Naked Option

The intuition

Writing an option is selling insurance. A covered writer has the asset the policy is written on, so a claim is paid from something already owned. A naked writer has only the premium. If the claim comes, the writer must buy the asset at the market and hand it over at the strike, or pay the difference in cash. The premium is the most the writer can ever make; the claim has no ceiling. That asymmetry is why the exchange demands a margin deposit that grows as the option moves against the writer, and why most of the large single-day losses in retail options trading involve naked short positions.

The attraction is real: most options expire worthless, and a naked writer who sells far from the market collects small, frequent premiums. The problem is the frequency of the loss, not its existence; one gap can return years of premium.

Formula (per unit; multiply by lot size)

Naked call profit at expiry = premium − max(S − K, 0); loss is unbounded as S rises

Naked put profit at expiry = premium − max(K − S, 0); maximum loss = K − premium, if S falls to zero

Margin = SPAN (portfolio risk over a one-day move set by the clearing corporation) + exposure margin (a fixed percentage of notional), both blocked up front and recomputed as prices move; see initial margin and exposure margin

Worked example (illustrative prices)

Suppose NIFTY is at 24,000 with seven days to expiry and a trader writes one lot (65 units) of the 24,400 call at ₹57, collecting ₹3,705. The broker blocks an illustrative margin of about ₹1.1 lakh.

Scenario	NIFTY at expiry	Call value	Writer’s P&L per lot
Drifts sideways	24,100	0	+₹3,705 (full premium)
Rallies to the strike	24,400	0	+₹3,705
Break-even	24,457	57	₹0
Gaps up on news	24,900	500	−₹28,795
Large gap	25,400	1,000	−₹61,295

In the fourth row a 3.75% rise, well within what the index has done in a single session on several occasions, costs nearly eight times the premium collected. In the fifth row, a 5.8% rise costs over sixteen times. The margin blocked at entry would not cover the last row; the broker issues a margin call or squares the position during the session, often at the worst price of the day. A bear call spread that bought the 24,700 call for ₹18 would have collected ₹2,535 instead of ₹3,705 and capped the loss at ₹16,965 in every scenario.

Why it matters

• Margin is the binding constraint, not premium. A naked NIFTY option ties up well over a lakh of margin to collect a few thousand rupees, and the margin rises as the option goes against you.
• Expiry day is more expensive. Since 20 November 2024, SEBI requires an additional 2% extreme loss margin on short index options on the day they expire, so the margin for a naked expiry-day write jumps in the morning.
• Stock options deliver. A naked short stock put that finishes in the money results in delivery of the shares; a naked short stock call requires delivering shares you do not own. See physical settlement.
• Correlation hurts in a crash. Several naked puts across different stocks are one position in a market-wide fall; the diversification is illusory.

Common mistakes

• Sizing by premium collected rather than by the loss at a two-sigma move.
• Selling far strikes for a few rupees and ignoring that the loss at the first gap exceeds a year of such premiums.
• Treating a stop-loss as protection. In a gap the stop releases a limit order that fills far from the trigger, or not at all; see GTT order.
• Writing into events. Earnings, RBI policy and the Budget are exactly when implied volatility is high and the naked premium looks richest.

Indian specifics

NSE Clearing charges SPAN margin computed over the worst of 16 price-and-volatility scenarios plus an exposure margin on the notional, recomputed several times a day, with SEBI’s peak-margin rule (full upfront margin since September 2021) removing the old practice of intraday leverage. Short index options carry the additional 2% ELM on expiry day. Short collection penalties of 0.5% to 5% apply when the margin blocked falls short of the requirement. Most brokers also apply their own risk limits on naked writing, including blocking far-expiry naked positions or requiring higher margin than the exchange minimum. Stock options are physically settled, so brokers raise margins on in-the-money naked stock options in the expiry week; see delivery margin.

FAQ

What is a naked option?

A sold call or put with no hedge behind it: fixed premium in, unlimited or near-unlimited loss out.

How much margin is needed to sell a naked Nifty option?

SPAN plus exposure margin, often over a lakh per lot near the money, rising as the market moves against you, plus 2% ELM on expiry day.

Why is a naked call riskier than a naked put?

A call’s loss has no ceiling; a put’s is capped at the strike. Both can exceed margin in a gap.

What is the difference between a naked option and a covered option?

A covered writer holds something that pays the claim; a naked writer has only the premium.

Can I sell naked options on stocks in India?

Yes, with full margin, but stock options deliver shares at expiry, and brokers raise margin or square off in expiry week.

Related terms

• Option writer, the seller’s obligations
• Initial margin, what is blocked
• Margin call, what happens when it is not enough
• Covered call, the covered alternative
• Physical settlement, stock delivery risk
• Defined vs undefined risk, the framework