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Who ranks where, why the order keeps changing, and how a trader can actually use this list.
Quick Answer: Reliance Industries is India's biggest listed company by market cap at roughly ₹16 lakh crore, followed by HDFC Bank, Bharti Airtel, ICICI Bank and State Bank of India. TCS, Bajaj Finance, Larsen & Toubro, LIC and Sun Pharma complete the top 10 on the latest data I checked (1 October 2026). Ranks change daily, so treat any list as a snapshot.
Definition: Market capitalisation (market cap) is the total market value of a company's shares: current share price multiplied by the number of shares outstanding. It measures a company's size in the stock market, not its profit or its quality.
When students ask me which are the biggest companies in India by market cap, they usually want one thing: a list they can trust. The honest answer is that the list is real, but it moves every trading day, and the gaps between some ranks are tiny. In this guide I give you the latest top 10, explain what drives the order, and show how I use it as a Nifty options trader. Browse more guides on the Trading Direction blog.
As of the latest screener data I checked on 1 October 2026, Reliance Industries leads with about ₹15.99 lakh crore, and the top 10 together are worth roughly ₹84 lakh crore. Figures below are from the Tickertape stock screener and may differ slightly from BSE or NSE data.
| Rank | Company | Sector | Market cap (₹ crore) |
|---|---|---|---|
| 1 | Reliance Industries | Oil & gas, retail, telecom | 15,99,546 |
| 2 | HDFC Bank | Private bank | 11,14,293 |
| 3 | Bharti Airtel | Telecom | 11,04,997 |
| 4 | ICICI Bank | Private bank | 9,27,638 |
| 5 | State Bank of India | Public bank | 8,90,478 |
| 6 | Tata Consultancy Services | IT services | 7,35,340 |
| 7 | Bajaj Finance | NBFC | 6,05,835 |
| 8 | Larsen & Toubro | Engineering, construction | 5,15,837 |
| 9 | Life Insurance Corporation of India | Insurance | 4,93,350 |
| 10 | Sun Pharmaceutical Industries | Pharma | 4,47,476 |
Market cap equals the current share price multiplied by total shares outstanding. A higher share price does not mean a bigger company. The screener data shows this clearly: Maruti Suzuki trades near ₹11,900 per share yet ranks around 20th with about ₹3.73 lakh crore, while HDFC Bank trades near ₹713 and is worth about ₹11.14 lakh crore. Splits and bonus issues change the share count and price, but not the company's size.
Ranks change because share prices change every second, and several positions are separated by very small gaps. In the data above, HDFC Bank and Bharti Airtel are only about ₹9,300 crore apart for the second and third spots, and a single trading day can swap them. A 22 September snapshot from the same source listed Airtel second, which shows how quickly this flips.
A fresh example is the National Stock Exchange (NSE). It listed on 24 September 2026 on BSE at ₹1,800 against an issue price of ₹1,785, and briefly entered the top 10 on listing day. Since then it has slipped to around ₹4.38 lakh crore, almost level with Hindustan Unilever, just outside the top 10. Notice that NSE shares listed only on BSE, because SEBI rules do not allow an exchange to list on its own platform.
Financial services dominate: HDFC Bank, ICICI Bank, SBI, Bajaj Finance and LIC together make up roughly 48% of the top-10 value, while Reliance alone is about 19%. That is my own calculation from the table above, so recheck it when the numbers move. Telecom (Airtel), IT (TCS), engineering (L&T) and pharma (Sun Pharma) fill the rest.
For traders this concentration matters: a few banks and Reliance can drag Nifty and Bank Nifty even when most other stocks are quiet.
I use the list as a map of where index-moving liquidity sits, not as a buy list. Concept: large caps carry high weight in indices, so their direction often decides whether a Nifty move is trustworthy. Since I like to trade options in Nifty 50, I check whether the heavyweights agree with the index before I take a trade.
Say your capital is ₹5,00,000 and you risk 1% per trade. That is ₹5,000. A stock breaks out at ₹1,000 with a stop loss at ₹980, so the risk is ₹20 per share and the quantity is 5,000 ÷ 20 = 250 shares. A target of ₹1,040 gives a reward of ₹40 per share, which is a 1:2 risk-reward ratio.
| Item | Illustrative value |
|---|---|
| Capital / risk per trade | ₹5,00,000 / ₹5,000 (1%) |
| Entry / stop loss / target | ₹1,000 / ₹980 / ₹1,040 |
| Risk per share / quantity | ₹20 / 250 shares |
| Maximum loss / planned reward | ₹5,000 / ₹10,000 |
| Risk-reward | 1:2 |
| Measure | What it tells you | Best used for |
|---|---|---|
| Market cap | Total value of all shares | Ranking company size |
| Free-float market cap | Value of shares available to the public | Understanding index weight |
| Traded turnover | Money changing hands in a day | Judging liquidity for entries and exits |
Reliance Industries is the biggest, at about ₹15.99 lakh crore on the latest data I checked. It also topped the weekly BSE-based rankings I reviewed from July and August 2026.
No. The top 10 is a ranking by size, while the Nifty 50 is an index of 50 large companies weighted by free-float market cap. A newly listed company can rank high by size before it qualifies for an index.
No. Market cap shows size, not value, growth or safety. You still need a plan with entry, stop loss and position size.
They use different timestamps, exchanges (BSE vs NSE) and share-count data. Always check the date and confirm on the exchange.
Every trading day, and the closest positions can swap within hours. Weekly market-cap reports are a convenient way to track it.
Start with price action, CPR and risk management on liquid stocks and indices. Our courses teach this step by step.
Use the market cap list to know where the money and liquidity are, then trade with your own rules. Check the date, compare market cap instead of share price, confirm heavyweight alignment before an index trade, and size every position from your stop loss. I also keep the weekly ranking on my watchlist, because a rank swap in the top 3 or around the tenth spot is a reminder of how fast sentiment moves.
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