| OATP On Air Travelproduction Aktiebolag | Saltsjö-Boo | 0 tkr |
| Öberg & Partners AB | Saltsjö-Boo | 0 tkr |
| O-Comanche Djur & Natur AB | Norrtälje | 0 tkr |
| Ocon Invest AB | Saltsjö-Boo | 0 tkr |
| OCT Kapitalförvaltning AB | Saltsjö-Boo | 0 tkr |
| Odda Holding AB | Vendelsö | 0 tkr |
| Odd Parity AB | Gustavsberg | 0 tkr |
| Offecto AB | Gagnef | 0 tkr |
| Off-White AB | Åsarna | 0 tkr |
| Ogallala Aktiebolag | Saltsjöbaden | 0 tkr |
| Ogallala Holding AB | Saltsjöbaden | 0 tkr |
| Ogeborgen AB | Nacka | 0 tkr |
| Ohlind, Ohlsson & Lindström Entreprenad AB | Nacka | 0 tkr |
| Öhrnell Teknik AB | Nacka | 0 tkr |
| OINF Invest AB | Saltsjö-Boo | 0 tkr |
| OJOB AB | Saltsjö-Duvnäs | 0 tkr |
| Okasmaa Holdings AB | Nacka | 0 tkr |
| O'Konor Invest AB | Saltsjöbaden | 0 tkr |
| Oktatrol AB | Saltsjö-Boo | 0 tkr |
| OKV Holding AB | Nacka | 0 tkr |
| Ola Strömberg International Aktiebolag | Stockholm | 0 tkr |
| Oldsoft AB | Saltsjö-Boo | 0 tkr |
| Olga-Rock Invest AB | Stockholm | 0 tkr |
| Olifant AB | Stockholm | 0 tkr |
| Olisak Framtid AB | Västerås | 0 tkr |
| Olisak Invest AB | Nyköping | 0 tkr |
| Olivander Holding AB | Saltsjö-Boo | 0 tkr |
| Olle Carlenarson AB | Nacka | 0 tkr |
| Olle Hedberg AB | Saltsjö-Boo | 0 tkr |
| OL Leveranser AB | Älta | 0 tkr |
| Olof Johan Rågmark Advokatbyrå AB | Saltsjöbaden | 0 tkr |
| OMA Holding AB | Älta | 0 tkr |
| Ombak Förvaltning AB | Saltsjö-Boo | 0 tkr |
| Ombak Holding AB | Saltsjö-Boo | 0 tkr |
| OMBoolag1 AB | Saltsjö-Boo | 0 tkr |
| Omni Security AB | Saltsjö-Boo | 0 tkr |
| One in 200 AB | Stockholm | 0 tkr |
| On Worldguides Aktiebolag | Saltsjö-Boo | 0 tkr |
| Opalinsky Innovation AB | Adress Saknas | 0 tkr |
| OP Andersson Verksamheter AB | Saltsjöbaden | 0 tkr |
| OPeco AB | Saltsjö-Boo | 0 tkr |
| Open Connector AB | Nacka | 0 tkr |
| Optisec AB | Saltsjö-Boo | 0 tkr |
| Optivalue Advisory AB | Saltsjö-Boo | 0 tkr |
| OR3 Fastigheter Holding AB | Saltsjö-Duvnäs | 0 tkr |
| OraMed Aktiebolag | Stockholm | 0 tkr |
| Ordcon AB | Nacka | 0 tkr |
| Örla AB | Saltsjö-Boo | 0 tkr |
| Ormegard Corporate AB | Saltsjöbaden | 0 tkr |
| Orminge Trä Bygg & Fastighetscentrum AB | Saltsjö-Boo | 0 tkr |