Nifty's New Closing Auction Splits Sensex, Nifty Apart

India's two benchmark indices moved in different directions Thursday, with the gap between the Nifty 50 and the Sensex widening for a fourth straight session. The Nifty settled at 24,636, up 11.35 points or 0.05%, while the Sensex closed at 78,954.76, a 0.48% gain. The 43-basis-point spread has persisted since the NSE introduced its Closing Auction Session on August 3.

Market observers said the divergence reflects differences in institutional order flow and auction-window liquidity between the two index baskets, not a fundamental disconnect. The new auction mechanism, which allows a five-minute closing window for order matching, has created a structural quirk that separates the two benchmarks.

Defence stocks surged nearly 3% on the session, adding to the divergence. The broader market was flat, with the headline indices masking the rotation beneath. Most analysts expect the distortion to narrow as participants recalibrate their auction strategies.