ITEM 14(A)3, EXHIBIT 22 SUBSIDIARIES OF THE REGISTRANT PERCENT OF VOTING SECURITIES INCORPORATED OWNED NAME OF COMPANY UNDER LAWS OF BY TESORO Tesoro Alaska Petroleum Company------ Delaware 100% Tesoro Alaska Pipeline Company------- Delaware 100% Tesoro Bolivia Petroleum Company----- Texas 100% Tesoro Exploration and Production Company---------------------------- Delaware 100% Tesoro Northstore Company------------ Alaska 100% Tesoro Petroleum Companies, Inc.----- Delaware 100% Tesoro Petroleum Distributing Company---------------------------- Louisiana 100% Tesoro Refining, Marketing & Supply Company---------------------------- Delaware 100% Small or inactive subsidiaries are omitted from the above list. Such omitted subsidiaries, considered in the aggregate as a single subsidiary, would not constitute a 'significant subsidiary' as of the end of the year covered by this annual report. 81