The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12501 | Original Sin | £ 141,442,446 | |
| 12502 | Originality | £ 1,357,128,017 | |
| 12503 | Origins | £ 63,035,912 | |
| 12504 | Orion | £ 47,648,728 | |
| 12505 | orm | £ 413,783,803 | |
| 12506 | orming | £ 56,130,756 | |
| 12507 | OronzoMafia | £ 560,700 | |
| 12508 | Orphans Court | £ 18,746,350 | |
| 12509 | Orphic Co. | £ 4,423,125 | |
| 12510 | Orquinox Co. | £ 1,119 | |
| 12511 | Orricks IT Services | £ 15,082,611 | |
| 12512 | Ortcaj | £ 77,296,813 | |
| 12513 | Orthanc Inc. | £ 147,448,563 | |
| 12514 | Osaka | £ 5,504,057 | |
| 12515 | Osakin | £ 6,161,131 | |
| 12516 | osca-websites | £ 9,181,996 | |
| 12517 | Oscar Meyer | £ 5,773,809 | |
| 12518 | Oscorp Industries | £ 179,374 | |
| 12519 | OSHA Six Flags | £ 5,346,082 | |
| 12520 | Osipolis | £ 16,660,041 | |
| 12521 | Osiris | £ 225,126,101 | |
| 12522 | osiris666 | £ -1,880,407 | |
| 12523 | osiris6971 | £ 10,377,105 | |
| 12524 | Osmosis | £ 36,967,752 | |
| 12525 | Osprey Close | £ 53,590,765 | |
| 12526 | other comps | £ 171,572,056 | |
| 12527 | Other Reality | £ 4,518,202 | |
| 12528 | Otherones | £ 61,853,286 | |
| 12529 | Others | £ 26,039,960 | |
| 12530 | otherwil | £ 133,717 | |
| 12531 | otherwil2 | £ -34,567,223 | |
| 12532 | otherwil3 | £ 1,893,225 | |
| 12533 | otherwil4 | £ 4,826,025 | |
| 12534 | otherwil5 | £ 829,030 | |
| 12535 | Ottawa | £ 44,778,874 | |
| 12536 | Otto | £ 511,521,836 | |
| 12537 | OU812 | £ 295,106,966 | |
| 12538 | OuCh | £ 17,035,035 | |
| 12539 | Ouija Industries | £ 345,812 | |
| 12540 | our butterfly | £ 1,134,896,288 | |
| 12541 | Our Discontent | £ 5,507,855 | |
| 12542 | Our Dollar | £ 173,827,178 | |
| 12543 | Our Doorstep | £ 1,396,159 | |
| 12544 | Our Golden Years | £ 908,659,300 | |
| 12545 | Our Good Name | £ 571,345,968 | |
| 12546 | Our Happy Memories | £ 34,408,558 | |
| 12547 | our judgement | £ 621,639,331 | |
| 12548 | our lifes | £ 176,259,823 | |
| 12549 | Our Lives | £ 60,309,789 | |
| 12550 | our Lord | £ 5,790,277 | |
| 12551 | Our Loved Ones | £ 106,677,737 | |
| 12552 | Our Times | £ 1,742,749 | |
| 12553 | Ours | £ 191,746,347 | |
| 12554 | Ourselves | £ 91,484,866 | |
| 12555 | out | £ 85,981,569 | |
| 12556 | Out of Nothing | £ 1,503,708 | |
| 12557 | Out Of The Blue | £ 946,989,643 | |
| 12558 | Out of town | £ 586,926 | |
| 12559 | Out You Go | £ 39,675,860 | |
| 12560 | outbreak | £ 561,418,136 | |
| 12561 | Outer Haven | £ 1,440,720 | |
| 12562 | Outer Heaven | £ 58,665,319 | |
| 12563 | Outlandish Labs LLC | £ 1,478,185 | |
| 12564 | Outlands | £ 155,639,513 | |
| 12565 | Outlaw | £ 10,047,120 | |
| 12566 | Outletsales | £ 1,793,596 | |
| 12567 | Outrageous Fortune | £ 210,155,594 | |
| 12568 | Outsourcing LLC | £ 4,372,708 | |
| 12569 | Outtathisworld plc | £ 1,236,092 | |
| 12570 | Outworld | £ 75,608,832 | |
| 12571 | Ovation | £ 2,547,061 | |
| 12572 | Over A Pub | £ 97,048,135 | |
| 12573 | Over Priced | £ 73,067,141 | |
| 12574 | overflowing bog | £ 11,871,021 | |
| 12575 | overHelming | £ 491,414,184 | |
| 12576 | Overmeire | £ 5,506,415 | |
| 12577 | Overpoort | £ 2,764,404 | |
| 12578 | Overpovered | £ 1,092,543 | |
| 12579 | Override | £ 17,139,813 | |
| 12580 | OverThor | £ 5,507,873 | |
| 12581 | Overwatch | £ 215,454,246 | |
| 12582 | Overwatch LTD | £ 57,470,387 | |
| 12583 | Ovine Flu | £ 179,073,782 | |
| 12584 | ow3n pte ltd | £ 3,307,504 | |
| 12585 | Owens Enterprise | £ 1,276,577,364 | |
| 12586 | OWLF | £ 2,914,903 | |
| 12587 | Owls | £ 425,596,680 | |
| 12588 | owned | £ 5,486,100 | |
| 12589 | Owned2EU | £ -76,039,189 | |
| 12590 | Owned3EU | £ 2,813,019 | |
| 12591 | Owned4EU | £ -11,748,456 | |
| 12592 | Owner | £ 6,354,110 | |
| 12593 | Owning This Land | £ -869,747 | |
| 12594 | oWoTYRANNYoWo | £ 391,304,428 | |
| 12595 | OWWWW | £ 5,508,284 | |
| 12596 | Oxcide | £ 12,818,579 | |
| 12597 | Oxford | £ 199,487,202 | |
| 12598 | OXO | £ 611,308,678 | |
| 12599 | Oxtail Soup | £ 106,704,755 | |
| 12600 | Oxy Clean | £ 71,691,928 | |
