The monthly data on holdings of long-term securities, as well as the monthly table on Major Foreign Holders of Treasury Securities, reflect foreign holdings of U.S. securities collected primarily on the basis of custodial data. These data help provide a window into foreign ownership of U.S. securities, but they cannot attribute holdings of U.S. securities with complete accuracy. For example, if a U.S. Treasury security purchased by a foreign resident is held in a custodial account in a third country, the true ownership of the security will not be reflected in the data. The custodial data will also not properly attribute U.S. Treasury securities managed by foreign private portfolio managers who invest on behalf of residents of other countries. In addition, foreign countries may hold dollars and other U.S. assets that are not captured in the TIC data. For these reasons, it is difficult to draw precise conclusions from TIC data about changes in the foreign holdings of U.S. financial assets by individual countries.