An Initial Public Offering (IPO) is the process by which a privately-held company sells its shares to the public for the first time, becoming a publicly-listed company on a stock exchange like BSE or NSE. For the company, it is a way to raise capital from public investors and provide an exit to early backers. For retail investors, it is an opportunity to buy into a business at its first public-market debut — potentially capturing listing-day gains and longer-term wealth creation.
What is an IPO — In Plain Language
Before an IPO, a company's shares are owned by a small group — promoters, employees, venture capitalists, private equity investors, and family. These shares cannot be freely traded. Through an IPO, the company issues new shares (or sells existing shares held by early investors) to the public, and these shares begin trading on a stock exchange.
Once listed, the company is subject to ongoing regulatory disclosures, quarterly results, corporate governance norms set by SEBI (Securities and Exchange Board of India), and continuous price discovery through public trading.
Why Do Companies Go for an IPO?
Companies pursue an IPO for several strategic reasons:
- Raise growth capital — Fund expansion, new factories, R&D, or working capital from public investors instead of taking on more debt.
- Repay existing debt — Use IPO proceeds to deleverage the balance sheet and reduce interest costs.
- Provide an exit to early investors — Allow venture capital, private equity, and pre-IPO shareholders to monetise their holdings via the offer-for-sale (OFS) component.
- Gain a public-market valuation — Establish a transparent market price for shares, useful for future fundraising, M&A currency, and stock-based employee compensation.
- Brand and credibility — Listed companies typically gain visibility, customer trust, and easier access to credit.
Mainboard IPO vs SME IPO
Indian IPOs come in two flavours, depending on the company's size and listing platform:
| Feature | Mainboard IPO | SME IPO |
|---|---|---|
| Listing platform | BSE / NSE main exchange | BSE SME / NSE Emerge |
| Pre & post-issue paid-up capital | Minimum Rs 10 crore | Rs 1 crore to Rs 25 crore (must migrate to Mainboard if exceeded) |
| Minimum issue size | Rs 10 crore | Smaller — typically Rs 1-50 crore |
| Profitability requirement | Net tangible assets ≥ Rs 3 crore in each of last 3 years; average operating profit ≥ Rs 15 crore in 3 of last 5 years | Minimum EBITDA of Rs 1 crore in 2 of last 3 financial years |
| Track record needed | Under SEBI ICDR norms | Minimum 3-year functional track record |
| Retail lot size (typical) | Around Rs 14,000-15,000 | Around Rs 1-1.5 lakh (much higher) |
| OFS (Offer for Sale) cap | Generally up to 50% of issue (case-by-case) | Capped at 20% of total issue size |
| Liquidity post-listing | High — daily trading volumes | Lower — fewer market participants |
| Suitable for | All investor types including retail beginners | Informed investors comfortable with higher volatility and lower liquidity |
Most retail investors should start with Mainboard IPOs. SME IPOs can deliver higher listing gains in bull markets but also list at discounts during corrections. Read our full recommendation methodology to understand how we evaluate both types.
Book-Built vs Fixed-Price IPOs
IPOs use one of two pricing mechanisms:
- Book-built issue (most common) — The company sets a price band (e.g., Rs 162-171). Investors bid within the band, and the final issue price is determined based on demand. Retail investors can choose the "cut-off price" option, which auto-bids at the upper end of the band.
- Fixed-price issue (rare for Mainboard, common for some SME) — The company sets a single fixed price upfront. There is no bidding within a range. The cut-off option is not available.
The Indian IPO Process — Step by Step
Here's the full journey from a company deciding to go public to its shares trading freely:
- Internal preparation — Company hires merchant bankers (BRLMs), legal advisors, and auditors. Restated 3-year financial statements are prepared.
- DRHP filing — The Draft Red Herring Prospectus is filed with SEBI for review. Read our guide on how to read a DRHP »
- SEBI review — SEBI typically issues observations within 30 days. Company addresses them, may file an Updated DRHP (UDRHP) if needed.
- RHP filing — Red Herring Prospectus is filed with SEBI and the Registrar of Companies (RoC). Price band, issue size, and dates are now finalised.
- Anchor allocation — One working day before the public issue opens, anchor investors (mutual funds, FPIs, insurance companies) are allotted up to 60% of the QIB portion. Read our anchor investor guide »
- Public issue opens — Retail, NII, and remaining QIB investors apply for 3 working days (mainboard) or up to 5 days (SME).
- Allotment — The registrar finalises the basis of allotment by T+1. Shares are credited to demat accounts of successful applicants. Read our allotment guide »
- Listing on exchange — Shares begin trading on BSE / NSE on T+3 working days from issue close, under SEBI's mandatory T+3 listing timeline (in force since December 2023).
From DRHP filing to actual listing typically takes 3-6 months.
IPO Investor Categories — Who Can Apply?
SEBI divides IPO applicants into four categories, each with reserved allocations and rules:
| Category | Who | Application Size | Reservation in Book-Built IPO |
|---|---|---|---|
| Retail (RII) | Individual investors | Up to Rs 2 lakh | Minimum 35% |
| NII / HNI | Non-institutional investors | Above Rs 2 lakh; split into Small NII (Rs 2-10 lakh) and Big NII (above Rs 10 lakh) | Minimum 15% (1/3 to sNII, 2/3 to bNII) |
| QIB | Mutual funds, FPIs, banks, insurance, pension funds | Institutional-only | Maximum 50% |
| Anchor (subset of QIB) | Top-tier QIBs allocated 1 day before public issue opens | Minimum Rs 5 crore per anchor (per SEBI ICDR Third Amendment 2025) | Up to 60% of QIB portion |
How Retail Investors Can Apply for an IPO
Retail investors in India apply for IPOs through one of two payment methods:
- UPI through your broker app (Zerodha, Groww, Upstox, Angel One, etc.) — Fastest, most popular method. UPI mandate-based application up to Rs 5 lakh.
- ASBA via net banking — Submit through your bank's IPO section. Used by HNIs and Big NII applicants above Rs 5 lakh, and by retail investors who prefer net banking.
See our detailed guides on how to apply for an IPO and the ASBA vs UPI comparison to choose the right method.
What Should You Check Before Applying for an IPO?
Smart IPO investing means looking at multiple signals, not just the buzz around an issue:
- Grey Market Premium (GMP) — Unofficial pre-listing premium that signals demand intensity. What is GMP?
- Subscription status — How many times the issue is oversubscribed, especially in the QIB category. Strong QIB participation is the most reliable signal of issue quality.
- Valuation — Compare the company's post-issue P/E ratio with listed industry peers.
- Fundamentals — Look at revenue growth, profit margins, ROE, and debt levels in the most recent 3 years.
- Anchor investor quality — Top mutual funds and FPIs participating signals strong institutional confidence.
- DRHP red flags — Customer concentration, pending litigation, OFS-heavy structure, and aggressive valuation. How to read a DRHP »
Risks of IPO Investing
IPO investing is not risk-free. Common risks every retail investor should understand:
- Listing-day losses — IPOs can list flat or in discount when market conditions turn negative or when the issue is overpriced.
- Allotment uncertainty — In oversubscribed retail issues, allotment is by SEBI lottery; you may not receive any shares.
- Locked-in capital — Money is blocked for 4-7 days from application to allotment / refund, even if you don't get shares.
- Limited information — Unlike listed stocks, IPO companies have shorter public-market track records to evaluate.
- Post-listing volatility — Even successful IPOs can see significant price swings in the weeks after listing as anchor lock-ins expire.
Always read the Red Herring Prospectus (RHP) for risk factors specific to the company before investing.
Common IPO Terms You Should Know
If you're new to IPOs, these terms come up frequently:
- DRHP / RHP — Draft / Red Herring Prospectus
- GMP — Grey Market Premium
- ASBA / UPI — Application payment methods
- Cut-off price — Auto-bid at upper price band (retail mainboard option)
- Lot size — Minimum shares per application
- QIB / NII / RII — Investor categories (institutional / non-institutional / retail individual)
- Anchor investor — QIBs allocated 1 day before public issue
- OFS — Offer for Sale (existing shareholders selling stake alongside fresh issue)
- Listing gain — Difference between issue price and listing-day opening price
For full definitions, see our IPO Glossary (A-Z).
Key Takeaways
- An IPO is when a private company sells shares to the public for the first time and lists on a stock exchange (BSE / NSE for Mainboard, BSE SME / NSE Emerge for SME).
- Companies use IPOs to raise capital, repay debt, provide exits to early investors, and gain a public-market valuation.
- The Indian IPO process from DRHP filing to listing typically takes 3-6 months. Listing happens on T+3 working days from issue close.
- Retail investors get a minimum 35% reservation in book-built Mainboard IPOs and can apply via UPI (up to Rs 5 lakh) or ASBA.
- Smart IPO investing combines GMP, subscription data, valuation, fundamentals, and DRHP red-flag analysis — not just hype.
Last updated: May 2026. SEBI rules around IPO eligibility, allocation, and listing timelines are amended periodically; verify current rules on the official SEBI website before relying on specific thresholds.