What Is GMP in IPO, And How to Read It Without Getting Burned
GMP stands for Grey Market Premium. It’s the extra price people are willing to pay for an IPO’s shares in an unofficial market, before the stock actually lists on the exchange.
Author: Aadarsh Patel | EQMint
If a company’s IPO price band is ₹400 and the GMP is ₹120, the grey market is signalling that the stock might list around ₹520. Might. That word is doing a lot of work in this sentence.
Here’s the thing nobody making YouTube videos about GMP will tell you plainly: the grey market is unregulated, opaque and run by a handful of dealers in a few cities. The number you see on Telegram channels and IPO tracker websites is essentially a rumour with a decimal point.
That doesn’t mean GMP is useless. It just means you have to read it the way a poker player reads a tell. As a signal about what other people believe, with all the bias and bluffing that comes with it.
How the grey market actually works
Before an IPO lists, applicants who got allotment can sell their right to the shares to a buyer who didn’t get any. These deals happen through informal dealers, mostly concentrated in Gujarat, with smaller pockets in Mumbai, Delhi and a few other cities.
Two prices move in this market. One is the GMP itself, the premium over the issue price. The other is the Kostak rate, which is what a buyer pays an applicant just for the application, whether allotment comes through or not.
So if an investor applied for a Reliance Jio IPO at ₹400 and the Kostak is ₹800, someone will pay ₹800 to buy that application before allotment is even decided. If allotment comes through, the GMP kicks in on the actual shares.
None of this is on any exchange. None of it is reported to SEBI. The settlement happens in cash, between people who mostly know each other through phone numbers and word of mouth.
Why GMP moves the way it does
Three things push GMP up or down in the 7 to 10 days before listing.
Subscription numbers. When the QIB book gets oversubscribed 50 times on day 2, GMP usually jumps. When retail demand is weak, it slides.
Broader market mood. A Sensex rally lifts almost every IPO’s GMP. A correction kills it. The grey market is not insulated from sentiment, it’s basically made of sentiment.
Anchor investor list. If Norges Bank, GIC and a few quality mutual funds show up in the anchor book, dealers mark GMP up. If the anchor book is full of names nobody recognises, GMP drifts.
This is why GMP can swing 30% in 48 hours on a hot issue. It’s reacting to the same information any investor can see, just faster and with leverage from dealers who have skin in the game.
What GMP actually predicts (and what it doesn’t)
Look at the historical record. For mainboard IPOs in 2024 and 2025, GMP on the morning of listing predicted the listing price within a 15% range about two thirds of the time. That’s better than a coin flip. It’s nowhere close to a guarantee.
The misses are brutal. Some IPOs had GMPs of ₹200+ in the final two days, then listed flat or at a discount because a dealer cartel was propping the number to offload their own applications. This happens more often on smaller SME IPOs, where 4 or 5 dealers can move the whole market.
A useful frame: GMP tells you what informed people in a closed room think the listing will do. It doesn’t tell you what the stock is worth, what the business will do, or whether you should hold past day one.
How to read GMP without losing your shirt
There are 4 rules that tend to keep retail investors out of trouble on most IPOs.
Watch the trend. A GMP of ₹100 that’s been rising steadily for 5 days is a stronger signal than a GMP of ₹150 that spiked yesterday. Spikes get faded. Trends usually hold. The direction matters more than the absolute number on any given day.
Cross check with QIB subscription. If GMP is high but QIBs are barely subscribing, something is off. Institutions have research teams. Grey market dealers have phone networks. When they disagree, trust the institutions.
Ignore GMP entirely on SME IPOs unless the issue size is above ₹100 crore. The grey market on tiny SME issues is basically 3 guys on WhatsApp. The number means nothing.
Never apply because of GMP alone. Apply because the business makes sense, the valuation is defensible and the stock is worth holding at the issue price even if listing gets delayed by a month. Treat GMP as a tip from a stranger at a bar. Useful context. Nothing to bet money on.
What SEBI is doing about all this
The regulator is uncomfortable with how much retail money chases GMP. In 2024, SEBI floated the idea of a “when listed” platform, where pre listing trades would happen on the exchange itself, with proper price discovery and surveillance.
That platform hasn’t launched yet, but the direction is clear. Within the next 2 to 3 years, the grey market is likely to be replaced by something more transparent. Whether that kills the GMP signal or just regulates it remains to be seen.
For now, the grey market is what investors have. Read it carefully, don’t trust it completely and never apply for an IPO just because the number on Telegram looks juicy.
Quick FAQ
Is GMP legal in India? The grey market itself operates in a regulatory grey zone. SEBI doesn’t recognise it, but doesn’t actively prosecute participants either. The trades are unenforceable in court.
Where can you check today’s GMP? IPOWatch, Investorgain and a few Telegram channels track it. Treat any single source with suspicion. Cross check across 3 before believing the number.
Does a high GMP guarantee listing gains? No. It improves the odds, but plenty of high GMP IPOs have listed flat. Past performance, as the disclaimer goes, is not indicative of future results.
Should retail investors trade in the grey market? No. Settlement is informal, the buyer can disappear and there is no legal recourse. Stick to the regulated market.
EQMint is not a SEBI registered investment adviser. This article is for informational purposes only and is not investment advice.
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