The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16301 | oldschool | £ 125,860,243 | |
| 16302 | Oligarchy | £ 1,027,197,133 | |
| 16303 | Oligarchy inc. | £ 7,116,723 | |
| 16304 | olis | £ 91,036,818 | |
| 16305 | Olivers Imagination | £ 124,320,555 | |
| 16306 | olives | £ 568,111,602 | |
| 16307 | Olives ltd | £ 2,575,542 | |
| 16308 | Ollio Inc. | £ 6,159,098 | |
| 16309 | Ollio2 Inc. | £ -2,232,039 | |
| 16310 | Ollio3 Inc. | £ -680,853 | |
| 16311 | Olrik | £ 22,147,425 | |
| 16312 | Olympia | £ 128,457,245 | |
| 16313 | Olympiazuli | £ 34,613,605 | |
| 16314 | olympic rings | £ 3,084,696,830 | |
| 16315 | Olympics | £ 5,508,747 | |
| 16316 | Olympus | £ 2,084,999,378 | |
| 16317 | OMD | £ 339,034,023 | |
| 16318 | Omega | £ 6,183,955 | |
| 16319 | Omega Indusries | £ 37,799 | |
| 16320 | OmegaFox Inc. | £ 1,266,634 | |
| 16321 | Omens | £ 1,479,798,609 | |
| 16322 | Omerta | £ 1,007,186,123 | |
| 16323 | Omerta Inc. | £ 5,500,096 | |
| 16324 | OMG I Need Help | £ 75,627,646 | |
| 16325 | omission | £ 258,806,447 | |
| 16326 | Omni Consumer Products | £ 32,296,370 | |
| 16327 | Omni Future Corp 1 | £ 855,512,970 | |
| 16328 | omni4 | £ 1,185,151 | |
| 16329 | OmniCorp | £ 5,503,691 | |
| 16330 | Omnifarious | £ 2,360,838,488 | |
| 16331 | Omnificent | £ 2,321,277,749 | |
| 16332 | Omnipotent | £ 2,218,375,349 | |
| 16333 | Omnipresent | £ 2,257,248,277 | |
| 16334 | Omniscient | £ 2,478,385,168 | |
| 16335 | Omnitool | £ 4,640,506 | |
| 16336 | on a stick | £ 13,410 | |
| 16337 | On Industries | £ 1,896,074 | |
| 16338 | On It | £ 59,533,659 | |
| 16339 | On My Mind | £ 87,748,385 | |
| 16340 | ON PATCHWERK | £ 399,366,790 | |
| 16341 | On Patrol | £ 11,850,729 | |
| 16342 | On The Fritz | £ 79,242,996 | |
| 16343 | on the hills | £ 87,774,647 | |
| 16344 | On the move | £ 144,453,102 | |
| 16345 | on the road | £ 405,722,546 | |
| 16346 | on yourself | £ 126,998,452 | |
| 16347 | Once In A Blue Moon | £ 46,316,989 | |
| 16348 | Once Upon a Time | £ 24,760,937 | |
| 16349 | Once Were Warriors | £ 54,754,263 | |
| 16350 | one | £ 341,379,992 | |
| 16351 | One and a Half | £ 8,610,014,000 | |
| 16352 | One Body | £ 7,182,999 | |
| 16353 | One Company | £ 398,709,264 | |
| 16354 | One Company Rule | £ 51,242,256 | |
| 16355 | one dollar company | £ 40,885,349 | |
| 16356 | One Enterprise | £ 5,940,523 | |
| 16357 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16358 | One gun | £ 1,381,284,458 | |
| 16359 | One Hit Wonder | £ 30,087,678 | |
| 16360 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16361 | One Insane Rastaman | £ 273,250,880 | |
| 16362 | one love | £ 3,838,898 | |
| 16363 | one man crying | £ 1,050,939,923 | |
| 16364 | One Million | £ 123,411,956 | |
| 16365 | One Mind | £ -5,139,455 | |
| 16366 | one more wont hurt | £ 51,356,938 | |
| 16367 | one of craze | £ 398,067,001 | |
| 16368 | One Piece | £ 11,282,781 | |
| 16369 | One Piece. | £ 40,965,499 | |
| 16370 | One Pound Fish | £ 1,584,921 | |
| 16371 | One Pound Transfers | £ -2,799,952 | |
| 16372 | One Shot | £ 123,851,456 | |
| 16373 | One Silence | £ -4,074 | |
| 16374 | One to Many. | £ 4,976,234 | |
| 16375 | one too many pints | £ 353,128,608 | |
| 16376 | One United | £ 5,379,005 | |
| 16377 | OneHATE | £ 67,247,345 | |
| 16378 | Onenos | £ 116,798,745 | |
| 16379 | oneone | £ 18,206,569 | |
| 16380 | Oner | £ 10,516,756 | |
| 16381 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16382 | Onetical | £ 5,502,381 | |
| 16383 | Onioninc | £ -43,613 | |
| 16384 | Onions | £ 56,031,337 | |
| 16385 | ONLINE GAMES | £ 120,242,830 | |
| 16386 | online games. | £ 167,252,652 | |
| 16387 | Only 50k | £ 120,794,156 | |
| 16388 | Only Bombs Allowed | £ 57,741,277 | |
| 16389 | Only Fools and Horses | £ 859,719,219 | |
| 16390 | Only Grans | £ 122,787,706 | |
| 16391 | only me | £ 50,000 | |
| 16392 | only me inc | £ 133,078,068 | |
| 16393 | OnlyDollars | £ 929,042 | |
| 16394 | OnlyMoney | £ 4,556,121 | |
| 16395 | OnlyProfits | £ 5,059,024 | |
| 16396 | OnlyStocks | £ 4,382,795 | |
| 16397 | Onomatopoeias | £ 939,660 | |
| 16398 | Onshore Money | £ 104,918,400 | |
| 16399 | Onslaught | £ 173,378,826 | |
| 16400 | Ontara | £ 79,736,570 | |
