A pedestrian walks by an Apple Store following an announcement that Apple has become the world's most valuable brand on May 9, 2011 in San Francisco, California. - 

Silicon Valley companies sure know how to use silicon for profit. They are also very accomplished at reducing their tax bills. An investigative reporter in Northern California did some digging and calculated how much some big technology companies have saved in U.S. taxes by stashing a chunk of their profits overseas.

Matt Drange with the Center for Investigative Reporting joined Marketplace Tech host David Brancaccio to discuss which companies -- Apple, Google, and Cisco to name a few -- may be taking advantage of these tax structures.

Follow David Brancaccio at @DavidBrancaccio