Why GMP Changes Every Day
Grey market premium for an active IPO can change dramatically from morning to evening on the same day. Understanding the drivers of these intraday and day-over-day movements helps you make better application and trading decisions.
GMP is driven by the intersection of supply (available applications and allotted shares) and demand (buyers willing to pay premium for confirmed IPO shares). Any event that shifts either side causes an immediate GMP move.
Morning GMP: Setting the Day's Tone
Grey market operators in India typically open for business by 8–9AM IST. The morning GMP reflects overnight sentiment — news about the company, broader market futures, and any analyst reports that broke after the previous day's close. For IPOs in their subscription window, morning GMP also absorbs the previous day's subscription data published by BSE/NSE at end-of-day.
The morning GMP on the final subscription day is the single most-watched number, as it incorporates three days of subscription data and sets expectations for the day's final QIB rush.
How Subscription Data Drives Same-Day GMP Changes
BSE and NSE publish subscription data at roughly 11AM, 1PM, and 5PM each day of the subscription window. Each update can trigger immediate GMP moves:
- If the 11AM update shows retail at 3x on day 1, GMP usually rises — this is ahead of typical pace for a well-received IPO.
- If day-3 morning shows NII (HNI) at only 0.8x, GMP often drops as the market infers weak overall demand from the category that usually drives last-minute oversubscription.
- If QIB (institutional) fills to 100x on the final day's last-minute rush, GMP can jump ₹50–100 within hours.
Post-Listing Day GMP: Why It Drops to Zero
Once a stock lists and begins trading on exchanges, GMP ceases to exist — the grey market served its purpose as a price discovery mechanism. Any quotes you see after listing are simply asking prices from people who want to sell allotted shares outside the exchange, and these are not meaningful GMP figures.
For listed stocks, all price discovery happens on the exchange in real time. Track them via NSE/BSE directly.
Reading the Daily GMP Table on GMPIpoWatch
The GMPIpoWatch homepage shows a live GMP table with columns for current GMP, issue price, estimated listing price, and percentage gain for all active IPOs. The table refreshes throughout the day. Sort by "GMP %" to quickly identify which IPO has the strongest grey market sentiment on any given day. Use the individual IPO pages for historical GMP charts and subscription data context.
For the most accurate daily reading, check at three points: 9AM (overnight data), 2PM (midday subscription updates), and after 6PM (final day subscription data from exchanges). This three-point check gives you the full picture of where GMP is heading.
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