Investing · 6 min read
Share price vs market cap: why a costly share is not a big company
One MRF share cost about 99 times a Reliance share. Reliance was about 32 times the bigger company. What a share price actually tells you, and what it does not.
Krish Dalal
Founder and editor, PaisaExpert. Master's in Business Management, SP Jain School of Global Management, London. · Last updated 2026-09-15
Most people meeting the stock market for the first time read the share price as a kind of rating. A share in the thousands feels like a premium company and a share in the tens feels like a small one. The price is doing no such thing. It is only telling you how finely the company has been cut up.
The one formula that matters
Market capitalisation is the share price multiplied by the total number of shares in issue. It is what the stock market is valuing the whole company at, on that day. Change either number and the result changes, which is why the price on its own tells you almost nothing about size.
| On 8 September 2026 | MRF | Reliance Industries |
|---|---|---|
| Price of one share | About ₹1,28,875 | About ₹1,300 |
| Shares in issue | Around 42 lakh | Well over 1,300 crore |
| Whole company (market cap) | About ₹55,111 crore | About ₹17,80,882 crore |
Reliance has more than 3,000 times as many shares as MRF. So even though each Reliance share is priced at roughly a hundredth of an MRF share, the company as a whole comes out far larger. The expensive share belongs to the smaller company.
Splits and bonuses change the price, not the company
A company can decide to cut each existing share into several smaller ones, called a stock split, or hand shareholders extra shares for free, called a bonus issue. Either way the number of shares goes up and the price of each one falls to match. The company is worth exactly what it was the moment before. A share that suddenly looks affordable after a split has not become better value. It has only been sliced more finely.
What a low share price does not tell you
- It does not tell you the company is small. A low price can belong to one of the largest companies in the country.
- It does not tell you the share is cheap. Whether a price is high or low relative to what the business earns is a separate question, usually looked at through measures like the price to earnings ratio.
- It does not tell you there is more room to rise. A ₹10 share and a ₹10,000 share move by percentages, not by rupees, and neither has any built-in reason to grow faster.
- It does not tell you the risk. Some very low-priced shares belong to thinly traded companies where prices can swing sharply on small amounts of trading.
The feeling that a low-priced share is a bargain is a feeling about the slice. It is not a measure of the company, and it is worth noticing when that feeling is doing the deciding.
Owning a slice of the big companies with any amount
A high share price can make a single share feel out of reach. Index funds and diversified mutual funds hold shares of large listed companies in proportion to their size, so any amount you put in owns a matching sliver of each. The price of one individual share stops mattering at all.
What to do next
- Next time a share price looks high or low, look up the company's market capitalisation beside it.
- Treat price per share as a description of the slice, and market cap as the description of the company.
- Read our guide to the Nifty 50 and Sensex to see how market capitalisation decides which companies move an index most.
Figures as on 8 September 2026. This is an explanation of how share prices work, not a recommendation to buy or sell any security.