Index options vs stock options.

Same exchange. Same trading hours. Same broker. Almost everything else is different. Index options and stock options have diverged enough in Indian markets that they're effectively different products. This guide lays out the differences that actually affect your trades.

At a glance

Settlement — the biggest difference

Index options: cash settled

NIFTY, BANKNIFTY, SENSEX and all other Indian index options are cash-settled in INR. If you let an ITM contract expire, the exchange credits/debits your account with the intrinsic value. No share delivery. No surprise positions. Clean.

Stock options: physically settled

Since the 2018 SEBI mandate, all single-stock F&O contracts are physically settled. The implications are big:

• An ITM call at expiry → you receive the underlying shares (and pay strike × lot × number of contracts).
• An ITM put at expiry → you deliver the underlying shares (broker buys them from market if you don't have them, at your cost).
• A short ITM call expiring → you deliver shares; if you don't own them, broker buys to deliver.
• A short ITM put expiring → you receive shares; you pay full strike × lot.

Liquidity

Index option liquidity is extreme

NIFTY weekly options trade tens of millions of contracts per session. BANKNIFTY monthly is the second-most liquid options product in the world by some measures. Spreads on ATM NIFTY options are sub-1-rupee most of the time. You can trade in size without moving prices.

Stock option liquidity is bimodal

The top 15–20 stock F&O contracts (Reliance, HDFCBANK, ICICIBANK, INFY, TCS, etc.) have decent liquidity. The rest are sparse — OTM strikes can have wide spreads, sometimes no current quotes at all. Stocks in the F&O ban list become illiquid quickly during the ban period.

Trading less-liquid stock options as a buyer often means paying inflated theoretical premium; as a seller, you may not get filled near fair value. Both ends of the trade lose to liquidity drag.

Expiry mechanics

Detailed timings and holiday adjustments: see option expiry mechanics.

Margins

Margin requirements differ structurally:

• Index option writers: Margin based on SPAN + Exposure. The volatility component is generally lower for indices than for stocks (basket diversifies away single-name risk).
• Stock option writers: Margin includes a stock-specific volatility component plus surveillance/event margin. Higher than index per equivalent notional, especially for high-beta stocks.
• Physical delivery margin: For stock options held into the final week before expiry, NSE imposes additional "physical settlement margin" that ramps up daily. Catches retail off guard.
• Buyers: Same on both — full premium upfront, no ongoing margin.

F&O ban list

Single-stock F&O contracts are subject to the F&O ban list — if aggregate OI crosses 95% of MWPL, no fresh positions allowed. This can happen multiple times a month for popular F&O stocks.

Index options are not subject to MWPL-style bans. NIFTY, BANKNIFTY and other indices can have unlimited aggregate OI relative to their constituent baskets. This is a meaningful structural advantage of trading indices.

Volatility profile

Index volatility is the volatility of a basket. Stock volatility is single-name risk:

• NIFTY 50 volatility is structurally lower than any single constituent because of diversification. Realized vol of NIFTY runs ~13–18% annualized in normal regimes; many constituents run 25–40%.
• Stock options' IV is correspondingly higher. Premium income for writers is richer in stock options but so is the catastrophic-event risk.
• Earnings, dividends, results, M&A, regulatory news — single stocks have idiosyncratic gap risk that indices smooth out.

News and event sensitivity

• Index options react to macro events: RBI, Fed, US CPI, GDP, geopolitical. Election cycles, budget day, monetary policy.
• Stock options react to all the above plus earnings, board meetings, ratings actions, regulatory orders, M&A — and these are stock-specific events with binary outcomes.

The skew in stock option IV around results often reaches 50%+ for upcoming events. Index option IV rarely spikes that way unless a macro shock is imminent.

Cost structure

• STT, exchange charges, GST and SEBI charges apply to both.
• Stock options' STT on physical delivery (if held to expiry) is materially higher than cash-settlement STT on index — a key reason most stock-option positions are closed before expiry.
• Brokerage rates are typically the same per lot across index and stock options at most discount brokers (₹20 per executed order or similar).

When to use which

Trade index options when

• You have a directional view on the broad market, sector, or bank index.
• You want to scalp short-dated weeklies — only NIFTY and SENSEX offer this.
• You need maximum liquidity and tight spreads.
• You don't want delivery risk or physical-settlement complications.
• You're hedging a diversified portfolio.

Trade stock options when

• Your edge is in single-name analysis — earnings, fundamentals, technicals.
• You want to play idiosyncratic event risk (binary outcomes).
• You're hedging a concentrated single-stock position.
• You're writing premium and the stock-specific IV is rich enough to compensate for the higher risk.
• You're prepared to manage physical delivery if held to expiry.

Common mistakes

"Treating stock options like index options"

Holding stock options to expiry without realizing physical settlement applies. Then waking up to share positions, margin calls, or buy-side STT bills.

"Ignoring liquidity outside the top names"

Buying OTM options in mid-cap F&O stocks at the "screen price" only to discover the screen price wasn't tradeable. You paid the offer to the only writer in the book.

"Assuming stock IV mean-reverts like index IV"

Stock IV often stays elevated through events. Selling stock IV based on "index-style" mean-reversion logic blows up when the news arrives.

"Mistaking F&O ban for a tradeable signal"

Ban only restricts fresh F&O positions. The cash market keeps trading. Don't confuse "in ban" with "no movement allowed."

FAQ

What's the difference between index and stock options?

Index options are on a basket and cash-settled. Stock options are on a single company and physically settled in India since 2018.

Are stock options in India physically settled?

Yes, since the 2018 SEBI mandate. ITM stock options expire into share delivery.

Why are index options more popular?

Better liquidity, weekly expiry availability (NIFTY, SENSEX), no physical-delivery risk, broader exposure.

Can index options enter F&O ban?

No. The F&O ban list applies only to single-stock contracts.

Do stock options have weekly expiry?

No. Stock options have monthly expiry only — last Thursday of each month.

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