Companies in India can raise money from public investors through different stock-market platforms. Two commonly discussed routes are Mainboard IPOs and SME IPOs. Although both involve a public offering of shares, they differ in eligibility requirements, issue size, minimum application amounts, trading characteristics and the profile of companies that typically use them.
Understanding these differences is important for investors because an SME IPO should not simply be treated as a smaller version of a Mainboard IPO. The applicable rules, investor requirements and trading environment can be different.
What Is a Mainboard IPO?
A Mainboard IPO is a public issue through the principal listing platforms of recognised stock exchanges, such as the NSE Main Board or BSE Main Board.
Companies seeking mainboard listing generally need to satisfy the applicable SEBI and stock-exchange requirements. For example, NSE’s current eligibility criteria for an IPO include a post-issue paid-up equity capital of at least ₹10 crore and a market capitalisation of at least ₹25 crore, along with other conditions relating to track record, financial position and compliance.
Mainboard IPOs are commonly associated with companies that have reached a larger scale of operations, although company size and maturity can vary considerably.
What Is an SME IPO?
An SME IPO is a public issue by a company that qualifies to list on an SME platform, such as NSE Emerge or the relevant SME platform of BSE.
The SME platform is designed for smaller companies seeking access to public capital markets.
NSE’s current SME eligibility framework specifies, among other requirements, that the post-issue paid-up capital should not exceed ₹25 crore. It also includes conditions relating to operating profit, net worth, free cash flow, track record and other listing requirements.
The specific eligibility requirements can change through regulatory or exchange amendments, so investors should always check the latest issue documents.
SME IPO vs Mainboard IPO: Key Differences
| Feature | Mainboard IPO | SME IPO |
| Listing platform | Main Board | SME platform |
| Typical company profile | Larger established companies | Smaller and growing companies |
| Capital threshold | Higher listing requirements | Designed for smaller issuers |
| Minimum investment | Generally lower than SME requirements | Usually significantly higher |
| Investor participation | Broader retail participation | Higher minimum application requirements |
| Trading environment | Generally more liquid | Can have lower liquidity |
| Regulatory framework | Mainboard requirements | SME-specific requirements |
| Migration | Not applicable in the same way | Eligible companies can migrate to Main Board |
1. Company Size and Eligibility
One of the biggest differences is the size and eligibility framework.
For NSE’s SME platform, the post-issue paid-up capital must not exceed ₹25 crore under the current eligibility criteria. NSE also specifies requirements including at least three years of track record, positive net worth, operating profit of at least ₹1 crore from operations in any two of the previous three financial years and positive free cash flow to equity in at least two of those three years.
Mainboard companies are subject to a different eligibility framework. NSE’s current mainboard IPO criteria include minimum post-issue paid-up equity capital of ₹10 crore and minimum market capitalisation of ₹25 crore, together with other conditions.
Therefore, the two platforms should be evaluated under their respective rules rather than using one company’s eligibility standards to judge another.
2. Minimum Application Size
The minimum application amount is one of the most noticeable differences for investors.
Mainboard IPOs generally allow individual investors to apply at a substantially lower minimum amount, depending on the issue’s lot size and applicable rules.
SME IPOs, on the other hand, have significantly higher minimum application requirements. Recent SEBI changes have increased the minimum SME IPO application to two lots, with the minimum application size being above ₹2 lakh. NSE’s current IPO FAQ also states that SME individual investors applying for exactly two lots are classified as Individual Investors, while applications for more than two lots fall into the NII-Individual category.
This means SME IPO participation can require considerably more capital than a typical Mainboard IPO.
3. Investor Categories
Mainboard IPOs generally have established categories for different classes of investors, including individual investors, non-institutional investors and qualified institutional buyers, subject to the applicable issue rules.
SME IPOs also have category-based allocation, but the rules differ. Investors should therefore read the specific IPO’s offer document rather than assuming that the allocation structure will be identical to a Mainboard issue.
The removal of the earlier SME “retail” category and the introduction of the current Individual Investor framework are particularly important for investors evaluating SME issues.
4. Trading and Liquidity
Another important distinction is liquidity.
Mainboard companies generally have access to a larger pool of investors and a more established trading environment. This can contribute to greater trading activity, although liquidity varies from company to company.
SME shares can have a smaller investor base and lower trading volumes. Consequently, an investor may sometimes find it more difficult to buy or sell shares at the desired price.
A lower trading volume can also mean that relatively small orders may have a greater effect on the market price.
This does not mean every SME stock is illiquid or every Mainboard stock is highly liquid. Investors should examine the actual trading activity of the individual company.
5. Lot Size and Investment Requirement
SME IPOs commonly have larger lot sizes because of their minimum application requirements.
For example, if an SME IPO has a large lot size and a price of ₹100 per share, an investor may need to commit a substantially larger amount to submit the minimum application compared with a typical Mainboard IPO.
Investors should therefore check the price band, lot size and minimum application amount before deciding whether they can participate.
6. Company Information and Risk Assessment
Both Mainboard and SME IPOs require extensive disclosures, but investors should pay particular attention to the financial and operational risks of smaller businesses.
An SME may have:
- A smaller customer base
- Greater dependence on key promoters
- Concentration among suppliers or customers
- Limited operating history
- Higher working-capital requirements
- Greater sensitivity to changes in demand
- Smaller financial resources
These are not automatically weaknesses, but they are factors that can materially affect the company’s performance.
The RHP or prospectus should therefore be read carefully before investing.
7. Migration From SME Platform to Main Board
An SME company does not necessarily remain on the SME platform permanently.
Eligible companies can subsequently migrate to the Main Board if they satisfy the applicable requirements.
For example, NSE’s revised migration framework includes conditions relating to paid-up capital, market capitalisation, revenue, operating profit and minimum listing period. Under the cited NSE framework, a company seeking migration must have been listed on the SME platform for at least three years and meet specified financial and capitalisation criteria.
Migration is therefore a separate regulatory process and should not be assumed simply because a company grows after its SME listing.
8. Risk and Return Considerations
Neither SME IPOs nor Mainboard IPOs should automatically be considered safer or more profitable.
The investment outcome depends on the company’s business, valuation, financial performance, management, industry conditions, market sentiment and other factors.
SME companies may offer investors exposure to smaller businesses with growth potential, but they can also have greater concentration, liquidity and business risks. Mainboard companies may be larger and more established, but their shares can also experience substantial price fluctuations after listing.
The platform alone should therefore not be used as a substitute for analysing the individual company.
What Should Investors Check Before Applying?
Whether an IPO is an SME or Mainboard issue, investors should examine:
- Business model – Understand how the company makes money.
- Financial performance – Review revenue, profits, margins and cash flows.
- Debt – Check borrowings and interest obligations.
- IPO proceeds – Understand how the company plans to use the money.
- Promoters – Review their experience and shareholding.
- Customer concentration – Determine whether the company depends heavily on a few customers.
- Valuation – Compare the IPO valuation with appropriate listed peers.
- Risks – Read the risk-factor section of the RHP.
- Liquidity – Consider the potential difficulty of selling shares after listing.
- Minimum investment – Confirm the required application amount and lot size.
Conclusion
The primary difference between an SME IPO and a Mainboard IPO is the platform and regulatory framework under which the company raises capital and becomes listed. SME IPOs are designed for smaller companies and generally involve higher minimum application requirements, while Mainboard IPOs cater to companies meeting the mainboard’s listing criteria and generally offer broader participation.
For investors, the higher minimum investment in an SME IPO and the possibility of lower liquidity are particularly important considerations. At the same time, a Mainboard listing does not guarantee better investment performance.
Before applying to either type of IPO, investors should examine the company’s RHP, financial statements, valuation, promoters, risks, use of funds and applicable listing requirements. The decision should be based on the individual company’s fundamentals and the investor’s own financial circumstances rather than simply whether the IPO is classified as SME or Mainboard.