What GMP claims to predict
Grey Market Premium is an informal, unofficial estimate of where an IPO might list, quoted by grey-market dealers before listing. A ₹85 GMP on a ₹300 issue implies an expected listing around ₹385. It is a real-time read of retail sentiment and short-term demand — useful as a mood gauge, but it is an opinion set by supply and demand among a small set of dealers, not a calculated or regulated figure.
The accuracy track record
Across recent cycles, GMP gets the direction right far more often than the magnitude. It reliably signals 'this will list at a premium' versus 'this will list flat/weak', but the exact percentage is frequently off by a wide margin — overstating gains on hyped issues and occasionally understating them on quietly strong ones. Treat the sign of GMP as informative and the precise number as a rough guess.
When GMP is most reliable
GMP tends to track reality best in the final 24-48 hours before listing, on large mainboard issues with deep grey-market participation and heavy subscription. By then sentiment has settled and the dealer quotes reflect genuine two-sided demand. A high, stable GMP going into listing on a heavily subscribed mainboard IPO is one of the more dependable signals available to retail.
When GMP misleads
GMP is least reliable early in the bidding window, on thinly traded SME issues, and whenever the number is moving sharply day to day. A GMP that spikes on hype but slides in the last 24 hours often signals cold feet and a weaker-than-advertised listing. Small-issue GMP can also be moved by a handful of trades, so the quote may not represent real broad demand at all.
Why GMP can be inflated
Because the grey market is informal and unregulated, quotes can be talked up — by operators holding inventory, by Telegram channels chasing engagement, or simply by thin volume making a single trade look like a trend. There is no audit trail. This is exactly why a single GMP source should never drive a decision; cross-check across multiple trackers and watch whether the number holds up as listing approaches.
GMP, subscription and anchors together
GMP is most trustworthy when it agrees with the regulated signals. Strong QIB subscription, a marquee anchor list, and a healthy retail multiple alongside a firm GMP is a genuinely positive setup. A high GMP with weak QIB interest is a warning — sentiment is running ahead of institutional conviction. When GMP and the official data disagree, trust the official data.
How to use GMP sensibly
Use GMP as one input among several, never as a buy/sell trigger on its own. Combine it with valuation versus listed peers, subscription levels, the anchor book, and your own goals. Verify across sources, weight the last-day figure most, and remember it tells you nothing about the company's fundamentals. For the full mechanics, see our 'What is IPO GMP' guide.
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