The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 13401 | olympic rings | £ 3,084,696,830 | |
| 13402 | Olympics | £ 5,508,747 | |
| 13403 | Olympus | £ 2,062,876,669 | |
| 13404 | Omega | £ 6,183,955 | |
| 13405 | Omega Indusries | £ 37,799 | |
| 13406 | OmegaFox Inc. | £ 1,266,634 | |
| 13407 | Omelette | £ 10,061,528 | |
| 13408 | Omerta | £ 1,007,186,123 | |
| 13409 | Omerta Inc. | £ 5,500,096 | |
| 13410 | Omni | £ 26,585,058 | |
| 13411 | Omni Consumer Products | £ -23,968,848 | |
| 13412 | omni4 | £ 1,185,151 | |
| 13413 | Omnia | £ 29,796,207 | |
| 13414 | Omnifarious | £ 554,008,141 | |
| 13415 | Omnificent | £ 652,882,927 | |
| 13416 | Omnipotent | £ 682,993,843 | |
| 13417 | Omnipresent | £ 630,640,487 | |
| 13418 | Omniscient | £ 737,210,735 | |
| 13419 | Omnitool | £ 5,603,878 | |
| 13420 | on a stick | £ 13,410 | |
| 13421 | On all you Candyass | £ 69,045,286 | |
| 13422 | On Industries | £ 1,896,074 | |
| 13423 | On It | £ 59,533,659 | |
| 13424 | On My Mind | £ 87,748,385 | |
| 13425 | On The Fritz | £ 79,242,996 | |
| 13426 | On the move | £ 75,511,115 | |
| 13427 | on the road | £ 405,722,546 | |
| 13428 | once | £ 2,261,363 | |
| 13429 | Once Said | £ 4,848,853 | |
| 13430 | Once Upon a Time | £ 24,760,937 | |
| 13431 | Once Were Warriors | £ 54,754,263 | |
| 13432 | one | £ 341,379,992 | |
| 13433 | One and a Half | £ 8,610,014,000 | |
| 13434 | One Company | £ 398,709,264 | |
| 13435 | one dollar company | £ 40,885,349 | |
| 13436 | One Enterprise | £ 5,940,523 | |
| 13437 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 13438 | One gun | £ 170,204,825 | |
| 13439 | One Hit Wonder | £ 30,087,678 | |
| 13440 | One Hundred Netro Bucks | £ 130,455,162 | |
| 13441 | One Insane Rastaman | £ 273,250,880 | |
| 13442 | one love | £ 3,838,898 | |
| 13443 | One Man | £ 3,996,240 | |
| 13444 | one man crying | £ 1,050,939,923 | |
| 13445 | One Mind | £ -5,139,455 | |
| 13446 | one of craze | £ 398,067,001 | |
| 13447 | One Piece | £ 11,282,781 | |
| 13448 | One Pound Fish | £ 1,584,921 | |
| 13449 | One Shot | £ 123,851,456 | |
| 13450 | One Silence | £ -4,074 | |
| 13451 | One to Many. | £ 4,976,234 | |
| 13452 | One Two Many | £ 52,358,838 | |
| 13453 | One United | £ 5,379,005 | |
| 13454 | one1 | £ 1,933,505 | |
| 13455 | OneNation | £ 45,456 | |
| 13456 | oneone | £ 18,206,569 | |
| 13457 | Oner | £ 10,516,756 | |
| 13458 | OneStopEnvelopeShoppe | £ -38,952 | |
| 13459 | Onion of Arabia | £ 11,458,256 | |
| 13460 | Onioninc | £ -43,613 | |
| 13461 | Onions | £ 56,031,337 | |
| 13462 | onions inc | £ 46,832,459 | |
| 13463 | ONLINE GAMES | £ 120,242,830 | |
| 13464 | Only Bombs Allowed | £ 57,741,277 | |
| 13465 | Only Fans | £ 260,908,359 | |
| 13466 | Only Fools and Horses | £ 859,719,219 | |
| 13467 | only me | £ 50,000 | |
| 13468 | only me inc | £ 133,078,068 | |
| 13469 | Onomatopoeias | £ 939,660 | |
| 13470 | Onshore Money | £ 104,918,400 | |
| 13471 | Ontara | £ 79,736,570 | |
| 13472 | Ontario | £ 85,260,376 | |
| 13473 | ontheblock | £ 6,402,837 | |
| 13474 | Onyx | £ 429,592 | |
| 13475 | OO7 | £ 11,267,872 | |
| 13476 | Ooglaigh na Heireann | £ 240,713,877 | |
| 13477 | oohyeaa | £ 50,844,745 | |
| 13478 | Oolacile-01 | £ 3,643,194 | |
| 13479 | oOoOo | £ 81,338,494 | |
| 13480 | oooooo | £ 5,505,528 | |
| 13481 | OOOoooOOO | £ 614,697 | |
| 13482 | oooPPPooo | £ -53,065 | |
| 13483 | oops | £ 965,477 | |
| 13484 | ooz | £ 320,966,832 | |
| 13485 | Opal Opal | £ 5,502,194 | |
| 13486 | Opec | £ 273,634,128 | |
| 13487 | Opel Dire | £ 5,505,993 | |
| 13488 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 13489 | Opera House | £ 18,031,280 | |
| 13490 | Operations | £ 8,189,228 | |
| 13491 | Ophthalmology | £ 45,575,639 | |
| 13492 | opiates | £ 10,578,986 | |
| 13493 | Opinion | £ 389,953,431 | |
| 13494 | OPiuM | £ 115,856,941 | |
| 13495 | Oppa Gangnam Style | £ 65,242,420 | |
| 13496 | Oppenheim | £ 51,959,450 | |
| 13497 | Oppertunity | £ 512,316,834 | |
| 13498 | Opportunity | £ 11,354,079 | |
| 13499 | Opposition | £ 761,831,311 | |
| 13500 | Oppression | £ 416,055,267 | |
