Opening Auction
The opening auction allows for the entry, modification and deleting of orders in a given interval (pre-auction), for the purpose of concluding contracts at a single given future moment (the opening), and at a single price (the opening auction price or opening price). The Opening Auction lasts from 07:30 to 09:04 plus a variable interval of up to 30 seconds, determined automatically on a random basis by the trading system. The presence of the Market Maker Scheme (MMS) is mandatory from 9:02. Price variation limits are active based on max static % thresholds. During the opening auction only limit orders are allowed (no market orders are allowed).
If the difference between the indicative uncrossing price and the previous day reference price exceeds the maximum percentage variation (static), the auction extension phase shall be started for 2 minutes plus a variable interval of up to 30 seconds, determined on a random basis by the trading system. Such extension phase could be reproduced several time till the price is not validated (i.e. it is within the maximum percentage variation). Market Supervision can amend the previous day reference price
Further details are included in the following documents: