The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12501 | Oil Inc | £ 1,596,655 | |
| 12502 | Oil Industry | £ 4,441,721 | |
| 12503 | Oil Rigger | £ 2,151,587,047 | |
| 12504 | Oilfield Industries | £ 9,854,297 | |
| 12505 | oiu | £ 5,498,037 | |
| 12506 | OJ da Juiceman | £ 109,855 | |
| 12507 | OK Tom | £ 213,436,455 | |
| 12508 | OKFurniture | £ 50,000 | |
| 12509 | OKG Shed | £ -329,334 | |
| 12510 | OKS 1 PTE LTD | £ 50,000 | |
| 12511 | OKS PTE LTD | £ 2,148,676 | |
| 12512 | OLafa | £ 5,088,982 | |
| 12513 | Oland Ltd | £ 50,000 | |
| 12514 | Olay | £ 352,245,749 | |
| 12515 | Old Age | £ 372,141,647 | |
| 12516 | Old Bay | £ 123,534,579 | |
| 12517 | Old Bill | £ 45,792,842 | |
| 12518 | Old Carpet | £ 163,972,008 | |
| 12519 | old farts | £ 3,542,428,093 | |
| 12520 | Old Feuds | £ 44,696,704 | |
| 12521 | Old Granny | £ 9,329,769 | |
| 12522 | old lard | £ -7,521,344 | |
| 12523 | old legends | £ 14,735,844 | |
| 12524 | Old men | £ 397,899,239 | |
| 12525 | Old No. 7 | £ 620,700,257 | |
| 12526 | Old people | £ 41,298,004 | |
| 12527 | Old Rocker | £ 389,278,276 | |
| 12528 | Old School | £ 5,514,041 | |
| 12529 | old skool butta | £ 614,087 | |
| 12530 | Old Smoky | £ 622,122,584 | |
| 12531 | Old Socks | £ 144,379,758 | |
| 12532 | Old Whiskey | £ 17,558,590 | |
| 12533 | Old World Industry | £ 1,734,908 | |
| 12534 | Old World Ventures | £ 50,000 | |
| 12535 | OlDirty | £ 47,991,916 | |
| 12536 | oldschool | £ 121,302,173 | |
| 12537 | Oligarchy | £ 556,860,397 | |
| 12538 | Oligarchy inc. | £ 7,116,723 | |
| 12539 | olis | £ 91,036,818 | |
| 12540 | Oliver Cromwell | £ 220,112,740 | |
| 12541 | Oliver Queen | £ 56,107,912 | |
| 12542 | Olivers Imagination | £ 124,320,555 | |
| 12543 | Olrik | £ 22,147,425 | |
| 12544 | Olympia | £ 112,782,553 | |
| 12545 | olympic rings | £ 3,084,696,830 | |
| 12546 | Olympics | £ 5,508,747 | |
| 12547 | Olympus | £ 2,062,876,669 | |
| 12548 | Omega | £ 6,183,955 | |
| 12549 | Omega Indusries | £ 37,799 | |
| 12550 | OmegaFox Inc. | £ 1,266,634 | |
| 12551 | Omelette | £ 10,061,528 | |
| 12552 | Omerta | £ 1,007,186,123 | |
| 12553 | Omerta Inc. | £ 5,500,096 | |
| 12554 | Omni | £ 26,585,058 | |
| 12555 | Omni Consumer Products | £ -23,968,848 | |
| 12556 | omni4 | £ 1,185,151 | |
| 12557 | Omnia | £ 29,796,207 | |
| 12558 | on a stick | £ 13,410 | |
| 12559 | On all you Candyass | £ 69,045,286 | |
| 12560 | On Industries | £ 1,896,074 | |
| 12561 | On It | £ 59,533,659 | |
| 12562 | On My Mind | £ 87,748,385 | |
| 12563 | On The Fritz | £ 79,242,996 | |
| 12564 | on the road | £ 405,722,546 | |
| 12565 | Once Upon a Time | £ 24,760,937 | |
| 12566 | Once Were Warriors | £ 54,754,263 | |
| 12567 | one | £ 341,379,992 | |
| 12568 | One and a Half | £ 8,610,014,000 | |
| 12569 | One Company | £ 398,709,264 | |
| 12570 | one dollar company | £ 37,781,362 | |
| 12571 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 12572 | One Hit Wonder | £ 30,087,678 | |
| 12573 | One Hundred Netro Bucks | £ 130,455,162 | |
| 12574 | One Insane Rastaman | £ 273,250,880 | |
| 12575 | one love | £ 3,838,898 | |
| 12576 | One Man | £ 3,996,240 | |
| 12577 | one man crying | £ 1,050,939,923 | |
| 12578 | One Mind | £ -5,139,455 | |
| 12579 | one of craze | £ 398,067,001 | |
| 12580 | One Piece | £ 11,282,781 | |
| 12581 | One Pound Fish | £ 1,584,921 | |
| 12582 | One Shot | £ 123,851,456 | |
| 12583 | One Silence | £ -4,074 | |
| 12584 | One to Many. | £ 4,976,234 | |
| 12585 | One United | £ 5,379,005 | |
| 12586 | one1 | £ 3,058,084 | |
| 12587 | OneNation | £ 45,456 | |
| 12588 | oneone | £ 18,206,569 | |
| 12589 | Oner | £ 10,516,756 | |
| 12590 | OneStopEnvelopeShoppe | £ -38,952 | |
| 12591 | Onion of Arabia | £ 11,458,256 | |
| 12592 | Onioninc | £ -43,613 | |
| 12593 | Onions | £ 56,031,337 | |
| 12594 | onions inc | £ 46,832,459 | |
| 12595 | ONLINE GAMES | £ 120,242,830 | |
| 12596 | Only Bombs Allowed | £ 57,741,277 | |
| 12597 | Only Fools and Horses | £ 859,719,219 | |
| 12598 | only me | £ 50,000 | |
| 12599 | only me inc | £ 133,078,068 | |
| 12600 | Onomatopoeias | £ 939,660 | |
