EXHIBIT 21 PARLEX CORPORATION Listing of Subsidiaries Parlex International Corp. Incorporated - St. Thomas, U.S. Virgin Islands Organized as a Foreign Sales Corporation January 8, 1985 Parlex (Shanghai) Circuit Co., Ltd. Incorporated in Shanghai, China Date of Incorporation - May 29, 1995 Parlex Dynaflex Corporation Date of Incorporation in California - April 22, 1999