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Close of Trading with and without Closing Auction

Close of trading is as per the trading periods for the respective trading segments. There are different methods for closing trading.

Close of trading without closing auction

With this method, trading on the Exchange ceases and trading in the respective securities changes to post-trading status. At close of trading, the day's closing price is calculated, and participants are notified of the closing price via the Exchange System. The random time procedure is not used.

Close of trading with closing auction

In certain trading segments, a closing auction is conducted to establish the day's closing prices.

During this phase of trading, participants have a number of possibilities:

  • They may enter or cancel orders and quotes in the order books. Orders are not yet executed.
  • They may report off-order book trades to the Exchange during the closing auction.

Orders and quotes are kept in the order books without being executed. A theoretical opening price, based on the orders in the order books, is calculated using the Matching Rules and displayed via the Exchange System.

End of the closing auction

The closing auction, conducted according to the principle of highest executable volume, is ended by means of the random time procedure (auction and close). Orders and quotes entered during the auction are used to establish the closing prices of the respective securities. Points to note in connection with the end of the auction:

  • Trading hours for securities with a closing auction are not extended.
  • In the case of securities in which no trades were executed during the auction, the last reference price is taken as the day's closing price.

With certain securities, the following case may arise: