Large-Cap, Mid-Cap and Small-Cap: How Indian Stocks Are Grouped by Market Capitalisation
Fund factsheets, index names and market news in India constantly refer to "large-cap", "mid-cap" and "small-cap" stocks. These labels are not loose descriptions. For mutual funds, they follow a definition set by SEBI and a list published by AMFI.
Information only, not investment advice.
What market capitalisation means
Market capitalisation is the total market value of a company's shares:
Market cap = share price × number of shares outstanding
A company with 50 crore shares trading at ₹400 has a market cap of ₹20,000 crore. The figure changes every trading day as the price moves.
Market cap says nothing on its own about profit, debt or quality. It is a measure of size as the market currently values it.
The SEBI definition
In its October 2017 circular on categorising mutual fund schemes, SEBI defined the three groups by rank, not by a fixed rupee amount:
| Category | Rank by full market capitalisation |
|---|---|
| Large-cap | 1st to 100th company |
| Mid-cap | 101st to 250th company |
| Small-cap | 251st company onwards |
Because the definition uses rank, the rupee cut-offs move with the market. A company can shift categories without changing at all, simply because other companies grew faster or slower.
The AMFI list
To keep every fund house on the same page, AMFI (the Association of Mutual Funds in India) publishes the ranked list of stocks twice a year, based on average market capitalisation over the previous six months. Funds use it to check that a "large-cap fund" really holds mostly large-cap stocks, as their scheme rules require.
How this connects to indices
Index providers have their own methodologies, but the broad families line up with the same idea:
- Nifty 50 and Sensex: a small set of the largest, most traded companies
- Nifty Midcap 150: the next tier
- Nifty Smallcap 250: the tier after that
Index membership depends on the provider's rules (such as free-float market cap and liquidity), so it does not match the AMFI list exactly.
Why the categories matter to readers
- Comparison. A small-cap fund and a large-cap fund are not like-for-like; their returns and price swings differ in character.
- Volatility. Smaller companies have historically shown larger price swings, in both directions.
- Liquidity. Shares of smaller companies may trade in lower volumes, so prices can move more on large orders.
None of this makes one category better than another. The labels describe what a stock or fund is, not whether it suits any particular person.
Free float versus full market cap
Full market cap counts all shares. Free-float market cap counts only shares available for public trading, leaving out promoter and certain locked-in holdings. SEBI's mutual fund categories use full market cap; many indices use free float.
Live prices and market-cap figures for NSE and BSE stocks can be tracked on Pricify.