The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16501 | Omerta Inc. | £ 5,500,096 | |
| 16502 | OMG I Need Help | £ 20,468,571 | |
| 16503 | omission | £ 198,806,447 | |
| 16504 | Omni | £ 26,585,058 | |
| 16505 | Omni Consumer Products | £ 32,296,370 | |
| 16506 | Omni Future Corp 1 | £ 855,512,970 | |
| 16507 | omni4 | £ 1,185,151 | |
| 16508 | Omnia | £ 29,796,207 | |
| 16509 | OmniCorp | £ 5,503,691 | |
| 16510 | Omnifarious | £ 2,360,838,488 | |
| 16511 | Omnificent | £ 2,321,277,749 | |
| 16512 | Omnipotent | £ 2,218,375,349 | |
| 16513 | Omnipresent | £ 2,257,248,277 | |
| 16514 | Omniscient | £ 2,478,385,168 | |
| 16515 | Omnitool | £ 4,640,506 | |
| 16516 | on a stick | £ 13,410 | |
| 16517 | On Industries | £ 1,896,074 | |
| 16518 | On It | £ 59,533,659 | |
| 16519 | On My Mind | £ 87,748,385 | |
| 16520 | ON PATCHWERK | £ 399,366,790 | |
| 16521 | On Patrol | £ 148,087,996 | |
| 16522 | On The Fritz | £ 79,242,996 | |
| 16523 | On the move | £ 144,453,102 | |
| 16524 | on the road | £ 405,722,546 | |
| 16525 | on yourself | £ 126,998,452 | |
| 16526 | Once In A Blue Moon | £ 46,942,078 | |
| 16527 | Once Upon a Time | £ 24,760,937 | |
| 16528 | Once Were Warriors | £ 54,754,263 | |
| 16529 | one | £ 341,379,992 | |
| 16530 | One and a Half | £ 8,610,014,000 | |
| 16531 | One Company | £ 398,709,264 | |
| 16532 | one dollar company | £ 40,885,349 | |
| 16533 | One Enterprise | £ 5,940,523 | |
| 16534 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16535 | One gun | £ 1,381,284,458 | |
| 16536 | One Hit Wonder | £ 30,087,678 | |
| 16537 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16538 | One Insane Rastaman | £ 273,250,880 | |
| 16539 | one love | £ 3,838,898 | |
| 16540 | one man crying | £ 1,050,939,923 | |
| 16541 | One Million | £ 44,557,902 | |
| 16542 | One Mind | £ -5,139,455 | |
| 16543 | one more wont hurt | £ 48,689,114 | |
| 16544 | one of craze | £ 398,067,001 | |
| 16545 | One Piece | £ 11,282,781 | |
| 16546 | One Piece. | £ 40,965,499 | |
| 16547 | One Pound Fish | £ 1,584,921 | |
| 16548 | One Pound Transfers | £ -2,799,952 | |
| 16549 | One Shot | £ 123,851,456 | |
| 16550 | One Silence | £ -4,074 | |
| 16551 | One to Many. | £ 4,976,234 | |
| 16552 | one too many pints | £ 307,128,608 | |
| 16553 | One United | £ 5,379,005 | |
| 16554 | OneHATE | £ 221,749,145 | |
| 16555 | Onenos | £ 216,753,496 | |
| 16556 | oneone | £ 18,206,569 | |
| 16557 | Oner | £ 10,516,756 | |
| 16558 | Onerous | £ 40,516,043 | |
| 16559 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16560 | Onetical | £ 5,502,381 | |
| 16561 | Onioninc | £ -43,613 | |
| 16562 | Onions | £ 56,031,337 | |
| 16563 | ONLINE GAMES | £ 120,242,830 | |
| 16564 | online games. | £ 167,252,652 | |
| 16565 | Only 50k | £ 120,794,156 | |
| 16566 | Only Bombs Allowed | £ 57,741,277 | |
| 16567 | Only Fools and Horses | £ 859,719,219 | |
| 16568 | Only Grans | £ 52,787,706 | |
| 16569 | only me | £ 50,000 | |
| 16570 | only me inc | £ 133,078,068 | |
| 16571 | OnlyDollars | £ 929,042 | |
| 16572 | OnlyMoney | £ 4,556,121 | |
| 16573 | OnlyProfits | £ 5,059,024 | |
| 16574 | OnlyStocks | £ 4,382,795 | |
| 16575 | Onomatopoeias | £ 939,660 | |
| 16576 | Onshore Money | £ 104,918,400 | |
| 16577 | Onslaught | £ 173,133,263 | |
| 16578 | Ontara | £ 79,736,570 | |
| 16579 | Ontario | £ 159,783,223 | |
| 16580 | ontheblock | £ 6,402,837 | |
| 16581 | Onyx | £ 429,592 | |
| 16582 | OO7 | £ 24,682,212 | |
| 16583 | Oodnadatta | £ 2,300,000 | |
| 16584 | Ooglaigh na Heireann | £ 240,713,877 | |
| 16585 | oohyeaa | £ 50,844,745 | |
| 16586 | Oolacile-01 | £ 3,643,194 | |
| 16587 | oOoOo | £ 82,717,145 | |
| 16588 | oooooo | £ 5,505,528 | |
| 16589 | OOOoooOOO | £ 614,697 | |
| 16590 | oooPPPooo | £ -53,065 | |
| 16591 | oops | £ 965,477 | |
| 16592 | ooz | £ 320,966,832 | |
| 16593 | Opal Opal | £ 5,502,194 | |
| 16594 | Opec | £ 1,574,677,165 | |
| 16595 | Opel Dire | £ 5,505,993 | |
| 16596 | Open AI | £ 50,000 | |
| 16597 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 16598 | Open Goal | £ 2,425,721 | |
| 16599 | Openhammer | £ 40,330,703 | |
| 16600 | Opera House | £ 123,137,933 | |
