EXHIBIT 21 SUBSIDIARIES OF BENCHMARK ELECTRONICS, INC. BEI Electronics Ireland Ltd., a Republic of Ireland private limited company Benchmark Electronics FSC, Inc., a Barbados corporation Benchmark Electronics Huntsville Inc., an Alabama corporation AVEX Holdings, Inc., a Delaware corporation Benchmark Electronics AB, a Swedish corporation Benchmark Electronics Pte Ltd., a Singapore corporation AVEX Constitution, Inc., a Delaware corporation AVEX Liberty, Inc., a Delaware corporation Benchmark Electronics de Mexico, S. de R.L. de C.V., a Mexican corporation Benchmark Electronics Servicios, S. de R.L. de C.V., a Mexican corporation AVEX International Corporation, an Alabama corporation Benchmark Electronics Ltda, a Brazilian corporation Benchmark BV Holdings, Inc., a Delaware corporation Tedok B.V., a Netherlands corporation Kilbride Holdings B.V., a Netherlands corporation Benchmark Electronics UK Ltd, a Scottish corporation Burle Caribe Holdings Limited, an Ireland corporation Burle Cayman Holdings Limited, an Ireland corporation Benchmark Electronics Cork, an Ireland corporation Benchmark Elektronikai Termekeket Gyarto Fekekisegu Tarsasag (Benchmark Elektronikai Kft.), a Hungarian corporation All subsidiaries are wholly owned, directly or indirectly, by Benchmark Electronics, Inc.