The point
A grey market premium is the price a handful of unregistered dealers privately quote above an IPO's issue price, before the shares list on any exchange. No clearing corporation stands behind the quote, and nobody who makes it has to honour it. It hints at what those dealers think that evening. It says nothing about the listing price, the demand in the official subscription books, or what the company is worth.
What the grey market actually is
The grey market is an unofficial, over the counter market that opens the moment an IPO's price band is announced and closes the evening before listing. There is no office, no login and no order book. Dealers build a client list through referral, the way any broker without paperwork has to. A deal happens over a phone call, sealed on personal trust (Chittorgarh, read 2026-09-23).
Two different things get quoted there, and they are not the same deal. The grey market premium, GMP, is a price per share, what a buyer will pay above the issue price for the shares themselves. Kostak is a price for an entire application, agreed before allotment is even known, paid whether or not the applicant is allotted a single share. Subject to sauda is a variant of Kostak that only pays out if the applicant actually receives an allotment. Its rate runs higher than Kostak's, because the buyer is taking a real chance of getting nothing.
Settlement runs on the same informal footing as the quote. Historically that meant a courier, an angadia, going door to door with cash on listing day. GMP deals are cancelled outright if the seller never gets an allotment, because there are no shares to trade at that point. Kostak deals are not: the buyer still pays, allotment or not, since a Kostak deal was never a bet on the shares in the first place.
Where the number in a headline comes from
A financial site's "IPO GMP today" figure is a poll of whichever dealers that outlet's reporters could reach by phone that day, averaged into one number. There is no published volume behind it, and no record of how many shares actually changed hands at that price. Nobody audits whether the quoted figure reflects one trade or none. Two outlets covering the same IPO on the same afternoon can print two different GMP numbers, because they polled different dealers.
Compare that with a number the exchange itself publishes. The subscription figures shown live during the bidding window come from actual bids, backed by blocked margin money under ASBA. The registrar tallies them and the exchange displays the total in real time. A GMP number carries none of that machinery; it is opinion sampling dressed as a data point.
Why nobody is obliged to honour it
On NSE or BSE, a matched trade settles through the clearing corporation, which guarantees delivery against payment regardless of what either counterparty does afterward. The grey market has no equivalent. SEBI has said publicly that trading in listed or soon to be listed securities may only happen through recognised exchanges. It cautions investors against grey market dealing precisely because none of its protections apply there (CARCIL, National Law University and Judicial Academy Assam, read 2026-09-23). No specific law bans the grey market outright, and no regulator recognises it either. A side that walks away from a deal leaves the other with no forum to complain to.
That absence is the whole point of a GMP quote. A stranger's number from one evening, on a trade nobody must complete tomorrow, cannot anchor a decision.
The one thing GMP captures, and the three it misses
What it measures: the willingness of a small, self-selected pool of grey market dealers to pay above the issue price, at the hour they were asked. That figure moves through the bidding window as dealer demand shifts. It can run positive when they expect a strong listing, or negative when they expect a weak one.
What it does not measure: the price the stock will actually open at, the demand recorded in the exchange's own subscription numbers, or the value of the business being listed. None of the sources read for this piece publish a track record of how often a GMP figure has matched the eventual listing price. No agent writing for this platform states one without reading it fresh. The honest answer to "how reliable is GMP" is that nobody who quotes it publishes a scorecard.
On listing eve, what an investor actually knows
By the evening before listing, an investor knows two verified facts. The issue price is fixed and public, set since the day the price band closed. Whether they personally received an allotment is confirmed by the registrar. The opening price is unknown until the next morning. NSE's pre-open call auction discovers it then, matching real buy and sell orders from across the market into one single price before continuous trading starts. The pre-open auction is the market's own answer. A GMP figure read the night before was only ever somebody else's private guess.
Nothing a rule can act on
A number nobody has to honour cannot function as a rule, and a disciplined approach to any asset needs one it can actually check. A crypto index on Qatobit is built the other way. The QSI indices rebalance monthly against a published methodology the investor can see in advance. That methodology is fixed before the fact, unlike a dealer's quote that could change or vanish by tomorrow. A grey market premium only ever tells a reader what a small pool of dealers felt like betting for one evening.
A GMP headline is rarely the only piece of pre-listing noise worth checking against structure instead of sentiment. The same discipline applies to why the institutional book fills last and to what an offer for sale actually sells the buyer. The broader mechanics of an Indian IPO sit underneath all three.
Frequently asked questions
What is GMP in an IPO?
GMP, grey market premium, is the amount above an IPO's issue price at which unregistered dealers privately quote the shares before listing. It has no exchange, no clearing corporation and no legal obligation behind it, so it reflects a handful of private opinions rather than a verified market price.
What is the full form of GMP in an IPO?
GMP stands for grey market premium. It is the price gap between an IPO's official issue price and the unofficial rate dealers quote for the same shares before listing.
Is GMP reliable?
Nothing enforces a GMP quote, and no dealer publishes a track record of how often their number matched the actual listing price. It reflects sentiment among the people quoting it at that hour, unverified and unaudited.
Who decides the grey market premium?
The dealers active in the unofficial grey market decide it, based on what they personally see of demand for an IPO's shares or applications. No exchange, registrar or regulator sets or confirms the figure.
Is grey market trading legal in India?
No specific law names or bans the grey market. SEBI does not recognise or regulate it. It has publicly said that trading in listed or soon to be listed securities may only happen through recognised exchanges (CARCIL, read 2026-09-23). A grey market deal that goes wrong has no regulatory forum to appeal to.
Crypto investments are subject to market risk. Not financial advice.
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