IPO GMP Explained: What the Grey Market Premium Tells You, and What It Doesn't
Every big IPO comes with a 'GMP' number on social media. Here is what it means, how it is calculated, why it is unofficial, and why it is a poor guide to listing-day gains.
Every time a big IPO is announced, one number spreads faster than the prospectus: the GMP. With the Jio Platforms IPO opening on October 21, you will see it on WhatsApp forwards, YouTube thumbnails and broker chats. Here is what it actually means, and why it should never be the main reason you apply.
Quick answer
- GMP stands for grey market premium: the extra amount someone is willing to pay over the IPO's upper price band, before the shares list.
- It is traded in an informal, unregulated market. SEBI, NSE and BSE do not publish or recognise it.
- Traders estimate the listing price as upper price band + GMP.
- GMP changes daily and often swings sharply in the last two days before listing. It is a sentiment gauge, not a forecast.
What is the grey market?
The grey market is an unofficial market where people buy and sell IPO shares, or the right to an allotment, before those shares start trading on the stock exchange. There is no exchange, no clearing corporation and no written contract. Deals are made through dealers, mostly by phone, and rest on trust between the two sides.
Because nothing is recorded or regulated, nobody can force a dealer to honour a deal. If the market turns, a counterparty can simply walk away. That is the first thing to understand about GMP: it is a price from a market that offers investors no protection at all.
How is GMP quoted?
Dealers quote GMP in rupees per share. Suppose an IPO has a price band of ₹1,065 to ₹1,119, and the GMP is quoted at ₹100. That means grey market buyers are willing to pay about ₹100 above the upper band for each share.
Estimated listing price = upper price band + GMP
In this illustrative example: ₹1,119 + ₹100 = ₹1,219, which is about 9% above the issue price. Traders call this the "expected listing gain".
The numbers here are only for illustration. They are not a GMP for Jio Platforms or any other company.
What are kostak and subject-to-sauda?
You may also see two other rates:
- Kostak: a fixed amount paid for an entire application, regardless of whether it gets an allotment. The seller passes on whatever they receive.
- Subject-to-sauda: a price paid for an application only if it gets an allotment. If the application gets nothing, the deal lapses.
Both are informal arrangements with the same lack of protection as GMP.
Why GMP is a poor predictor
- It is thin and easy to move. A few dealers can shift the number. There is no public order book and no audited volume.
- It reflects mood, not value. GMP rises when markets are buoyant and collapses when they fall. It says nothing about whether the company is worth its price.
- It changes right up to listing. A high GMP during the subscription period can fall sharply after allotment, when sellers rush in.
- Listing day is set by the exchange. The opening price is discovered in a special pre-open session on listing day, based on real orders. It often differs from the last GMP.
- It ignores the long term. A strong debut tells you nothing about where the share will be in a year.
How should investors use GMP?
At most, treat GMP as one rough signal of demand, like a crowd's mood outside a stadium. Then do the real work:
- Read the red herring prospectus (RHP): the business, the risks and the use of the money.
- Compare the valuation with listed rivals.
- Check whether the issue is fresh shares, an offer for sale, or both. Our IPO guide explains the difference.
- Look at the subscription data by category on the NSE and BSE websites. That data is official.
Is trading in the grey market legal?
The grey market works outside the regulated system, so a trade there has none of the safeguards of an exchange trade: no investor protection fund, no grievance redressal and no guaranteed settlement. Never pay a stranger for an "allotment" or share your demat details to take part. If something goes wrong, you will have no one to complain to.
What happens after the IPO closes?
Since December 2023, SEBI's T+3 rule means shares list three working days after the issue closes: allotment is finalised one working day after closing, shares reach demat accounts the next day, and trading begins on the third. That short gap is when GMP talk is loudest. Our guide to checking IPO allotment shows where to find your result officially.
The bottom line
GMP is gossip with a number attached. It can tell you that many people are excited about an IPO. It cannot tell you whether that excitement is justified, or whether it will last past the first morning of trading. Apply only when the business and the price make sense to you, and only with money you can leave invested.
This article is for information only and is not investment advice.
Related reading
This article is for general information only and is not investment advice. Read the offer document or official filing and consult a SEBI-registered adviser before investing.
Sources
This article draws on the following reporting. Dates are when each source was originally published.
- Securities and Exchange Board of India: SEBI (official website)
- Business Standard: Sebi reduces timeline for listing shares to T+3 from T+6 from December 1 ·
- National Stock Exchange of India: Current and upcoming issues (IPO)
- Moneycontrol via TradingView: Jio Platforms IPO: Price band set at Rs 1,065-1,119 for India's biggest share sale ·
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Source: <a href="https://www.thedailymagazine.in/business/ipo-gmp-meaning">IPO GMP Explained: What the Grey Market Premium Tells You, and What It Doesn't</a>, The Daily, 15 Oct 2026.Written by
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