By ipomarket.in Editorial Team · Last reviewed: 2026-10-13
Disclaimer: This article is for informational purposes only and does not constitute investment advice. IPO investments are subject to market risks. Please read the offer document carefully and consult a SEBI-registered investment advisor before investing.
If you have browsed the IPO calendar lately, you will have noticed two very different kinds of listings: large, familiar companies arriving on the main exchanges, and a steady stream of smaller firms listing on dedicated SME platforms. Both are IPOs, both are regulated by SEBI, but they operate under separate rulebooks with different eligibility bars, application sizes and risk profiles. Understanding the gap matters because the money, the liquidity and the scrutiny involved are not the same.
This guide breaks down how mainboard IPOs and SME IPOs differ in 2026, using the current regulatory framework.
The two frameworks in brief
Mainboard IPOs are meant for larger, established companies that list on the main boards of the NSE and BSE. SME IPOs serve smaller enterprises and list on separate platforms — NSE Emerge and BSE SME ([c20]). They are genuinely different exchanges within the same groups, not just a label.
The size thresholds set the tone. A mainboard IPO requires minimum post-issue paid-up capital of ₹10 crore. SME platforms are built for companies with post-issue paid-up capital up to ₹25 crore. In short, SME platforms catch firms that are too small to clear the mainboard bar but still want public capital and a listing.
Eligibility: who can list where
The financial hurdles are where the two diverge most sharply.
Mainboard (profitability route): A company needs minimum net tangible assets of ₹3 crore in each of the last three years, and average operating profit of at least ₹15 crore in three of the last five years. These are substantial numbers that filter for businesses with a real track record.
SME route: The bar is lower but no longer trivial. Under reforms that took effect in March 2025, an SME applicant must demonstrate operating profit (EBITDA) of at least ₹1 crore in two of the preceding three financial years. SME companies also need a minimum net worth of ₹1 crore for the preceding two financial years.
That 2025 tightening is important context: SEBI closed the door on loss-making shell-like businesses rushing to list on SME platforms. If you are new to reading company accounts, our walkthrough of how to analyse IPO financials covers the metrics these rules hinge on.
Regulatory scrutiny: who checks the paperwork
This is a difference many retail investors overlook. For mainboard IPOs, SEBI directly reviews the draft offer documents. For SME IPOs, the offer documents are vetted by the exchange, with SEBI in a supervisory role rather than doing the front-line review ([c5]).
The practical takeaway is not that SME documents are unregulated — they are — but that the depth of direct SEBI examination differs. Combined with earlier-stage businesses, this is one reason SME IPOs are generally considered higher risk than mainboard IPOs ([c19]). Reading the offer document yourself matters more, not less, in the SME space; see our primer on what a DRHP is and how to read it.
What it costs you to apply
For retail investors, the entry ticket is one of the starkest contrasts.
- Mainboard: The minimum retail application is roughly ₹14,000–₹15,000 per lot.
- SME: The minimum application size is above ₹2 lakh, requiring a minimum of two lots, effective from July 2025.
So an SME IPO is not a small-ticket affair for retail applicants despite the "small" in the name. A single application starts above ₹2 lakh, which concentrates your capital in one early-stage company. That alone changes the risk maths.
Allottees, underwriting and market making
Mainboard IPOs require a minimum of 1,000 allottees. SME IPOs require a minimum of just 50 investors ([c7]). Fewer holders typically means a narrower shareholder base after listing.
SME IPOs carry a mandatory 100% underwriting requirement, with the merchant banker underwriting at least 15% from its own account ([c6]). There is also mandatory market making for a minimum of three years post-listing — a mechanism meant to provide some baseline trading support for otherwise thinly traded SME stocks.
Even with market making, SME liquidity is typically lower, bid-ask spreads are wider and price volatility is higher than on the mainboard ([c23]). If you buy in, exiting at a fair price can be harder than on a liquid mainboard counter.
Fund-use and OFS limits on SME issues
SEBI puts tighter guardrails on how SME issuers can use and structure proceeds:
- General corporate purposes (GCP) funds cannot exceed 15% of the amount raised or ₹10 crore, whichever is lower ([c21]).
- Offer for Sale is capped at 20% of the total SME issue size, and an individual selling shareholder cannot offload more than 50% of their pre-issue holdings ([c10]).
These limits are designed to ensure SME money mostly funds the business rather than acting as an exit vehicle for existing owners.
Disclosure and lock-ins after listing
Mainboard companies must disclose quarterly financial results. SME firms are exempt from quarterly reporting and present accounts half-yearly instead ([c9]). For an investor, that means fewer, less frequent data points to track an SME holding.
Promoter lock-ins also differ: three years for mainboard IPOs versus one year for SME IPOs from the allotment date. A shorter lock-in means promoter supply can hit the market sooner. For a fuller picture of how lock-ins work, see our explainer on IPO lock-in periods for promoters and anchor investors.
The SME migration path
SME listings are not a dead end. Companies that grow and meet mainboard criteria can migrate to the main board. Reportedly, around 360 SME-listed companies had migrated to the mainboard as of mid-2026. Treat that figure as a reported number rather than an official tally.
Activity on SME platforms has been heavy. Reportedly, roughly 268 SME IPOs raised approximately ₹12,000 crore in calendar year 2025, according to industry data — a sign of how active this corner of the market has become.
Reforms on the horizon
The SME framework may expand. According to reports from August 2026, SEBI is considering raising the paid-up capital limit for SME platforms from ₹25 crore to ₹100 crore, and raising the market cap limit to ₹4,000 crore, as part of proposed reforms. These are proposals under consideration, not confirmed rules, so the current ₹25 crore limit remains the operative figure until any change is formally notified.
How to think about the choice
Neither category is "better" in the abstract. Mainboard IPOs give you larger, more scrutinised, more liquid companies with quarterly reporting and longer promoter lock-ins. SME IPOs offer access to earlier-stage businesses, but with lighter direct SEBI review, a much higher minimum application, thinner liquidity and more volatility.
The tax treatment also differs between the two, which is worth factoring in — our note on SME vs mainboard IPO taxation covers that ground.
FAQ
What is the main difference between a mainboard and an SME IPO?
Scale and oversight. Mainboard IPOs are for larger companies (minimum ₹10 crore post-issue capital) that list on the NSE and BSE main boards with direct SEBI review of documents. SME IPOs serve smaller firms (post-issue capital up to ₹25 crore) listing on NSE Emerge or BSE SME, where the exchange vets documents with SEBI supervising.
How much money do I need to apply to an SME IPO?
Since July 2025, the minimum SME application size is above ₹2 lakh, requiring at least two lots. That is far higher than the roughly ₹14,000–₹15,000 minimum per lot for a mainboard retail application.
Are SME IPOs riskier than mainboard IPOs?
Generally yes. SME IPOs typically involve earlier-stage businesses, lighter direct SEBI scrutiny and lower post-listing liquidity, with wider bid-ask spreads and higher price volatility. Promoter lock-in is also shorter at one year versus three years for mainboard.
Can an SME-listed company move to the mainboard?
Yes. SME companies that grow and meet mainboard eligibility criteria can migrate. Reportedly, around 360 SME-listed companies had migrated to the mainboard as of mid-2026.
Is SEBI changing the SME rules?
According to August 2026 reports, SEBI is considering raising the SME paid-up capital limit from ₹25 crore to ₹100 crore and the market cap limit to ₹4,000 crore. These are proposals under consideration and not yet confirmed rules.
Last reviewed: 2026-10-13 by the ipomarket.in Editorial Team.