The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16401 | Old Whiskey | £ 78,899,948 | |
| 16402 | Old Wisteria | £ 51,324,515 | |
| 16403 | Old World Industry | £ 1,734,908 | |
| 16404 | Old World Ventures | £ 50,000 | |
| 16405 | OlDirty | £ 47,991,916 | |
| 16406 | oldschool | £ 125,860,243 | |
| 16407 | Oligarchy | £ 1,027,197,133 | |
| 16408 | Oligarchy inc. | £ 7,116,723 | |
| 16409 | olis | £ 91,036,818 | |
| 16410 | Olivers Imagination | £ 124,320,555 | |
| 16411 | olives | £ 568,111,602 | |
| 16412 | Olives ltd | £ 2,575,542 | |
| 16413 | Ollio Inc. | £ 6,159,098 | |
| 16414 | Ollio2 Inc. | £ -2,232,039 | |
| 16415 | Ollio3 Inc. | £ -680,853 | |
| 16416 | Olrik | £ 22,147,425 | |
| 16417 | Olympia | £ 137,542,127 | |
| 16418 | Olympiazuli | £ 110,512,970 | |
| 16419 | olympic rings | £ 3,084,696,830 | |
| 16420 | Olympics | £ 5,508,747 | |
| 16421 | Olympus | £ 2,084,999,378 | |
| 16422 | OMD | £ 339,034,023 | |
| 16423 | Omega | £ 6,183,955 | |
| 16424 | Omega Indusries | £ 37,799 | |
| 16425 | OmegaFox Inc. | £ 1,266,634 | |
| 16426 | Omens | £ 1,530,887,762 | |
| 16427 | Omerta | £ 1,007,186,123 | |
| 16428 | Omerta Inc. | £ 5,500,096 | |
| 16429 | OMG I Need Help | £ 55,594,816 | |
| 16430 | omission | £ 258,806,447 | |
| 16431 | Omni Consumer Products | £ 32,296,370 | |
| 16432 | Omni Future Corp 1 | £ 855,512,970 | |
| 16433 | omni4 | £ 1,185,151 | |
| 16434 | OmniCorp | £ 5,503,691 | |
| 16435 | Omnifarious | £ 2,360,838,488 | |
| 16436 | Omnificent | £ 2,321,277,749 | |
| 16437 | Omnipotent | £ 2,218,375,349 | |
| 16438 | Omnipresent | £ 2,257,248,277 | |
| 16439 | Omniscient | £ 2,478,385,168 | |
| 16440 | Omnitool | £ 4,640,506 | |
| 16441 | on a stick | £ 13,410 | |
| 16442 | On Industries | £ 1,896,074 | |
| 16443 | On It | £ 59,533,659 | |
| 16444 | On My Mind | £ 87,748,385 | |
| 16445 | ON PATCHWERK | £ 399,366,790 | |
| 16446 | On Patrol | £ 14,657,296 | |
| 16447 | On The Fritz | £ 79,242,996 | |
| 16448 | on the hills | £ 188,017,475 | |
| 16449 | On the move | £ 148,754,126 | |
| 16450 | on the road | £ 405,722,546 | |
| 16451 | on yourself | £ 126,998,452 | |
| 16452 | On-Shore Cash | £ 49,999,999 | |
| 16453 | On-Shore Cash 2 | £ 46,186,132 | |
| 16454 | On-Shore Cash 3 | £ 39,360,787 | |
| 16455 | Once In A Blue Moon | £ 46,541,211 | |
| 16456 | Once Upon a Time | £ 24,760,937 | |
| 16457 | Once Were Warriors | £ 54,754,263 | |
| 16458 | one | £ 341,379,992 | |
| 16459 | One and a Half | £ 8,610,014,000 | |
| 16460 | One Company | £ 398,709,264 | |
| 16461 | One Company Rule | £ 51,242,256 | |
| 16462 | one dollar company | £ 40,885,349 | |
| 16463 | One Enterprise | £ 5,940,523 | |
| 16464 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16465 | One gun | £ 1,391,933,195 | |
| 16466 | One Hit Wonder | £ 30,087,678 | |
| 16467 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16468 | One Insane Rastaman | £ 273,250,880 | |
| 16469 | one love | £ 3,838,898 | |
| 16470 | one man crying | £ 1,050,939,923 | |
| 16471 | One Man in My Heart | £ 50,000 | |
| 16472 | One Million | £ 165,579,163 | |
| 16473 | One Mind | £ -5,139,455 | |
| 16474 | one more wont hurt | £ 35,169,608 | |
| 16475 | one of craze | £ 398,067,001 | |
| 16476 | One Piece | £ 11,282,781 | |
| 16477 | One Piece. | £ 40,965,499 | |
| 16478 | One Pound Fish | £ 1,584,921 | |
| 16479 | One Pound Transfers | £ -2,799,952 | |
| 16480 | One Shot | £ 123,851,456 | |
| 16481 | One Silence | £ -4,074 | |
| 16482 | One to Many. | £ 4,976,234 | |
| 16483 | one too many pints | £ 353,128,608 | |
| 16484 | One United | £ 5,379,005 | |
| 16485 | OneHATE | £ 67,247,345 | |
| 16486 | Onenos | £ 113,504,559 | |
| 16487 | oneone | £ 18,206,569 | |
| 16488 | Oner | £ 10,516,756 | |
| 16489 | ones for you | £ 50,000 | |
| 16490 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16491 | Onetical | £ 5,502,381 | |
| 16492 | Onioninc | £ -43,613 | |
| 16493 | Onions | £ 56,031,337 | |
| 16494 | ONLINE GAMES | £ 161,675,350 | |
| 16495 | online games. | £ 167,252,652 | |
| 16496 | Only 50k | £ 120,794,156 | |
| 16497 | Only Bombs Allowed | £ 57,741,277 | |
| 16498 | Only Fools and Horses | £ 859,719,219 | |
| 16499 | Only Grans | £ 122,787,706 | |
| 16500 | only me | £ 50,000 | |
