The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12201 | opus technology | £ 35,372,824 | |
| 12202 | Oracle | £ 5,067,108 | |
| 12203 | Orange | £ 24,725,264 | |
| 12204 | Orange Aftershock | £ 67,681,186 | |
| 12205 | Orange Castle | £ 615,362 | |
| 12206 | Orange Creatine | £ 6,196,167 | |
| 12207 | Orange Jelly | £ 6,594,926 | |
| 12208 | Orange Jooze | £ 1,261,621 | |
| 12209 | Orange Jooze 3 | £ 50,000 | |
| 12210 | Orange Jooze2 | £ 795,888 | |
| 12211 | Orange Jooze4 | £ 50,000 | |
| 12212 | Orange Jooze5 | £ 50,000 | |
| 12213 | Orange Paint | £ 97,288,036 | |
| 12214 | Oranginal | £ 4,103,756 | |
| 12215 | oranje | £ 4,966,784 | |
| 12216 | Orbital | £ 54,539,946 | |
| 12217 | Orbital Bombardment | £ 369,092,566 | |
| 12218 | Orchids R Us Ltd | £ 39,331,588 | |
| 12219 | orcs | £ 2,404,944,140 | |
| 12220 | Orcustra | £ 702,800 | |
| 12221 | Order | £ 176,233,665 | |
| 12222 | Oregon | £ 111,775,168 | |
| 12223 | OREO | £ 64,657,012 | |
| 12224 | Org | £ 18,286,924 | |
| 12225 | Organics Ltd | £ 105,054,559 | |
| 12226 | Organised Crime | £ 17,216,443 | |
| 12227 | Organized Crime | £ 62,808,878 | |
| 12228 | Orgia Co. | £ 4,887,593 | |
| 12229 | Orgy | £ 4,311,652,261 | |
| 12230 | Origin yartley | £ 37,041,694 | |
| 12231 | Original 16 | £ 132,618,089 | |
| 12232 | Original Sin | £ 141,442,446 | |
| 12233 | Originality | £ 1,357,128,017 | |
| 12234 | Origins | £ 63,035,912 | |
| 12235 | Orion | £ 47,648,728 | |
| 12236 | orm | £ 413,783,803 | |
| 12237 | orming | £ 56,130,756 | |
| 12238 | OronzoMafia | £ 560,700 | |
| 12239 | Orphans Court | £ 18,746,350 | |
| 12240 | Orphic Co. | £ 4,423,125 | |
| 12241 | Orquinox Co. | £ 1,119 | |
| 12242 | Orricks IT Services | £ 15,082,611 | |
| 12243 | Ortcaj | £ 77,296,813 | |
| 12244 | Orthanc Inc. | £ 147,448,563 | |
| 12245 | Osaka | £ 5,504,057 | |
| 12246 | Osakin | £ 6,161,131 | |
| 12247 | osca-websites | £ 9,181,996 | |
| 12248 | Oscar Meyer | £ 5,773,809 | |
| 12249 | Oscorp Industries | £ 179,374 | |
| 12250 | Osipolis | £ 16,660,041 | |
| 12251 | Osiris | £ 225,126,101 | |
| 12252 | osiris666 | £ -1,880,407 | |
| 12253 | Osmosis | £ 36,967,752 | |
| 12254 | Osprey Close | £ 53,590,765 | |
| 12255 | other comps | £ 171,188,256 | |
| 12256 | Otherones | £ 61,853,286 | |
| 12257 | Others | £ 26,039,960 | |
| 12258 | otherwil | £ 133,717 | |
| 12259 | otherwil2 | £ -34,567,223 | |
| 12260 | otherwil3 | £ 1,893,225 | |
| 12261 | otherwil4 | £ 4,826,025 | |
| 12262 | otherwil5 | £ 829,030 | |
| 12263 | Ottawa | £ 44,778,874 | |
| 12264 | Otto | £ 511,521,836 | |
| 12265 | OU812 | £ 295,106,966 | |
| 12266 | Ouija Industries | £ 345,812 | |
| 12267 | our butterfly | £ 1,134,896,288 | |
| 12268 | Our Discontent | £ 5,507,855 | |
| 12269 | Our Dollar | £ 173,827,178 | |
| 12270 | Our Doorstep | £ 1,396,159 | |
| 12271 | Our Golden Years | £ 899,774,013 | |
| 12272 | Our Good Name | £ 571,345,968 | |
| 12273 | Our Happy Memories | £ 34,408,558 | |
| 12274 | our judgement | £ 621,639,331 | |
| 12275 | our lifes | £ 103,839,465 | |
| 12276 | Our Lives | £ 60,309,789 | |
| 12277 | our Lord | £ 5,790,277 | |
| 12278 | Our Loved Ones | £ 106,677,737 | |
| 12279 | Our Times | £ 1,742,749 | |
| 12280 | Ours | £ 191,746,347 | |
| 12281 | Ourselves | £ 91,484,866 | |
| 12282 | out | £ 85,981,569 | |
| 12283 | Out of Nothing | £ 1,503,708 | |
| 12284 | Out Of The Blue | £ 802,183,265 | |
| 12285 | Out of town | £ 586,926 | |
| 12286 | Out You Go | £ 39,675,860 | |
| 12287 | outbreak | £ 561,418,136 | |
| 12288 | Outer Haven | £ 1,440,720 | |
| 12289 | Outer Heaven | £ 58,665,319 | |
| 12290 | Outlandish Labs LLC | £ 1,478,185 | |
| 12291 | Outlands | £ 155,639,513 | |
| 12292 | Outlaw | £ 4,594,026 | |
| 12293 | Outletsales | £ 1,793,596 | |
| 12294 | Outrageous Fortune | £ 210,155,594 | |
| 12295 | Outsourcing LLC | £ 4,372,708 | |
| 12296 | Outtathisworld plc | £ 1,236,092 | |
| 12297 | Outworld | £ 75,608,832 | |
| 12298 | Ovation | £ 2,547,061 | |
| 12299 | Over A Pub | £ 97,048,135 | |
| 12300 | Over Priced | £ 73,067,141 | |
