Trieste:

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