Bedrift O - Nesbru
- Odina AS
- Oppkomme AS
- Octano AS
- Oliver AS
- Owe AS
- Open AS
- Olisatek AS
- Okie AS
- Odalen AS
- Onarts AS
- Onarts AS
- Omn AS
- Ozon Gruppen AS
- Olivia Stone
- Odga Holding AS
- Oslo Bridgeklubb
- Oli Holding AS
- Ola Grønseth
- Ozon Kube AS
- Optimal Totalentreprenør AS
- Oddsten Consulting AS
- Oslo Bridgeklubb
- Oskars Forstmanis
- Ousama Mahmoud
- Ozon Transport AS
- Oxs Holding AS
- OK Minilager Billingstad
- Ola Nordvang Rundfloen
- Our Democracy 2 AS
- Oliver og Farfar AS
- Olav K Brekke AS
- Olsen Yngve Holte
- Oslo Asset Management Holding AS
- O Thrane Eiendom Næring AS
- Olav Christian Nordtorp Houge
- Oslo & Akershus Byggentreprenør AS Konkursbo
- Oslo og Akershus Byggkompetanse AS Konkursbo
- Oslo og Akershus Byggkompetanse AS Konkursbo
- Oslo & Akershus Byggentreprenør AS Konkursbo
- Oslo Lokallag Av Landslaget for Offentlige Pensjonister