Exhibit 21
BIOGEN INC.
The following is a list of subsidiaries of Biogen Inc. as of December 31, 2023, omitting some subsidiaries which, considered in the aggregate, would not constitute a significant subsidiary.
SUBSIDIARY | STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION | |||||||
Biogen Foundation Inc. | Massachusetts | |||||||
Biogen MA Inc. | Massachusetts | |||||||
Biogen Realty Corporation | Massachusetts | |||||||
Biogen Realty Limited Partnership | Massachusetts | |||||||
Biogen U.S. Corporation | Massachusetts | |||||||
Biogen U.S. Limited Partnership | Massachusetts | |||||||
Biogen (RTP) Realty LLC | Delaware | |||||||
Biogen Chesapeake LLC | Delaware | |||||||
Biogen Digital Health Inc. | Delaware | |||||||
Biogen Digital Health Global LLC | Delaware | |||||||
Biogen Holding I LLC | Delaware | |||||||
Biogen Holding II LLC | Delaware | |||||||
Biogen OUS Holding Inc. | Delaware | |||||||
Biogen Manufacturing Holding LLC | Delaware | |||||||
Biogen New Ventures Inc. | Delaware | |||||||
Biogen SRO Inc. | Delaware | |||||||
Biogen Therapeutics Inc. | Delaware | |||||||
Biogen U.S. Pacific LLC | Delaware | |||||||
Biogen U.S. West Corporation | Delaware | |||||||
Conforma Therapeutics Corporation | Delaware | |||||||
Stromedix, Inc. | Delaware | |||||||
Nightstar, Inc. | Delaware | |||||||
Reata Pharmaceuticals Global, Inc. | Delaware | |||||||
Reata Pharmaceuticals Holdings, LLC. | Delaware | |||||||
Reata Pharmaceuticals, Inc. | Delaware | |||||||
Biogen (Argentina) SRL | Argentina | |||||||
Biogen Australia PTY Ltd | Australia | |||||||
Reata Australia PTY Ltd | Australia | |||||||
Biogen Austria GmbH | Austria | |||||||
Biogen Belgium N.V./S.A. | Belgium | |||||||
Biogen International Holding Limited | Bermuda | |||||||
Biogen (Bermuda) Technologies Ltd. | Bermuda | |||||||
Biogen Brasil Produtos Farmaceuticos LTDA | Brazil | |||||||
Biogen Canada Inc. | Canada | |||||||
Biogen Chile SpA | Chile | |||||||
Biogen Biotechnology (Shanghai) Co., Ltd | China | |||||||
BIIB Colombia S.A.S. | Colombia | |||||||
Biogen Pharma d.o.o. | Croatia | |||||||
Biogen (Czech Republic) s.r.o. | Czech Republic | |||||||
Biogen (Denmark) A/S | Denmark |
SUBSIDIARY | STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION | |||||||
Biogen Estonia OU | Estonia | |||||||
Biogen Finland OY | Finland | |||||||
Biogen France S.A.S. | France | |||||||
Reata France S.A.S. | France | |||||||
Biogen GmbH | Germany | |||||||
Reata Germany GmbH | Germany | |||||||
Biogen Hong Kong Limited | Hong Kong | |||||||
Biogen Hungary KFT | Hungary | |||||||
Biogen Idec Biotech India Pvt. Ltd. | India | |||||||
Biogen Capability Center India Private Limited | India | |||||||
Biogen Idec (Ireland) Ltd. | Ireland | |||||||
Nightstar Europa Limited | Ireland | |||||||
Reata Ireland Limited | Ireland | |||||||
Biogen Italia S.R.L. | Italy | |||||||
Reata Italy S.R.L. | Italy | |||||||
Biogen Japan Ltd. | Japan | |||||||
Biogen Korea LLC | Korea | |||||||
Biogen Latvia SIA | Latvia | |||||||
Biogen Lithuania UAB | Lithuania | |||||||
Biogen Luxembourg Holding S.a.r.l. | Luxembourg | |||||||
Biogen Mexico S. de R.L. de C.V. | Mexico | |||||||
Biogen NZ Biopharma Ltd. | New Zealand | |||||||
Biogen Norway AS | Norway | |||||||
Biogen Poland Sp. z.o.o. | Poland | |||||||
Biogen Portugal Sociedade Farmaceutica, Unipessoal Lda. | Portugal | |||||||
Biogen Regional Headquarters LLC | Saudi Arabia | |||||||
Biogen Slovakia s.r.o. | Slovak Republic | |||||||
Biogen Pharma, farmacevtska in biotehnoloska druzba, d.o.o. | Slovenia | |||||||
Biogen Spain, S.L. | Spain | |||||||
Biogen Sweden AB | Sweden | |||||||
Biogen Digital Health International GmbH | Switzerland | |||||||
Biogen International GmbH | Switzerland | |||||||
Biogen International Neuroscience GmbH | Switzerland | |||||||
Biogen Management Services GmbH | Switzerland | |||||||
Biogen Swiss Manufacturing GmbH | Switzerland | |||||||
Biogen Switzerland AG | Switzerland | |||||||
Eidetica Biopharma GmbH | Switzerland | |||||||
Reata Swiss International GmbH | Switzerland | |||||||
Biogen Taiwan Limited | Taiwan | |||||||
Biogen Turkey Ilac Ticaret Limited Sirketi | Turkey | |||||||
Biogen B.V. | The Netherlands | |||||||
Biogen Netherlands B.V. | The Netherlands | |||||||
Biogen Idec Limited | United Kingdom | |||||||
Biogen Idec Research Ltd. | United Kingdom | |||||||
Convergence Pharmaceuticals Limited | United Kingdom | |||||||
Convergence Pharmaceuticals Holdings Ltd. | United Kingdom | |||||||
Old Convergence Pharmaceuticals Limited | United Kingdom | |||||||
Reata U.K. Limited | United Kingdom |
SUBSIDIARY | STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION | |||||||
Silver Acquisition Co. Ltd. | United Kingdom | |||||||
Nightstar Therapeutics Limited | United Kingdom | |||||||
NightstaRx Limited | United Kingdom | |||||||
Tungsten Bidco Limited | United Kingdom | |||||||
Biogen Idec Uruguay SA | Uruguay |