Exhibit 21

Subsidiaries of Registrant

U.S. Subsidiaries *

Stericycle International, LLC (Delaware)

Stericycle Management, LLC (Delaware)

Stericycle of Washington, Inc. (Washington)

SteriVentures, LLC (Delaware)

Stroud Properties, Inc. (Delaware)

Non-US Subsidiaries*

Shred-it Insurance Limited (Barbados)

Shred-it Belgium (Belgium)

Stericycle, ULC (Canada)

SRCL Cyprus Ltd. (Cyprus)

Shred-it France (France)

Shred-it GmbH (Germany)

SRCL Ireland Limited (Ireland)

SRCL Limited (Ireland)

Shred-it ROI Limited (Ireland)

Stericycle Europe S.a.r.l. (Luxembourg)

Mobile Shredding Luxembourg (Luxembourg)

Stericycle B.V. (Netherlands)

Shred-it Netherlands B.V. (Netherlands)

Stericycle Panama S de RL (Panama)

Ambimed - Gestao Ambiental, Lda. (Portugal)

Azormed-Gestao Ambiental, Lda. (Portugal)

Instituto para a Qualidade em Imagem e Proteccao Radiologica, S.A. (Portugal)

Stericycle of Puerto Rico, Inc. (Puerto Rico)

SRCL Consenur S.L.U. (Spain)

Ecologia y Tecnicas Sanitarias, S.L.U. (Spain)

SRCL Consenur CEE, S.A.U. (Spain)

SRCL Consenur CEE, S.A.U. e Inizia Networks SL UTE (Spain)

Stericycle International Holdings Limited (UK)

Artech Reduction Technologies Limited (UK)

Shred-it Limited (UK)

SRCL Limited (UK)

Stericycle International Holdings Canada Limited (UK)

Stericycle International Limited (UK)

* States or jurisdictions of incorporation or formation are given in parentheses