Grey Market Premium (GMP) is the price at which IPO shares are traded unofficially before they are listed on the stock exchange. It indicates the potential listing gain or loss.

How is allotment probability calculated?

In the retail category, allotment is done via a lottery system if oversubscribed. The probability is roughly 1 divided by the subscription factor (e.g., 1/10 if 10x oversubscribed).

Does GMP guarantee listing gains?

No, GMP is only an indicator based on unofficial trades. The actual listing price depends on the final market sentiment, institutional demand, and global market conditions on the day of listing.

IPO GMP & Allotment Calculator

Calculate expected listing gains and retail allotment probability based on Grey Market Premium (GMP) and subscription data.

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Documentation

Quick Summary: IPO GMP & Allotment Calculator

An IPO GMP calculator estimates listing gains by adding the Grey Market Premium (GMP) to the issue price. In FY 2026-27, retail allotment probability is determined by the lottery system; for example, if an IPO is 50x oversubscribed in the retail category, your individual chance of allotment is 1 in 50 (2%).

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Regulatory Disclaimer

Last verified May 2026

Statutory Disclosure

Nature:Calculator platform and is NOT a SEBI-registered Investment Adviser. All calculations are indicative.

Risk:"Investments in securities market are subject to market risks. Read all related documents carefully before investing."

Consult a SEBI-registered IA or CA for personalised advice.

9 out of 10 traders in F&O incurred net losses (SEBI 2023). Tax estimates based on IT Act 2025. Trezoriq is not liable for financial decisions based on results.