The IPO pop is not the business

A friend pinged me before an IPO last week. "Grey market is showing 60, should I apply?"

Fair question. And the honest answer is that the grey market is usually right about the thing he was actually asking. It just was not the thing worth asking.

I pulled the 2025 mainboard listings to make the point. 65 of every 100 listed above their issue price. The median listing-day gain was 3.8%, down from 15.2% the year before, but still green. On day one it looked like a perfectly good year to be applying.

Then look at the same names in December. 59 of every 100 were trading below where they listed. The pop was real. It just had a short shelf life.

Here is the part that gets skipped. The grey market premium tracks the listing-day move tightly, somewhere around a 0.8 correlation in the studies I have seen. As a sentiment meter for the first hour of trading, it works. But its relationship with where the stock sits twelve months later is close to nothing. Same with oversubscription. Fifty times subscribed tells you the listing-day trade is crowded. It does not read the order book, the margins, or the promoter.

None of that makes the signal a liar. It makes it a signal for one specific horizon.

Applying for the pop and owning the business are two different trades. One is a sentiment bet that closes by lunch on listing day. The other is a five-year decision about cash flows. The expensive mistake is using the first one's number to make the second one's call, then being surprised in December.

First, what the grey market actually is

The grey market is not a market in any official sense. It is informal, off exchange dealing in IPO shares or allotment rights before they list. There is no exchange, no clearing corporation, no SEBI oversight and no recourse if the other side does not pay. The "premium" you see quoted is whatever someone in that chain says it is. That is why I do not quote grey market numbers here, and why nobody can audit them.

What you can audit is the official record. SEBI looked at exactly this question in a study published in September 2024: 144 mainboard IPOs listed between April 2021 and December 2023, with every allottee's holdings traced through the depositories.

Hot demand prices the first day

The cleanest table in that study sorts the 144 issues by how many times they were subscribed and shows the median listing day return for each group.

So the crowd is right about day one. Demand that heavy has to clear somewhere, and it clears in the opening auction. That is the one horizon the signal was built for.

And most allottees treat it as a day one trade

The same study then followed the shares. Excluding anchor investors, 54 percent of allotted shares by value were sold within a week of listing, and 72.6 percent within a year. Individuals sold 67.6 percent within a week when the listing return was above 20 percent, but only 23.3 percent when the return was negative.

Read those last two together. People bank the winners fast and sit on the losers. SEBI names it in the study: the disposition effect. So the investor who "applied for the long term" often ends up holding exactly the listings that disappointed, which is how a year of green listing days turns into a red December.

What applying is worth, in rupees

Here is the part the premium hides. A hot issue is also a hard one to get. When the retail book is oversubscribed, allotment is by lottery, one minimum lot per winning applicant. If most people apply for one lot, your chance of getting anything is roughly one divided by the times subscribed.

Take a minimum lot worth Rs 15,000, a retail book subscribed 50 times, and a 20 percent listing pop:

• The gain if you are allotted: 20 percent of Rs 15,000, so Rs 3,000.
• Your chance of allotment: about 1 in 50, so 2 percent.
• What one application is worth before you know the result: 2 percent of Rs 3,000, so about Rs 60.

The pop is real. Your expected share of it is tiny, and it shrinks as the subscription number that excited you grows.

The timeline you are actually trading

Since 1 December 2023, SEBI requires every public issue to list within three working days of the issue closing. That compresses the whole pop trade into less than a week.

1. T dayIssue closes

   Bids and UPI mandates accepted up to 5 pm.

2. T+1Basis of allotment

   Rejections finalised and the lottery basis approved by the evening.

3. T+2Shares credited, money unblocked

   Allotted shares reach demat accounts; unsuccessful bids are unblocked.

4. T+3Listing day

   A special pre-open call auction sets the opening price; normal trading starts at 10 am.

The 10 am open matters more than it looks. The listing price is found in a call auction where every buyer and seller meets at one price. By the time you can trade continuously, the crowd's view, the one the grey market was guessing at, is already in the price.

The free Learn module on IPOs and new listings covers book building, the investor quotas and lock ins, with a quiz and a certificate. And if you have ever been unable to sell on a wild morning, the day the market did not let you sell explains why.