NSE Derivatives Turnover Hits 17-Month Low As RBI Bank Guarantee Rules Curb Leverage

Derivatives trading on India's largest stock exchange hit a wall in July. The culprit was a Reserve Bank of India (RBI) rule that reshaped how proprietary trading firms fund their positions.

Average daily notional turnover for futures and options on the National Stock Exchange (NSE) fell 23% in July to ₹214 trillion, the lowest since February 2025. The Bombay Stock Exchange (BSE) moved in the opposite direction, with the same metric rising 8.4% to ₹232 trillion during the same period.

The Numbers (July vs June)

• NSE average daily notional turnover: ₹214 trillion, down 23% from June.

• BSE average daily notional turnover: ₹232 trillion, up 8.4% from June.

• NSE average daily premium turnover: ₹502 billion, down 18% from June.

• BSE average daily premium turnover: ₹254 billion, down 3.1% from June.

What Changed

In June, the RBI introduced a requirement that bank guarantees used by trading firms must be fully backed by collateral, with a minimum of half in cash. The practical effect was a squeeze on leverage.

Proprietary trading firms that had been using bank guarantees as a cost-efficient way to back their derivatives positions suddenly faced higher funding costs and a reduced capacity to take large bets.

Two things compounded the impact. First, lower market volatility reduced the urgency to hedge. The India NSE Volatility Index fell for a fourth straight month as the Nifty 50 climbed higher. Second, geopolitical uncertainty kept some participants on the sidelines.

The Bigger Picture

The July decline is not happening in isolation. SEBI has spent the past two years tightening the derivatives framework, raising contract sizes, clamping down on position limits and adding safeguards to reduce retail speculation in options. The RBI's bank guarantee rule is the latest addition to that tightening cycle.

NSE remains the world's largest derivatives exchange by contract count and reported a profit increase last week. Its initial public offering is also expected to be among India's largest when it arrives.

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