What is Grey Market Premium (GMP)?
The Grey Market Premium (GMP) is the price at which IPO shares are unofficially traded in an over-the-counter (OTC) market before they are formally listed on recognized stock exchanges (NSE or BSE).
If an upcoming IPO has an issue price band of âš200 per share and traders are paying a premium of âš50 per share in the grey market, the GMP is âš50, and the estimated listing price is calculated as:
Estimated Listing Price = Issue Price + GMP = âš200 + âš50 = âš250 (+25.0%)
Understanding Kostak Rate and Subject to Sauda
In addition to GMP per share, two other terms are widely used in grey market circles:
- Kostak Rate: A fixed lump sum amount paid to an IPO applicant for selling their complete application before allotment, irrespective of whether they receive share allotment or not.
- Subject to Sauda (Subject to Allotment): An agreement where the buyer pays a predetermined profit amount to the applicant ONLY IF the application secures allotment. If no shares are allotted, the transaction is void.
Why GMP is NOT a Guarantee of Listing Gains
Retail investors should recognize that GMP is an unofficial market sentiment indicator with zero regulatory backing:
- Market Volatility: A sharp fall in broad market indices (Nifty, Sensex) before listing day can erase positive GMP overnight.
- Low Volume & Manipulation: Grey market volumes are unregulated and can be influenced by small cartels seeking to generate false retail hype.
- SEBI Warnings: SEBI does not endorse, recognize, or supervise grey market transactions. Dealing in unofficial cash trades is unlawful.
Frequently Asked Questions
Yes, if broader market sentiment deteriorates or institutional subscription remains weak, GMP can drop to zero or turn negative, indicating an estimated discount listing.
You can track real-time Mainboard and SME IPO GMP movements with timestamps on our Live IPO & GMP Tracker.