Market capitalisation explained

Price per share tells you nothing

A ₹50 stock is not cheaper than a ₹5,000 stock. Share price depends on how many shares exist; only market cap describes the size of the business.

This is the single most common beginner error, and screening by market cap rather than price fixes it immediately.

The three bands

Large caps are established, widely covered, and move with the index. Expect steadier returns, better liquidity and fewer surprises.

Mid caps sit between proven and growing — historically the band with the best risk-adjusted returns over long periods, and real volatility along the way.

Small caps offer the largest potential and the largest chance of permanent loss. Coverage is thin, liquidity dries up in downturns, and governance risk is highest.

Enterprise value: the fuller picture

Market cap ignores the balance sheet. Enterprise value adds net debt, which is why two companies with identical market caps can be valued very differently by an acquirer.

For leveraged businesses, EV/EBITDA can complement P/E when EBITDA is positive and consistently defined; a negative or zero multiple is not a cheap signal and should be shown as N/M while EBITDA and enterprise value are reviewed separately.

Using market cap in a screen

Set a floor that matches your risk tolerance and your ability to exit. Very small companies can be impossible to sell in size on a bad day.

Mixing bands deliberately — a large-cap core with a small mid and small-cap satellite — is a simpler risk control than trying to time between them.

Frequently asked questions

How is market cap calculated?

Current share price multiplied by total shares outstanding.

Are small-cap stocks better than large caps?

They have higher potential returns and materially higher risk, including illiquidity and governance issues. Neither band is universally better.

What is free-float market cap?

Market cap counting only shares available for public trading, excluding promoter and locked-in holdings. Most indices, including the Sensex and Nifty 50, use it.