The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12501 | Onion of Arabia | £ 11,458,256 | |
| 12502 | Onions | £ 56,031,337 | |
| 12503 | onions inc | £ 46,832,459 | |
| 12504 | ONLINE GAMES | £ 120,242,830 | |
| 12505 | Only Bombs Allowed | £ 57,741,277 | |
| 12506 | Only Fools and Horses | £ 859,719,219 | |
| 12507 | only me | £ 50,000 | |
| 12508 | only me inc | £ 133,078,068 | |
| 12509 | Onomatopoeias | £ 939,660 | |
| 12510 | Onshore Money | £ 104,918,400 | |
| 12511 | Ontara | £ 79,736,570 | |
| 12512 | Ontario | £ 85,260,376 | |
| 12513 | ontheblock | £ 6,402,837 | |
| 12514 | Onyx | £ 429,592 | |
| 12515 | OO7 | £ 55,808,206 | |
| 12516 | Ooglaigh na Heireann | £ 240,713,877 | |
| 12517 | oohyeaa | £ 50,844,745 | |
| 12518 | Oolacile-01 | £ 2,954,344 | |
| 12519 | oOoOo | £ 94,962,888 | |
| 12520 | oooooo | £ 5,505,528 | |
| 12521 | OOOoooOOO | £ 614,697 | |
| 12522 | oooPPPooo | £ -53,065 | |
| 12523 | oops | £ 965,477 | |
| 12524 | ooz | £ 320,966,832 | |
| 12525 | Opal Opal | £ 5,502,194 | |
| 12526 | Opec | £ 273,634,128 | |
| 12527 | Opel Dire | £ 5,505,993 | |
| 12528 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 12529 | Operation Racoon City | £ 4,748,173 | |
| 12530 | Operations | £ 8,189,228 | |
| 12531 | Ophthalmology | £ 45,575,639 | |
| 12532 | opiates | £ 10,578,986 | |
| 12533 | Opinion | £ 389,953,431 | |
| 12534 | OPiuM | £ 115,856,941 | |
| 12535 | Oppa Gangnam Style | £ 65,242,420 | |
| 12536 | Oppenheim | £ 51,959,450 | |
| 12537 | Oppertunity | £ 458,210,505 | |
| 12538 | Opportunity | £ 11,354,079 | |
| 12539 | Opposition | £ 761,831,311 | |
| 12540 | Oppression | £ 416,055,267 | |
| 12541 | optical | £ 449,516,871 | |
| 12542 | Optimal Flames | £ 168,931,399 | |
| 12543 | Optimum Nutrition | £ -3,018,246 | |
| 12544 | Optimus Inc. | £ -2,482,292 | |
| 12545 | Options | £ 84,494,650 | |
| 12546 | Opus Dei | £ 694,720,428 | |
| 12547 | opus technology | £ 35,372,824 | |
| 12548 | Oracle | £ 5,067,108 | |
| 12549 | Orakos | £ 5,484,841 | |
| 12550 | Orange | £ 24,725,264 | |
| 12551 | Orange Aftershock | £ 67,681,186 | |
| 12552 | Orange Castle | £ 615,362 | |
| 12553 | Orange Creatine | £ 6,196,167 | |
| 12554 | Orange Jelly | £ 6,594,926 | |
| 12555 | Orange Jooze | £ 1,261,621 | |
| 12556 | Orange Jooze 3 | £ 50,000 | |
| 12557 | Orange Jooze2 | £ 795,888 | |
| 12558 | Orange Jooze4 | £ 50,000 | |
| 12559 | Orange Jooze5 | £ 50,000 | |
| 12560 | Orange Juice | £ 8,342,885 | |
| 12561 | Orange Paint | £ 97,288,036 | |
| 12562 | Oranginal | £ 4,103,756 | |
| 12563 | oranje | £ 4,966,784 | |
| 12564 | Orbital | £ 54,539,946 | |
| 12565 | Orbital Bombardment | £ 1,186,891,621 | |
| 12566 | Orchids R Us Ltd | £ 39,331,588 | |
| 12567 | orcs | £ 2,521,634,731 | |
| 12568 | Orcustra | £ 702,800 | |
| 12569 | Order | £ 176,233,665 | |
| 12570 | Oregon | £ 111,775,168 | |
| 12571 | OREO | £ 64,657,012 | |
| 12572 | Org | £ 18,286,924 | |
| 12573 | Organic Beaver | £ 48,683,222 | |
| 12574 | Organics Ltd | £ 105,054,559 | |
| 12575 | Organised Crime | £ 17,216,443 | |
| 12576 | Organized Crime | £ 62,808,878 | |
| 12577 | Orgia Co. | £ 4,887,593 | |
| 12578 | Orgy | £ 4,311,652,261 | |
| 12579 | Origin yartley | £ 37,041,694 | |
| 12580 | Original 16 | £ 132,618,089 | |
| 12581 | Original Sin | £ 141,442,446 | |
| 12582 | Originality | £ 1,357,128,017 | |
| 12583 | Origins | £ 63,035,912 | |
| 12584 | Orion | £ 47,648,728 | |
| 12585 | orm | £ 413,783,803 | |
| 12586 | orming | £ 100,606,868 | |
| 12587 | OronzoMafia | £ 560,700 | |
| 12588 | Orphans Court | £ 18,746,350 | |
| 12589 | Orphic Co. | £ 4,423,125 | |
| 12590 | Orquinox Co. | £ 1,119 | |
| 12591 | Orricks IT Services | £ 15,082,611 | |
| 12592 | Ortcaj | £ 77,296,813 | |
| 12593 | Orthanc Inc. | £ 147,448,563 | |
| 12594 | Osaka | £ 5,504,057 | |
| 12595 | Osakin | £ 6,161,131 | |
| 12596 | osca-websites | £ 9,181,996 | |
| 12597 | Oscar Meyer | £ 5,773,809 | |
| 12598 | Oscorp Industries | £ 179,374 | |
| 12599 | OSHA Six Flags | £ 5,346,082 | |
| 12600 | Osho | £ 3,381,493 | |
