Bedrift O - Mandal
- Ossia AS
- Orissa AS
- Opk AS
- Ovata AS
- Otterdal Yoga
- Oei Holding AS
- Oluf Lohne
- Odd Stray
- Of Capital AS
- Ove Aanestad
- Oftenes Eiendom AS
- Oeg Holding AS
- Oriental Market AS
- Olivias Hus
- Osk Invest AS
- Orelunden dagsenter
- Ocean II AS
- Odd Hallingsgård
- Oppe Veveri
- Omland Invest AS
- Ocean Equity AS
- Oceangate Norway AS
- Omlandsneset Vel
- Omå AS Konkursbo
- Olsen Knut
- Olsen Magnus
- Omland Bygdelag
- Omland Bygdelag
- Olsen Roald
- Oas Vaktmesterservice AS
- Olka Invest AS
- Oddvar Løge
- Omre Næringspark AS
- Oskar Kaaløy AS
- O. Edland AS
- Oakland Home AS
- Omk AS Konkursbo
- Omk AS Konkursbo
- Omb AS Konkursbo
- Omå AS Konkursbo
- Omb AS Konkursbo
- Omexom Mandal
- Ogsy Norge
- Oddvar Haaland
- Odd Johnsen
- Oksana Vyhovska
- Olivia Capital AS
- Osabi Omdal
- Optiker Ree
- Opplev Hald AS
- Oluf Lohne AS Konkursbo
- Oddmund Hennestad Døble
- Oline Hennestad Døble
- Osk Eiendom 1 AS
- Oluf Lohne Eiendom AS
- Oluf Lohne AS Konkursbo
- Oasen skole Mandal AS
- Oasen Skole Mandal AS
- Olje & Utstyr A/S
- Opplæringskontor for Byggfag
- Osb Anlegg AS Konkursbo
- Osb Anlegg AS Konkursbo
- Odd Harket Steindal
- Oksevollen 23-25
- Oksevollen 23-25
- Otto Svein Kragh
- Ove Rolf Torland
- Ole Kristian Eigebrekk
- Oakland Norge AS Konkursbo
- Oakland Møbler Fredrikstad AS
- Ole Bent Røiseland
- Oakland Norge AS Konkursbo
- Otera Infra AS Avd Mandal
- Oakland Møbler Bærum AS
- Odd Magne Ljosland
- Optimaliser Din Helse AS
- Olav Solberg Holding AS
- Ophaug Eiendom & Invest AS
- Odd Christian Juell-Hagen
- Olsen Stein og Betong AS
- Ole Guttorm Ihme Dødsbo
- Oakland Møbler Stavanger AS Konkursbo
- Oas Bil og Båtservice AS
- Oakland Møbler Stavanger AS Konkursbo
- O.A.N Holding AS
- Ole Georg Hjorteland - H.Bygg
- Opplæringskontoret for Byggfag i Mandal
- Olsen Stein og Betong AS Konkursbo
- Olsen Stein og Betong AS Konkursbo
- Omdal Consult V/Stacy Feyling Omdal
- Orient X-Press Pizza, Paulina Islam