Index derivatives are F&O contracts on a market index like the Nifty 50 or Sensex; stock derivatives are contracts on an individual company's shares. The practical differences show up at expiry (cash versus physical settlement), in ban periods (stocks only), and in liquidity.
What's the underlying in each case?
A stock derivative tracks one company. A futures or options contract on, say, Bharat Paints Ltd rises and falls with that single share, its results, its news.
An index derivative tracks a basket. The Nifty 50 is a number computed from fifty large stocks. You can't hold "one Nifty" in your demat account, but you can trade contracts on where that number goes. (If indices themselves are new to you, start with What is a market index (Nifty 50 or Sensex)?) One consequence follows immediately: a single company's bad quarter can gap its own stock sharply, while an index dilutes any one company's shock across the basket. Diversified is not the same as safe, though. Indices fall hard too, and leverage magnifies index moves just as brutally.
How does settlement differ at expiry?
This is the difference that costs unprepared traders the most money.
- Index derivatives are cash-settled. There's nothing to deliver, if your position is in-the-money at expiry, the difference is paid in cash; if not, it expires worthless. Clean, bounded by the contract maths.
- Stock derivatives are physically settled. Hold a stock futures position or an in-the-money stock option into expiry and you can be obligated to give or take delivery of the actual shares, a transaction worth the full contract value, far beyond your margin. The details are in What is physical settlement in stock F&O?
What is a ban period, and why doesn't it apply to indices?
Each stock in the derivatives segment has a market-wide position limit, a ceiling on total open positions across the market. When open interest in a stock crosses the trigger level, the stock enters an F&O ban: traders may only reduce existing positions, not create fresh ones, until OI cools off. What you can and can't do during one is covered in What are the trading restrictions during an F&O ban?
Index derivatives never enter such bans. The ban framework exists to stop excessive positioning in a single company's contracts, and doesn't apply to broad indices.
How do the two compare overall?
| Index derivatives | Stock derivatives | |
|---|---|---|
| Underlying | A basket (Nifty 50, Sensex, …) | One company's shares |
| Settlement at expiry | Cash | Physical delivery possible |
| F&O ban periods | Never | Yes, when position limits are breached |
| Liquidity | Benchmark index contracts are among the most traded | Varies widely, a few very liquid names, many thin ones |
| Single-company shock | Diluted across the basket | Full, direct impact |
The liquidity row deserves a beginner's attention: benchmark index options are typically the most liquid contracts in the market with tight spreads, while many individual stock options trade thinly, wide bid-ask gaps, stale quotes, and painful exits. Liquid, however, cuts both ways: the ease of trading index options is precisely what tempts overtrading in them.
Things to keep in mind
- Index F&O settles in cash; stock F&O can end in physical delivery. Never hold stock derivatives into expiry casually.
- Only stocks enter F&O bans; check whether a stock is in the ban list before planning fresh positions in it.
- Thinly traded stock options can be expensive to exit. Check volumes and spreads, not just the premium.
- Both index and stock derivatives are leveraged instruments where losses can exceed margin; see What are the risks of trading Futures and Options (F&O)?
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