The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16601 | On the move | £ 144,453,102 | |
| 16602 | on the road | £ 405,722,546 | |
| 16603 | on yourself | £ 126,998,452 | |
| 16604 | Once In A Blue Moon | £ 46,828,771 | |
| 16605 | Once Upon a Time | £ 24,760,937 | |
| 16606 | Once Were Warriors | £ 54,754,263 | |
| 16607 | one | £ 341,379,992 | |
| 16608 | One and a Half | £ 8,610,014,000 | |
| 16609 | One Company | £ 398,709,264 | |
| 16610 | One Company Rule | £ 1,742,256 | |
| 16611 | one dollar company | £ 40,885,349 | |
| 16612 | One Enterprise | £ 5,940,523 | |
| 16613 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16614 | One gun | £ 1,381,284,458 | |
| 16615 | One Hit Wonder | £ 30,087,678 | |
| 16616 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16617 | One Insane Rastaman | £ 273,250,880 | |
| 16618 | one love | £ 3,838,898 | |
| 16619 | one man crying | £ 1,050,939,923 | |
| 16620 | One Million | £ 24,701,799 | |
| 16621 | One Mind | £ -5,139,455 | |
| 16622 | one more wont hurt | £ 50,652,370 | |
| 16623 | one of craze | £ 398,067,001 | |
| 16624 | One Piece | £ 11,282,781 | |
| 16625 | One Piece. | £ 40,965,499 | |
| 16626 | One Pound Fish | £ 1,584,921 | |
| 16627 | One Pound Transfers | £ -2,799,952 | |
| 16628 | One Shot | £ 123,851,456 | |
| 16629 | One Silence | £ -4,074 | |
| 16630 | One to Many. | £ 4,976,234 | |
| 16631 | one too many pints | £ 353,128,608 | |
| 16632 | One United | £ 5,379,005 | |
| 16633 | OneHATE | £ 25,247,345 | |
| 16634 | Onenos | £ 114,278,781 | |
| 16635 | oneone | £ 18,206,569 | |
| 16636 | Oner | £ 10,516,756 | |
| 16637 | Onerous | £ 40,516,043 | |
| 16638 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16639 | Onetical | £ 5,502,381 | |
| 16640 | Onioninc | £ -43,613 | |
| 16641 | Onions | £ 56,031,337 | |
| 16642 | ONLINE GAMES | £ 120,242,830 | |
| 16643 | online games. | £ 167,252,652 | |
| 16644 | Only 50k | £ 120,794,156 | |
| 16645 | Only Bombs Allowed | £ 57,741,277 | |
| 16646 | Only Fools and Horses | £ 859,719,219 | |
| 16647 | Only Grans | £ 77,787,706 | |
| 16648 | only me | £ 50,000 | |
| 16649 | only me inc | £ 133,078,068 | |
| 16650 | OnlyDollars | £ 929,042 | |
| 16651 | OnlyMoney | £ 4,556,121 | |
| 16652 | OnlyProfits | £ 5,059,024 | |
| 16653 | OnlyStocks | £ 4,382,795 | |
| 16654 | Onomatopoeias | £ 939,660 | |
| 16655 | Onshore Money | £ 104,918,400 | |
| 16656 | Onslaught | £ 173,378,826 | |
| 16657 | Ontara | £ 79,736,570 | |
| 16658 | Ontario | £ 159,783,223 | |
| 16659 | ontheblock | £ 6,402,837 | |
| 16660 | Onyx | £ 429,592 | |
| 16661 | OO7 | £ 24,682,212 | |
| 16662 | Oodnadatta | £ 2,300,000 | |
| 16663 | Ooglaigh na Heireann | £ 240,713,877 | |
| 16664 | oohyeaa | £ 50,844,745 | |
| 16665 | Oolacile-01 | £ 3,643,194 | |
| 16666 | oOoOo | £ 82,717,145 | |
| 16667 | oooooo | £ 5,505,528 | |
| 16668 | OOOoooOOO | £ 614,697 | |
| 16669 | oooPPPooo | £ -53,065 | |
| 16670 | oops | £ 965,477 | |
| 16671 | ooz | £ 320,966,832 | |
| 16672 | Opal Opal | £ 5,502,194 | |
| 16673 | Opec | £ 1,574,677,165 | |
| 16674 | Opel Dire | £ 5,505,993 | |
| 16675 | Open AI | £ 50,000 | |
| 16676 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 16677 | Open Goal | £ 2,425,721 | |
| 16678 | Openhammer | £ 44,159,853 | |
| 16679 | Opera House | £ 123,137,933 | |
| 16680 | operating systems | £ 46,095,819 | |
| 16681 | Operation Centerboard | £ 45,661,943 | |
| 16682 | OPERATION SEALION | £ 10,353,786 | |
| 16683 | OPERATION SEALION 2 | £ 5,504,218 | |
| 16684 | Ophthalmology | £ 45,575,639 | |
| 16685 | Opinion | £ 389,953,431 | |
| 16686 | OPiuM | £ 115,856,941 | |
| 16687 | Oppa Gangnam Style | £ 65,242,420 | |
| 16688 | Oppenheim | £ 51,959,450 | |
| 16689 | Oppenheimer | £ 1,424,302 | |
| 16690 | Oppertunity | £ 512,316,834 | |
| 16691 | Opportunities | £ 58,183,350 | |
| 16692 | Opportunity | £ 11,354,079 | |
| 16693 | Opposition | £ 761,831,311 | |
| 16694 | Oppression | £ 416,055,267 | |
| 16695 | OpRedStripe | £ 39,676,062 | |
| 16696 | optics | £ 57,286,889 | |
| 16697 | Optimal Flames | £ 175,592,178 | |
| 16698 | Optimum Nutrition | £ -3,018,246 | |
| 16699 | Optimus Inc. | £ -2,482,292 | |
| 16700 | Options | £ 84,494,650 | |
