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What is GMP (Grey Market Premium) in an IPO
GMP is the unofficial premium an IPO's shares trade at in the grey market before listing. It is a sentiment read, not a regulated price, and it can collapse on listing day.
In one line
GMP, or Grey Market Premium, is the unofficial price over the IPO issue price that a stock changes hands at in the grey market before it lists, so a 200 rupee GMP on a 400 rupee issue implies an expected listing near 600, but it is an unregulated sentiment signal that can vanish by the time the bell rings.
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How the grey market actually works
The grey market is an informal, off-exchange network of dealers who quote two-way prices on an IPO between the day the issue opens and the day it lists. There is no clearing house, no SEBI oversight, and no settlement guarantee. A buyer and a seller agree a premium over the issue price, and the trade settles privately on listing.
Two numbers circulate. The GMP itself is the rupee premium over the issue price. The Kostak rate is what a buyer will pay for a full retail application regardless of allotment, and the subject-to-sauda rate is a deal that pays out only if shares are allotted. Retail investors mostly watch the headline GMP because it is the crude proxy for listing-day appetite.
Why GMP is a signal, not a promise
GMP tracks demand, and demand is fickle. A strong subscription number and a hot sector can push the grey market premium up in the final hours of the issue, then a weak global session on listing morning can wipe most of it out before retail ever sells a share. The premium is a mood ring, and the mood changes.
Treat GMP the way the desk does. It is one input next to the subscription multiple, the quality of the anchor book, the valuation versus listed peers, and the use of proceeds. A fat GMP on a thin business is a trap dressed as a tip. A cooling GMP into listing is a warning the desk respects.
FAQ3 reader questions · AEO-eligible
Common questions on what is gmp.
Is GMP legal in India?
The grey market itself is unregulated and operates outside SEBI's exchange framework. Trading on GMP carries counterparty risk because there is no clearing guarantee. Watching GMP as a sentiment indicator is common and not illegal, but acting on it is at your own risk.
Does a high GMP guarantee listing gains?
No. GMP only reflects expected demand at a point in time. It can collapse between the issue close and the listing if sentiment turns, so a high grey market premium is not a guaranteed profit.
Where does GMP come from?
It is quoted by informal grey-market dealers, not by any exchange or the company. Different sources can show different GMP numbers for the same IPO because there is no single official price.
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