| 1000044907 | LEAM Technologies GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000041359 | LEAGUES GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Baden-Württemberg | |
| 1000032536 | Latitudo40 S.r.l. | IT-Italy | Company | Yes | Alumnus | ESA BIC Lazio | |
| 1000041078 | LATITUDE | FR-France | Company | Yes | Alumnus | ESA BIC Nord France | |
| 1000043896 | LaterationXYZ GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Baden-Württemberg | |
| 1000032433 | Lanterne LTD | GB-United Kingdom | Company | No | Alumnus | ESA BIC UK | |
| 1000043799 | Lamb Space Tec GmbH | DE-Germany | Company | No | Incubatee | ESA BIC North Rhine-Westphalia | |
| 1000032337 | La TeleScop | FR-France | Company | No | Alumnus | ESA BIC Sud France | |
| 1000025162 | Kuva Space Oy | FI-Finland | Company | Yes | Alumnus | ESA BIC Finland | |
| 1000033566 | KUUB3 | BE-Belgium | Company | No | Alumnus | ESA BIC Belgium | |
| 1000039773 | KURS ORBITAL S.R.L. | IT-Italy | Company | No | Alumnus | ESA BIC Turin | |
| 1000040242 | Kreios Space S.L. | ES-Spain | Company | Yes | Alumnus | ESA BIC Barcelona | |
| 1000037331 | KrattWorks Ltd | EE-Estonia | Company | No | Alumnus | ESA BIC Estonia | |
| 1000046391 | KOTA Sp. z.o.o | PL-Poland | Company | No | Incubatee | ESA BIC Poland | |
| 1000043305 | Kosmok PSA | PL-Poland | Company | Yes | Incubatee | ESA BIC Poland | |
| 1000044162 | KoraLabs GmbH | CH-Switzerland | Company | No | Incubatee | ESA BIC Switzerland | |
| 1000046732 | KOKO Forest Oy | FI-Finland | Company | No | Incubatee | ESA BIC Finland | |
| 1000043707 | koeniXadler GmbH | AT-Austria | Company | Yes | Alumnus | ESA BIC Austria | |
| 1000032353 | Klepsydra Technologies | CH-Switzerland | Company | Yes | Alumnus | ESA BIC Switzerland | |
| 1000042844 | Klarifi ApS | DK-Denmark | Company | Yes | Alumnus | ESA BIC Denmark | |