Grey-market premium, usually shortened to GMP, is an unofficial price quoted for shares that are not listed yet. Take the upper end of the IPO price band. Add the premium dealers are talking about. That sum is the unofficial price. Subtract the upper band and you are back at the premium. The gain percentage on a tracker is the premium divided by the upper band. None of this is printed by NSE, BSE, or SEBI. There is no official order book, no circuit, and no settlement guarantee behind the quote. It is chatter with a number attached.

The GMP tracker stores the latest premium we have for each live issue and shows an estimated listing price. That estimate is upper band plus GMP. If either input is stale, the estimate is stale. A zero can mean “no quote today” rather than “dealers agree the premium is nothing”. Read the IPO page history before you treat one cell as a trend.

Where the quote comes from

Before listing, some people are willing to deal in IPO allotments or in shares that will exist later. The prices they mention among themselves get repeated in messages, forums, and market columns. A tracker collects a version of that repetition. It does not audit the trades. A quote can be a genuine indication of size. It can also be a number repeated because it was repeated yesterday. Different desks can quote different premiums on the same afternoon. When you see a single GMP on a website, you are seeing one stored figure, not the full range of conversations.

This is also why the number moves at odd hours. It is not waiting for the exchange to open. A weak US market overnight, a sudden jump in subscription, or a rumour about the anchor book can change the conversation. Some of those inputs are real. Some are noise. The GMP itself does not label which is which.

What the arithmetic is allowed to say

Illustration, not a live call. Upper band ₹250. Stored GMP ₹60. Estimated listing price ₹310. Gain versus the upper band: 60 / 250 = 24%. The minimum lot is 60 shares, so one lot costs 60 × ₹250 = ₹15,000 at the top of the band. If the share actually opens at ₹280, the GMP overstated the opening print by ₹30 a share, which is ₹1,800 on one lot. If it opens at ₹330, the GMP understated it. Both outcomes are normal. The page did not malfunction. The quote was never a forecast contract.

Kostak and other subject-to-allotment rates are a further layer of unofficial jargon: a price for an application itself, paid whether or not you wanted to hold the shares. We do not build a product around that rate. Dealing in unlisted securities outside the permitted routes can be illegal. Publishing a GMP so that readers are not flying blind when they meet the number elsewhere is not the same as arranging a grey-market trade. We do not arrange trades. Do not message the contact form asking for a seller or a buyer.

Why listing day disagrees with the quote

The opening price is an auction among people who have shares or who want them, inside the exchange’s pre-open rules, with real money and real settlement. The grey market is smaller, unofficial, and often about expected allotments rather than about investors who have read the risk factors. Four ordinary reasons the two prices diverge:

  • The final subscription file, published after the close, looked different from the midday file the quote was reacting to.
  • Global markets or the Indian index moved between the last GMP you saw and the pre-open auction.
  • The quote was for a small size. The listing auction is larger. Thin quotes move more than they should.
  • Sellers who received allotment wanted cash on day one, more of them than the quote assumed, or fewer.

SME premiums diverge for an extra reason. The unofficial quote and the listed market can both be thin, so a large percentage is sometimes a few lots. Compare SME rows with SME rows. The mainboard versus SME guide is the structural version of that warning. A 40% SME premium and a 40% mainboard premium are not the same evidence.

How not to use the column

Do not rank IPOs by GMP and apply to the top three. The premium says nothing about debt, customer concentration, or whether the offer is mostly an exit for existing shareholders. Do not average GMP across a week and call it a target. A premium that existed for two days and vanished on the third day has a story; the average hides it. Do not add GMP to the lower end of the band. Trackers, including this one, add it to the upper end, because retail cut-off applications are blocked at the upper end and the discovered price is often the cap when the book is hot. If the discovered price is the floor, the relevant gap changes. Check the final price.

Do not treat a negative GMP as a moral failing of the company. It means the unofficial quote is below the cap. Sometimes the band is ambitious. Sometimes the market is sour on every new issue that week. The prospectus can tell you about the first cause. The GMP cannot tell you which cause you are looking at.

A better sequence

Read the band, the lot, and the fresh-issue versus offer-for-sale split. Read subscription by category on the subscription tracker, not only the total. Look at GMP last, as a mood board, and look at its history on the IPO page rather than a single print. Then stop, and decide from the offer document whether the upper price is one you can live with if the share lists flat. Using GMP without chasing it is the longer version of that discipline. The disclaimer is the short version: the number is indicative, unofficial, and not advice.