WorldBest IPO

IPO Listing Gain Calculator

Turn a grey market premium into an estimated listing price and profit per lot.

upper end of the price band
can be negative
GMP is not a forecast. It is an unofficial, unregulated price quoted in an informal market with no exchange oversight and no published volumes. It moves within hours and regularly differs from the actual listing price in both directions. Nothing on this page is a prediction — it is arithmetic on a number you supplied.

The arithmetic

Estimated listing price = issue price + GMP.
Estimated gain % = GMP ÷ issue price × 100.
Notional profit = GMP × lot size × lots.

The profit figure is before costs. Selling on listing day attracts STT, exchange charges, GST, stamp duty and depository charges — use the selling charges calculator for what you would actually keep.

How well has GMP actually predicted listings?

You can check that against real outcomes rather than taking anyone's word for it: our IPO screener holds the actual listing-day close for past issues, taken from official end-of-day exchange files.

Educational tool, not advice. Figures are arithmetic on the numbers you enter. Nothing here predicts an outcome or recommends an investment. Verify against your broker and the official registrar before acting.