How to screen stocks by market cap in India in 2026
Quick Answer: Market capitalisation is share price multiplied by the number of shares outstanding. Screening by it sorts companies by size rather than by price. Free float market cap counts only the shares actually available to trade, which is what NSE has used to compute the Nifty 50 since 26 June 2009.
Size is the first filter most screens apply, and it is the one most often misunderstood. Share price alone settles nothing, and market cap is the number that does.
What does market capitalisation mean?
Market capitalisation values a whole company at once, by taking the traded share price and multiplying it across every share in issue.
What the market says a whole company is worth, right now, is the question it answers. Share price alone tells you nothing about size: split one share into ten and the company is no different. Price and share count together is the combination that works, which is why every size screen reaches for market cap and none reaches for price.
What is the market capitalisation formula?
Market capitalisation = current share price × total number of shares outstanding. This is why a ₹300 share is not a smaller company than a ₹3,000 one.
Trivial arithmetic on two published inputs: that is why market cap is the most widely available size measure there is. Neither input holds still. Price ticks all session, and an issue or a buyback moves the share count.
What is free float market capitalisation?
Free float market cap counts only the shares actually available for public trading. NSE Indices has computed the Nifty 50 on that basis since 26 June 2009.
Promoter holdings, government stakes and strategic blocks do not trade in the ordinary course. Count them and you overstate how much of a company the market can actually price. Excluding them is what makes an index weight reflect what is genuinely available to buy.
The distinction matters more than it sounds. Consider a company with 75% held by promoters: its free float is a quarter of its full market cap, and so its influence on an index is a quarter of what the headline size would lead you to expect. Headline size, in other words, can be a poor guide to index weight.
How do you screen stocks by size in India in 2026?
By setting a market-cap range as the first filter, then layering other conditions inside it. NSE's own benchmark covers 53.73% of NSE free-float market capitalisation as on 30 March 2026, and the rest of the market sits below it.
Size goes first because most other ratios behave differently at different sizes, and comparing across the whole market at once quietly mixes populations that were never alike. NSE's own index structure shows the separation clearly enough, each index built from a different size band.
| Index | Close, 7 September 2026 | What it covers |
|---|---|---|
| Nifty 50 | 23,779.15 | the 50 largest, 53.73% of NSE free-float market cap as on 30 March 2026 |
| Nifty Next 50 | 72,575.75 | the 50 ranked immediately below |
| Nifty Midcap Select | 14,650.70 | a selected midcap set |
Closes: NSE, as of 7 September 2026. Free-float share: NSE Indices, as on 30 March 2026.
The levels themselves are not size comparisons. Each index level reflects its own base value and its own history, which is why the Nifty Next 50 standing well above the Nifty 50 says nothing about the companies inside either being larger. Current levels are published on NSE's index tracker. Constituent detail for the benchmark sits on Multibagg's Nifty 50 index page.
Multibagg's screener carries market cap as a filter field across NSE and BSE listed companies, which is what lets a size range be set before any other condition is applied. Individual company figures sit on the stocks hub.
What are large cap, mid cap and small cap?
Size bands used to group companies, most formally in the classification of mutual fund schemes.
Rank every listed company by market capitalisation, then cut the list into bands: large cap at the top, mid cap beneath it, small cap below that. Those cut-offs get refreshed periodically as company sizes shift, so a business can move between bands without having done anything differently at all.
For screening, the practical point is that the bands are just ranges on the same continuous measure. A screen can use them, or it can set its own market-cap range and ignore the labels entirely.
What is the market cap to GDP ratio for India?
Total market capitalisation of listed companies divided by the size of the economy, expressed as a percentage.
As a rough gauge of how large the listed market has grown relative to national output, it has its uses. The two inputs come from entirely separate places: exchange data on top, national accounts underneath. They are published on different schedules and revised at different times. That is why the ratio is quoted with a range of values depending on which vintage of each input is used, and why arguments about India's headline growth figures change the denominator underneath it.
Why does market cap differ from what a company is worth?
Because market cap prices the equity only, at today's price, on the shares that exist. The Nifty 50 closed at 23,779.15 on 7 September 2026, a price for its constituents' equity and nothing else.
Debt is excluded, though a buyer of the whole business would have to assume it. So is cash sitting on the balance sheet. The last traded price is also treated as achievable across the entire holding, an assumption that breaks down wherever volumes are thin.
The gap shows clearest before a listing, when no traded price exists yet. That is why pre-listing valuation ranges get argued over rather than observed, and why private-company valuations show how far the number depends on method rather than observation.
Common Mistakes
Four errors account for most misused size screens.
- Treating a low share price as a small company. Price without share count says nothing about size.
- Using full market cap where free float applies. The Nifty 50 has been free-float weighted since 26 June 2009, so index influence follows tradable shares, not total shares.
- Comparing ratios across size bands. Populations differ, which is why size is set as the first filter rather than the last.
- Assuming the bands are fixed. Size classifications are periodically refreshed, so a company can change band without changing anything about itself.
Frequently Asked Questions
Does a stock split or bonus issue change a company's market capitalisation?
No. A split or bonus issue multiplies the share count and divides the share price by the same factor, so the product is unchanged. A ₹3,000 share that splits ten-for-one becomes ten ₹300 shares, and the company is worth exactly what it was the day before. Any move in market cap after the event comes from trading, not from the split itself.
Can two companies with the same share price have very different market caps?
Yes, and they usually do. Share price says nothing about size on its own, because it depends on how many shares the company happens to have issued. Two companies both trading at ₹500 could differ in market cap a hundredfold if one has ten crore shares in issue and the other a thousand crore. Only price multiplied by share count is comparable.
What is the difference between market capitalisation and enterprise value?
Market cap prices the equity alone. Enterprise value adds net debt to it, taking market cap, adding borrowings and subtracting cash, to approximate what a buyer of the whole business would actually take on. Two companies with identical market caps can have very different enterprise values if one carries heavy debt and the other holds net cash.
How often are the large cap, mid cap and small cap lists refreshed in India?
Every six months. Under SEBI's scheme categorisation framework, AMFI publishes the list of large, mid and small cap companies half-yearly, ranking every listed company by its average full market capitalisation over the preceding six months. The top 100 are large cap, the 101st to 250th mid cap, and the 251st onward small cap. A company can change band at any refresh without any change in its own business.
Does a share buyback reduce market capitalisation?
Mechanically, yes. A buyback extinguishes the shares repurchased, so the share count falls and, at an unchanged price, market cap falls by the value of the shares retired. The price rarely stays unchanged through a buyback, though, so the market cap observed afterwards reflects both the smaller share count and whatever the market made of the decision.
Is market capitalisation the amount of money a company has?
No. Market cap is what the market values the company's shares at, not cash the company holds or money it has raised. A company receives cash only when it issues new shares; the price at which shares change hands between investors afterwards never reaches its bank account. Cash and borrowings sit on the balance sheet, which is a separate document from the share price.
Disclaimer
Disclaimer: This article is for informational and educational purposes only and is not investment, financial, legal or tax advice. Multibagg AI does not recommend whether to buy, sell or hold any security. Figures are as of the dates stated and may change. Consult a SEBI-registered investment adviser before making any investment decision.
Aaditya Aanand is the founder and CEO of Multibagg AI. An IIT Kanpur alumnus, he has worked across technology and financial markets at Goldman Sachs and American Express. His writing explores investing, markets and AI.