If you follow Indian IPOs, you have seen the term GMP everywhere. It is one of the most searched numbers in the run-up to any issue — yet it is also one of the most misunderstood. This guide explains what grey market premium actually is, how to read it, and where it falls short.
What GMP means
Grey market premium (GMP) is the extra amount, over the issue price, at which an IPO's shares change hands in the unofficial "grey market" before they are listed on the exchange. It is quoted in rupees per share.
If an IPO is priced at ₹500 and the GMP is ₹100, it means buyers in the grey market are willing to pay roughly ₹600 for the share ahead of listing. That implies the market expects the stock to list somewhere around ₹600.
How the expected listing price is calculated
The arithmetic is simple:
Expected listing price = Issue price (upper band) + GMP
So a ₹500 issue with a ₹100 GMP has an expected listing price of ₹600, or a 20% expected listing gain. On every IPO page on ipostation you will see this figure computed for you next to the live IPO GMP table.
Where GMP comes from
The grey market is an informal, off-exchange network of dealers and investors who trade IPO applications and shares before listing. There is no official body, no regulator-sanctioned price, and no public order book. The premium is simply what a handful of dealers say it is on a given day — which is why it can swing sharply within hours, especially in the 24–48 hours before listing.
The important caveat
GMP is an unofficial figure sourced from grey market dealers. It is a sentiment indicator, not a guarantee of the listing price, and nothing here is investment advice. Plenty of IPOs have listed well below a strong GMP, and a few have surprised on the upside after a weak one. Treat it as one input among many — alongside the company's subscription numbers, financials and the fresh-issue-versus-OFS structure.
How to use it sensibly
- Watch the trend, not a single reading. A GMP that is steadily rising through the subscription window tells you more than one snapshot.
- Cross-check with subscription. A high GMP with weak institutional (QIB) demand is worth a second look.
- Remember the window. GMP is most active between the issue closing and the listing day, and it is thin or zero far ahead of the open.
You can track the live, timestamped grey market premium for every open, upcoming and recently closed IPO on our IPO GMP page, and see the day-by-day history on each individual IPO's page.