OPG orders are qualified as At-the-Open. An OPG qualifier requests that your order will be executed as close to the opening price as possible. The order will be accepted if it is received before 9:15AM (ET). The order can be cancelled after 9:15AM, but it cannot be edited. After 9:28AM, OPG orders cannot be edited or cancelled. Any unfilled orders [..]

Office of the Public Guardian