The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 13501 | on a stick | £ 13,410 | |
| 13502 | On all you Candyass | £ 69,045,286 | |
| 13503 | On Industries | £ 1,896,074 | |
| 13504 | On It | £ 59,533,659 | |
| 13505 | On My Mind | £ 87,748,385 | |
| 13506 | On The Fritz | £ 79,242,996 | |
| 13507 | On the move | £ 75,511,115 | |
| 13508 | on the road | £ 405,722,546 | |
| 13509 | once | £ 2,261,363 | |
| 13510 | Once Said | £ 4,848,853 | |
| 13511 | Once Upon a Time | £ 24,760,937 | |
| 13512 | Once Were Warriors | £ 54,754,263 | |
| 13513 | one | £ 341,379,992 | |
| 13514 | One and a Half | £ 8,610,014,000 | |
| 13515 | One Company | £ 398,709,264 | |
| 13516 | one dollar company | £ 40,885,349 | |
| 13517 | One Enterprise | £ 5,940,523 | |
| 13518 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 13519 | One gun | £ 170,204,825 | |
| 13520 | One Hit Wonder | £ 30,087,678 | |
| 13521 | One Hundred Netro Bucks | £ 130,455,162 | |
| 13522 | One Insane Rastaman | £ 273,250,880 | |
| 13523 | one love | £ 3,838,898 | |
| 13524 | One Man | £ 3,996,240 | |
| 13525 | one man crying | £ 1,050,939,923 | |
| 13526 | One Mind | £ -5,139,455 | |
| 13527 | one of craze | £ 398,067,001 | |
| 13528 | One Piece | £ 11,282,781 | |
| 13529 | One Pound Fish | £ 1,584,921 | |
| 13530 | One Shot | £ 123,851,456 | |
| 13531 | One Silence | £ -4,074 | |
| 13532 | One to Many. | £ 4,976,234 | |
| 13533 | One Two Many | £ 52,155,167 | |
| 13534 | One United | £ 5,379,005 | |
| 13535 | one1 | £ 1,933,505 | |
| 13536 | OneNation | £ 45,456 | |
| 13537 | oneone | £ 18,206,569 | |
| 13538 | Oner | £ 10,516,756 | |
| 13539 | OneStopEnvelopeShoppe | £ -38,952 | |
| 13540 | Onion of Arabia | £ 11,458,256 | |
| 13541 | Onioninc | £ -43,613 | |
| 13542 | Onions | £ 56,031,337 | |
| 13543 | onions inc | £ 46,832,459 | |
| 13544 | ONLINE GAMES | £ 120,242,830 | |
| 13545 | Only Bombs Allowed | £ 57,741,277 | |
| 13546 | Only Fans | £ 266,046,346 | |
| 13547 | Only Fools and Horses | £ 859,719,219 | |
| 13548 | only me | £ 50,000 | |
| 13549 | only me inc | £ 133,078,068 | |
| 13550 | Onomatopoeias | £ 939,660 | |
| 13551 | Onshore Money | £ 104,918,400 | |
| 13552 | Ontara | £ 79,736,570 | |
| 13553 | Ontario | £ 85,260,376 | |
| 13554 | ontheblock | £ 6,402,837 | |
| 13555 | Onyx | £ 429,592 | |
| 13556 | OO7 | £ 11,267,872 | |
| 13557 | Ooglaigh na Heireann | £ 240,713,877 | |
| 13558 | oohyeaa | £ 50,844,745 | |
| 13559 | Oolacile-01 | £ 3,643,194 | |
| 13560 | oOoOo | £ 83,814,525 | |
| 13561 | oooooo | £ 5,505,528 | |
| 13562 | OOOoooOOO | £ 614,697 | |
| 13563 | oooPPPooo | £ -53,065 | |
| 13564 | oops | £ 965,477 | |
| 13565 | ooz | £ 320,966,832 | |
| 13566 | Opal Opal | £ 5,502,194 | |
| 13567 | Opec | £ 273,634,128 | |
| 13568 | Opel Dire | £ 5,505,993 | |
| 13569 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 13570 | Opera House | £ 22,161,500 | |
| 13571 | OPERATION SEALION | £ 10,353,786 | |
| 13572 | OPERATION SEALION 2 | £ 5,504,218 | |
| 13573 | Operations | £ 8,189,228 | |
| 13574 | Ophthalmology | £ 45,575,639 | |
| 13575 | opiates | £ 10,578,986 | |
| 13576 | Opinion | £ 389,953,431 | |
| 13577 | OPiuM | £ 115,856,941 | |
| 13578 | Oppa Gangnam Style | £ 65,242,420 | |
| 13579 | Oppenheim | £ 51,959,450 | |
| 13580 | Oppertunity | £ 512,316,834 | |
| 13581 | Opportunity | £ 11,354,079 | |
| 13582 | Opposition | £ 761,831,311 | |
| 13583 | Oppression | £ 416,055,267 | |
| 13584 | optical | £ 450,572,078 | |
| 13585 | Optimal Flames | £ 172,997,462 | |
| 13586 | Optimum Nutrition | £ -3,018,246 | |
| 13587 | Optimus Inc. | £ -2,482,292 | |
| 13588 | Options | £ 84,494,650 | |
| 13589 | Opus Dei | £ 694,720,428 | |
| 13590 | opus technology | £ 35,372,824 | |
| 13591 | Oracle | £ 5,067,108 | |
| 13592 | Orakos | £ 5,484,841 | |
| 13593 | Orang | £ 46,959,797 | |
| 13594 | Orange | £ 24,725,264 | |
| 13595 | Orange Aftershock | £ 67,681,186 | |
| 13596 | Orange Castle | £ 615,362 | |
| 13597 | Orange Creatine | £ 6,196,167 | |
| 13598 | Orange Inc. | £ 1,716,053 | |
| 13599 | Orange Jelly | £ 6,594,926 | |
| 13600 | Orange Jooze | £ 1,261,621 | |
