IPO GMP Explained

In the days before an IPO opens for bidding, a single number starts travelling through messaging groups, video thumbnails and finance websites: "GMP ₹45" or "grey market premium 60". It does not come from the company, the lead managers, the stock exchanges or SEBI. It comes from an informal off-market network in which people agree to buy and sell shares of a company that has not yet listed, and sometimes to buy and sell IPO applications themselves. The grey market premium, usually shortened to GMP, is the rate at which those informal deals are being quoted, expressed as an amount above the issue price.

This article explains only the mechanics: what the number represents, where it is generated, how it is quoted, and what moves it. The separate question of what can go wrong when a retail investor acts on it is handled in the companion article Grey Market Premium Risks. The two belong together, because understanding how a number is produced is what tells you how much weight it can carry.

What the grey market actually is

The IPO grey market is a network of independent dealers and their clients who trade an exposure to a company's shares before those shares exist in any tradable form. There is no exchange, no visible order book, no clearing corporation standing between the two sides, no contract note, and no settlement guarantee. Deals are struck over calls and messages, recorded informally by the dealer, and settled in cash between the parties once the shares list and the difference between the agreed rate and the actual price is known.

Because there is no central venue, there is also no official price. What circulates as "the GMP" is a dealer's indicative quote, closer in nature to a shopkeeper naming a rate than to an exchange reporting a last traded price. Two dealers in two cities can quote different numbers on the same morning, and both quotes are equally unofficial.

Why such a market exists at all

Two groups meet in the grey market for opposite reasons. On one side are people who want exposure to a listing without going through the application process, or who expect not to receive an allotment at all because heavily oversubscribed retail categories are settled by a computerised draw rather than by application size. Buying in the grey market is a way of obtaining that exposure directly. On the other side are applicants who would rather convert an uncertain outcome into a fixed amount today, and who are willing to sell the application, or the shares they might receive, at an agreed rate.

That second motivation is why application-level rates exist alongside share-level rates. An applicant who sells at a fixed rate has effectively swapped an uncertain claim for cash. The point here is not whether that swap is sensible, but that the trade has a logical basis, which is why the market has persisted despite having no official standing anywhere in the regulated system.

Where GMP sits in the IPO timeline

Grey market activity clusters into a narrow window. Serious quoting usually begins around the time the price band becomes public, because a premium is quoted relative to a price, and until a band exists there is nothing to add the premium to. Quoting continues through the bidding period, intensifies after the issue closes and the subscription figures are known, and stops the moment the shares list, because from that point a real exchange-discovered price exists and there is nothing left to guess at.

Anything quoted before a price band is announced is a premium on an assumed price, which is a guess stacked on a guess. A GMP shown for an issue whose band has not yet been declared tells you something about the quote rather than about the company.

How the number is expressed

GMP is quoted as rupees per share above the issue price, and in practice the reference price is usually the upper end of the band, because most retail applications are placed at the cut-off. Take an illustrative example: suppose a company announces a band of ₹190 to ₹200 and the grey market quotes a premium of ₹40. The implied grey market rate per share is ₹200 plus ₹40, or ₹240, which works out to a 20 per cent premium over the cap. Those figures are invented purely to show the arithmetic and describe no actual company or issue.

The same quote is often republished as a percentage or as an "expected listing price", both of which are just the rupee premium restated in another form. No new information is added by the conversion. When a website displays an expected listing price, it has almost always been produced by adding the quoted premium to the cap price rather than by any independent estimate of what the shares are worth.

Three different things get quoted, not one

Newcomers often assume GMP is the only rate in the grey market. In practice, three distinct quotes circulate, and they answer different questions.

• Grey market premium: a per-share rate. The deal is on shares, and it presumes the buyer ends up holding shares once allotment and credit are complete.
• Kostak rate: a flat amount paid for an entire IPO application, agreed before allotment is known. The buyer pays that amount to the applicant and the deal stands whether or not the application receives any allotment.
• Subject to sauda, sometimes written as "subject to allotment": also a per-application rate, but the deal only comes into effect if the application actually receives an allotment. Because the seller receives nothing when there is no allotment, this rate is normally quoted higher than the kostak rate for the same issue.

The difference is easiest to see with illustrative numbers. Suppose a lot is 70 shares and a kostak rate of ₹800 is agreed. The applicant receives ₹800 for handing over the application, whatever happens later. If instead a subject-to-sauda rate of ₹4,000 is agreed, the applicant receives nothing if the application fails to get an allotment, and ₹4,000 if it does. The two rates price two different uncertainties: one prices the application, the other prices the allotment.

Who produces the quote, and how it reaches you

The quotes originate with a small number of dealers, historically concentrated in a few trading communities and cities, who maintain informal books of buyers and sellers. They are not acting as registered intermediaries in this activity, and the activity itself is not a recognised segment of any exchange. Their quotes pass to sub-dealers and clients, are picked up by aggregator websites and social channels, and finally reach a retail reader as a screenshot with a number on it.

By the time the figure appears on a public page, several things have been lost: who quoted it, at what time, in what size, and whether any transaction occurred at that level at all. An exchange publishes price alongside traded quantity and timestamp, so a reader can judge whether a price is meaningful. A grey market quote carries none of that context, which is a large part of why the same issue can show materially different premiums across different websites on the same day.

“A grey market quote is a price without a market: no venue publishes it, no clearing house stands behind it, and the reader has no way to see the trade that supposedly produced it.”

What moves the number

A grey market participant who buys at a premium is taking a position that the listing price will be higher still. The quote therefore behaves like a running consensus about listing-day demand, and it moves when the inputs to that consensus move.

• Subscription momentum. As category-wise subscription figures build through the bidding window, the quote typically responds. How those figures should be read is covered in IPO Subscription Data Explained.
• The anchor book. Which institutions took the anchor allocation, and whether that portion was fully taken up, is one of the earliest hard signals available before public bidding starts.
• Free float and issue size. When a smaller portion of the company is being offered, fewer shares are available to trade on listing day, and participants often treat scarce float as supportive of a higher opening price.
• Broad market direction. Several days can separate the issue closing from the listing, and general market movement in that gap changes what participants expect at the open.
• Valuation against listed peers. Where the band sits relative to comparable companies affects how much headroom participants believe exists above the issue price.

Notice what is absent from that list: the audited quality of the business, the durability of its cash flows, the strength of its balance sheet, or any assessment of what the company might be worth over several years. The grey market prices one day's expected outcome, not the ownership of a business over time. That is a description of what the number is designed to do, not a criticism of it.

Why a thin market produces a volatile number

The mechanical reason GMP swings sharply is participation. The pool of people trading before listing is tiny compared with the market that exists after listing, and none of them are obliged to publish size. In a market with few participants and no disclosure requirement, a handful of trades, or even one confident dealer revising a quote, can move the headline figure by a large percentage. Supply and demand genuinely set the number, but it is the supply and demand of a very small group.

That also explains a pattern readers often find puzzling: a premium widening and then collapsing within two sessions with no new public information about the company. Nothing about the business changed. The small pool of participants revised its view, and the revision showed up immediately because there was nothing to absorb it.

GMP and the listing price come from different machinery

The listing price is not derived from GMP in any procedural sense. On listing day the exchange runs a special pre-open call auction in which orders from every category of investor are collected and matched to determine an equilibrium opening price. That process involves the whole market, published order information and exchange rules. The grey market quote involves a small informal group with no disclosure obligations. The two numbers can end up close together, far apart, or on opposite sides of the issue price, and no mechanism ties one to the other.

This deserves precision, because the vocabulary around GMP quietly implies a link. A phrase like "expected listing price" describes a forecast, not a scheduled event. What actually happens on listing day is set out in IPO Listing Date Explained, and the way a listing gain is measured is covered in IPO Listing Gains Explained.

Where the grey market stands in the regulated system

Grey market transactions sit outside the regulated market entirely. They are not routed through a stock exchange, not settled by a clearing corporation, not reflected in any demat account until the actual allotted shares are credited, and not covered by the investor protection and grievance mechanisms that apply to dealings with registered intermediaries. There is no contract note to produce if a counterparty does not honour the deal.

That single structural fact drives most of the practical problems with acting on GMP, and those problems are set out in full in Grey Market Premium Risks rather than repeated here.

Reading a quote precisely, if you read one at all

If a GMP figure is going to be in front of you anyway, the least you can do is read it accurately rather than as a headline.

1. Check the date and time of the quote. A three-day-old premium for an issue that closed yesterday is describing a different situation.
2. Check which price it is a premium over: the cap of the band, the floor, or an assumed price if the band has not been declared yet.
3. Check whether the figure is per share or per application. A ₹40 per share premium on a 70-share lot is a completely different rupee amount from ₹40 per application.
4. Check whether you are looking at a GMP, a kostak rate or a subject-to-sauda rate, since all three are commonly printed in the same table with similar labels.
5. Compare two or three sources. Wide divergence between them is itself information about how firm the quote is.

None of these checks makes the number dependable. They only stop you from misreading what the number claims to say, which is a smaller but achievable goal.

How this fits with the rest of the IPO process

The grey market premium is one of the last things to appear in the IPO sequence and by far the least documented. Everything else — the offer document, the price band, the category structure, the anchor allocation, the allotment mechanics and the listing process — is published by the issuer, the registrar, the exchanges or SEBI, and is explained across the rest of this series. A reader who understands how a band is arrived at, how oversubscription changes allotment odds and how a company's restated financials are presented in its offer document will find the GMP number a good deal less mysterious, and a good deal less compelling, than it looks at first.

Read as what it is, GMP is a description of one small group's expectations on a particular morning, arrived at without any disclosure obligation and without any record a reader can inspect. That is the whole of what the number is built to be.