# Index Weightage — StockMojo

> Nifty composition by sector and weightage

- Live page: https://stockmojo.in/index-weightage
- Content last updated: 2026-04-21
- Platform: StockMojo — free options analytics for Indian markets (NSE F&O)

This is a machine-readable markdown mirror of the live tool page. The live page shows real-time NSE data during market hours (09:15-15:30 IST) and supports 200+ F&O symbols via per-symbol URLs like https://stockmojo.in/index-weightage/banknifty.

## Frequently asked questions

### What is index weightage?

Index weightage is the percentage each constituent stock represents within an index. In Nifty 50 for example, HDFC Bank holds roughly 11%, Reliance about 9%, and Infosys about 6% — these weights determine how much each stock's price movement affects the headline index number.

### How are Nifty 50 weights calculated?

Nifty 50 uses free-float market capitalization weighting. Each stock's weight equals its free-float market cap divided by the sum of all 50 stocks' free-float market caps, expressed as a percent. The weights shift daily as prices move and are rebalanced quarterly by the index committee.

### Why do the top 10 stocks matter so much?

The top 10 Nifty 50 stocks typically account for 55-60% of the index. When these heavyweights move strongly in one direction, they can single-handedly drive Nifty even if the remaining 40 stocks are flat. Understanding this concentration is essential for correctly interpreting index moves.

### Which indices can I check weightage for?

We cover all major NSE indices: Nifty 50, BankNifty, FinNifty, MidcpNifty, Nifty Next 50, Sensex, and the major sectoral indices (IT, banking, auto, pharma, metals, FMCG, realty, PSU bank, private bank). Each has its own constituent weightage table.

### How often do weights change?

Weights drift continuously with price movements — if Reliance outperforms the rest of Nifty over a month, its weight rises mechanically. Formal rebalancing happens quarterly when the index committee reviews eligibility criteria and may add or remove constituents. Major rebalances can shift weights by 0.5-1.5% for some names.

### How does weightage affect my options trading?

It determines how much a stock-specific event (e.g., HDFC Bank results) will move the index. If you're selling Nifty puts expecting stability, but heavyweight HDFC Bank reports weak results, the index can drop sharply even if broader breadth is positive. Weightage awareness prevents this kind of surprise.

## How to use the Index Weightage tool

1. **Select an index** — Choose Nifty 50, BankNifty, FinNifty, or any sectoral index you want to inspect.
2. **Scan the top 10 weights** — The top 10 constituents typically drive most of the index move. Note which stocks dominate and at what weight.
3. **Check sector-wise rollup** — Group constituents by sector to see whether the index is tilted toward IT, banking, energy, or another sector — helps with sector rotation reads.
4. **Review live impact** — The live impact column shows each stock's contribution to today's index move based on current price change × weight.
5. **Apply to your strategy** — When planning Nifty options, check whether your thesis depends on heavyweight names cooperating. If heavyweights are likely to diverge from broad breadth, adjust strikes or size.

## Related tools

- [Index Contributors](https://stockmojo.in/index-contributors) — markdown: https://stockmojo.in/index-contributors.md
- [Advance Decline Ratio](https://stockmojo.in/advance-decline) — markdown: https://stockmojo.in/advance-decline.md
- [Market Movers](https://stockmojo.in/market-movers) — markdown: https://stockmojo.in/market-movers.md

## Glossary

Terms used: index-weightage, free-float-mcap, heavyweights. Definitions: https://stockmojo.in/glossary