Closing Auction Raises Delivery Risk for Stock Option Traders

The Story in Brief

The new closing auction window could leave stock option traders with unexpected delivery obligations when monthly contracts expire, Livemint reports. The official settlement price is determined after order matching ends, so an option can shift from out of the money to in the money during the final auction. NSE and BSE monthly expiries on 25 and 27 August will be the first key tests.

Continuous trading ends at 3:15 pm, followed by order matching between 3:20 pm and 3:30 pm. Traders can use the 3:30 pm to 3:40 pm post-close window to square off. Those unable to deliver shares may face auction premiums of around 1% to 2%, plus a 1% facilitation fee. Index derivatives are cash-settled and are not affected.

The Indian Opinion

Claims that the new system makes every expiry dangerous overstate the risk. The exposure is concentrated among short sellers, traders with multiple positions and those without the underlying shares. The 10-minute post-close window offers a practical escape from delivery, though not from losses. The first August expiries should show whether auction premiums stay near the reported 1% to 2% range, especially in illiquid stocks.

Source: livemint.com

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