On the Record · Ionis Pharmaceuticals
Ionis Pharmaceuticals subsidiaries, as it lists them
The subsidiaries Ionis Pharmaceuticals lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| Akcea Therapeutics, Inc. | a Delaware Corporation |
| Akcea Therapeutics Germany GmbH | a German Corporation |
| Akcea Therapeutics UK Limited | a United Kingdom Limited Private Company |
| Akcea Therapeutics Ireland Limited | an Irish Private Company |
| Akcea Therapeutics Italia S.r.l. | an Italian Company |
| Akcea Therapeutics Portugal, Unipessoal Lda | a Portuguese Company |
| Ionis Faraday LLC | a Delaware Corporation |
| Ionis Gazelle LLC | a Delaware Corporation |
| Ionis Ireland Limited | an Irish Private Company |
| Ionis USA Limited | a United Kingdom Limited Private Company |
| Ionis Development (Ireland) Limited | an Irish Private Company |
| Osprey Therapeutics, Inc. | a Delaware Corporation |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Ionis Pharmaceuticals’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-26. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.