Sassari:

Octocom
Octopus Energy Group
Oliver James Associates Ltd.
omnia retail
Omnissa (Italy) S.r.l.
Oncode
OneOcean Group
OneStream Software LLC
Onyx Technology S.r.L.
Opdenergy
Open Smart Services
Open-Xchange Inc.
openjobmetis
OPLIUM
OralPro
Orbyta Group
Orchard Robotics
Orienta SPA
Out in Science, Technology, Engineering, and Mathematics
OutSystems, Inc.
OVERTECH Consulting
ovs
OVS S.p.A.
Oxford Instruments
Oxigent Technologies