How Accurate Is IPO GMP? We Checked Every Listing Against Reality
We recorded the last grey market premium before listing for every IPO we track, then checked it against the real listing price. The direction was almost always right. The magnitude tells two completely different stories for mainboard and SME.
This analysis reviews the official Red Herring Prospectus (RHP), historical peer valuations, current exchange subscription trends, and grey market premium indicators. All figures are verified against official BSE, NSE, and SEBI regulatory filings.
Everyone quotes the grey market premium before an IPO. Almost nobody checks it afterwards. So we did.
For every IPO we track, we record the GMP through the bidding window. Once the stock lists, we now capture the actual listing-day price. That lets us ask the question the number is really making a claim about: when GMP said an IPO would list X% up, how far up did it actually go?
Here is what our data shows so far. It is a live study — the sample grows every time another IPO lists — but even at this size the pattern is striking, and it is not the one most people assume.
How we measured it
For each listed IPO we compare two numbers:
- What GMP implied — the last grey market premium before listing, as a percentage of the issue price. A ₹60 GMP on a ₹400 issue implies a +15% listing.
- What actually happened — the real listing-day open, as a percentage gain over the issue price.
Both come from our own tracking: GMP recorded live through bidding, listing prices captured on debut. No estimates, no hindsight.
Finding 1: GMP almost always gets the direction right
Across every issue in the sample, the last GMP correctly signalled whether the stock would list at a premium or at a discount — bar one issue that GMP called flat and that listed flat. As a yes/no "will this list up?" indicator, GMP earned its reputation.
That is the part GMP does well, and it is genuinely useful: a strongly positive GMP has been a dependable sign that an issue will not list underwater.
Finding 2: on the actual number, mainboard and SME are different worlds
This is where it gets interesting. When we measure how far the real listing gain landed from what GMP implied, the two segments barely look like the same indicator.
Mainboard IPOs — GMP was remarkably accurate:
| Company | Issue price | GMP implied | Actually listed | Miss |
|---|---|---|---|---|
| Alpine Texworld | ₹105 | +1.0% | 0.0% | 1.0 pt |
| Knack Packaging | ₹170 | +7.6% | +10.6% | 3.0 pt |
| SBI Funds Management | ₹574 | +11.3% | +6.8% | 4.5 pt |
| Caliber Mining & Logistics | ₹424 | +14.2% | +18.0% | 3.8 pt |
| Laser Power & Infra | ₹214 | +18.2% | +16.8% | 1.4 pt |
| Kusumgar | ₹419 | +38.4% | +35.8% | 2.6 pt |
Median miss: 2.8 percentage points. For an unofficial, dealer-quoted number, landing that close to a real listing price is genuinely impressive.
SME IPOs — GMP was all over the place:
| Company | Issue price | GMP implied | Actually listed | Miss |
|---|---|---|---|---|
| Sotefin Bharat | ₹187 | +1.3% | +9.6% | 8.3 pt |
| Happy Steels | ₹66 | +15.2% | +3.0% | 12.2 pt |
| IC Electricals | ₹99 | +47.5% | +67.7% | 20.2 pt |
| Devson Catalyst | ₹118 | +41.5% | +66.2% | 24.7 pt |
| Millworks Technologies | ₹331 | +119.3% | +90.0% | 29.3 pt |
Median miss: 20.2 percentage points — over seven times worse than mainboard, and it misses in both directions.
Why the split makes sense
It is not random. The SME grey market is far thinner — a handful of trades can set the quote — so it is much easier to move and much noisier. The mainboard grey market is deeper and has real institutional demand behind it by listing day, which anchors the number closer to reality.
Notice the failure modes differ, too:
- The hottest issues overshot. Millworks implied a +119% pop and delivered +90% — still huge, but 29 points short. High-hype grey markets run ahead of themselves.
- Some quiet SME issues undershot badly. IC Electricals and Devson Catalyst each listed more than 20 points above what GMP implied. On a thin SME counter, GMP can miss demand entirely.
What this means before you apply
- Use GMP for direction, not for the number — especially on SME. "Will this list up?" is a question GMP answers well. "Exactly how much?" is one it answers well only for mainboard.
- Distrust extreme SME premiums most. The biggest premiums were the biggest misses. A +100% SME GMP is a statement about hype, and hype is exactly what fades between the last quote and the opening bell.
- On a large mainboard issue, GMP is a reasonable rough guide — but it is still a sentiment reading that can move with the market on listing day, not a guarantee.
If you want the mechanics behind the number, our guide to what GMP actually is covers where it comes from and why it moves.
The honest caveats
This is a small, live sample — a handful of mainboard and SME listings, growing every time another IPO debuts. The direction of the finding (mainboard tight, SME loose) is consistent and has a clear mechanical reason, but the exact medians will shift as the dataset grows. We update this study as new listings come in rather than freezing a single snapshot.
We also measure against the listing-day open. An issue can drift far from there in the days after — GMP was never trying to predict that, and neither are we here.
The short version: grey market premium is a good compass and a poor ruler. It reliably tells you which way an IPO will list. How far — trust it on the mainboard, and take it with a very large pinch of salt on SME.
Nothing here is investment advice. Grey market premium is an unofficial, unregulated indicator and we are not SEBI-registered analysts. This analysis uses our own tracked data, compares against the listing-day open, and is updated as more IPOs list. Past patterns do not predict future listings.
Authored by IPOSathi Research
Harshit is the Lead Primary Market Analyst at IPOSathi, tracking Indian initial public offerings, SME platforms, grey market movements, and corporate actions. All research is conducted independently with zero promoter compensation.
Frequently Asked Questions
Is IPO GMP accurate?+
In our data it is directionally very reliable — it correctly signalled a premium or a discount in almost every case — but its accuracy on the actual number depends heavily on the segment. For mainboard IPOs the last GMP before listing missed the real listing gain by a median of under 3 percentage points. For SME IPOs the median miss was over 20 points, in both directions.
Is GMP more reliable for mainboard or SME IPOs?+
Mainboard, by a wide margin, in our sample. Mainboard listing gains landed within a few points of what GMP implied. SME GMP was far noisier — it both overshot (Millworks: implied +119%, listed +90%) and undershot (IC Electricals: implied +48%, listed +68%) by large margins. SME grey markets are thinner, so a handful of trades move the quote.
Does a high GMP mean a big listing gain?+
Usually a gain, not necessarily a big one. A high GMP reliably pointed to a positive listing, but the largest premiums were also where GMP was least accurate — the hottest issues tended to list below their implied premium. Treat a very high GMP as a signal of strong demand, not a promise of that exact number.
How did you measure GMP accuracy?+
For every IPO we track, we record the grey market premium through the bidding window. After listing, we capture the actual listing-day open price. We then compare the listing gain the last GMP implied (issue price plus GMP, as a percentage) against the gain the stock actually delivered. This is our own tracked data, updated as more IPOs list.
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