IPO basics

Mainboard vs SME IPOs: Key Differences

How SME IPOs on BSE SME and NSE Emerge differ from mainboard IPOs — eligibility, application size, liquidity, disclosure and listing rules.

By Niva Market Watch Editorial · Published 30 Sep 2026

Indian IPOs come in two broad types: mainboard issues, which list on the main segments of NSE and BSE, and SME issues, which list on the exchanges' platforms for small and medium enterprises — BSE SME and NSE Emerge. They follow different chapters of SEBI's ICDR Regulations and behave differently after listing. This guide sets out the practical differences.

At a glance

	Mainboard IPO	SME IPO
Where it lists	NSE and/or BSE main segment	BSE SME or NSE Emerge
Who reviews the offer document	SEBI issues observations on the DRHP	The SME exchange reviews it; SEBI does not issue observations
Typical issue size	Tens to thousands of crores	Usually a few crores to around a hundred crore
Minimum application	One lot, sized at roughly ₹10,000–15,000	Much larger — historically at least ₹1 lakh, and under SEBI's 2025 changes, two lots
Underwriting	Depends on the issue	Must be fully underwritten
Market making	Not required	Mandatory for a period after listing, to provide two-way quotes
Trading after listing	Usually continuous, liquid for larger issues	Often thin; for a period, trading may be in larger minimum lots

Specific thresholds change as SEBI and the exchanges revise their rules. Always check the RHP of the issue you are looking at for its minimum application and listing details.

Review and disclosure

For a mainboard IPO, SEBI reviews the draft offer document and issues observations before the company can launch. For an SME IPO the draft is filed with and reviewed by the SME exchange. SME issuers also have lighter ongoing disclosure obligations after listing — for example, half-yearly rather than quarterly financial results. Less review and less frequent disclosure mean an SME investor has less information to work with, and has to rely more on reading the offer document carefully.

Application size and who applies

Because the minimum application is much larger, SME IPOs are not built for small-ticket investors in the way mainboard issues are. SEBI tightened SME rules in 2025 — including raising the minimum application to two lots, capping the offer-for-sale portion, requiring a track record of operating profit, and aligning how shares are allotted to non-institutional investors with the mainboard method — after concern about speculative activity and very high subscription numbers in small issues.

Liquidity and listing-day behaviour

Thin trading. Many SME stocks trade in small volumes. It can be hard to sell a holding without moving the price.
Market makers are required to provide buy and sell quotes for a period, but that does not guarantee a price you would accept.
Listing-day price limits. Exchanges have introduced additional controls on how far an SME IPO's opening price can move from the issue price. See how the listing price is determined.

Subscription numbers

Small issue sizes mean SME IPOs can report very large subscription multiples — hundreds of times — from relatively modest amounts of money. A high multiple in a ₹20 crore issue represents far less demand in rupee terms than the same multiple in a ₹2,000 crore issue. When comparing, look at the amount bid as well as the multiple; see how subscription works.

Moving to the main board

An SME-listed company can later migrate to the main board if it meets the exchange's eligibility conditions, such as size and track record. Migration is not automatic and cannot be assumed when assessing an SME issue.

How our pages label segments

On Niva Market Watch, an issue is described as SME only when the exchange listing says so. Some data sources report SME issues simply as “NSE” or “BSE”, so the IPO page and the offer document are the places to confirm the platform.

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