Ober Scharrer Gruppe GmbH
Oberbank AG
OBI GmbH & Co. Deutschland KG
Office Events GmbH
OFFICE Personal
OFFINA Personalmanagement GmbH
Olympus Europa
ONLY Stores
Onyx Circle AG
Open Grid Europe
OpenText Software
operational services
OPITZ CONSULTING
OPPM Office Professional
opta data
Optimus Search
Opus One Recruitment GmbH
ORANGE Engineering GmbH & Co. KG
Orizon Hamburg GmbH
Oswald Iden Engineering GmbH & Co. KG
Otti & Partner
Otto Building Technologies GmbH
Otto (GmbH & Co KG)
ORACLE
Opel
OSRAM
OSB
OSCAR