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What is IPO GMP?

4 min read
Dec 1, 2025
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In the ever-evolving world of stock markets, Initial Public Offerings (IPOs) represent one of the most exciting avenues for investors. As companies transition from private to public status, the anticipation surrounding their debut can greatly influence their perceived value. One key metric that investors often consider in this context is the Grey Market Premium (GMP).

In this blog, we’ll delve into what IPO GMP is and why it holds significance for both investors and the broader market landscape. Let's find out what is GMP in stock market, or what is grey market IPO in detail.

What is grey market in an IPO?

Let's begin by understanding what is grey market in IPO.

A grey market in an Initial Public Offering (IPO) refers to an unofficial platform where you can buy and sell IPO shares or applications before the shares are officially listed on the stock exchange. It operates outside the formal regulatory system and is not legally recognised.

What is a grey market stock?

A grey market stock refers to shares traded informally before their official listing on a stock exchange. These transactions occur without regulatory oversight. Investors use this market to gauge interest in an upcoming IPO. Prices in the grey market often indicate expected listing performance.

However, such trades rely more on trust and informal deals, which means they are riskier. The prices here can change depending on how investors feel, the demand for the IPO, and the buzz around the market. Even though it’s risky, keeping an eye on grey market stocks can give you an idea of how the shares might perform once they are officially listed.

Types of trading in the grey market

1. Pre-IPO trading: This involves buying and selling shares before the IPO is officially listed on the stock exchange. Traders speculate on the expected listing price based on demand.

2 Application trading: Investors trade IPO application forms, essentially selling their right to apply for shares in the IPO. This gives an early chance to profit from the IPO listing.

How are IPO shares traded in the grey marke

  • Broker networks: The grey market operates through informal networks of brokers who connect buyers with sellers. These brokers typically charge a commission for facilitating these transactions.
  • Trust-based system: Since there's no regulatory oversight, transactions rely entirely on trust between parties. Payments are often made in cash to maintain anonymity.
  • Application trading: You can sell your entire IPO application before allotment results. The buyer pays a premium to acquire the application, betting on receiving an allotment.
  • Share certificate trading: Post-allotment but pre-listing, you can sell your allotted shares at a premium. The actual transfer happens after listing, but the deal is struck beforehand.
  • Price discovery: Prices are determined purely by demand and supply. Popular IPOs with high subscription rates typically command higher premiums.

How does IPO grey market work?

A key metric in this market is the grey market premium (GMP), which indicates the price difference between the IPO's issue price and the price at which it is trading in the grey market. A positive GMP suggests strong investor demand, while a negative GMP indicates weak interest. For instance, if an IPO is priced at ₹100 and trades at ₹130 in the grey market, the Grey market profit is ₹30, reflecting bullish sentiment.

Investors also engage in trading IPO applications, known as the 'Kostak' rate, where one sells their application for a fixed profit, transferring any shares to the buyer upon listing. While the grey market offers insights into investor sentiment and potential listing prices, it carries significant risks due to its unregulated nature and lack of legal recourse.

What is the grey market premium?

So, what is grey market premium in IPO?

Grey market premium (GMP) is the extra money investors are willing to pay for IPO shares before they officially start trading. It shows how people expect the share to perform — whether it will make a profit or a loss. For example, if an IPO is priced at ₹100 but sells for ₹140 in the grey market, the GMP is ₹40.

GMP changes daily based on market mood, how many people applied for the IPO, and the overall market conditions. A high GMP suggests strong demand and possible profit, while a negative GMP means a weak listing.

How to calculate the GMP or Grey Market Premium?

To know what is grey market premium IPO, simply use the formula and calculations mentioned below:

  • Basic formula: GMP = grey market price - IPO upper price band
    • For example, if an IPO's price band is ₹95-100 and it's trading at ₹130 in the grey market, the Grey Market Profit is ₹30 (₹130 - ₹100).
  • Percentage calculation: To understand the potential listing gain percentage:
    • GMP% = (GMP ÷ IPO upper price band) × 100
    • In our example: (₹30 ÷ ₹100) × 100 = 30% expected listing gain?
  • Expected listing price: You can estimate the potential listing price by adding the GMP to the issue price:
    • Expected listing price = IPO upper price band + GMP
    • In our example: ₹100 + ₹30 = ₹130
  • Negative GMP: Sometimes, GMP can be negative, indicating expected listing below the issue price:
    • If the grey market price is ₹90 for an IPO priced at ₹100, the GMP is -₹10, suggesting a potential 10% discount on the listing.
  • Tracking changes: GMP fluctuates daily:
    • If GMP increases from ₹30 to ₹40, it indicates improving sentiment.
    • If GMP decreases from ₹30 to ₹20, it suggests waning enthusiasm.
  • Contextual analysis: Compare the GMP with subscription figures:
    • High subscription + high GMP = Strong indicator of listing gains
    • Low subscription + high GMP = Possibly manipulated grey market
  • Market correlation: Assess GMP in the context of overall market conditions:
    • In bullish markets, GMP tends to be higher across IPOs
    • In bearish markets, even good companies might have modest GMPs

Conclusion

Grey market premium in IPO is important for investors, but it should only be one of the many things to consider before investing. While a GMP can show market sentiments and possible listing gains, remember that the SEBI does not regulate it, so it’s best not to rely entirely on it for your investment decisions.

FAQs

What decides the IPO grey market price?

The IPO grey market price is decided by the unofficial demand and supply before the new company's stock is listed on the exchange. It reflects how excited investors are about the IPO based on factors like the company’s reputation, financial performance, market conditions, and expected listing gains.

How does GMP affect IPO listing price?

The GMP can influence the IPO listing price by reflecting investor sentiment before any official trading begins. A high GMP suggests strong demand and positive expectations, which can lead to a higher opening price when the stock is listed on the exchange. Conversely, a low or negative GMP may indicate weak interest, potentially resulting in a poor listing.

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