GMP vs Actual Listing — The Reality
Grey market premium is widely watched but its predictive accuracy varies significantly depending on market conditions and IPO type.
When GMP is Reliable
GMP tends to be a reasonable indicator when:
- The IPO is heavily subscribed (50×+ across all categories)
- GMP has been stable for 3-4 days before listing
- Market conditions are stable (no sudden FII sell-off)
- The issuer's business is well-understood by the market
When GMP Fails
GMP frequently overestimates listing gains when:
- Market correction: A sudden Nifty fall on listing day overrides IPO-specific enthusiasm.
- Weak anchor selloff: If anchor investors (lock-in ends after 30 days) are large sellers, pressure builds.
- Small float: Thinly traded SME IPOs see GMP manipulated by a few operators.
- Pre-open orders: Large sell orders in the pre-open session compress the listing price.
Average Accuracy (Historical)
Based on mainboard IPOs 2022-2025:
- GMP within ±5 percentage points of actual listing gain: ~55% of IPOs
- GMP overestimated listing gain: ~30% of cases
- GMP underestimated listing gain: ~15% of cases
IPOpulse tracks GMP accuracy on our GMP Accuracy Scorecard — comparing last-day GMP vs actual listing price for every listed IPO.
Rule of Thumb
Treat GMP as a sentiment indicator, not a price prediction. High GMP (30%+) with heavy QIB demand is historically bullish. Low GMP under 5% often means a flat or negative listing. Negative GMP is a strong warning sign.