If you are interested in participating in the opening print of Facebook(FB) first day of trading, the order should be submitted as a Market on Open (MOO). A Limit on Open order (LOO) will be accepted upon submission but, if not executed, a LOO order does not persist, so please monitor such orders closely so that you may resubmit if necessary. Also note that a Limit Order sent prior to the start of trading in FB must be marked outside RTH if the intention is to have the order routed prior to the opening print at the Primary Exchange. Additionally, a Market Order (other than MOO) will not be transmitted until a print is received from the Primary Exchange. // 券商的提示。