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IPO grey market premium (GMP), honestly

The number every IPO applicant checks and few understand. What the grey market actually is, how GMP is quoted, why it swings, and how badly it can mislead on listing day.

Market BasicsIntermediate10 min read

Written by Onam SharmaLast reviewed Report a correction

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In the days before an IPO lists, one number circulates on every forum and messaging group: the grey market premium, or GMP. Applicants treat it as a preview of listing-day profit. It is worth understanding exactly what it is — because it is neither official, nor regulated, nor as predictive as its popularity suggests. It is a sentiment reading from an unofficial market, and reading it well means knowing how often it is wrong.

What the grey market actually is

Before shares list on the NSE or BSE, they cannot be traded on the exchange — but an informal market exists where dealers quote a price for them anyway, settled privately on trust. The grey market premium is the amount above the IPO issue price at which those not-yet-listed shares change hands there. It is not run by SEBI, the exchange or the company; it is a network of dealers, and the number you see is their collective guess at where the stock will open.

Worked example
Reading a GMP quote
IPO priced at ₹300, GMP ₹90
Issue priceWhat you pay to apply₹300
Grey market premiumThe unofficial premium being quoted₹90
Implied listing priceIssue price + GMP₹390
Implied listing gainWhat the grey market is hinting at~30%
What it actually isNot a promise, and often wrongA sentiment quote
The arithmetic is simple: issue price plus GMP is the price the grey market expects on listing. The catch is entirely in the last line — that ₹390 is a mood reading from a thin, unregulated market, and by the actual listing the stock can open well above, well below, or nowhere near it.

Kostak and subject-to-sauda

Two related grey-market terms appear alongside GMP. A Kostak rate is a fixed price someone pays to buy your whole application, allotment or not. Subject-to-sauda is the same idea but the deal only holds if shares are actually allotted. Both let an applicant lock in a certain amount before listing instead of gambling on allotment and the open. Like GMP itself, they are informal, unregulated and settled on trust — worth knowing as vocabulary, not as something a retail investor should be doing.

GMP as a signal
What GMP can loosely tell you
  • How excited the informal market is
  • Whether demand is rising or fading pre-listing
  • A rough, uncertain hint at the open
  • That an issue is being hyped, if it spikes
What GMP cannot tell you
  • The actual listing price
  • Whether the company is fairly valued
  • Your allotment odds
  • A return you can count on
Check yourself

An IPO is priced at ₹250 with a grey market premium of ₹120. What does that GMP actually represent?

Simple bhasha mein
Andar-andar ka bhaav

GMP matlab listing se pehle jo shares chupke-chupke jyada daam pe bik rahe hain — ₹300 ka issue, ₹90 GMP, toh log ₹390 dene ko taiyaar. Yeh sirf mood hai, ek ghair-sarkari bazaar ka andaaza — na SEBI, na guarantee. Aksar galat nikalta hai: mota GMP dekh ke apply kiya aur listing flat. Company aur bhaav dekh ke faisla karo, GMP sirf halka ishaara — kabhi apply karne ki wajah nahi.

What to remember
  • GMP is the premium over the issue price at which unlisted IPO shares trade in the informal grey market.
  • Issue price plus GMP is the market’s rough guess at the listing price — not an official or reliable figure.
  • It measures demand sentiment, not company value, and frequently misses the actual open.
  • The grey market is unregulated with no investor protection; retail investors should not participate in it.
  • Decide on business and valuation first; use GMP only as a weak sentiment check, never the reason to apply.
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Common questions

Short, direct answers to what people ask about this topic.

what is gmp in ipo
GMP, or grey market premium, is the extra price at which an IPO’s shares are being bought and sold unofficially before they list on the exchange. If an IPO is priced at ₹300 and the GMP is ₹90, it means people in the grey market are willing to pay ₹390 for shares not yet listed — implying an expected listing around that level. It is a sentiment gauge from an informal, unregulated market, not a figure from SEBI, the company or the exchange, and it can change hour to hour right up to listing.
is gmp reliable for ipo listing gains
GMP is a rough indicator of demand, not a reliable forecast of the listing price. It reflects the mood of a small, unofficial market and is frequently wrong — strong GMP has preceded flat or negative listings, and modest GMP has preceded big pops. It is also thin and easily influenced, so a high number can be talked up to encourage applications. Treat it as one weak signal of sentiment, never as a promised return, and never apply to an IPO you would otherwise skip just because its GMP looks attractive.
is grey market trading in ipo legal in india
The IPO grey market operates outside the regulated exchange framework, is not recognised or overseen by SEBI, and settles on personal trust between dealers rather than through the clearing system. That means it carries no investor protection at all — there is no recourse if a counterparty defaults. Ordinary retail applicants do not need to touch it; the GMP number that circulates is simply a quote from that market, and reading it is different from participating in it, which retail investors should not do.
what is the kostak rate and subject to sauda
Kostak and subject-to-sauda are two grey-market deals on an IPO application itself rather than on the shares. A Kostak rate is a fixed amount someone pays to buy your entire application before listing, whether or not you get an allotment. Subject-to-sauda is similar but the deal only stands if shares are actually allotted. Both are informal, unregulated arrangements used to lock in a price before listing day, and like GMP they carry no legal protection.
why does gmp change every day before listing
Because it is pure sentiment in a thin market, GMP moves with the flow of news and the subscription numbers as the issue progresses. A heavy QIB bid, a strong overall subscription figure or bullish broader markets push it up; a weak response or a market wobble pulls it down. With few participants, even small shifts in mood or a handful of quotes move the reported number, which is exactly why a figure taken days before listing tells you little about the actual opening price.