| 1000041801 | IRUBIS GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000030449 | Isar Aerospace SE | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000044629 | IVAQ Technologies S.L. | ES-Spain | Company | No | Incubatee | ESA BIC Madrid Region | |
| 1000046511 | JenAscent GmbH | AT-Austria | Company | No | Incubatee | ESA BIC Austria | |
| 1000030393 | Joysys GmbH | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000042854 | Jsio | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000036431 | JupiterDynamic Atividades de Engenharia e Tecnicas Afins LDA | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000040366 | KATKORIA DEEPAK - LOGICDEV | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000039573 | Kido Dynamics SA | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000032428 | Kinetikos | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000030954 | Kinfinity UG (haftungsbeschränkt) | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000046732 | KOKO Forest Oy | FI-Finland | Company | No | Incubatee | ESA BIC Finland | |
| 1000044162 | KoraLabs GmbH | CH-Switzerland | Company | No | Incubatee | ESA BIC Switzerland | |
| 1000046391 | KOTA Sp. z.o.o | PL-Poland | Company | No | Incubatee | ESA BIC Poland | |
| 1000037331 | KrattWorks Ltd | EE-Estonia | Company | No | Alumnus | ESA BIC Estonia | |
| 1000039773 | KURS ORBITAL S.R.L. | IT-Italy | Company | No | Alumnus | ESA BIC Turin | |
| 1000033566 | KUUB3 | BE-Belgium | Company | No | Alumnus | ESA BIC Belgium | |
| 1000032337 | La TeleScop | FR-France | Company | No | Alumnus | ESA BIC Sud France | |
| 1000043799 | Lamb Space Tec GmbH | DE-Germany | Company | No | Incubatee | ESA BIC North Rhine-Westphalia | |
| 1000032433 | Lanterne LTD | GB-United Kingdom | Company | No | Alumnus | ESA BIC UK | |