- O'LA-LA Advertising-bureaus, Open Company
- O-hara, Open Company (TM O'HARA)
- O-lja-lja, Open Company company
- O.A. Kyrnis, entrepreneur
- o.k.group
OAO" Aleksandriyskaya factory of the diagram papers "
OAO "Kharkov-Promtekhteks"
Oasis TM, Open Company
Oasis, SPD
Oberon, state of emergency- Obedinennaja Ukraine the future, OO
- OBERIG
- Obltorgservis, Open Company
- Oblonskiy Billiard Boutique, DP (the Obolonsky Billiard boutique)
- Obriй, state of emergency
- Obrij-pak, state of emergency
- Obriй, Open Company
- Obsidiant, Open Company
- Obt Privat, Open Company
- Obukhovgorvtorresursy, state of emergency
- Obvious M. M, SPD
- OBіS, OPEN COMPANY
Ocean, NPP- Ocheretnjuk V.V., state of emergency
- October hammer, the Chernigov mechanical-repair factory, Open Society
- Odds, Open Company
- Odds, Open Company TPK
- Ode, state of emergency (GNPP "Elektronmash")
- ODE the White Leopard, Open Company
Odessa metiznaya the company, Open Company- Odevaska, state of emergency
- Odessa Textiles, Open Company
Odis Marinas, Open Company- Odikom, Open Company
Odikon, state of emergency
Odintsova A.G., SPD
Odissey Motors (new and second-hand technics from Japan)- Odvikom, Open Company
- Odysseus KS, Open Company
Odzhi-furniture, Open Company- Office of Those Service, Open Company
- Office-centre, Open Company
Officeland, STATE OF EMERGENCY- Office-prestige, Open Company
- Office-trading, Open Company
- Office the Shop Ukraine, Open Company
Office, the House and Telecommunications, Open Company Oditel- Office equipment, Open Society
Office equipment, Open Company- Office th, Open Company
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