Users are able to create custom lists of stocks in the Lists section of My123 in the navigation at the top of any page. This permits one to create custom universes that might otherwise be difficult to derive in a screner or ranking system.

For example, one could create an "Internet Bellweather" group composed of EBay, Yahoo, Google and Amazon by creating a list called "InternetBells" and listing the ticker symbols EBAY,YHOO,GOOG,AMZN. (The list can be comma, space or carriage return deliniated.)

Once done, InList("InternetBells") would then only look at these stocks, while !InList("InternetBells") (note the exclamation point at the start) would exclude them.