Many U.S. corp. operate globally and have foreign subsidiaries. The subsidiaries may be created, for ex., to take advantage of sales opportunities or favorable labor conditions. In some cases they may be used to reduce taxes. This report determined how many of the 100 largest publicly traded U.S. corp. and the 100 largest publicly traded U.S. fed. contractors have subsidiaries in jurisdictions listed as tax havens or financial privacy jurisdictions. The author: (1) combined three lists of such jurisdictions created by governmental, international, and academic sources; and (2) identified large publicly traded U.S. corp. and fed, contractors and the locations of their subsidiaries using the Fortune 500 list, a fed. contracting Web site, and a SEC database. Charts and tables.