| 1000043740 | Novac srl | IT-Italy | Company | Yes | Alumnus | ESA BIC Turin | |
| 1000045022 | NovoViz SA | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000046265 | Noxon GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000036936 | Ntention AS | NO-Norway | Company | Yes | Alumnus | ESA BIC Norway | |
| 1000039138 | OBLIQUE MANEUVER - UNIPESSOAL LDA - ViBo Health | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000049811 | Oblivious Software Limited | IE-Ireland | Company | No | Alumnus | ESA BIC Ireland | |
| 1000031856 | Obuu Tech SL | ES-Spain | Company | Yes | Alumnus | ESA BIC Madrid Region | |
| 1000040019 | OCCAM SPACE, S.L. | ES-Spain | Company | Yes | Alumnus | ESA BIC Madrid Region | |
| 1000046946 | Ocean Access AS | NO-Norway | Company | Yes | Alumnus | ESA BIC Norway | |
| 1000046445 | Ocean Ledger | GB-United Kingdom | Company | Yes | Alumnus | ESA BIC UK | |
| 1000051732 | Odes Space P.C. | GR-Greece | Company | No | Incubatee | ESA BIC Greece | |
| 1000041659 | ODIN Space Ltd | GB-United Kingdom | Company | Yes | Alumnus | ESA BIC UK | |
| 1000040618 | Odonata GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000043081 | Officina REV srl | IT-Italy | Company | No | Alumnus | ESA BIC Turin | |
| 1000046769 | Oinride Oy | FI-Finland | Company | No | Alumnus | ESA BIC Finland | |
| 1000031421 | OKAPI:Orbits GmbH | DE-Germany | Company | Yes | Alumnus | ESA BIC Hessen | |
| 1000042494 | Okeanos Smart Data Solutions GmbH | DE-Germany | Company | No | Alumnus | ESA BIC North Rhine-Westphalia | |
| 1000042424 | Olive Robotics GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000049268 | Olorin Srl | IT-Italy | Company | Yes | Incubatee | ESA BIC Turin | |
| 1000030044 | OMANOS ANALYTICS | GB-United Kingdom | Company | Yes | Alumnus | ESA BIC UK | |