EX-21 3 p10k21.txt PIONEER EXH 21.1 TO 2001 10-K EXHIBIT 21.1 SUBSIDIARIES OF THE COMPANY State or Jurisdiction of Organization Subsidiaries --------------------- ------------ Delaware Bridge Oil (U.S.A.) Inc. Delaware DMLP Co. Netherlands D, P & D Investments B.V. Delaware Mesa Environmental Ventures Co. Texas Mesa Offshore Royalty Partnership Delaware Parker & Parsley Argentina, Inc. Australia Parker & Parsley Petroleum Australia Holdings Pty Limited Australia Parker & Parsley Petroleum Australia Pty Limited Delaware Pioneer International Resources Company Texas Pioneer Natural Gas Company Cayman Islands Pioneer Natural Resources Anaguid Ltd. Argentina Pioneer Natural Resources (Argentina) S.A. Canada Pioneer Natural Resources Canada Inc. Cayman Islands Pioneer Natural Resources (Cayman) Ltd. Texas Pioneer Natural Resources Scholarship Foundation South Africa Pioneer Natural Resources South Africa (Pty) Limited Argentina Pioneer Natural Resources (Tierra Del Fuego) S.A. Cayman Islands Pioneer Natural Resources Tunisia Ltd. Delaware Pioneer Natural Resources USA, Inc. Bahamas Pioneer Resources Africa, Ltd. Delaware Pioneer Resources Mediterranean, Inc. Bahamas Pioneer Resources Gabon - Olowi Ltd. Texas Pioneer Uravan, Inc. Delaware Westpan NGL Co. Partnerships that Pioneer Natural Resources USA, Inc. ----------------------------------------------------- is the managing general partner Delaware Parker & Parsley 87-A Conv., Ltd. Partnerships that Pioneer Natural Resources USA, Inc. ----------------------------------------------------- is the managing general partner Delaware Parker & Parsley Private Investment 88, L.P. Delaware Parker & Parsley Private Investment 89, L.P. Delaware Parker & Parsley 90 Spraberry Private Development Conv., L.P. Texas Midkiff Development Drilling Program, Ltd. 99