What market cap means

Market capitalisation (“market cap”) is the number behind every “large-cap,” “mid-cap,” and “small-cap” label you’ll see attached to a stock: the total value the market places on all of a company’s shares put together.

In India those labels have an official, rank-based meaning. SEBI (the Securities and Exchange Board of India, the markets regulator) set them in its categorisation circular of 6 October 2017 (SEBI/HO/IMD/DF3/CIR/P/2017/114), which ranks listed companies by full market cap:

Bucket Rank by full market cap
Large cap 1st to 100th
Mid cap 101st to 250th
Small cap 251st onwards

It’s a ranking, not a rupee cut-off. AMFI (the Association of Mutual Funds in India) publishes the ranked list every six months on its stock categorisation page, based on average market cap over the previous six months, and mutual funds use it to decide what counts as “large-cap” in their portfolios.

The formula

Market Cap = Price per Share × Shares Outstanding

Worked example: Desi Bites Foods Ltd

   
IPO Price ₹640
× Shares Outstanding (Lakh) 12.5
Market Cap ₹8,000 Lakh (₹80 Crore)

At ₹80 crore, Desi Bites Foods Ltd is a genuinely tiny listing. Ranked against thousands of listed companies, it would land far down the small-cap bucket — often informally called “micro-cap” at this size (that word has no official SEBI definition).

Worked example: Britannia Industries

Price is the 30 June 2025 NSE closing price used throughout this module. For illustration only.

   
Price (30 June 2025) ₹5,851
× Shares Outstanding (Crore) 24.09
Market Cap ₹1,40,951 Crore

At roughly ₹1.4 lakh crore, Britannia is about 1,760 times Desi Bites’ market cap. Its official bucket isn’t set by that rupee figure, though — it comes from where it ranks on AMFI’s half-yearly list for the period in question. The gap between the two companies’ size (revenue, assets, market cap) is enormous, even where — as several earlier posts showed — some of their underlying ratios landed surprisingly close together.

Common mistakes

  • Confusing market cap with enterprise value. Market cap only prices the equity — it ignores debt and cash entirely, which is exactly why EV exists as a separate, fuller measure of what it would cost to buy the whole business.
  • Confusing market cap with revenue or total assets. These are completely different things measured on different statements — market cap is purely the market’s opinion of what the equity is worth, not a figure that appears anywhere on the company’s own financials.
  • Assuming a bigger market cap always means a safer investment. Size and safety aren’t the same thing — a large-cap company can still carry real risk, and a small-cap can be genuinely well-run.
  • Treating market cap as fixed. It moves every single trading day as the share price moves, without anything about the underlying business necessarily changing — it’s a live market opinion, not a stable characteristic of the company.
  • Mixing up full and free-float market cap. Index providers such as NSE weight stocks by free-float market cap, which leaves out shares that rarely trade (like promoter holdings). SEBI’s size buckets use full market cap, so the two can differ a lot for a closely held company.

Takeaway: market cap is simply price times shares outstanding — the market’s running verdict on what a company’s equity is worth. It’s useful for gauging size, but silent on debt, cash, or whether that price makes sense.