IPO Basics

Types of IPOs: Mainboard vs SME vs FPO Explained

Compare different types of public offerings in India - Mainboard IPOs, SME IPOs, FPOs, and OFS. Know which suits your investment style.

IPO Tips Team
23 December 2025
9 min read

Understanding Different Types of Public Offerings

The Indian capital market offers various types of public offerings to cater to different company sizes and investor needs. Understanding these differences is crucial for making informed investment decisions and matching your investment strategy with the right opportunities.

Mainboard IPOs

Mainboard IPOs are the most common type of public offerings, involving established companies listing on the main trading platforms of NSE and BSE.

Eligibility Criteria

  • Minimum 3-year track record of operations
  • Net tangible assets of at least ₹3 crores in preceding 3 years
  • Net worth of at least ₹1 crore in each of the preceding 3 years
  • Minimum issue size typically above ₹10 crores

Key Characteristics

  • Listed on main board of NSE/BSE
  • Higher liquidity post-listing
  • Stricter regulatory requirements
  • More comprehensive disclosures
  • Larger investor base

Who Should Invest?

Mainboard IPOs are suitable for most investors, from beginners to experienced traders. They offer relatively better liquidity and information availability for research.

SME IPOs (Small and Medium Enterprise IPOs)

SME IPOs involve smaller companies listing on dedicated SME platforms - NSE Emerge and BSE SME.

Eligibility Criteria

  • Post-issue paid-up capital not exceeding ₹25 crores
  • Minimum application size of ₹1 lakh (approximately)
  • Net worth of at least ₹1 crore as per latest audited accounts
  • Positive operating profit (EBITDA) in 2 out of 3 preceding years

Key Differences from Mainboard

ParameterMainboard IPOSME IPO
Minimum Lot Size~₹15,000~₹1,00,000
Market MakingOptionalMandatory for 3 years
Trading Lot1 shareMultiple shares
UnderwritingOptional100% mandatory
IPO Duration3-5 days3-5 days

Risks of SME IPOs

  • Lower Liquidity: Fewer buyers and sellers can make exiting difficult
  • Higher Volatility: Prices can swing dramatically
  • Limited Information: Less analyst coverage and research available
  • Higher Entry Barrier: Minimum investment around ₹1 lakh
  • Manipulation Risk: Smaller float makes manipulation easier

Who Should Invest?

SME IPOs are suitable for experienced investors who can afford higher risk, conduct thorough due diligence, and have sufficient capital for the higher minimum investment.

Follow-on Public Offer (FPO)

An FPO is when an already-listed company offers additional shares to the public. Unlike an IPO, the company is already trading on stock exchanges.

Types of FPO

Dilutive FPO

Company issues new shares, increasing total shares outstanding. This dilutes existing shareholders' ownership but brings fresh capital to the company.

Non-Dilutive FPO

Existing large shareholders (promoters, PE investors) sell their holdings. No new shares are created, so no dilution occurs.

FPO vs IPO

ParameterIPOFPO
Company StatusGoing public first timeAlready listed
Price ReferencePrice band set by merchant bankersMarket price available for reference
Risk LevelHigher (limited public data)Lower (track record visible)
Research AvailableLimitedAnalyst reports available

Why Companies Do FPOs

  • Raise additional capital for expansion
  • Reduce debt
  • Meet minimum public shareholding requirements
  • Provide exit to early investors

Offer for Sale (OFS)

OFS is a simpler mechanism for existing shareholders to sell their stakes without a full-fledged FPO. It's conducted through stock exchange bidding platforms.

Key Features

  • Completed in just one trading day
  • Only for companies with ₹1,000 crore+ market cap
  • 15% reserved for retail investors
  • Discount usually offered to retail investors (typically 5%)

OFS vs FPO

  • OFS is faster (1 day vs weeks)
  • OFS has no fresh issue component
  • OFS is less expensive to conduct
  • OFS requires less documentation

Rights Issue

While not strictly a public offering, rights issues are worth understanding. Existing shareholders get the "right" to buy additional shares at a discounted price before they're offered to others.

Key Features

  • Offered to existing shareholders in proportion to holdings
  • Usually at a discount to market price
  • Rights can be sold if shareholder doesn't want to subscribe
  • Used for raising capital without diluting existing shareholders' percentage ownership

Choosing the Right Offering Type

For Conservative Investors

Stick with mainboard IPOs and FPOs of established companies. Better liquidity and more information make these safer choices.

For Growth-Oriented Investors

Consider well-researched SME IPOs along with mainboard offerings. The higher risk can lead to higher rewards if you pick the right companies.

For Income-Seeking Investors

OFS offerings can provide entry points at discounted prices for dividend-paying stocks.

Conclusion

Each type of public offering serves different purposes and suits different investor profiles. While mainboard IPOs remain the most accessible and liquid option for retail investors, understanding the full spectrum of offerings helps you recognize opportunities that match your investment goals and risk tolerance. Always conduct thorough research regardless of the offering type, and remember that past performance doesn't guarantee future results.

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