Exhibit 21
BIOGEN IDEC INC
The following is a list of subsidiaries of Biogen Idec Inc. as of December 31, 2012, omitting some subsidiaries which, considered in the aggregate, would not constitute a significant subsidiary.
SUBSIDIARY | STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION |
Biogen Idec MA Inc. | Massachusetts |
Biogen Idec New Ventures, Inc. | Delaware |
Biogen Idec Manufacturing Holding LLC | Delaware |
Biogen Idec Holding I Inc. | Delaware |
Biogen Idec Holding II Inc. | Delaware |
Biogen Idec Realty Corporation | Massachusetts |
Biogen Idec Realty Limited Partnership | Massachusetts |
Biogen Idec U.S. Corporation | Massachusetts |
Biogen Idec U.S. Limited Partnership | Massachusetts |
Biogen Idec (RTP) Realty LLC | Delaware |
The Biogen Idec Foundation Inc. | Massachusetts |
Biogen Idec U.S. Pacific LLC | Delaware |
Biogen Idec U.S. West Corporation | Delaware |
Biogen Idec Therapeutics Inc. | Delaware |
Biogen Idec Nobel Research Center, LLC | Delaware |
Conforma Therapeutics Corporation | Delaware |
Stromedix, Inc. | Delaware |
Biogen Idec Hemophilia Inc. | Delaware |
Biogen Idec Canada Inc. | Delaware |
Biogen Idec SRO, Inc. | Delaware |
Biogen Idec (Argentina) SRL | Argentina |
Biogen Idec Australia PTY Ltd | Australia |
Biogen Idec Austria GmbH | Austria |
Biogen Idec Belgium N.V./S.A. | Belgium |
Biogen Idec Brazil Produtos Farmaceuticos LTDA | Brazil |
Biogen Idec (Czech Republic) s.r.o. | Czech Republic |
Biogen Idec (Denmark) A/S | Denmark |
Biogen Idec (Denmark) Manufacturing ApS | Denmark |
Biogen Idec Holding APS | Denmark |
Biogen Idec Finland OY | Finland |
Biogen Idec France S.A.S. | France |
Biogen Idec GmbH | Germany |
Biogen Idec Biotech India Pvt. Ltd. | India |
Biogen Idec (Ireland) Ltd. | Ireland |
Biogen Idec Japan Ltd. | Japan |
Biogen Idec Mexico S. DE R.L. DE C.V. | Mexico |
Biogen Idec B.V. | The Netherlands |
Biogen Idec International B.V. | The Netherlands |
Biogen Idec Norway AS | Norway |
Biogen Idec NZ Ltd. | New Zealand |
Biogen Idec Portugal Sociedade Farmaceutica, Unipessoal, Lda. | Portugal |
Biogen Idec Iberia, S.L. | Spain |
Biogen Idec (Slovak Republic) s.r.o. | Slovak Republic |
Biogen Idec promet s farmacevtskimi in biotehnoloskimi proizvodi d.o.o | Slovenia |
Biogen Idec Sweden AB | Sweden |
Biogen Idec International GmbH | Switzerland |
Eidetica Biopharma GmbH | Switzerland |
Biogen Idec Ltd. | UK |
Biogen Idec Switzerland AG | Switzerland |
Biogen Idec Italia SRL | Italy |
Biogen Idec Luxembourg Holding SARL | Luxembourg |
Biogen Idec International Holding Limited | Bermuda |
Arrowpark Interseas Ltd. | Isle of Man |
Wolter Interseas Ltd. | Isle of Man |
Biogen Idec Management Services GmbH | Switzerland |
Biogen Idec (Denmark) New Manufacturing ApS | Denmark |
Fundacion Biogen Idec | Spain |
Biogen Idec (Hong Kong) Limited | Hong Kong |
Biogen Idec (Singapore) Pte Ltd | Singapore |
Biogen Idec Hungary KFT | Hungary |
Biogen Idec Uruguay SA | Uruguay |
Biogen Idec Chile Spa | Chile |
Biogen Idec International Neuroscience GmbH | Switzerland |
Biogen Idec Poland | Poland |
Biogen Idec Pharmaceutical Consultancy (Shanghai) Co., Ltd. | China |
Biogen Idec Research Ltd. | UK |