- Home
- Articles
- Personal finance
- IPO GMP meaning: what grey market premium is and how far to trust it
IPO GMP meaning: what grey market premium is and how far to trust it
GMP (grey market premium) is the unofficial price at which IPO shares trade before listing. How GMP is calculated, kostak and subject-to-sauda rates, real examples, risks and why it isn't legal or reliable.
On this page
Quick answer: GMP (grey market premium) is the unofficial extra price that people are willing to pay for an IPO's shares before they list on the stock exchange. If an IPO is priced at ₹500 and the GMP is ₹100, the grey market expects it to list around ₹600. GMP is traded outside SEBI's rules, can change by the hour, and is often wrong — use it as a rough mood indicator, never as a reason to invest.
Key takeaways
- Expected listing price = upper price band + GMP.
- GMP is unregulated — there's no legal protection if a grey market deal goes wrong.
- GMP often falls sharply in the last days before listing, or after weak markets.
- Kostak and subject-to-sauda are grey market prices for an IPO application, not shares.
- Judge an IPO by the company's business, valuation and RHP — not GMP.
How GMP works — an example
| Detail | Value |
|---|---|
| IPO upper price band | ₹1,119 |
| GMP a day before listing | ₹247 |
| Expected listing price | ₹1,119 + ₹247 = ₹1,366 |
| Actual listing price | ₹1,358 |
| Expected gain per share | ₹247 (about 22%) |
Formula: Expected listing price = Upper price band + GMP. Expected listing gain % = (GMP ÷ upper price band) × 100.
Example: Jio Platforms' IPO was priced at ₹1,119. A day before listing, a GMP of about ₹247 pointed to roughly ₹1,366. The shares actually listed at ₹1,358 on 28 October 2026 — close, but a little below the grey market's guess. Follow the stock on our Jio Platforms live page.
What is the grey market?
It's an informal, over-the-counter market where dealers and investors agree to buy or sell IPO shares (or applications) before listing, usually through brokers who work outside the exchange. Deals are on trust — no exchange, no clearing house, no SEBI protection.
GMP, kostak and subject-to-sauda
| Term | What it means | Example |
|---|---|---|
| GMP | Premium per share above the issue price | GMP ₹100 = dealer pays ₹100 over issue price per share |
| Kostak rate | A fixed amount paid for your whole application, whether you get shares or not | Kostak ₹800 — you get ₹800 even if not allotted |
| Subject-to-sauda (STS) | A fixed amount paid only if you get an allotment | STS ₹2,000 — paid only if shares are allotted |
In these deals, the applicant agrees to sell allotted shares to the dealer at listing. Because nothing is legally enforceable, people can lose money if the other side backs out.
Why GMP can be misleading
- Thin trading: a few dealers can push GMP up or down.
- Hype: GMP often rises with subscription news and social media buzz.
- Market mood: a weak Nifty day before listing can cut GMP quickly.
- Last-day drop: GMP regularly falls in the final 1–2 days.
- No official source: websites that publish GMP collect it from dealers; numbers differ between sites.
Is GMP legal?
Grey market trading isn't recognised or regulated by SEBI. Trading in shares before listing outside the exchange isn't permitted under securities rules, and grey market deals have no legal protection. Many sites report GMP as market information, but taking part in grey market deals is risky and not advisable.
What to check instead of GMP
- Red Herring Prospectus (RHP) — on SEBI, NSE and BSE websites: business, risks, use of money.
- Valuation — price-to-earnings compared with listed peers.
- Financials — revenue and profit growth over 3 years, debt.
- Subscription data — especially QIB (institutional) demand, published live by NSE/BSE.
- Promoters and offer type — fresh issue (money to the company) vs offer for sale (existing owners selling).
Applying for an IPO and checking allotment
- Apply through your broker's app or bank net banking using UPI mandate or ASBA.
- Retail investors can bid up to ₹2 lakh.
- After the issue closes, check allotment on the registrar's site, BSE or NSE — see how to check IPO allotment status.
Frequently asked questions
What does GMP mean in an IPO?
Grey market premium — the unofficial premium over the issue price that people pay for IPO shares before listing.
How is the expected listing price calculated from GMP?
Upper price band plus GMP. For a ₹500 band and ₹100 GMP, the expected listing is about ₹600.
Is GMP accurate?
Not reliably. It's often close for popular IPOs but can be far off, especially if the market falls before listing.
What is a kostak rate?
A fixed amount paid in the grey market for an IPO application, whether or not shares are allotted.
What is subject-to-sauda?
A fixed amount paid in the grey market only if the application gets an allotment.
Is grey market trading legal in India?
It isn't regulated by SEBI and deals have no legal protection, so it's risky to take part.
Can GMP be negative?
Yes. A negative GMP means the grey market expects the shares to list below the issue price.