"Bank Nifty is up", "IT stocks are dragging the market", "pharma is outperforming". Market news is full of references to sectoral indices, and many investors read them as a quick summary of how a whole industry is doing. That shortcut is useful, but it can also mislead.
Nifty Bank, Nifty IT and Nifty Pharma each hold a fixed, small number of companies, chosen and weighted by specific NSE rules. A handful of large stocks can drive most of the movement, and some companies you might expect to see are not included at all. Knowing the rules tells you what the number on your screen really measures.
This guide explains how NSE builds these three indices, what each one includes and leaves out, and how to read them sensibly. Figures are taken from NSE's index factsheets as on August 31, 2026. This article is educational and is not investment advice.
A stock market index is a basket of stocks whose combined value is tracked as a single number. Broad indices such as the Nifty 50 cover companies across the economy. A sectoral index narrows the basket to companies from one industry, so its movement reflects how that group of stocks is performing.
NSE Indices Limited, a subsidiary of the National Stock Exchange, maintains the Nifty family of indices, including Nifty Bank, Nifty IT and Nifty Pharma. Each has a published methodology that sets how many stocks it holds, which companies qualify, how they are weighted and when the index is reviewed. BSE maintains its own sectoral indices, such as BSE Bankex, with separate rules.
If you are new to indices, our guides on Nifty and Bank Nifty and the difference between Nifty and Sensex cover the basics.
Quick take
Nifty Bank, Nifty IT and Nifty Pharma follow broadly the same selection process, set out in their NSE factsheets.
Step 1: Start with the Nifty 500
A company must be part of the Nifty 500 at the time of review. If there are too few eligible companies from the sector in the Nifty 500, NSE fills the gap from the top 800 stocks ranked by average daily turnover and average daily full market capitalisation.
Step 2: Belong to the right sector
The company must be classified in the relevant sector, which is banking, IT or pharmaceuticals. Classification is based on the company's main line of business.
Step 3: Pass the liquidity checks
The stock must have traded on at least 90% of trading days in the last six months and must have been listed for at least one month as on the cut-off date.
Step 4: Select the largest
From the eligible companies, NSE selects the largest by free-float market capitalisation until the index is full: 14 stocks for Nifty Bank, 10 for Nifty IT and 20 for Nifty Pharma. Preference is given to stocks available for trading in NSE's Futures & Options segment.
Step 5: Review twice a year
The indices are reviewed semi-annually, using six-month average data up to the cut-off dates of January 31 and July 31. NSE gives the market four weeks' notice before changes take effect.
Choosing the stocks is only half the story. How much each one counts decides how the index moves.
All three indices are weighted by free-float market capitalisation. Free float counts only the shares available for public trading and excludes those held by promoters, including the government. A bank with a large government holding will therefore carry less weight than its total market value suggests. For example, State Bank of India is one of the country's most valuable banks, but its weight in Nifty Bank was about 10% in August 2026, below that of HDFC Bank and ICICI Bank.
Caps are applied at each rebalance. Between reviews, weights drift with share prices, so a strong rally in the largest stock can push its weight above the cap until the next rebalance brings it back.
Quick take
The table below compares the three indices using NSE's factsheets as on August 31, 2026. Weights change daily with share prices and at every review, so treat these as a snapshot.
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The contrast in concentration is striking. Nifty IT has the fewest stocks and its top three make up about 61% of the index, while Nifty Pharma spreads its weight across 20 companies. Company names are shown only to explain how the indices are built and are not recommendations.
An index name suggests a whole industry, but each one draws its boundary in a specific place.
Nifty Bank covers banks only: large private banks, public sector banks and, in the current list, a small finance bank. It does not include non-banking financial companies, insurers, asset managers or brokers, even though they are all part of financial services. Those are covered by broader indices such as Nifty Financial Services. NSE also publishes separate Nifty Private Bank and Nifty PSU Bank indices for investors who want to track one type of bank.
In practice, Nifty Bank reflects the fortunes of the largest private banks. In August 2026, HDFC Bank, ICICI Bank, Kotak Mahindra Bank and Axis Bank together made up about half of the index.
Nifty IT is essentially an index of Indian IT services and software companies, most of which earn the bulk of their revenue from clients in the US and Europe. Its movement therefore tends to reflect global technology spending, deal wins and the rupee-dollar exchange rate more than the Indian economy. Consumer internet and platform companies are not part of it; NSE tracks them through separate thematic indices.
With only 10 stocks and Infosys and TCS together at about 49% in August 2026, Nifty IT is the most concentrated of the three.
Nifty Pharma covers pharmaceutical companies, including formulation makers that sell branded and generic medicines in India and abroad, and companies focused on active pharmaceutical ingredients and contract manufacturing, such as Divi's Laboratories and Laurus Labs. Hospitals and diagnostic chains are not included; they are covered by the broader Nifty Healthcare index.
Because many large pharma companies sell heavily in the US generics market, the index is also influenced by US drug pricing and regulatory inspections, not just domestic demand.
Because sectoral indices hold a limited number of stocks and weight them by size, the headline number can tell a different story from the sector as a whole.
Scenario: In a particular month, Infosys and TCS, which together make up about 49% of Nifty IT, each fall 6% after cautious outlook comments. The other eight constituents, making up the remaining 51%, rise by an average of 4% on strong deal wins.
The Process: The index change is roughly the weighted average of its constituents' moves: 49% of a 6% fall is about 2.9 percentage points down, and 51% of a 4% rise is about 2 percentage points up. The net result is a fall of about 0.9%.
The Resolution: The headline reads "IT index falls", even though eight of the ten stocks rose. An investor who looks only at the index might conclude the whole sector had a bad month. An investor who checks the constituents sees that the fall came from two very large companies, while the rest of the group did well. Looking at how many constituents rose and fell, not just the index level, gives a truer picture.
Sectoral indices serve several purposes, and it helps to know which one you are relying on:
Important: a sectoral index or fund concentrates your money in one industry and, often, in a few large companies within it. That means higher risk than a diversified portfolio: a single regulatory change, a global slowdown in one industry or a setback at one large company can hit the whole holding. Actively managed sectoral funds must invest at least 80% of their assets in their chosen sector under SEBI's scheme categorisation rules, but they can choose different stocks and weights from the index. See our guide to mutual fund categories for how they fit in.
This article is educational and does not constitute investment advice. Consider your goals and risk tolerance, and consult a SEBI-registered adviser before investing.
Sectoral indices are useful, but they are most useful when you know what sits inside them. Check the constituents and weights before you draw conclusions about a sector, or before you invest in a fund that tracks one. Open a demat and trading account with Nirmal Bang to follow the markets and invest in stocks, ETFs and mutual funds from one place.
According to NSE's factsheets as on August 31, 2026, Nifty Bank has 14 stocks, Nifty IT has 10 and Nifty Pharma has 20. The number is fixed by each index's methodology, so these indices cover only the largest and most liquid companies in their sectors, not every listed company.
No. Nifty Bank includes only banks, including private sector banks, public sector banks and small finance banks. Non-banking financial companies, insurers and asset managers are covered by broader indices such as Nifty Financial Services.
NSE weights sectoral indices by free-float market capitalisation, which excludes shares held by promoters, including the government. Weights are also capped at each rebalance. A company with a large promoter holding, or one that hits the cap, will therefore have a lower weight than its total market value suggests.
Twice a year. NSE reviews Nifty Bank, Nifty IT and Nifty Pharma using six-month average data up to the cut-off dates of January 31 and July 31, and gives the market four weeks' notice before any change takes effect.
No. A sectoral index fund or ETF replicates an index such as Nifty Bank and holds the same stocks in the same proportions. An actively managed sectoral fund must invest at least 80% of its assets in its chosen sector, but the fund manager decides which stocks to hold and in what weights, and may hold companies outside the index.
Because the index is weighted by size. In the August 2026 factsheet, Infosys and TCS together made up about 49% of Nifty IT. If those two fall while most smaller constituents rise, the index can still end lower, even though more stocks went up than down.
Nifty Bank, Nifty IT and Nifty Pharma are rule-based baskets of the largest, most liquid companies in each sector, weighted by free-float market capitalisation and capped so no single stock dominates entirely. They are excellent quick indicators, but they measure those selected stocks, not the entire industry. Your next step: before reading too much into a sector's move, or investing in a fund that tracks one, open the latest NSE factsheet, check the constituents and weights, and see which companies are really driving the number. When in doubt, a SEBI-registered adviser can help.