The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16201 | Olympics | £ 5,508,747 | |
| 16202 | Olympus | £ 2,084,999,378 | |
| 16203 | OMD | £ 339,034,023 | |
| 16204 | Omega | £ 6,183,955 | |
| 16205 | Omega Indusries | £ 37,799 | |
| 16206 | OmegaFox Inc. | £ 1,266,634 | |
| 16207 | Omens | £ 1,449,798,609 | |
| 16208 | Omerta | £ 1,007,186,123 | |
| 16209 | Omerta Inc. | £ 5,500,096 | |
| 16210 | OMG I Need Help | £ 44,463,705 | |
| 16211 | omission | £ 258,806,447 | |
| 16212 | Omni Consumer Products | £ 32,296,370 | |
| 16213 | Omni Future Corp 1 | £ 855,512,970 | |
| 16214 | omni4 | £ 1,185,151 | |
| 16215 | OmniCorp | £ 5,503,691 | |
| 16216 | Omnifarious | £ 2,360,838,488 | |
| 16217 | Omnificent | £ 2,321,277,749 | |
| 16218 | Omnipotent | £ 2,218,375,349 | |
| 16219 | Omnipresent | £ 2,257,248,277 | |
| 16220 | Omniscient | £ 2,478,385,168 | |
| 16221 | Omnitool | £ 4,640,506 | |
| 16222 | on a stick | £ 13,410 | |
| 16223 | On Industries | £ 1,896,074 | |
| 16224 | On It | £ 59,533,659 | |
| 16225 | On My Mind | £ 87,748,385 | |
| 16226 | ON PATCHWERK | £ 399,366,790 | |
| 16227 | On Patrol | £ 148,087,996 | |
| 16228 | On The Fritz | £ 79,242,996 | |
| 16229 | on the hills | £ 55,007,465 | |
| 16230 | On the move | £ 144,453,102 | |
| 16231 | on the road | £ 405,722,546 | |
| 16232 | on yourself | £ 126,998,452 | |
| 16233 | Once In A Blue Moon | £ 46,313,410 | |
| 16234 | Once Upon a Time | £ 24,760,937 | |
| 16235 | Once Were Warriors | £ 54,754,263 | |
| 16236 | one | £ 341,379,992 | |
| 16237 | One and a Half | £ 8,610,014,000 | |
| 16238 | One Company | £ 398,709,264 | |
| 16239 | One Company Rule | £ 31,742,256 | |
| 16240 | one dollar company | £ 40,885,349 | |
| 16241 | One Enterprise | £ 5,940,523 | |
| 16242 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16243 | One gun | £ 1,381,284,458 | |
| 16244 | One Hit Wonder | £ 30,087,678 | |
| 16245 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16246 | One Insane Rastaman | £ 273,250,880 | |
| 16247 | one love | £ 3,838,898 | |
| 16248 | one man crying | £ 1,050,939,923 | |
| 16249 | One Million | £ 152,457,316 | |
| 16250 | One Mind | £ -5,139,455 | |
| 16251 | one more wont hurt | £ 49,307,476 | |
| 16252 | one of craze | £ 398,067,001 | |
| 16253 | One Piece | £ 11,282,781 | |
| 16254 | One Piece. | £ 40,965,499 | |
| 16255 | One Pound Fish | £ 1,584,921 | |
| 16256 | One Pound Transfers | £ -2,799,952 | |
| 16257 | One Shot | £ 123,851,456 | |
| 16258 | One Silence | £ -4,074 | |
| 16259 | One to Many. | £ 4,976,234 | |
| 16260 | one too many pints | £ 353,128,608 | |
| 16261 | One United | £ 5,379,005 | |
| 16262 | OneHATE | £ 50,747,345 | |
| 16263 | Onenos | £ 116,773,102 | |
| 16264 | oneone | £ 18,206,569 | |
| 16265 | Oner | £ 10,516,756 | |
| 16266 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16267 | Onetical | £ 5,502,381 | |
| 16268 | Onioninc | £ -43,613 | |
| 16269 | Onions | £ 56,031,337 | |
| 16270 | ONLINE GAMES | £ 120,242,830 | |
| 16271 | online games. | £ 167,252,652 | |
| 16272 | Only 50k | £ 120,794,156 | |
| 16273 | Only Bombs Allowed | £ 57,741,277 | |
| 16274 | Only Fools and Horses | £ 859,719,219 | |
| 16275 | Only Grans | £ 122,787,706 | |
| 16276 | only me | £ 50,000 | |
| 16277 | only me inc | £ 133,078,068 | |
| 16278 | OnlyDollars | £ 929,042 | |
| 16279 | OnlyMoney | £ 4,556,121 | |
| 16280 | OnlyProfits | £ 5,059,024 | |
| 16281 | OnlyStocks | £ 4,382,795 | |
| 16282 | Onomatopoeias | £ 939,660 | |
| 16283 | Onshore Money | £ 104,918,400 | |
| 16284 | Onslaught | £ 173,378,826 | |
| 16285 | Ontara | £ 79,736,570 | |
| 16286 | Ontario | £ 159,783,223 | |
| 16287 | ontheblock | £ 6,402,837 | |
| 16288 | Onyx | £ 429,592 | |
| 16289 | OO7 | £ 24,682,212 | |
| 16290 | Oodnadatta | £ 2,300,000 | |
| 16291 | Ooglaigh na Heireann | £ 240,713,877 | |
| 16292 | oohyeaa | £ 50,844,745 | |
| 16293 | Oolacile-01 | £ 3,643,194 | |
| 16294 | oOoOo | £ 82,717,145 | |
| 16295 | oooooo | £ 5,505,528 | |
| 16296 | OOOoooOOO | £ 614,697 | |
| 16297 | oooPPPooo | £ -53,065 | |
| 16298 | oops | £ 965,477 | |
| 16299 | ooz | £ 320,966,832 | |
| 16300 | Opal Opal | £ 5,502,194 | |
