Tools & Calculators
By HDFC SKY | Updated at: Oct 24, 2025 06:07 PM IST

GMP full form in IPO is Grey Market Premium. It refers to the premium amount at which IPO shares are traded in the unofficial grey market before their official listing on the stock exchange. GMP gives investors a rough estimate of how the IPO might perform once listed offering insights into market sentiment and demand for the shares.
GMP meaning in IPO stands for Grey Market Premium which represents the price at which IPO shares are traded unofficially before they are listed on the stock exchange. It acts as an indicator of market demand and investor sentiment for a particular IPO. For example, if a company’s IPO is priced at ₹100 and the GMP is ₹40 it means investors are willing to pay ₹140 per share in the grey market. While GMP is not regulated or officially tracked by SEBI, it is widely monitored by traders and investors to gauge the potential listing gain. However relying solely on GMP can be risky as it may not always reflect the actual performance post-listing.
Grey market trading occurs unofficially before an IPO lists on stock exchanges. It gives early signals about investor sentiment and expected pricing.
Unauthorised people who purchase or sell initial public offerings (IPO) shares on an unofficial market (over-the-counter market) are known as grey market traders. The grey market dealers may also be obliged to underwrite a specific percentage of the IPO.
There are no registered traders in the IPO grey market because it is an unofficial and unregulated industry. To find out who participates in the grey market and if they can assist you in finding buyers or sellers for your transactions you should check with your local dealers.
GMP (Grey Market Premium) in IPO reflects the extra amount investors are willing to pay over the issue price in the unofficial market before listing.
IPO shares are traded in the grey market through informal over-the-counter (OTC) deals before the official stock market listing.
It’s mostly used to gauge market sentiment before listing.
Trading IPO shares in the grey market involves informal agreements to buy or sell shares before official listing often at a premium or discount. However these trades are unregulated and carry significant risks.
Types of trading in the grey market include trading of IPO application rights, unofficial share transfers before listing and premium trading based on expected demand. These trades happen outside official exchanges.
These trades are unofficial and not regulated by SEBI.
With regard to the grey market, there are 3 market rate types of major significance:
GMP can be either negative or positive. If the GMP is positive i.e. higher than the IPO issue price, it indicates the IPO may have a high listing and perform great after listing. Conversely a lower GMP indicates that investors are not confident of the stocks doing well after listing and hence the listing may be done at a discounted price.
Let us understand the implication of high or low GMP with examples:
Say the issue price of an IPO is Rs 500 and the GMP is 200. A grey market buyer, A, is thus willing to buy the shares at Rs 700. Say, there is an IPO applicant, B, who has 15 shares to sell in the grey market. B submits an application for the grey market IPO of Rs 7500 (15 x 500). So the grey market IPO buyer A will pay Rs 10,500 (700 x 15) for an IPO application value of Rs 7500.
| Now, suppose when the shares are listed on the exchange, the listing price is set at Rs 1000, then
Profit for buyer A of the IPO shares = Rs (15,000 – 10,500) = Rs 4500 Profit for seller B of the IPO shares = Rs (10500 – 7500) = Rs 3000 |
Considering the examples discussed above, say the listing price is set at Rs 500.
| With a listing price of Rs 500, the total amount for 15 bids will be Rs 9000
Loss for buyer A of the IPO shares = Rs (9000 – 10,500) |
The second grey market rate that one should be aware of, is the Kostak rate. Kostak rate is a mutually agreed upon IPO application price. Following the Kostak rate the IPO applications are bought and sold at this decided rate, irrespective of the status of the allotment. Thus if even an applicant does not receive any allotment the buyer of the IPO shares has to pay the agreed-upon rate. This set amount that the buyer of an IPO application pays the seller of the IPO application is known as the Kostak Price. Note that the Kostak rate is the price of the complete IPO application not a price per share and this price is mutually agreed upon by the buyer and the seller.
Subject to Sauda is a guarded or extended version of the Kostak rate. If the seller of the IPO application receives allotment in the IPO, the buyer of the application agrees to pay a specified amount against the IPO application, subject to sauda. Thus, here payment depends on allotment, thereby offering a cushion, as payment is dependent on the confirmed allocation of shares, which is not there in the Kostak rate. Consequently, in general, the rates of Subject to Sauda are greater than the Kostak rates.
Until now we have discussed various market rates in the grey market and arrived at the conclusion that it is the GMP that determines whether a grey market applicant will earn gains or incur loss after the listing price is known. To have a better understanding of these two prices, given below is a table discussing the major differences between the two
| Aspect | Grey Market Premium (GMP) | Listing Price |
| Definition | Unofficial premium at which IPO shares trade before listing in the grey market | Official price at which IPO shares start trading on the stock exchange |
| Purpose | Indicates investor sentiment and demand for the IPO | Determines the actual market value when shares are listed |
| Influence | Reflects expected listing gains but is not binding | Based on final allotment and market conditions on listing day |
| Legality | Grey market trading is unofficial and not regulated | Listing price is official and regulated by stock exchanges |
GMP gives investors a sneak peek into market sentiment before a stock is listed. Here are its key benefits:
While GMP offers insights, it also has drawbacks that investors should be aware of:
Trading in the Grey Market Premium (GMP) carries significant risks and challenges due to its unregulated nature. Key issues include:
GMP in IPO serves as a useful indicator of investor sentiment and potential listing performance, but it should not be the sole factor guiding investment decisions. While grey market trading offers early insights and opportunities, it operates outside regulatory frameworks, making it risky and speculative. Investors must exercise caution, verify company fundamentals, and consider official data before participating in grey market deals. By balancing GMP analysis with proper research, investors can make informed choices and avoid unnecessary risks in IPO investments.
Yes, a higher GMP (Grey Market Premium) usually indicates strong demand and positive investor sentiment, suggesting the IPO may list at a higher price. However, it’s not a guaranteed indicator.
No, the grey market premium is an indicator of the listing price. However, the final listing price may not be in line with the price direction indicated by the GMP.
To sell your shares in GMP, you will have to find a local dealer who will assist you in selling the shares in the grey market. The grey market premium is usually the Kostak rate or Subject to sauda.
The GMP in IPO is calculated by taking into consideration factors like the subscription level, market sentiment, and demand & supply of the IPO shares.
GMP is not a sure shot indicator but however if it is tracked properly keeping in mind other factors, like the market sentiment, and any new market updates, then GMP can be a reliable indicator of the listing price.
The daily fluctuations in the demand for the stock determine the grey market premium. The day the IPO issue price is disclosed and is last modified before the listing is when the grey market opens. The listing price is estimated with the help of the GMP.
Though it is not guaranteed, a higher GMP indicates a higher listing price and vice-versa.
GMP information gives significant insight into the market dynamics and helps you understand how the shares can perform once they are listed on the exchange.