What is market cap?
Market capitalisation, or market cap, is the value the stock market puts on a whole company. It is the share price multiplied by the number of shares in issue. A company with 100 crore shares trading at ₹500 has a market cap of ₹50,000 crore.
It is a measure of size, not of quality or price. A high market cap does not mean a stock is expensive, and a low one does not mean it is cheap. For that you look at ratios such as P/E, and at fundamentals summarised in the quality score.
Market Cap = Share Price × Total Shares Outstanding
Some indices use free-float market cap, which counts only the shares available to the public. The classification below uses full market cap.
How India classifies large, mid and small cap
SEBI sets the rule by rank, not by a fixed rupee figure. Companies are ordered by full market cap on a list that AMFI publishes twice a year: ranks 1 to 100 are large cap, ranks 101 to 250 are mid cap, and rank 251 onward are small cap. Mutual fund categories such as Large Cap, Mid Cap and Small Cap funds use exactly these buckets.
Because the line is a rank, the rupee boundary moves with the market. When prices rise, the market cap needed to make the top 100 rises with them.
The real split of Indian listed stocks
CHART
Number of listed stocks by market cap category (2,523 classified stocks)
Count of active stocks in each category in the Punji stock database.
| Category | Stocks | Smallest market cap | Largest market cap |
|---|---|---|---|
| Large Cap | 100 | ₹87,644 Cr | ₹16,10,364 Cr |
| Mid Cap | 148 | ₹3,835 Cr | ₹1,30,034 Cr |
| Small Cap | 2,275 | ₹5 Cr | n/a |
The pattern is steep: 100 large caps and 148 mid caps against 2,275 small caps. The smallest large cap is worth about ₹87,644 crore, while the largest mid cap is about ₹1,30,034 crore. Those ranges overlap because market caps change daily while the category list is refreshed only twice a year, so a company can have grown past the old line without being reclassified yet.
Why it matters for investors
Size tends to go with a trade-off. Large caps are usually more liquid, so shares are easy to buy and sell at fair prices. Small caps can grow faster from a low base but are thinner to trade (see average daily traded value) and usually swing more. That is why funds are grouped by cap size and compared only within the same group.
Frequently asked questions
What is the difference between market cap and free-float market cap?
Full market cap multiplies the price by all shares. Free-float market cap counts only the shares available to the public, excluding promoter and other locked-in holdings. Many index providers use free-float.
Can a stock move between large, mid and small cap?
Yes. Because the classification is by rank and refreshed twice a year, a stock moves category when its rank crosses 100 or 250 on the updated list.
Is a bigger market cap safer?
Larger companies tend to be more liquid and more established, but size does not remove risk. Large companies can fall sharply and small ones can grow, so size is a starting point, not a verdict.
WHAT THIS MEANS FOR YOU Do not treat large cap as safe and small cap as risky as a rule. Size describes the company, not the price you pay. Compare a stock with others in the same category, and read market cap alongside valuation and quality, not instead of them.
METHODOLOGY Category counts and market cap ranges as of 2026-10-25, from the Punji stock database (D1 stocks). Large, mid and small cap follow SEBI’s rank-based classification as published by AMFI; stocks without a category, and unlisted entries, are excluded from the counts. Not investment advice.