Abstract: A method, apparatus and computer-readable medium for performing an opening auction of a derivative, including receiving a first order book and second order book comprising bid orders and ask orders for a first tradable series of a derivative and a second tradable series of said derivative and a third order book comprising bid orders for the first tradable series combined with ask orders for the second tradable series, calculating, for each of the order books, an upper bound for the volume of executable contracts associated with bid orders and an upper bound for the volume of executable contracts associated with ask orders, modifying the order books by cancelling, for each order book, bid orders and asks orders based on the calculated upper bounds, and determining an opening price of each of the first and second tradable series of the derivative using the order books.