The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 13201 | Onshore Money | £ 104,918,400 | |
| 13202 | Ontara | £ 79,736,570 | |
| 13203 | Ontario | £ 85,260,376 | |
| 13204 | ontheblock | £ 6,402,837 | |
| 13205 | Onyx | £ 429,592 | |
| 13206 | OO7 | £ 55,808,206 | |
| 13207 | Ooglaigh na Heireann | £ 240,713,877 | |
| 13208 | oohyeaa | £ 50,844,745 | |
| 13209 | Oolacile-01 | £ 3,643,194 | |
| 13210 | oOoOo | £ 248,934,291 | |
| 13211 | oooooo | £ 5,505,528 | |
| 13212 | OOOoooOOO | £ 614,697 | |
| 13213 | oooPPPooo | £ -53,065 | |
| 13214 | oops | £ 965,477 | |
| 13215 | ooz | £ 320,966,832 | |
| 13216 | Opal Opal | £ 5,502,194 | |
| 13217 | Opec | £ 273,634,128 | |
| 13218 | Opel Dire | £ 5,505,993 | |
| 13219 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 13220 | Opera House | £ 14,278,464 | |
| 13221 | Operations | £ 8,189,228 | |
| 13222 | Ophthalmology | £ 45,575,639 | |
| 13223 | opiates | £ 10,578,986 | |
| 13224 | Opinion | £ 389,953,431 | |
| 13225 | OPiuM | £ 115,856,941 | |
| 13226 | Oppa Gangnam Style | £ 65,242,420 | |
| 13227 | Oppenheim | £ 51,959,450 | |
| 13228 | Oppertunity | £ 512,316,834 | |
| 13229 | Opportunity | £ 11,354,079 | |
| 13230 | Opposition | £ 761,831,311 | |
| 13231 | Oppression | £ 416,055,267 | |
| 13232 | optical | £ 449,516,871 | |
| 13233 | Optimal Flames | £ 168,931,399 | |
| 13234 | Optimum Nutrition | £ -3,018,246 | |
| 13235 | Optimus Inc. | £ -2,482,292 | |
| 13236 | Options | £ 84,494,650 | |
| 13237 | Opus Dei | £ 694,720,428 | |
| 13238 | opus technology | £ 35,372,824 | |
| 13239 | Oracle | £ 5,067,108 | |
| 13240 | Orakos | £ 5,484,841 | |
| 13241 | Orang | £ 46,959,797 | |
| 13242 | Orange | £ 24,725,264 | |
| 13243 | Orange Aftershock | £ 67,681,186 | |
| 13244 | Orange Castle | £ 615,362 | |
| 13245 | Orange Creatine | £ 6,196,167 | |
| 13246 | Orange Jelly | £ 6,594,926 | |
| 13247 | Orange Jooze | £ 1,261,621 | |
| 13248 | Orange Jooze 3 | £ 50,000 | |
| 13249 | Orange Jooze2 | £ 795,888 | |
| 13250 | Orange Jooze4 | £ 50,000 | |
| 13251 | Orange Jooze5 | £ 50,000 | |
| 13252 | Orange Juice | £ 115,215,977 | |
| 13253 | Orange Paint | £ 97,288,036 | |
| 13254 | Oranginal | £ 4,103,756 | |
| 13255 | oranje | £ 4,966,784 | |
| 13256 | Orbital | £ 54,539,946 | |
| 13257 | Orbital Bombardment | £ 1,188,671,445 | |
| 13258 | Orbital Mechanics | £ 34,525,238 | |
| 13259 | Orchids R Us Ltd | £ 39,331,588 | |
| 13260 | orcs | £ 2,521,634,731 | |
| 13261 | Orcustra | £ 702,800 | |
| 13262 | Order | £ 176,233,665 | |
| 13263 | ordinary matter | £ 193,533,812 | |
| 13264 | Oregon | £ 111,775,168 | |
| 13265 | OREO | £ 64,657,012 | |
| 13266 | Org | £ 18,286,924 | |
| 13267 | Organic Beaver | £ 48,683,222 | |
| 13268 | Organics Ltd | £ 105,054,559 | |
| 13269 | Organised Crime | £ 17,216,443 | |
| 13270 | Organized Crime | £ 62,808,878 | |
| 13271 | Orgia Co. | £ 4,887,593 | |
| 13272 | Orgy | £ 4,445,038,883 | |
| 13273 | Origin yartley | £ 37,041,694 | |
| 13274 | Original 16 | £ 132,618,089 | |
| 13275 | Original Sin | £ 141,442,446 | |
| 13276 | Originality | £ 1,357,128,017 | |
| 13277 | Origins | £ 63,035,912 | |
| 13278 | Orino | £ 56,346,103 | |
| 13279 | Orion | £ 47,648,728 | |
| 13280 | orm | £ 413,783,803 | |
| 13281 | orming | £ 109,142,927 | |
| 13282 | OronzoMafia | £ 5,474,161 | |
| 13283 | Orphans Court | £ 298,605,506 | |
| 13284 | Orphic Co. | £ 4,423,125 | |
| 13285 | Orquinox Co. | £ 1,119 | |
| 13286 | Orricks IT Services | £ 15,082,611 | |
| 13287 | Ortcaj | £ 77,296,813 | |
| 13288 | Orthanc Inc. | £ 147,448,563 | |
| 13289 | Osaka | £ 5,504,057 | |
| 13290 | Osakin | £ 6,161,131 | |
| 13291 | osca-websites | £ 9,181,996 | |
| 13292 | Oscar Meyer | £ 5,773,809 | |
| 13293 | Oscorp Industries | £ 179,374 | |
| 13294 | OSHA Six Flags | £ 5,346,082 | |
| 13295 | Osho | £ 4,055,871 | |
| 13296 | Osipolis | £ 16,660,041 | |
| 13297 | Osiris | £ 225,126,101 | |
| 13298 | osiris666 | £ -1,880,407 | |
| 13299 | osiris6971 | £ 10,377,105 | |
| 13300 | Osmosis | £ 41,633,292 | |
