of the offer document, filed with SEBI and mandatory under the SEBI (ICDR) Regulations, 2018. It contains almost everything the RHP does — the same depth of business, financial and risk disclosure — but it is a draft. SEBI examines it and issues an observation letter, and the draft is hosted publicly for comment, commonly for about 21 days. Because SEBI can and usually does ask for changes, any figure or claim in the DRHP may be revised by the time the RHP lands.
Trade-off: it is the earliest full look at a company planning to list, which is excellent for research, but you must treat it as provisional. If you want a method for reading it critically, we cover exactly that in our guide on how to analyse an IPO before applying, with DRHP red flags.
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The final prospectus is filed with the Registrar of Companies and SEBI after the issue closes and the price is fixed. It is the most complete document of all because it fills in the two blanks the RHP left open: the final issue price and the number of shares allotted. On paper it reveals the most — but it is published once bidding is over, so it cannot inform your decision to apply. Its value is for the record, for post-issue analysis, and for anyone studying how the final terms compared with the draft.
Trade-off: maximum disclosure, minimum timeliness. Useful for learning and auditing, useless as a pre-application checklist.
4. Abridged prospectus
The abridged prospectus is a condensed memorandum of the salient features of the full prospectus. Under the Companies Act, 2013, every application form must be accompanied by one, and the Act leaves the detailed contents to SEBI, which specifies them in its ICDR disclosure schedule. SEBI revised the format in a circular dated 4 February 2022 to make sure the most critical information — objects of the issue, risk factors, financials in brief, promoter and management background, and the lead managers and registrar — sits up front.
Trade-off: it is fast to read and genuinely useful for a first pass, but by design it is a summary. Any serious decision should move from the abridged document to the RHP it points back to.
5. Basis of allotment
The basis of allotment is the registrar’s document, finalised with the stock exchange, that explains how shares were distributed once the issue closed. It shows the number of valid applications in each category — retail, non-institutional and qualified institutional — the level of oversubscription, and the method used to allot: proportionate where possible, and a lottery of the minimum lot where the retail portion is heavily oversubscribed. SEBI’s framework aims to give at least one lot to as many individual applicants as possible, which is why in a hot issue many applicants get either one lot or none.
Trade-off: it reveals the outcome, not the company. It tells you whether your funds will be unblocked, but says nothing that would have helped you decide to apply in the first place. For how the categories work, see our explainer on book building versus fixed-price IPOs and how the issue price is set.
6. Price-band advertisement
The price-band advertisement is the thinnest document in the set and, paradoxically, the one you cannot ignore. For a book-built issue the issuer announces the price band — or a floor price — at least two working days before the issue opens, in the same newspapers that carried the pre-issue advertisement. The upper end of the band may not exceed the floor by more than 20 per cent. Beyond the band, it carries the lot size and the bid dates. That is all it reveals, and that is the point: it is not meant to inform your view of the business, only to tell you the terms and the clock.
Trade-off: almost no disclosure, maximum urgency. Treat it as the starting gun, not the research.
DRHP vs RHP: which should you actually read before applying?
This is the comparison most applicants get stuck on, so it is worth settling directly. The DRHP and RHP are the same document at two stages of its life; the final prospectus is a third stage that arrives too late to act on. The table below lines them up on the three things that decide which you should open.
| Criterion | DRHP | RHP | Final prospectus |
|---|---|---|---|
| Filed with | SEBI (for review) | Registrar of Companies, before open | RoC and SEBI, after close |
| Final price shown | ✗ No | ✗ No (price band only) | ✓ Yes |
| Can act on it as an applicant | ✓ For research | ✓ Yes — the one to read | ✗ Too late |
| Still subject to change | ✗ Yes, SEBI may revise | ✓ Largely settled | ✓ Final |
Source: SEBI (ICDR) Regulations 2018 and Companies Act 2013, 2026.
The practical answer: use the DRHP to research a company early, and read the RHP before you apply because it is the current, regulator-reviewed version. Keep the final prospectus for afterwards, when you want to see the exact terms the issue settled on.
How to use each IPO document at the right stage
Documents are only as useful as the moment you open them. The three numbers below set the rhythm of an issue — miss them and even the best document arrives at the wrong time.
Weeks or months before the issue: if the company has filed its DRHP, this is your research window. Read it the way we describe in our DRHP red-flags guide — start with risk factors and the objects of the issue, then test the financials. Treat every number as provisional until the RHP confirms it.
Just before the open: watch for the price-band advertisement, which appears at least two working days ahead. When the RHP is filed with the Registrar of Companies, switch to it — it is the DRHP brought current, and it is what you read to make the final call. The abridged prospectus attached to the application form is a fair quick reference, but it points back to the RHP for anything that matters.
During the open: you now have the band, the lot size and the dates. The decision work is done by the RHP; the open days are for applying, not for first-time research. Knowing how the retail, non-institutional and qualified-institutional buckets differ helps here, which we cover in our explainer on the IPO subscription categories.
After the close: the basis of allotment lands a few days later and tells you the subscription figures, the oversubscription and whether you received shares. If you want the full sequence from filing to listing day in one place, our IPO-process walkthrough maps every one of these stages against the calendar.
The verdict
Best to read before applying: the RHP — the complete, SEBI-reviewed document, current as of the issue.
Best for early research: the DRHP — the earliest full picture, as long as you treat it as a draft.
Best for the record: the final prospectus — the most complete, but published after you apply.
Best for a quick reference and the clock: the abridged prospectus and the price-band advertisement — thin, but the ones attached to your form and your calendar.
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What is the difference between a DRHP and an RHP?
The DRHP (Draft Red Herring Prospectus) is the first version of the offer document, filed with SEBI for review. The RHP (Red Herring Prospectus) is that same document after SEBI’s observations have been incorporated, filed with the Registrar of Companies just before the issue opens. The RHP is the current, review-cleared version, so it is the one to read before applying.
Which IPO document should a retail investor read before applying?
The RHP. It carries the full, SEBI-reviewed disclosure — business, financials, risk factors and the objects of the issue — and it exists while the issue is still open. The only thing it leaves out for a book-built issue is the final price, which is set after bidding closes.
Why is it called a red herring prospectus?
Because it deliberately omits key final details — chiefly the exact issue price and the precise number of shares — until the book-building process is complete. The phrase refers to that intentional gap; the document is otherwise a complete offer prospectus.
When is the basis of allotment published?
Typically a few days after the issue closes, once the registrar has finalised allotment with the stock exchange. It shows the subscription in each category, the level of oversubscription and the method used — proportionate or, for a heavily oversubscribed retail portion, a lottery of the minimum lot.
What does the price-band advertisement tell me?
Only the essentials to act: the price band (the floor and a cap no more than 20 per cent above it), the lot size and the bid dates. For a book-built issue it is published at least two working days before the issue opens, in the same newspapers as the pre-issue advertisement. It is the trigger to apply, not a source of research.
Disclaimer: This article is for educational purposes only and does not constitute investment advice, nor a view on any specific IPO. It explains document types, not whether to apply to any issue. Markets carry risk — please do your own research or consult a qualified financial professional before investing. NIFM provides training and exam preparation; certification exams conducted by regulatory or professional bodies are administered by those bodies independently.
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