5/28/91 - can OAX and OLX options be used to reduce margin requirements on short OEX options? yes, according to Diane Malley at CBOE - can I place an OAX/OEX spread order? Ben Stevens is checking it out. 6/18/91 Jerry Kopf: After hours trading: - are you staying late to cover these hours? no. - are market makers/specialists involved or just public? orders must be matched. buys are at ask and sales at bid.