# Index Contributors — StockMojo

> Stock-level contributions to index movement

- Live page: https://stockmojo.in/index-contributors
- 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-contributors/banknifty.

## Frequently asked questions

### What are index contributors?

Index contributors are the specific stocks pushing an index up or down by a given number of points. If Nifty 50 is up 120 points, the contributor tool shows exactly how many of those points came from Reliance, HDFC Bank, Infosys, etc. It decomposes index movement into stock-level attribution.

### How is a stock's point contribution calculated?

Contribution equals the stock's percentage move multiplied by its index weightage, then scaled to the index's current level. A 2% move in Reliance (about 9% Nifty weight) contributes much more than a 4% move in a smaller constituent. The tool does this math live for every stock.

### Why does this matter for traders?

Index moves look different depending on who's driving them. A 100-point Nifty rally with 70 points from Reliance alone is a narrow, heavyweight-led move likely to fade. A 100-point rally spread across 30+ stocks is broad-based and more durable. Contributor data reveals this distinction instantly.

### Can I see contributors in real time?

Yes. During NSE market hours (9:15 AM - 3:30 PM IST), contributor data updates every few seconds alongside live stock prices. Outside market hours, the last close snapshot is shown with a timestamp.

### Does this cover sectoral indices too?

Yes. In addition to Nifty 50 and BankNifty, the tool supports FinNifty, MidcpNifty, Sensex, and sectoral indices (IT, banking, auto, pharma, metals, FMCG). This is particularly useful for sector rotation traders tracking which names are actually driving sector-level moves.

### How do I use negative contributors?

Negative contributors show you which stocks are holding back the index. In a flat Nifty day where ADR looks strong, a heavy negative contributor (e.g., Reliance down 2%) might be the reason the headline index isn't rallying. Knowing this lets you trade around the laggard rather than blindly betting on the index.

## How to use Index Contributors

1. **Pick an index** — Choose Nifty 50, BankNifty, FinNifty, Sensex, or any sectoral index you want to decompose.
2. **Sort by positive contribution** — Identify the top contributors driving today's rally. Heavyweight concentration = narrow rally; broad participation = durable rally.
3. **Check the negatives** — Sort by negative contribution to spot laggards dragging the index. These are your short candidates or names to avoid on the long side.
4. **Compare with breadth** — Cross-reference with Advance Decline Ratio. When a 100-point rally comes from 5 stocks but most names are down, the rally is structurally weak.
5. **Refresh through the session** — Contributor rankings change as the day progresses. Check again late morning and late afternoon to catch rotation.

## Related tools

- [Index Weightage](https://stockmojo.in/index-weightage) — markdown: https://stockmojo.in/index-weightage.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-contribution, point-attribution, heavyweights. Definitions: https://stockmojo.in/glossary