Exhibit 21

List of Subsidiaries, as of December 7, 2012

Key Technology, Inc., an Oregon corporation (the Registrant)

· Key Technology Holdings USA LLC (Oregon)

· Suplusco Holding B.V. (Netherlands)

· Key Technology B.V. (Netherlands)

· Key Technology Australia Pty Ltd. (Australia)

· Productos Key Mexicana S. de R.L. de C.V. (Mexico)

· Key Technology (Shanghai) Trading Co. Ltd. (China)

· Key Technology Asia-Pacific Pte. Ltd. (Singapore)