Understanding Additional Exposure Margin on MWPL Securities

04 Jun 2026|

2 min read |

by ICICI Securities Team

Clearing Corporations introduced a dynamic risk-control mechanism called Additional Exposure Margin (AEM) on select Derivative securities where market positions are highly concentrated among a few participants.

Hence, in accordance with NSE circular No. NCL/CMPT/70221, issued September 16, 2025, concerning the Exposure Margin of security under Market Wide Position Limit (MWPL), the Exchange now imposes an Additional Exposure Margin @15% in Equity Derivatives segment on securities where top 10 clients, together account for more than 20% of MWPL.

However, for securities wherein Additional Surveillance Margin (ASM) is applicable, whichever is higher of Additional Exposure Margin (AEM) as stated above or Additional Surveillance Margin (ASM) shall be levied. Scripts shall be identified under this framework based on 3 months rolling data and shall be reviewed on a monthly basis.

Why Has Additional Exposure Margin Been Introduced?

Clearing Corporations such as NSE Clearing Limited (NCL) and Indian Clearing Corporation Ltd. (ICCL) introduced the 15% Additional Exposure Margin as a strategic risk management tool to address specific vulnerabilities in the derivatives market through various parameters. One such key parameter is Market Wide Position Limit (MWPL). MWPL refers to the maximum open interest allowed in a stock’s futures and options.

What Triggers Additional Exposure Margin?

A security is shortlisted for Additional Exposure Margin when:

The top 10 clients collectively hold more than 20% of the MWPL in that security, based on 3-month rolling data, which indicates position concentration risk.

What Is Position Concentration Risk?

When a small group of participants holds a large share of derivative positions in a stock:

Price movement can become sharp if these positions unwind.
Liquidity may dry up suddenly.
Volatility can spike disproportionately.
Settlement risk for clearing corporations increases.
Instead of allowing stress to arise, the system proactively implements increased margin requirements.

What Exactly Has Changed?

If securities meet specific concentration criteria, an Additional Exposure Margin of 15% is levied. This is applicable in the Equity Derivatives segment only.

However, if the security already attracts an Additional Surveillance Margin (ASM), whichever is higher of either, ASM or 15% AEM, will apply.

How does this impact your margin requirement?

Earlier, you paid the standard exposure margin (plus other applicable margins). Now, if the stock you currently hold, is shortlisted under this new rule, an additional 15% exposure margin is added. Hence, higher upfront capital requirement i.e. an increase in the total margin required to hold positions.

Why Only Certain Securities?

This is not a general rise in margins for every stock. Securities enter the list when concentration crosses threshold and can exit when it normalizes. This ensures that risks are managed specifically without influencing the wider market.

Securities Identified Under the Framework:

This framework will apply immediately after the expiry of January 2026 derivative contracts. The list of securities is as follows:

Sr. No.	Symbol	Security Name
1	ABCAPITAL	Aditya Birla Capital Limited
2	AUROPHARMA	Aurobindo Pharma Limited
3	BANDHANBNK	Bandhan Bank Limited
4	CONCOR	Container Corporation of India Limited
5	CROMPTON	Crompton Greaves Consumer Electricals Limited
6	GLENMARK	Glenmark Pharmaceuticals Limited
7	IDEA	Vodafone Idea Limited
8	JSWENERGY	JSW Energy Limited
9	LICHSGFIN	LIC Housing Finance Limited
10	NBCC	NBCC (India) Limited
11	NMDC	NMDC Limited
12	PATANJALI	Patanjali Foods Limited
13	RBLBANK	RBL Bank Limited
14	SAIL	Steel Authority of India Limited
15	SAMMAANCAP	Sammaan Capital Limited
16	DLF	DLF Limited
17	MANAPPURAM	Manappuram Finance Limited
18	INDUSTOWER	Indus Towers Limited

As per NSE Clearing Limited Circular. No. 73313 dated 17 March, 2026, the above list has been extended to include 4 more securities, effective from 1 April, 2026, immediately after the expiry of the Mar 2026 contracts:

Sr. No.	Symbol	Security Name
1	ADANIENSOL	Adani Energy Solutions Limited
2	AMBUJACEM	Ambuja Cements Limited
3	INOXWIND	Inox Wind Limited
4	JIOFIN	Jio Financial Services Limited

Clearing corporations publish a list of impacted securities through official circulars and annexures. Since the list is dynamic and reviewed monthly, we recommend checking the latest circular updates available on Exchange websites.

Recommendations for a Trader:

Monitor margin requirements before initiating large derivative positions
Track MWPL levels in highly traded F&O stocks
Avoid over-leveraging in concentrated counters
Review circular updates periodically

Final Thoughts

The Additional Exposure Margin framework is a preventive, risk-sensitive mechanism designed to strengthen the derivatives ecosystem. While it may increase margin requirements for certain securities, it ultimately contributes to a more stable and resilient market environment.