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New Auction System Sparks Market Chaos
4 Aug
Summary
- New auction system debut caused unprecedented divergence in indices.
- Closing prices now determined by a separate auction process.
- Tuesday's derivatives expiry will critically test the new system.
Market participants encountered widespread confusion on Monday during the inaugural session of the exchanges' new auction system. This led to unprecedented divergence between index and stock values across bourses, startling traders.
The Nifty closed at 24,774.30, up 1.60%, and the Sensex at 78,639.03, up 0.70%, with unusual percentage differences between them.
The updated closing auction system now determines official closing prices for the futures and options segment through a distinct auction, replacing the prior volume-weighted average price (VWAP) method used in the last 30 minutes of trading. This change aims to enhance the robustness of closing prices against large last-minute orders.
Analysts suggest that while the intention behind the closing auction is positive, its initial implementation faced challenges. The new system's first major test is expected on Tuesday with the expiry of NSE's weekly derivatives contracts, as traders will closely observe its impact on settlement prices.
Concerns were raised that large institutional buy orders in Nifty heavyweights during the closing auction may have disproportionately inflated their closing prices. Unlike the previous system where such orders were spread over the last 30 minutes, the new framework concentrates their impact within the auction period.
