La Spezia:

OBI Group Holding
Octocom
Octopus Energy Group
Olis We Innovate Cooking
omnia retail
Omnicom Media
Omnissa (Italy) S.r.l.
Oncode
OneOcean Group
OneStream Software LLC
Oniverse
only job
Onyx Technology S.r.L.
Opdenergy
Open Smart Services
Open-Xchange Inc.
openjobmetis
OPLIUM
OPPO
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