What is Exposure Margin? A Simple Guide
Exposure margin is an additional margin charged on top of SPAN margin as an extra buffer against market risk. It provides a cushion beyond the core risk-based requirement. Together, SPAN and exposure margin make up the total margin needed to hold a position.
Exposure margin is the second layer of margin in derivatives, sitting on top of SPAN margin as a safety cushion. Together they set the total capital a trade needs.
Knowing about it helps you plan capital accurately. This explainer keeps the language simple and the examples Indian. You can see margin details on Stockk.
Key Takeaways
- Exposure margin is an extra buffer on top of SPAN.
- It cushions against extreme moves and gaps.
- It is typically a percentage of contract value.
- Total margin is SPAN plus exposure.
- It raises the upfront capital needed.
Why is exposure margin charged?
Exposure margin adds a safety cushion above the SPAN margin, protecting against extreme moves and gaps that the core model might not fully capture. It is typically a percentage of the contract value. This extra layer strengthens the system against unexpected volatility.
Continuing the same example, the stock future has a contract value of ₹6,00,000 and a SPAN margin of about ₹72,000. The exchange adds an exposure margin of roughly 3 percent of contract value, which is ₹18,000. Your total requirement is 72,000 + 18,000 = ₹90,000, or about 15 percent of the contract value. Planning capital on the SPAN figure alone would leave you ₹18,000 short before the position is even opened.
How exposure margin affects capital
Because total margin is SPAN plus exposure margin, you must account for both when planning capital. The exposure component increases the upfront requirement beyond the core risk margin. Understanding it prevents underestimating the capital a position needs.
Total margin breakdown
| Component | What it covers |
|---|---|
| SPAN margin | Core, risk-based worst-case loss |
| Exposure margin | Extra buffer for gaps |
| Total | Both, held together |
Planning for it
When sizing a position, always add the exposure margin to the SPAN margin to know the real capital required. Keeping some spare beyond this avoids a shortfall if margins rise, which can happen when volatility increases.
Want to apply this? Trade futures and options on Stockk, open a free demat account, and keep exploring the Knowledge Center for deeper dives.
Futures and Options are leveraged products and carry a high risk of loss that can be more than the money you put in. This article is only for learning and is not a recommendation to trade in derivatives.
Frequently Asked Questions
What is exposure margin?
It is an extra margin buffer charged on top of SPAN margin, cushioning against extreme moves. Both form the total margin.
Why is exposure margin needed?
It protects against gaps and extreme volatility beyond the SPAN model, acting as a safety layer that strengthens the system.
How is total margin calculated?
It is SPAN margin plus exposure margin, both of which must be available to cover the position.
Does exposure margin vary by contract?
Yes, it is typically a percentage of contract value and varies by instrument, so riskier contracts need more.
How do I plan for exposure margin?
Account for both SPAN and exposure when sizing positions to avoid shortfalls.
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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