| Summary of collaboration revenues by destination |
| | | | | | | | | | | | Year ended December 31, | | | 2025 | | 2024 | | 2023 | | | | (Euro, in thousands) | United States of America | | € | 1,081,144 | | € | 266,588 | | € | 665,174 | Europe | | | 31,104 | | | 46,577 | | | 118,354 | Total net revenues | | € | 1,112,248 | | € | 313,165 | | € | 783,528 | | | | | | | | | | | minus: | | | | | | | | | | United States of America | | € | — | | € | 25,802 | | € | 425,466 | Europe | | | — | | | 11,714 | | | 118,338 | Total net revenues from discontinued operations | | € | — | | € | 37,516 | | € | 543,804 | | | | | | | | | | | United States of America | | € | 1,081,144 | | € | 240,786 | | € | 239,708 | Europe | | | 31,104 | | | 34,863 | | | 16 | Total net revenues from continuing operations | | € | 1,112,248 | | € | 275,649 | | € | 239,724 |
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| Schedule of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts by location |
| | | | | | | | | | | | December 31, | | | 2025 | | 2024 | | 2023 | | | | | (Euro, in thousands) | Belgium | | € | 3,887 | | € | 95,686 | | € | 56,209 | France | | | — | | | 5 | | | 1,438 | The Netherlands | | | 75,890 | | | 239,454 | | | 251,230 | Switzerland | | | — | | | 92 | | | 3,247 | United States of America | | | 1,734 | | | 22,533 | | | 11,660 | Total non-current assets | | € | 81,511 | | € | 357,770 | | € | 323,784 |
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