Arezzo:

OBI Group Holding
Octocom
Octopus Energy Group
off team
Olis We Innovate Cooking
omnia retail
Omnicom Media
Omnissa (Italy) S.r.l.
Oncode
OneOcean Group
OneStream Software LLC
Oniverse
Onyx Technology S.r.L.
Opdenergy
Open Smart Services
Open-Xchange Inc.
openjobmetis
Openjobmetis SpA
OPLIUM
OPPO
OralPro
Orbyta Group
Orchard Robotics
orienta
orienta filiale di montevarchi
Orienta SPA
Out in Science, Technology, Engineering, and Mathematics
OutSystems, Inc.
OVERTECH Consulting
OVS S.p.A.
Oxford Instruments
Oxigent Technologies