The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12201 | OKS PTE LTD | £ 2,148,676 | |
| 12202 | OLafa | £ 5,088,982 | |
| 12203 | Oland Ltd | £ 50,000 | |
| 12204 | Olay | £ 290,473,960 | |
| 12205 | Old Age | £ 372,141,647 | |
| 12206 | Old Bay | £ 123,534,579 | |
| 12207 | Old Bill | £ 45,792,842 | |
| 12208 | Old Carpet | £ 163,972,008 | |
| 12209 | old farts | £ 3,399,428,093 | |
| 12210 | Old Feuds | £ 44,696,704 | |
| 12211 | Old Granny | £ 9,329,769 | |
| 12212 | old lard | £ -7,521,344 | |
| 12213 | old legends | £ 14,735,844 | |
| 12214 | Old men | £ 397,899,239 | |
| 12215 | Old No. 7 | £ 620,700,257 | |
| 12216 | Old people | £ 41,298,004 | |
| 12217 | Old Rocker | £ 31,006,016 | |
| 12218 | Old School | £ 5,514,041 | |
| 12219 | old skool butta | £ 614,087 | |
| 12220 | Old Smoky | £ 622,122,584 | |
| 12221 | Old Socks | £ 144,379,758 | |
| 12222 | Old Whiskey | £ 17,558,590 | |
| 12223 | Old World Industry | £ 1,734,908 | |
| 12224 | Old World Ventures | £ 50,000 | |
| 12225 | OlDirty | £ 47,991,916 | |
| 12226 | oldschool | £ 50,536,236 | |
| 12227 | Oligarchy | £ 556,860,397 | |
| 12228 | Oligarchy inc. | £ 7,116,723 | |
| 12229 | olis | £ 91,036,818 | |
| 12230 | Oliver Cromwell | £ 220,112,740 | |
| 12231 | Oliver Queen | £ 56,107,912 | |
| 12232 | Olivers Imagination | £ 124,320,555 | |
| 12233 | Olrik | £ 22,147,425 | |
| 12234 | Olympia | £ 112,782,553 | |
| 12235 | olympic rings | £ 3,079,055,927 | |
| 12236 | Olympics | £ 5,508,747 | |
| 12237 | Olympus | £ 1,064,275,402 | |
| 12238 | Omega | £ 6,183,955 | |
| 12239 | Omega Indusries | £ 37,799 | |
| 12240 | OmegaFox Inc. | £ 1,266,634 | |
| 12241 | Omelette | £ 10,061,528 | |
| 12242 | Omerta | £ 1,007,186,123 | |
| 12243 | Omerta Inc. | £ 5,500,096 | |
| 12244 | Omni | £ 26,585,058 | |
| 12245 | Omni Consumer Products | £ -17,242,872 | |
| 12246 | omni4 | £ 1,185,151 | |
| 12247 | Omnia | £ 29,796,207 | |
| 12248 | on a stick | £ 13,410 | |
| 12249 | On all you Candyass | £ 69,045,286 | |
| 12250 | On Industries | £ 1,896,074 | |
| 12251 | On It | £ 59,533,659 | |
| 12252 | On My Mind | £ 87,748,385 | |
| 12253 | On The Fritz | £ 79,242,996 | |
| 12254 | on the road | £ 213,722,546 | |
| 12255 | Once Upon a Time | £ 24,760,937 | |
| 12256 | Once Were Warriors | £ 54,754,263 | |
| 12257 | one | £ 341,379,992 | |
| 12258 | One and a Half | £ 8,610,014,000 | |
| 12259 | One Company | £ 398,709,264 | |
| 12260 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 12261 | One Hit Wonder | £ 30,087,678 | |
| 12262 | One Hundred Netro Bucks | £ 117,744,854 | |
| 12263 | One Insane Rastaman | £ 269,342,710 | |
| 12264 | one love | £ 3,838,898 | |
| 12265 | one man crying | £ 1,051,065,353 | |
| 12266 | One Mind | £ -5,139,455 | |
| 12267 | one of craze | £ 398,067,001 | |
| 12268 | One Piece | £ 11,282,781 | |
| 12269 | One Pound Fish | £ 1,584,921 | |
| 12270 | One Shot | £ 123,851,456 | |
| 12271 | One Silence | £ -4,074 | |
| 12272 | One to Many. | £ 4,976,234 | |
| 12273 | One United | £ 5,379,005 | |
| 12274 | one1 | £ 3,058,084 | |
| 12275 | OneNation | £ 45,456 | |
| 12276 | oneone | £ 18,206,569 | |
| 12277 | Oner | £ 10,516,756 | |
| 12278 | OneStopEnvelopeShoppe | £ -38,952 | |
| 12279 | Onion of Arabia | £ 11,458,256 | |
| 12280 | Onions | £ 56,031,337 | |
| 12281 | onions inc | £ 46,832,459 | |
| 12282 | ONLINE GAMES | £ 120,242,830 | |
| 12283 | Only Bombs Allowed | £ 57,741,277 | |
| 12284 | Only Fools and Horses | £ 859,719,219 | |
| 12285 | only me | £ 50,000 | |
| 12286 | only me inc | £ 133,078,068 | |
| 12287 | Onomatopoeias | £ 939,660 | |
| 12288 | Onshore Money | £ 104,918,400 | |
| 12289 | Ontara | £ 79,736,570 | |
| 12290 | Ontario | £ 85,260,376 | |
| 12291 | ontheblock | £ 6,402,837 | |
| 12292 | Onyx | £ 429,592 | |
| 12293 | OO7 | £ 5,508,861 | |
| 12294 | Ooglaigh na Heireann | £ 240,713,877 | |
| 12295 | oohyeaa | £ 50,844,745 | |
| 12296 | Oolacile-01 | £ 2,954,344 | |
| 12297 | oOoOo | £ 31,474,744 | |
| 12298 | oooooo | £ 5,505,528 | |
| 12299 | OOOoooOOO | £ 614,697 | |
| 12300 | oooPPPooo | £ -53,065 | |
