Abstract: Systems and methods embodying the present invention permit a trader of securities such as municipal bonds to observe real-time data relating to actual or prospective trades of relevance to a contemplated trade, while excluding those actual or prospective trades that are insufficiently relevant. The trader, or other user, can specify filtering criteria according to which actual or prospective trade data will be collected and presented. The retrieval and presentation of matching data permits an informed yet rapid determination of a price, or other information, for a particular municipal bond or analogous security.