The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12601 | Onomatopoeias | £ 939,660 | |
| 12602 | Onshore Money | £ 104,918,400 | |
| 12603 | Ontara | £ 79,736,570 | |
| 12604 | Ontario | £ 85,260,376 | |
| 12605 | ontheblock | £ 6,402,837 | |
| 12606 | Onyx | £ 429,592 | |
| 12607 | OO7 | £ 55,808,206 | |
| 12608 | Ooglaigh na Heireann | £ 240,713,877 | |
| 12609 | oohyeaa | £ 50,844,745 | |
| 12610 | Oolacile-01 | £ 2,954,344 | |
| 12611 | oOoOo | £ 127,987,622 | |
| 12612 | oooooo | £ 5,505,528 | |
| 12613 | OOOoooOOO | £ 614,697 | |
| 12614 | oooPPPooo | £ -53,065 | |
| 12615 | oops | £ 965,477 | |
| 12616 | ooz | £ 320,966,832 | |
| 12617 | Opal Opal | £ 5,502,194 | |
| 12618 | Opec | £ 273,634,128 | |
| 12619 | Opel Dire | £ 5,505,993 | |
| 12620 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 12621 | Operation Racoon City | £ 4,748,173 | |
| 12622 | Operations | £ 8,189,228 | |
| 12623 | Ophthalmology | £ 45,575,639 | |
| 12624 | opiates | £ 10,578,986 | |
| 12625 | Opinion | £ 389,953,431 | |
| 12626 | OPiuM | £ 115,856,941 | |
| 12627 | Oppa Gangnam Style | £ 65,242,420 | |
| 12628 | Oppenheim | £ 51,959,450 | |
| 12629 | Oppertunity | £ 470,741,410 | |
| 12630 | Opportunity | £ 11,354,079 | |
| 12631 | Opposition | £ 761,831,311 | |
| 12632 | Oppression | £ 416,055,267 | |
| 12633 | optical | £ 449,516,871 | |
| 12634 | Optimal Flames | £ 168,931,399 | |
| 12635 | Optimum Nutrition | £ -3,018,246 | |
| 12636 | Optimus Inc. | £ -2,482,292 | |
| 12637 | Options | £ 84,494,650 | |
| 12638 | Opus Dei | £ 694,720,428 | |
| 12639 | opus technology | £ 35,372,824 | |
| 12640 | Oracle | £ 5,067,108 | |
| 12641 | Orakos | £ 5,484,841 | |
| 12642 | Orange | £ 24,725,264 | |
| 12643 | Orange Aftershock | £ 67,681,186 | |
| 12644 | Orange Castle | £ 615,362 | |
| 12645 | Orange Creatine | £ 6,196,167 | |
| 12646 | Orange Jelly | £ 6,594,926 | |
| 12647 | Orange Jooze | £ 1,261,621 | |
| 12648 | Orange Jooze 3 | £ 50,000 | |
| 12649 | Orange Jooze2 | £ 795,888 | |
| 12650 | Orange Jooze4 | £ 50,000 | |
| 12651 | Orange Jooze5 | £ 50,000 | |
| 12652 | Orange Juice | £ 13,188,390 | |
| 12653 | Orange Paint | £ 97,288,036 | |
| 12654 | Oranginal | £ 4,103,756 | |
| 12655 | oranje | £ 4,966,784 | |
| 12656 | Orbital | £ 54,539,946 | |
| 12657 | Orbital Bombardment | £ 1,188,671,445 | |
| 12658 | Orchids R Us Ltd | £ 39,331,588 | |
| 12659 | orcs | £ 2,521,634,731 | |
| 12660 | Orcustra | £ 702,800 | |
| 12661 | Order | £ 176,233,665 | |
| 12662 | Oregon | £ 111,775,168 | |
| 12663 | OREO | £ 64,657,012 | |
| 12664 | Org | £ 18,286,924 | |
| 12665 | Organic Beaver | £ 48,683,222 | |
| 12666 | Organics Ltd | £ 105,054,559 | |
| 12667 | Organised Crime | £ 17,216,443 | |
| 12668 | Organized Crime | £ 62,808,878 | |
| 12669 | Orgia Co. | £ 4,887,593 | |
| 12670 | Orgy | £ 4,311,652,261 | |
| 12671 | Origin yartley | £ 37,041,694 | |
| 12672 | Original 16 | £ 132,618,089 | |
| 12673 | Original Sin | £ 141,442,446 | |
| 12674 | Originality | £ 1,357,128,017 | |
| 12675 | Origins | £ 63,035,912 | |
| 12676 | Orion | £ 47,648,728 | |
| 12677 | orm | £ 413,783,803 | |
| 12678 | orming | £ 109,142,927 | |
| 12679 | OronzoMafia | £ 1,661,538 | |
| 12680 | Orphans Court | £ 74,927,395 | |
| 12681 | Orphic Co. | £ 4,423,125 | |
| 12682 | Orquinox Co. | £ 1,119 | |
| 12683 | Orricks IT Services | £ 15,082,611 | |
| 12684 | Ortcaj | £ 77,296,813 | |
| 12685 | Orthanc Inc. | £ 147,448,563 | |
| 12686 | Osaka | £ 5,504,057 | |
| 12687 | Osakin | £ 6,161,131 | |
| 12688 | osca-websites | £ 9,181,996 | |
| 12689 | Oscar Meyer | £ 5,773,809 | |
| 12690 | Oscorp Industries | £ 179,374 | |
| 12691 | OSHA Six Flags | £ 5,346,082 | |
| 12692 | Osho | £ 4,055,871 | |
| 12693 | Osipolis | £ 16,660,041 | |
| 12694 | Osiris | £ 225,126,101 | |
| 12695 | osiris666 | £ -1,880,407 | |
| 12696 | osiris6971 | £ 10,377,105 | |
| 12697 | Osmosis | £ 36,967,752 | |
| 12698 | Osprey Close | £ 53,590,765 | |
| 12699 | other comps | £ 246,694,183 | |
| 12700 | Other Reality | £ 4,518,202 | |
