India raised over ₹1.19 lakh crore through public offerings last year. But many retail investors are blindly throwing away their money, not knowing the fundamental mechanics. Treating all market debuts as the same event is a fast track to misallocation of money and misunderstanding of risk. The first step to go from being a passive saver to an active player in the equity markets is to understand the structural differences between Fixed Price, Book Building and SME issues.
What is an IPO? How Does the IPO Process Work?
IPO (Initial Public Offering) is the process when a private company sells its shares to the public for the first time. This cycle encompasses the appointment of investment banks, the filing of a prospectus with regulators, the price setting, the opening for public bidding and the listing on a stock exchange.
An Initial Public Offering (IPO) is the first time a privately held company goes public. The rigorous process is primarily undertaken by companies to raise new equity funding for expansion, pay down debt or allow early private investors to exit. But usually, an IPO is a carefully rehearsed and regulated play. The journey starts when a company hires investment banks, known as Book Running Lead Managers (BRLMs), to evaluate its financial health and underwrite the offering. They prepare a detailed document together, outlining the company’s financial position, risks and business model. This is then submitted to the market regulator and is called the Draft Red-Herring Prospectus (DRHP).
Once the DRHP gets reviewed and approved by the Securities and Exchange Board of India (SEBI), the company will decide the issue dates and pricing strategy. The IPO is then available for public bidding, usually for three to five days. When the bidding period ends, shares are distributed based on demand and regulatory formulas. The stocks are then credited to the demat account of the investor and the stock starts trading on the public exchanges like the NSE and BSE.
The Two Primary Types of IPOs: Fixed Price Vs Book Building
When a company goes public it has to decide what price to charge investors for its stock. The entire process of retail investor bidding is defined by the method of choice. Earlier companies were relying on Fixed Price issues but in the current markets the option is Book Building process.
In a Fixed Price Issue, the company and its underwriters estimate the company’s assets and liabilities and forecasts of future revenue to set a single non-negotiable share price. Then the price is printed in the final prospectus before the issue even opens to the public. That means investors know precisely what price they will pay per share and have to apply at that exact price point. If the share price is ₹150, then every bid has to be ₹150.
Whereas in the case of Book Building Issue, there is no fixed price initially. The company instead offers a “price band,” which is a range of prices with a floor price (minimum price) and a cap price (maximum price). Investors submitted bids saying how many shares they want and the price range they are willing to pay for them. As offers arrive, the underwriter “builds a book” of demand. It is important to know the basic definitions of Fixed Price vs Book Building issues to set realistic expectations for allocation, according to leading financial resources.
Why do firms like Book Building better than Fixed Prices?
Companies overwhelmingly prefer the Book Building method as it helps in accurate price discovery. In a Fixed Price issue the company is exposed to the risk of under-pricing the shares (leaving money on the table) or over-pricing the shares (resulting in an undersubscribed, failed IPO). And that is where book building comes into play, using the open market to establish the final value based on real time demand. The final issue price is at the upper cap amid the huge demand from institutions and retails. In a weak market sentiment, the company can price the shares closer to the floor so that the issue is still able to close successfully without alienating investors.
Main Differences: Offer on Book Building and Fixed Price Offer
Retail investors need to understand the structural differences between the two methodologies so they can optimize their bidding strategy. The main difference is in the way of determining the price and transparency of the demand in the bidding window.
Comparison Table
| Feature | Fixed Price Issue | Book Building Issue |
|---|---|---|
| Price Determination | Set in stone before the issue opens. | Discovered through a price band during bidding. |
| Demand Visibility | Total demand is only known after the issue closes. | Daily demand is visible as the “book” is built. |
| Payment Mechanism | Investors pay 100% of the fixed price upfront. | Investors block funds based on their specific bid price. |
| Final Price Location | Printed in the initial offer document. | Finalized post-bidding in the final prospectus. |
In a Fixed Price situation you are, basically, buying a product off of a shelf with a pre-printed bar code. The Book Building process is a blind auction, where the last clearing price is determined only when all the bids are in.
SME v/s Mainboard IPOs: Which One is Right for You?
The actual exchange platform on which a company lists, as well as the pricing mechanism, has a dramatic effect on the risk profile and capital requirements of the investment. For the modern retail investor, the choice remains the traditional Mainboard IPO or the ever popular SME IPO.
Mainboard IPOs are large public offerings by mature and highly regulated companies. These are the heavy hitters you see and hear in the business news channels. They are listed at major stock exchanges like BSE and NSE. They need to have a minimum paid up capital of Rs 10 crores (generally way above this) in post issue. Retail investors can get in with a very accessible minimum investment of around Rs 14,000 to Rs 15000 a lot. Liquidity is high, so once listed, shares can be bought and sold instantly.
SME IPOs are limited to early stage, high growth companies. These companies are listed on exclusive platforms like BSE SME or NSE Emerge. These smaller, riskier companies are protected from casual investors by a big financial barrier to entry from regulators. The minimum application size for a SME IPO is usually more than Rs 1 lakh, often Rs 1.2 lakh to Rs 1.4 lakh. SME shares are also traded in ‘lots’ rather than individually and this can be a major restriction to liquidity post listing.
It just depends how much capital you have and how much risk you want to take. Mainboard gives you stability and liquidity, SME gives you venture-capital-style growth potential. Learn more about how SME IPOs work and alternative equity to determine whether your portfolio is ready for high-growth instruments.
What is SME IPO and Mainboard?
- Mainboard IPO: It is the listing of a large or established company on the main stock exchanges such as NSE/BSE. The shares are highly liquid and the minimum retail investment is very low, around Rs 15,000.
- SME IPO: An offer by a small or medium-sized enterprise that lists on specialized exchange platforms (NSE Emerge/BSE SME). These are higher-risk, higher-reward plays with a minimum investment block of over ₹1 lakh that are traded in fixed lot sizes, and are structurally less liquid than mainboard stocks.
What is Offer for Sale (OFS) and Follow on Public Offers (FPO)?
Nor is it always a matter of public concern when a firm seeks to raise more money to build yet another plant or expand its operations. More often than not the proceeds find their way into the pockets of existing stakeholders. This is where the difference between fresh issues and OFS and FPO becomes important.
An Offer for Sale (OFS) is the offer of their existing shares to the public by the promoters, early venture capital firms or government (in case of PSUs). In pure OFS the company gets not a single rupee from the IPO. No change in total shares out. It’s just a matter of changing ownership from private to public. An OFS typically has an exit opportunity for early investors but in the case of 100% OFS, investors should ask why the founders are cashing out.
A Follow-on Public Offer (FPO) is when a company already listed on the stock exchange makes a fresh issue of its shares to the public to raise further capital. An FPO is not a company’s first public offering, but is used by established players in the market to service debt or fund big acquisitions without taking expensive loans. Read our in-depth analysis of the mechanics of IPO vs FPO here.
What are the 4 types of shares
Capital structures may be more complex, but public offerings are usually standard equity shares for retail investors. The four main types of share are:
- Equity Ordinary Shares: Common stock sold in an initial public offering. It has voting rights and fluctuating dividends.
- Preference shares: Shares which do not have voting rights but do guarantee a fixed dividend which is paid before the ordinary shareholders.
- Differential Voting Rights (DVR) Shares: These are shares of stock that have lower voting rights but higher dividend payments.
- Cumulative Preferred Stock: A type of preferred stock that must pay dividends to its holders before any dividends can be paid to common shareholders.
IPO Investors Types – Which One Are You?
IPO allocations are not first come first serve. Regulators have strict rules that bucket the available shares in certain ways to make sure they are distributed fairly to different classes of market participants. Your position on that spectrum determines your bid limits and chances of winning.
- Qualified Institutional Buyers (QIB): Large financial institutions like mutual funds, foreign portfolio investors and commercial banks. In a Book Building issue, QIBs are generally allotted up to 50% of the total offer.
- Non-Institutional Investors (NII) / HNI: Individuals/corporates for application of more than Rs 2 lakh. They generally get a 15% quota and cannot bid at the “cut-off price”.
- Retail Individual Investors (RII): If your total bid is less than Rs 2 lakh, you are in this bucket. In a Book Building issue, the regulators stipulate that at least 35% of the issue must be reserved for retail investors.
Read more about how to improve your odds of getting an allotment in our Investor Types guide.
Key IPO Terms to Know: GMP, Price at Cut-Off & Greenshoe Option
If you want to go out there and play in the public markets you have to learn a certain financial language. If you don’t understand these terms, you could bid wrong or set the wrong expectation for your listing.
- The Grey Market Premium (GMP): An unofficial and unregulated gauge to estimate the premium at which IPO shares are traded in the private market before being listed. So if the price of the share is ₹100 and the GMP is ₹30, the market expects the share to list at ₹130. GMP is very volatile and should never be the sole reason to invest.
- The Cut-Off Price: A special tool for Retail Individual Investors. If you are bidding in a price band (say ₹90 to ₹100), then by selecting the “cut-off” option you are agreeing to pay the final price decided. This ensures your application will not get rejected.
- The Greenshoe Option: A price stabilizer. The underwriter can legally sell up to 15% more shares than intended. If the stock price drops right after listing, the underwriter will buy those extra shares in the open market, decreasing the supply and stabilizing the price.
How to Apply for an IPO: The ASBA Process?
No more writing paper checks and waiting weeks for refunds. Today, all retail applications are processed through ASBA (Application Supported by Blocked Amount). ASBA is a major regulatory innovation protecting the investor. In ASBA the money is not transferred to the company immediately, the application amount is just ‘blocked’ in your bank account. You keep earning interest on that money until the allotment is final. The precise amount will be deducted if you are granted shares. And if you don’t get an allotment, the block is removed instantly.
- Log onto your Broker or Net Banking Application: Access the IPO section of your demat account or your bank’s ASBA portal.
- Choose Active Issue and Fill UPI ID: Select the company, enter the number of lots you want to bid for and fill your validated UPI ID.
- Select Cut-Off Price: Always tick the “Cut-Off Price” box, so that your bid is valid irrespective of what the final price discovery is.
- Approve the UPI Mandate: Open your UPI app and approve the mandate. Your money will be instantly blocked on your account.
To learn more about how to avoid common mandate failures, check out our comprehensive guide to the ASBA process.
The Future of IPOs: Expanding Retail Access
The public offering space is fast evolving in favour of the retail investor. Regulators keep pushing up timelines, forcing open access to high-yield instruments formerly behind institutional walls. The market has recently embraced a mandatory T+3 listing timeline. Previously, a company had to wait until T+6 after the close of the issue to get listed on the exchange, locking up retail capital.
Now, just three days after closing, the shares are credited and trading opens. “It’s about the regulatory definitions and the recent changes like the T+3 listing timelines and how the infrastructure is being optimized for retail efficiency. The walls between the average saver and the creation of institutional-grade wealth are falling as digital infrastructure improves. Whether you are bidding for a traditional Mainboard issue, looking at the high growth potential of a SME IPO or considering earlier stage unlisted equity, the modern market requires active participation over passive saving.
Conclusion
IPOs are not lottery tickets — they are structured financial events governed by SEBI rules, price discovery, and investor categories. Understanding whether an issue is Fixed Price or Book Building, Mainboard or SME, Fresh Issue or OFS, directly impacts your allocation chances and risk exposure.
For most retail investors, the key is to focus on the fundamentals behind the IPO, not just the hype or GMP. Use tools like ASBA, cut-off bidding, and the T+3 listing timeline to make the process efficient. And always match the IPO type to your capital and risk appetite: Mainboard for stability and liquidity, SME for high-growth potential with higher risk.
The future of public markets is about democratizing access. With faster listings, digital applications, and clearer regulations, the gap between institutional and retail participation is narrowing. The smartest approach is to move from passive saving to active, informed participation in public offerings.
Disclaimer
This article is for educational purposes only and is not investment or trading advice. Investing in IPOs involves market risk including loss of principal. Please consult a SEBI-registered advisor before making investment decisions.
