SEBI to roll out 20-minute Closing Auction Session from Aug. 3, 2026, replacing 30-minute VWAP close
AI Market Summary
SEBI will shift India's official close from a last-30-minute VWAP to a 20-minute Closing Auction Session starting Aug 3, 2026, for index constituents and related derivatives. A single equilibrium price should strengthen price discovery and reduce end-of-day "marking the close" risks, improving index levels, derivative settlement integrity, and mutual fund NAV accuracy. Trading mechanics change near the close as stop-loss and iceberg orders won't function during the auction.
Impact level
● Medium
Affected assets
NCCOGOLD2USD/USDT-1.71%
AI Insight · NCCOGOLD2USD/USDTAI Insight
● Neutral
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India’s Securities and Exchange Board of India (SEBI) said exchanges will adopt a new Closing Auction Session (CAS) from Aug. 3, 2026, replacing the current 30-minute VWAP-based closing mechanism. The 20-minute CAS will run from 15:15 to 15:35 and is designed to produce a single equilibrium closing price to improve fairness and price discovery. The change is intended to curb “marking the close” and strengthen settlement protection for retail and passive investors. The rule will apply to constituents of domestic equity indices and related derivatives contracts.
