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IMG INVESTIGATION · India Markets

India’s final price is now an auction

How the Closing Auction Session was designed to strengthen price discovery, why its cash-to-derivatives linkage unsettled F&O traders, and what the first manipulation case revealed about the safeguards still needed.

IMG ORIGINAL INVESTIGATION06 SEP 2026 · 11:00 IST24 MIN READPUBLIC PREVIEW

CENTRAL FINDING

India’s final price is now an auction

CAS is not a failed idea. Concentrating genuine closing interest in a transparent auction can produce a more investible benchmark price and materially reduce tracking error for index funds. India’s first month showed, however, that an auction price is only as robust as its depth, settlement design, cancellation controls and cross-market surveillance. The policy task is to preserve the auction while making a thin or strategically distorted indicative close much harder to transmit into derivatives settlement.

How the Closing Auction Session was designed to strengthen price discovery, why its cash-to-derivatives linkage unsettled F&O traders, and what the first manipulation case revealed about the safeguards still needed.

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