The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16201 | ocean star | £ 3,580,849,318 | |
| 16202 | Oceanic Enterprises | £ -50,808 | |
| 16203 | Oceans 11 | £ 58,500,636 | |
| 16204 | Oceans 12 | £ 10,291,638 | |
| 16205 | Oceans 13 | £ 132,219,759 | |
| 16206 | Oceans Eleven | £ 8,485,684 | |
| 16207 | Ocelot | £ 194,460,230 | |
| 16208 | Och Noooo | £ 1,506,119 | |
| 16209 | Octavian | £ 4,631,188 | |
| 16210 | October 1066 | £ 81,732,927 | |
| 16211 | October 1854 | £ 290,795,624 | |
| 16212 | October 2014 | £ 94,385,046 | |
| 16213 | Octopia | £ 9,626,521 | |
| 16214 | Octopus Garden | £ 4,050,927 | |
| 16215 | Odd Things | £ 973,073 | |
| 16216 | Oddjob | £ 16,604,273 | |
| 16217 | Odds and ends | £ 156,357,963 | |
| 16218 | Odds on Favorite | £ 74,346,727 | |
| 16219 | Oddysay | £ 2,896,867 | |
| 16220 | Oden | £ 641,394,649 | |
| 16221 | oden wrath | £ 1,735,842,850 | |
| 16222 | odin | £ 8,811,968 | |
| 16223 | Odin Mafia | £ 8,768,668 | |
| 16224 | Odin the Wanderer | £ 4,687,105 | |
| 16225 | Odo | £ 32,513,900 | |
| 16226 | Odqan | £ 188,512,804 | |
| 16227 | Odyssey | £ 334,944,633 | |
| 16228 | of a black widow | £ 201,523,785 | |
| 16229 | Of a Brutal Empire | £ 36,359,377 | |
| 16230 | of a Solar Empire | £ 46,660,163 | |
| 16231 | Of A Time | £ 27,824,181 | |
| 16232 | Of All Your Land | £ 48,121,892 | |
| 16233 | of Belfast | £ 83,371,566 | |
| 16234 | Of Bomb | £ 5,131,350 | |
| 16235 | of CFC | £ 5,455,120 | |
| 16236 | Of Every Position | £ 61,887,884 | |
| 16237 | Of Friday the 13th | £ 50,000 | |
| 16238 | of Impendium | £ 349,441 | |
| 16239 | Of My Label | £ 435,033,841 | |
| 16240 | of my secrets | £ 268,367,366 | |
| 16241 | of of | £ 7,075,463 | |
| 16242 | of of of of of of of of | £ 50,000 | |
| 16243 | of REASON | £ 1,154,429 | |
| 16244 | of RHC | £ 68,042,901 | |
| 16245 | Of Scotland | £ 1,304,795,018 | |
| 16246 | Of The Boards | £ 14,794,127 | |
| 16247 | of the devil | £ 27,539,344 | |
| 16248 | of The Hat | £ 5,507,097 | |
| 16249 | of the heap | £ 66,771,581 | |
| 16250 | of the lost | £ 69,257,675 | |
| 16251 | of the monsters | £ 41,126,098 | |
| 16252 | Of The Road | £ 146,979,140 | |
| 16253 | of the runite | £ 4,694,589 | |
| 16254 | Of The UVF | £ 133,321,393 | |
| 16255 | Of the world | £ 2,007,785 | |
| 16256 | of. | £ 335,457,109 | |
| 16257 | Ofcom | £ 306,858,410 | |
| 16258 | Off | £ 30,575,148 | |
| 16259 | Off His Trolly | £ 10,806,044 | |
| 16260 | off it | £ 5,261,275 | |
| 16261 | Offenbach | £ 382,674,581 | |
| 16262 | Offender | £ 187,520,330 | |
| 16263 | Offensive Behaviour | £ 509,861,247 | |
| 16264 | Offensive Security | £ 215,291,542 | |
| 16265 | Official Location | £ 179,832,369 | |
| 16266 | Official Secrets Act | £ 2,153,443 | |
| 16267 | OfflineTV | £ 56,600,622 | |
| 16268 | Offroad Trucker | £ 155,675,119 | |
| 16269 | Offshore Accounts | £ 39,206,670 | |
| 16270 | Offshore Cash | £ 60,279,702 | |
| 16271 | Offshore Trading Company | £ 5,141,246 | |
| 16272 | Ofsted Inspection Regime | £ 61,751,261 | |
| 16273 | og esaelP | £ 4,208,484 | |
| 16274 | ogkush | £ 2,491,394 | |
| 16275 | Ogrimmar | £ 35,379,515 | |
| 16276 | Oh Herro | £ 2,995,837 | |
| 16277 | Oh Jesus Christ | £ 9,142,153 | |
| 16278 | Oh My God | £ 43,837,801 | |
| 16279 | Oh No | £ 12,615,641 | |
| 16280 | Oh YEAH | £ 2,549,726 | |
| 16281 | ohara inc | £ -165,571 | |
| 16282 | ohe herrow | £ 5,703,509 | |
| 16283 | Ohio | £ 150,051,814 | |
| 16284 | Ohms | £ 359,066,630 | |
| 16285 | Ohnoitsmymothernlaw | £ 5,504,562 | |
| 16286 | Ohtaku inc | £ 3,600,029 | |
| 16287 | Ohtaku inc1 | £ 4,456,703 | |
| 16288 | Ohtaku inc2 | £ 1,267,353 | |
| 16289 | Ohtaku inc3 | £ 4,191,984 | |
| 16290 | Ohtaku inc4 | £ 4,118,968 | |
| 16291 | ohyesyesh | £ 50,000 | |
| 16292 | Oil | £ 833,968,470 | |
| 16293 | Oil CONGLOMO | £ 2,646,845 | |
| 16294 | Oil Field | £ 271,568 | |
| 16295 | Oil First | £ 49,880 | |
| 16296 | Oil Inc | £ 1,610,027 | |
| 16297 | Oil Industry | £ 4,441,721 | |
| 16298 | Oil Rigger | £ 2,151,587,047 | |
| 16299 | Oil Tycoon | £ 5,374,700 | |
| 16300 | Oilfield Industries | £ 9,854,297 | |
