Sebi Unveils Enhanced Stress Testing Methodologies for Equity Derivatives Segment

The Securities and Exchange Board of India (Sebi) has unveiled new stress testing methods for the equity derivatives market. These updates aim to better reflect evolving market conditions and evaluate associated risks. According to a circular, these methodologies will improve the calculation of the Minimum Required Corpus (MRC) for the Core Settlement Guarantee Fund (Core SGF).

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Previously, Sebi's guidelines from October 2023 outlined procedures for evaluating credit risk in clearing corporations (CCs). Stress testing was conducted using both historical and hypothetical scenarios. The updated methods introduce more comprehensive approaches to address market changes.

Enhanced Stress Testing Techniques

The new stress testing techniques include Stressed Value at Risk (VaR), which incorporates volatility from stress periods. Monte Carlo simulations are also used to estimate price movements, with option volatility increased by 100 per cent. Additionally, a filtered historic simulation adjusts past data to match current volatility using an Exponentially Weighted Moving Average (EWMA).

A factor model is employed to consider the highest three-day Nifty movements, adjusted by each stock's beta. This approach aims to provide a more accurate assessment of potential market risks. Clearing corporations are required to define, update, and review stress periods regularly, using a three-day Stress Period of Risk.

Managing Corpus Requirements

To address increased corpus requirements in equity derivatives, Sebi allows clearing corporations to transfer surplus funds from the equity cash segment (ECM) to the equity derivatives segment (EDX). However, specific conditions must be met. For instance, CCs must ensure that at least 50 per cent of the minimum required corpus is maintained in each segment.

These measures are designed to strengthen the financial resilience of clearing corporations and ensure they can handle potential market disruptions effectively. By implementing these robust methodologies, Sebi aims to enhance the stability and reliability of India's financial markets.

This initiative reflects Sebi's commitment to adapting regulatory frameworks in response to changing market dynamics. The introduction of these advanced stress testing methods underscores the importance of proactive risk management in maintaining market integrity.