The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 15201 | One Insane Rastaman | £ 273,250,880 | |
| 15202 | one love | £ 3,838,898 | |
| 15203 | one man crying | £ 1,050,939,923 | |
| 15204 | One Mind | £ -5,139,455 | |
| 15205 | one of craze | £ 398,067,001 | |
| 15206 | One Piece | £ 11,282,781 | |
| 15207 | One Piece. | £ 240,965,499 | |
| 15208 | One Pound Fish | £ 1,584,921 | |
| 15209 | One Pound Transfers | £ -2,799,952 | |
| 15210 | One Shot | £ 123,851,456 | |
| 15211 | One Silence | £ -4,074 | |
| 15212 | One to Many. | £ 4,976,234 | |
| 15213 | one too many pints | £ 16,421,866 | |
| 15214 | One United | £ 5,379,005 | |
| 15215 | OneHATE | £ 129,050,981 | |
| 15216 | Onenos | £ 820,251,216 | |
| 15217 | oneone | £ 18,206,569 | |
| 15218 | Oner | £ 10,516,756 | |
| 15219 | OneStopEnvelopeShoppe | £ -38,952 | |
| 15220 | Onetical | £ 5,502,381 | |
| 15221 | Onioninc | £ -43,613 | |
| 15222 | Onions | £ 56,031,337 | |
| 15223 | ONLINE GAMES | £ 120,242,830 | |
| 15224 | online games. | £ 167,252,652 | |
| 15225 | Only 50k | £ 75,562,175 | |
| 15226 | Only Bombs Allowed | £ 57,741,277 | |
| 15227 | Only Fools and Horses | £ 859,719,219 | |
| 15228 | only me | £ 50,000 | |
| 15229 | only me inc | £ 133,078,068 | |
| 15230 | OnlyDollars | £ 929,042 | |
| 15231 | OnlyMoney | £ 4,556,121 | |
| 15232 | OnlyProfits | £ 5,059,024 | |
| 15233 | OnlyStocks | £ 4,382,795 | |
| 15234 | Onomatopoeias | £ 939,660 | |
| 15235 | Onshore Money | £ 104,918,400 | |
| 15236 | Ontara | £ 79,736,570 | |
| 15237 | Ontario | £ 159,783,223 | |
| 15238 | ontheblock | £ 6,402,837 | |
| 15239 | Onyx | £ 429,592 | |
| 15240 | OO7 | £ 24,682,212 | |
| 15241 | Ooglaigh na Heireann | £ 240,713,877 | |
| 15242 | oohyeaa | £ 50,844,745 | |
| 15243 | Oolacile-01 | £ 3,643,194 | |
| 15244 | oOoOo | £ 78,593,233 | |
| 15245 | oooooo | £ 5,505,528 | |
| 15246 | OOOoooOOO | £ 614,697 | |
| 15247 | oooPPPooo | £ -53,065 | |
| 15248 | oops | £ 965,477 | |
| 15249 | ooz | £ 320,966,832 | |
| 15250 | Opal Opal | £ 5,502,194 | |
| 15251 | Opec | £ 1,574,677,165 | |
| 15252 | Opel Dire | £ 5,505,993 | |
| 15253 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 15254 | Opera House | £ 123,137,933 | |
| 15255 | Operation Centerboard | £ 46,837,324 | |
| 15256 | OPERATION SEALION | £ 10,353,786 | |
| 15257 | OPERATION SEALION 2 | £ 5,504,218 | |
| 15258 | Ophthalmology | £ 45,575,639 | |
| 15259 | Opinion | £ 389,953,431 | |
| 15260 | OPiuM | £ 115,856,941 | |
| 15261 | Oppa Gangnam Style | £ 65,242,420 | |
| 15262 | Oppenheim | £ 51,959,450 | |
| 15263 | Oppenheimer | £ 1,424,302 | |
| 15264 | Oppertunity | £ 512,316,834 | |
| 15265 | Opportunities | £ 43,241,053 | |
| 15266 | Opportunity | £ 11,354,079 | |
| 15267 | Opposition | £ 761,831,311 | |
| 15268 | Oppression | £ 416,055,267 | |
| 15269 | OpRedStripe | £ 39,676,062 | |
| 15270 | optical | £ 500,098,293 | |
| 15271 | optics | £ 57,286,889 | |
| 15272 | Optimal Flames | £ 175,592,178 | |
| 15273 | Optimum Nutrition | £ -3,018,246 | |
| 15274 | Optimus Inc. | £ -2,482,292 | |
| 15275 | Options | £ 84,494,650 | |
| 15276 | Options Trading | £ 15,395,474 | |
| 15277 | Opus Dei | £ 1,501,110,304 | |
| 15278 | opus technology | £ 35,372,824 | |
| 15279 | Oracle | £ 5,067,108 | |
| 15280 | Orakos | £ 9,653,572 | |
| 15281 | Orange | £ 24,725,264 | |
| 15282 | Orange Aftershock | £ 67,681,186 | |
| 15283 | Orange Castle | £ 615,362 | |
| 15284 | Orange County | £ 4,910,507 | |
| 15285 | Orange Creatine | £ 6,196,167 | |
| 15286 | Orange Jelly | £ 6,594,926 | |
| 15287 | Orange Jooze | £ 1,261,621 | |
| 15288 | Orange Jooze 3 | £ 50,000 | |
| 15289 | Orange Jooze2 | £ 795,888 | |
| 15290 | Orange Jooze4 | £ 50,000 | |
| 15291 | Orange Jooze5 | £ 50,000 | |
| 15292 | Orange Paint | £ 97,288,036 | |
| 15293 | Oranginal | £ 4,103,756 | |
| 15294 | oranje | £ 4,966,784 | |
| 15295 | Orbital | £ 54,539,946 | |
| 15296 | Orbital Bombardment | £ 1,279,471,445 | |
| 15297 | Orbital Mechanics | £ 196,325,587 | |
| 15298 | Orbital Oasis | £ 61,220,273 | |
| 15299 | Orchids R Us Ltd | £ 39,331,588 | |
| 15300 | orcs | £ 2,521,634,731 | |
