EXHIBIT 21 SUBSIDIARIES OF BENCHMARK ELECTRONICS, INC. SUBSIDIARIES OF BENCHMARK ELECTRONICS, INC., A TEXAS CORPORATION 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 Benchmark Electronics Corp., a Delaware 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 Term_keket Gy_rt_ Fekekis_gu T_rsas_g (Benchmark Elektronikai Kft.), a Hungarian corporation All subsidiaries are wholly owned, directly or indirectly, by Benchmark Electronics, Inc.