CAS No-Trade Day: Why F&O Expiry Strategies May Need a Rethink
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India's new Closing Auction System (CAS), launched on August 3, triggered an August 12 no-trade day and a sharp pullback in derivatives activity with options volumes down 46% and notional turnover down 27% in the first six CAS sessions versus July. Final 15-minute NSE turnover collapsed to 1.6%–2.3% from a historical 10.1%, forcing F&O expiry strategies and risk management around the 3:15 p.m. close to be rethought and raising liquidity and execution concerns for derivatives traders, CEX/DEX participants and crypto/DeFi market observers.
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- CAS may force F&O expiry strategies to rethink risk management around the 3:15 p.m. close.
- Options volumes fell 46% in the first six CAS sessions compared with July levels.
- Final 15-minute NSE turnover fell to 1.6%-2.3%, versus a historical level of 10.1%.
India’s new Closing Auction System (CAS) is changing how derivatives traders approach the final minutes of the session, especially on expiry days. The pressure became visible after CAS began on August 3, when retail traders raised concerns about volatility, weaker liquidity, and uncertain settlement prices.
Those concerns culminated in an August 12 “no-trade day” across the Indian stock market. Moneycontrol reported that options volumes fell 46% during the first six CAS sessions compared with July, while notional turnover declined 27%.
However, the bigger issue for F&O trading is not lower activity alone…
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