Attached files

file filename
EX-10.12.5 - EX-10.12.5 - INSMED Inca2227323zex-10_125.htm
EX-10.14.1 - EX-10.14.1 - INSMED Inca2227323zex-10_141.htm
EX-10.17.2 - EX-10.17.2 - INSMED Inca2227323zex-10_172.htm
EX-23.1 - EX-23.1 - INSMED Inca2227323zex-23_1.htm
EX-31.1 - EX-31.1 - INSMED Inca2227323zex-31_1.htm
EX-10.12.2 - EX-10.12.2 - INSMED Inca2227323zex-10_122.htm
EX-10.14.2 - EX-10.14.2 - INSMED Inca2227323zex-10_142.htm
EX-10.12.4 - EX-10.12.4 - INSMED Inca2227323zex-10_124.htm
EX-10.17.1 - EX-10.17.1 - INSMED Inca2227323zex-10_171.htm
EX-31.2 - EX-31.2 - INSMED Inca2227323zex-31_2.htm
EX-32.1 - EX-32.1 - INSMED Inca2227323zex-32_1.htm
EX-32.2 - EX-32.2 - INSMED Inca2227323zex-32_2.htm
10-K - 10-K - INSMED Inca2227323z10-k.htm
EX-10.12.1 - EX-10.12.1 - INSMED Inca2227323zex-10_121.htm

QuickLinks -- Click here to rapidly navigate through this document


EXHIBIT 21.1

APPENDIX A
LIST OF SUBSIDIARIES

Name
  Jurisdiction of Incorporation
Insmed Pharmaceuticals, Inc.    Virginia
Celtrix Pharmaceuticals, Inc.   Delaware
Insmed Limited   England and Wales
Transave, LLC   Delaware
Insmed Holdings Limited   Ireland
Insmed Ireland Limited   Ireland
Insmed Germany GmbH   Germany
Insmed France SAS   France
Insmed Netherlands B.V.   Netherlands



QuickLinks

APPENDIX A LIST OF SUBSIDIARIES