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Kostak vs GMP Calculator

Compare the grey-market kostak price with the per-share GMP to see which IPO application resale deal gives you the higher profit.

Calculator

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How this calculator works

Kostak profit = the flat kostak price quoted for the whole applicationGMP profit = GMP per share × lot sizeThe calculator shows which is higher and by how much

Kostak meaning is one of the most searched grey-market queries every IPO season. Kostak is a single flat price for your entire application (one lot), quoted by grey-market dealers, unlike GMP which is quoted per share. Multiply GMP by lot size and you can compare the two deals apple to apple, which is exactly what this tool does.

Kostak deals settle privately around allotment: if shares come your way, the buyer takes them and you keep the agreed premium. Quotes move daily with subscription momentum, and hot IPOs can see kostak jump several times in the final bidding days.

The risk side of is kostak trading safe: it is completely unregulated, with no exchange, no contract and no SEBI protection. If either side backs out after listing moves against them, there is no legal recourse. Treat any quote as information, not income.

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FAQs

What is kostak in IPO?

Kostak is the grey-market price for selling your entire IPO application (one lot) before listing, regardless of per-share GMP.

Which is better, kostak or GMP?

It depends on lot size and the quoted kostak. This calculator compares both so you can pick the higher payout.

Who decides the kostak price?

Grey-market dealers quote kostak based on demand for that IPO's applications. Like GMP, it moves daily through the bidding window.

When does a kostak deal settle?

Deals are privately settled around allotment and listing: if shares are allotted, the buyer takes the shares and the seller keeps the agreed kostak premium.

What is the difference between kostak and GMP?

Kostak prices the whole application (one lot) as a single deal, while GMP is quoted per share. Multiply GMP by lot size to compare the two fairly.

What are the risks of kostak deals?

Kostak dealing is unregulated — there is no exchange, no contract and no SEBI protection. If either side backs out, you have no legal recourse.

Disclaimer
Disclaimer: DostIpo is not a SEBI-registered investment adviser or research analyst. All data here is for information only, not investment advice or a recommendation to invest. GMP is an unofficial estimate. Market investments are subject to risks; read the RHP and consult a SEBI-registered adviser before investing.

Last updated: 14 Oct 2026, 02:25 IST