Reggio nell'Emilia:

OBI Group Holding
Octopus Energy Group
Olis We Innovate Cooking
Omnicom Media
Omnissa (Italy) S.r.l.
OneOcean Group
OneStream Software LLC
Oniverse
Onyx Technology S.r.L.
Opdenergy
Open Smart Services
Open-Xchange Inc.
OPPO
Orbyta Group
Orchard Robotics
Orienta SPA
Out in Science, Technology, Engineering, and Mathematics
OutSystems, Inc.
OVS S.p.A.
Oxford Instruments
OXI S.r.L.