Expiry, gap and settlement risks

In simple terms

Derivative positions can lose money not just through gradual price moves but through events: the final hours before expiry, prices that jump overnight, and settlement rules that turn a small position into a large obligation. These risks are concentrated in short periods and catch many traders off guard.

Expiry-day volatility

As expiry approaches, an option's time value shrinks towards zero, as the time value lesson explains. On expiry day, an option near the strike is almost all about whether the price ends above or below the strike.

Large positions, hedging flows and very short-dated options can make expiry days especially volatile, with sharp moves late in the day. The gamma lesson explains why option values become so sensitive near expiry.

Gap risk

Markets close overnight and at weekends, but news does not stop. When trading resumes, prices can gap, opening far from the previous close, as the gaps lesson explains.

• Stop-loss orders cannot protect against a gap: the first available price may be far beyond the stop.
• Short option and futures positions can lose many times their usual daily risk in one opening.
• Margin calls follow immediately.

Physical settlement

Some derivatives settle in cash: the difference in value is paid. Others settle physically: shares are actually delivered. Indian stock derivatives have used physical settlement under exchange rules; the details are set by the exchanges and SEBI and can change, so check the current contract specifications.

With physical settlement, an in-the-money position at expiry can mean:

• Long futures or long calls: buying the full quantity of shares, needing the full contract value in cash.
• Short futures or short calls: delivering shares you may not own.

A position held for a small premium or margin can suddenly require the full value of the shares, many times larger.

Assignment

When an option buyer exercises, a seller is assigned: required to fulfil the contract. For sellers of in-the-money options at expiry, assignment can mean large, sudden obligations, especially under physical settlement.

What happened to individual traders

SEBI's study of individual traders in equity futures and options, covering 2021-22 to 2023-24, found that 93% made losses, and that aggregate losses of individual traders exceeded ₹1.8 lakh crore over the three years. These findings describe the period studied. They show how leverage, costs, short-dated options and the risks in this lesson combine against most individuals, as the investing compared with trading lesson discusses.

Why it matters

Many derivative losses come not from slowly being wrong but from sudden events at expiry, overnight or at settlement. Knowing these risks, and the rules that govern settlement, prevents some of the most painful surprises.

Limitations

Settlement methods, expiry schedules, margin rules and position limits are set by exchanges and SEBI and change from time to time. The examples are simplified and ignore costs and taxes.

Common mistakes

• Holding near-the-money options into expiry without a plan.
• Assuming stop-losses protect against gaps.
• Not knowing whether a contract settles in cash or by delivery.
• Selling options without considering assignment.

Try it yourself

1. For a made-up call with strike ₹500, list its value at expiry for closing prices from ₹490 to ₹520.
2. Find the current settlement method for stock options on an exchange website.
3. Read SEBI's press release on its study of individual F&O traders and note two findings.