Market capitalisation is not the price of a share — it is the total value of a company. A ₹5 stock is not cheaper than a ₹5,000 stock. What matters is the company's total size. Understanding market cap categories (Large Cap, Mid Cap, Small Cap) helps you select stocks that match your risk tolerance and investment horizon.
What Is Market Capitalisation?
Market Capitalisation (Market Cap) = Current Share Price × Total Number of Shares Outstanding
It represents the total market value of a company — what you would need to pay to buy every share of the company at the current price. It is the most widely used measure of a company's size in the stock market.
Example: Reliance Industries has approximately 675 crore shares outstanding. At a price of ₹2,900 per share: Market Cap = ₹2,900 × 675 crore = ₹19.57 lakh crore. This makes it one of India's largest companies by market cap.
Large Cap, Mid Cap, Small Cap — SEBI Definitions for India
SEBI has officially defined the market cap categories for Indian stocks based on their ranking by market cap:
| Category | SEBI Definition | Examples | Characteristics |
|---|---|---|---|
| Large Cap | 1st to 100th company by full market cap | Reliance, TCS, HDFC Bank, Infosys, ICICI Bank | Most stable, lower risk, lower return potential, highest liquidity |
| Mid Cap | 101st to 250th company by full market cap | Muthoot Finance, Coforge, Persistent Systems, Trent | Moderate risk, moderate return, good liquidity |
| Small Cap | 251st company onwards | Smaller sector companies, emerging businesses | Highest risk, highest potential return, lower liquidity |
Why Market Cap Matters for Indian Investors
- Risk and return profile: Small caps can deliver 5–10× returns in bull markets but fall 60–80% in bear markets. Large caps are more stable but rarely deliver 5× returns. Match your category to your risk tolerance.
- Liquidity: Large cap stocks can be bought and sold easily in large quantities without moving the price. Small cap stocks have low daily volume — large orders can move the price significantly, and it may be hard to exit during a market crash.
- Mutual fund categories: SEBI mandates that large cap funds hold at least 80% in large cap stocks, mid cap funds in mid caps, etc. Understanding these categories helps you choose the right mutual fund.
- Nifty 50 = India's largest 50 large cap stocks. The Nifty Midcap 150 and Nifty Smallcap 250 cover the corresponding mid and small cap segments.
Free-Float Market Cap — What Nifty Uses
Nifty 50 is weighted by free-float market cap, not total market cap. Free-float market cap excludes shares held by promoters, government, and other restricted holders — it only counts shares available for public trading. This means a company with 60% promoter holding contributes less to Nifty than a company of the same total market cap with 30% promoter holding.
Open NSE's website → Market Data → Market Capitalisation. Look at India's top 10 companies by market cap. Note the difference between the market caps at rank 1 and rank 100 (the boundary between large and mid cap). This gives you a feel for how concentrated India's large cap space is. Read next: What Is P/E Ratio? How to Use It for Indian Stocks.