Quick explanation: Market capitalization, usually called market cap, is the total market value of a company's outstanding equity shares. It is calculated by multiplying the current price of one share by the total number of outstanding shares. Market cap lets you compare the size of listed companies; a higher share price on its own does not mean a company is larger.
The market cap formula
Share price is the current market price of one equity share.
Outstanding shares are all the equity shares currently held by shareholders, including promoters, institutions and retail investors.
Both inputs matter equally. A company's share price can be high because it has relatively few shares in issue, and low because it has a very large number of shares. Only the product of the two tells you what the market is valuing the whole company's equity at.
Why share price alone misleads
Suppose you are comparing two listed companies. Company A trades at ₹100 a share; Company B trades at ₹500. At first glance, B looks five times larger. But share price tells you the value of one share, not of the company. You also need the number of shares.
Company A: share price ₹100; outstanding shares 10 crore.
= ₹1,000 crore
Company B: share price ₹500; outstanding shares 1 crore.
= ₹500 crore
| Particulars | Company A | Company B |
|---|---|---|
| Share price | ₹100 | ₹500 |
| Outstanding shares | 10 crore | 1 crore |
| Market cap | ₹1,000 crore | ₹500 crore |
Conclusion: although Company B has the higher share price, Company A has twice the market value. Judging company size by share price alone is one of the most common beginner mistakes. The same logic explains why a ₹50 share is not automatically "cheap" and a ₹5,000 share is not automatically "expensive" — price per share says nothing about value until it is related to the share count and to the business's earnings.
What are outstanding shares?
Outstanding shares are the equity shares currently held by a company's shareholders. These may include promoters, retail investors, mutual funds, foreign institutional investors and other institutions.
| Shareholder category | Shares |
|---|---|
| Promoters | 6 crore |
| Retail and other public investors | 2 crore |
| Institutional investors | 2 crore |
| Total outstanding shares | 10 crore |
If the share price is ₹200:
= ₹2,000 crore
All outstanding shares are counted when calculating full market capitalization, including the shares held by promoters. That point becomes important later, because index providers adjust for promoter and other non-investible holdings when they calculate index weights.
Where to find the share count. A listed company's quarterly shareholding pattern, filed with the stock exchanges, shows the total number of shares and how they are split between promoter and public categories. The exchange's company page and the annual report also show the issued share capital.
How market cap changes
Market cap changes whenever the share price changes, even if the number of outstanding shares stays the same.
| Share price | Outstanding shares | Market cap |
|---|---|---|
| ₹100 | 10 crore | ₹1,000 crore |
| ₹120 | 10 crore | ₹1,200 crore |
| ₹150 | 10 crore | ₹1,500 crore |
| ₹80 | 10 crore | ₹800 crore |
If the share price rises from ₹100 to ₹150:
Market cap also rises by 50%, from ₹1,000 crore to ₹1,500 crore, assuming the share count is unchanged.
Market cap can also change when the share count changes:
New share issuance, such as a rights issue, a qualified institutional placement or shares issued on conversion of other instruments, increases the share count.
A buyback reduces the share count when the company purchases and cancels its own shares.
Splits and bonus issues change the number of shares but not the company's value. In a 1-for-2 split, each share becomes two and the price roughly halves, so market cap is essentially unchanged. A bonus issue works similarly.
What market cap does not mean
Market cap is not the cash in a company's bank account, its annual revenue, its annual profit, or its total enterprise value. It represents only the market value of the outstanding equity shares at the prevailing price.
Market cap versus enterprise value. Two companies with the same market cap can be very different businesses if one has large borrowings and the other has surplus cash. Enterprise value tries to capture this:
Enterprise value is used in ratios such as EV to operating profit. For banks and other financial companies, where borrowing is the raw material of the business, enterprise value is generally not used in the same way.
Market cap is not what you would receive if the company were sold. It reflects the price at which small quantities of shares recently changed hands. Buying a controlling stake would usually require paying a premium, and selling a very large block quickly could depress the price.
Market cap categories in India
Indian investors often hear about large-cap, mid-cap and small-cap companies. For mutual fund categorisation, SEBI's framework currently ranks listed companies by full market cap: broadly, the largest 100 are treated as large-cap, the next 150 as mid-cap, and the rest as small-cap. AMFI publishes the ranked list periodically, so a company can move between categories as its market value changes.
These labels describe size, not quality or risk on their own, although smaller companies have historically shown larger price swings and lower liquidity on average.
Why market cap matters for Nifty 50 analysis
Market cap is the starting point for comparing the relative equity-market size of companies. The combined full market cap of a group of companies is simply the sum of their individual market caps:
For example, in the indicative 13–15 October 2026 snapshot used on our Nifty 50 sector dashboard, the 50 companies' combined full market cap was about ₹183.31 lakh crore. That figure is a sum of full market caps; it is historical and indicative, not an official index statistic.
However, Nifty 50 index weights use free-float-adjusted market cap, not full market cap. A company with a large promoter holding counts for less in the index than its full market cap suggests. The next article in this series explains that adjustment and the Investible Weight Factor (IWF).
Key takeaways
- Market cap measures the current market value of a company's outstanding equity shares.
- Market Cap = Share Price × Outstanding Shares.
- A higher share price does not necessarily mean a larger company.
- Outstanding shares include promoter and public shareholdings.
- Market cap changes with the share price and with the share count; splits and bonuses change the count but not the value.
- Market cap is not cash, revenue, profit or enterprise value.
- Full market cap and free-float market cap are different concepts.
Source and example note: the numerical examples above are hypothetical teaching examples, not live company data. For Nifty 50 index methodology, refer to the current NSE Indices methodology documents.
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Frequently Asked Questions
What is market capitalization?
The total market value of a company's outstanding equity shares, calculated as the current share price multiplied by the number of outstanding shares.
Does a higher share price mean a bigger company?
No. A company with a lower share price but many more shares can have a larger market cap than one with a high share price and few shares.
Do promoter shares count in market cap?
Yes. Full market cap counts all outstanding shares, including promoter holdings. Free-float market cap, used for index weights, excludes non-investible holdings.
Does a stock split change market cap?
Not in itself. A split increases the share count and reduces the price proportionally, so the company's market value stays essentially the same.
Is market cap the same as enterprise value?
No. Enterprise value adjusts market cap for debt and cash, so companies with the same market cap can have very different enterprise values.
Related Reading
- Next: full vs free-float market cap
- Nifty 50 market cap by sector
- Relating market value to earnings
- Large, mid and small caps in detail
- Outstanding shares explained
- How buybacks reduce the share count
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