| 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 | Alumnus | ESA BIC Madrid Region | |
| 1000046511 | JenAscent GmbH | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000048758 | Journey Protector (UK) Limited | GB-United Kingdom | Company | No | Alumnus | ESA BIC UK | |
| 1000030393 | Joysys GmbH | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000042854 | Jsio | PT-Portugal | Company | Yes | Alumnus | ESA BIC Portugal | |
| 1000036431 | JupiterDynamic Atividades de Engenharia e Tecnicas Afins LDA | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000050113 | K2 Photonics AG | CH-Switzerland | Company | Yes | Incubatee | ESA BIC Switzerland | |
| 1000046155 | Kacadu Corp s.r.o. | CZ-Czech Republic | Company | Yes | Incubatee | ESA BIC Czech Republic | |
| 1000047399 | KAMAHU | FR-France | Company | Yes | Alumnus | ESA BIC Nord France | |
| 1000023616 | KAPPAZETA LTD | EE-Estonia | Company | Yes | Alumnus | ESA BIC Estonia | |
| 1000049439 | KAR Architects LTD | GB-United Kingdom | Company | Yes | Incubatee | ESA BIC UK | |
| 1000047632 | KARL Irrigation AB | SE-Sweden | Company | Yes | Alumnus | ESA BIC Sweden | |
| 1000040488 | KARL.farm ApS | DK-Denmark | Company | Yes | Alumnus | ESA BIC Denmark | |
| 1000040366 | KATKORIA DEEPAK - LOGICDEV | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000035600 | KERMAP | FR-France | Company | Yes | Alumnus | ESA BIC Nord France | |
| 1000039573 | Kido Dynamics SA | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000046932 | KineMo Limited | IE-Ireland | Company | Yes | Incubatee | ESA BIC Ireland | |
| 1000040547 | KINETIK Space | DE-Germany | Company | Yes | Alumnus | ESA BIC Bavaria | |