Main Board IPO vs SME IPO
A Main Board IPO is a public issue by companies meeting SEBI ICDR mainboard eligibility thresholds (minimum post-issue paid-up capital of Rs 10 crore and listing on NSE or BSE main board), while an SME IPO is a public issue by smaller companies listed on BSE SME or NSE Emerge platforms with a post-issue paid-up capital ceiling of Rs 25 crore, subject to lighter disclosure and financial track record requirements.
India's equity capital markets feature two distinct IPO frameworks tailored to companies of different sizes: the Mainboard IPO framework, governed by SEBI's ICDR Regulations, and the SME IPO framework, governed by Chapter IX of SEBI's ICDR Regulations and the specific rules of BSE SME and NSE Emerge, which are SEBI-recognised stock exchanges dedicated to small and medium enterprises.
The eligibility threshold is the primary differentiator. For a Mainboard IPO, the post-issue paid-up share capital must be at least Rs 10 crore. In practice, most mainboard IPOs involved significantly larger companies. For an SME IPO, the post-issue paid-up capital must not exceed Rs 25 crore (companies above Rs 25 crore of paid-up capital must migrate to the main board). The minimum application and trading lot size for SME IPOs is Rs 1 lakh, compared to Rs 15,000–Rs 20,000 for mainboard IPOs — this higher minimum lot size reflects the fact that SME stocks are intended for more informed investors, given the lesser degree of regulatory scrutiny.
The track record requirements are more stringent for mainboard IPOs. SEBI's ICDR Regulations require that mainboard IPO issuers (under the standard track record route) have at least three years of audited financial statements showing operating profits for at least three of the five preceding years, or meet alternative eligibility conditions (such as being a government-owned entity, or having a project that has received a specified quantum of financing from scheduled banks or financial institutions). SME IPO requirements are lighter: a minimum of three years of business operations and a positive net worth at the time of the IPO filing are the basic thresholds, making the route accessible to younger businesses.
The disclosure and regulatory requirements also differ. Mainboard IPOs require a DRHP reviewed by SEBI before the RHP is filed. For SME IPOs, the filing is made directly with the SME exchange (BSE SME or NSE Emerge) rather than SEBI — the exchange performs the due diligence review. This means SEBI does not individually review each SME DRHP, though SEBI's overall regulatory oversight of the exchanges ensures that the exchange's review processes are maintained to a standard. Mandatory market making — the appointment of a designated broker to provide buy and sell quotes — was a feature of SME IPOs to address the liquidity challenges of smaller-company stocks.
The SME IPO segment saw significant activity in 2022–2024, with hundreds of SME IPOs listed annually. However, concerns arose about the quality of some SME issuers, instances of price manipulation in illiquid SME stocks, and the adequacy of disclosure standards. SEBI increased its scrutiny of the segment during this period, issuing circulars to tighten SME IPO standards and improve investor protection.