- Oriflame Cosmetics
- Ormco
- Ornua
- ORSAY GmbH
- ORTEC
- osapiens Services GmbH
- Oskar lernt Englisch
- Osram
- Otis
- Otto
- Otto Bock
- Otto Group
- Outfittery GmbH
- Outokumpu
- OVALmedia
- OVH
- Oxera consulting LLP
- Oxford Instruments
- oXxymoron gemeinnützige GmbH
- Ørsted
- P&G
- P3 Group
- Pactera EDGE
- Palantir Technologies
- Palfinger
- Palo Alto Networks
- Panalpina
- PANDORA
- PanzerGlass A/S
- Parexel
- Parexel International
- Parkmobile (PARK NOW)
- Partners Group
- Patreon
- PAYBACK GmbH
- payever
- Payfit
- payleven
- Paymill
- PayPal
- PayPal EMEA
- PEAK Wind ApS
- Peakon
- Pearson
- Penguin Random House
- Penta
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