What is IPO GMP?
IPO GMP, short for Grey Market Premium, is the extra price investors are unofficially willing to pay for IPO shares before those shares are officially listed on the NSE or BSE. It trades in what's called the "grey market" — an unregulated, informal market that exists purely on demand and sentiment, separate from the official stock exchanges.
A positive GMP usually signals strong investor interest in an IPO, while a GMP near zero or negative suggests weaker demand. It's a widely watched number, but it's important to treat it as a sentiment indicator, not a price prediction.
How is GMP Calculated?
The grey market GMP itself isn't calculated by any formula — it's simply the price at which buyers and sellers agree to trade IPO applications unofficially, similar to how any market price forms through supply and demand.
What you can calculate is the estimated listing price using GMP:
Estimated Listing Price = IPO Issue Price + GMP
For example, if an IPO is priced at ₹200 and the current GMP is ₹40, the shares might list around ₹240 — an estimated gain of 20%. This is only an estimate based on current sentiment; the actual listing price can differ significantly depending on market conditions on listing day.
What Factors Influence GMP?
- Company fundamentals — strong financials, growth prospects and a well-known promoter group tend to push GMP higher
- Subscription demand — heavy oversubscription, especially from QIBs and HNIs, usually correlates with a rising GMP
- Overall market mood — GMP across most IPOs tends to rise in a bullish market and fall when markets are nervous
- Sector sentiment — IPOs in "hot" sectors (like renewable energy or fintech) often see inflated GMP purely from thematic interest
Kostak Rate & Subject to Sauda Explained
Kostak Rate is a fixed amount someone pays to buy your IPO application in the grey market — before allotment is even known. You get paid this fixed amount whether or not your application actually receives an allotment, which makes it a way to lock in a guaranteed (if modest) profit.
Subject to Sauda, on the other hand, is conditional — the deal only goes through if the application receives an actual allotment. If it does, the seller gets a larger, pre-agreed profit; if it doesn't, the deal is simply cancelled.
Is Trading on GMP Safe?
The grey market operates completely outside SEBI's regulatory oversight, which means there's no official recourse if a deal goes wrong. GMP figures themselves are also not verified by any exchange or regulator — they're informally tracked by brokers and market participants.
Our recommendation: use GMP as one small data point alongside subscription numbers and company fundamentals, not as your sole reason to apply for an IPO.