The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 13901 | One Mind | £ -5,139,455 | |
| 13902 | one of craze | £ 398,067,001 | |
| 13903 | One Piece | £ 11,282,781 | |
| 13904 | One Pound Fish | £ 1,584,921 | |
| 13905 | One Shot | £ 123,851,456 | |
| 13906 | One Silence | £ -4,074 | |
| 13907 | One to Many. | £ 4,976,234 | |
| 13908 | One United | £ 5,379,005 | |
| 13909 | one1 | £ 1,930,995 | |
| 13910 | OneNation | £ 45,456 | |
| 13911 | oneone | £ 18,206,569 | |
| 13912 | Oner | £ 10,516,756 | |
| 13913 | OneStopEnvelopeShoppe | £ -38,952 | |
| 13914 | Onion of Arabia | £ 11,458,256 | |
| 13915 | Onioninc | £ -43,613 | |
| 13916 | Onions | £ 56,031,337 | |
| 13917 | onions inc | £ 46,832,459 | |
| 13918 | ONLINE GAMES | £ 120,242,830 | |
| 13919 | Only Bombs Allowed | £ 57,741,277 | |
| 13920 | Only Fans | £ 387,665,917 | |
| 13921 | Only Fools and Horses | £ 859,719,219 | |
| 13922 | only me | £ 50,000 | |
| 13923 | only me inc | £ 133,078,068 | |
| 13924 | Onomatopoeias | £ 939,660 | |
| 13925 | Onshore Money | £ 104,918,400 | |
| 13926 | Ontara | £ 79,736,570 | |
| 13927 | Ontario | £ 85,260,376 | |
| 13928 | ontheblock | £ 6,402,837 | |
| 13929 | Onyx | £ 429,592 | |
| 13930 | OO7 | £ 11,267,872 | |
| 13931 | Ooglaigh na Heireann | £ 240,713,877 | |
| 13932 | oohyeaa | £ 50,844,745 | |
| 13933 | Oolacile-01 | £ 3,643,194 | |
| 13934 | oOoOo | £ 83,814,525 | |
| 13935 | oooooo | £ 5,505,528 | |
| 13936 | OOOoooOOO | £ 614,697 | |
| 13937 | oooPPPooo | £ -53,065 | |
| 13938 | oops | £ 965,477 | |
| 13939 | ooz | £ 320,966,832 | |
| 13940 | Opal Opal | £ 5,502,194 | |
| 13941 | Opec | £ 273,634,128 | |
| 13942 | Opel Dire | £ 5,505,993 | |
| 13943 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 13944 | Opera House | £ 28,949,936 | |
| 13945 | OPERATION SEALION | £ 10,353,786 | |
| 13946 | OPERATION SEALION 2 | £ 5,504,218 | |
| 13947 | Operations | £ 8,189,228 | |
| 13948 | Ophthalmology | £ 45,575,639 | |
| 13949 | opiates | £ 10,578,986 | |
| 13950 | Opinion | £ 389,953,431 | |
| 13951 | OPiuM | £ 115,856,941 | |
| 13952 | Oppa Gangnam Style | £ 65,242,420 | |
| 13953 | Oppenheim | £ 51,959,450 | |
| 13954 | Oppertunity | £ 512,316,834 | |
| 13955 | Opportunity | £ 11,354,079 | |
| 13956 | Opposition | £ 761,831,311 | |
| 13957 | Oppression | £ 416,055,267 | |
| 13958 | optical | £ 488,270,085 | |
| 13959 | Optimal Flames | £ 172,997,462 | |
| 13960 | Optimum Nutrition | £ -3,018,246 | |
| 13961 | Optimus Inc. | £ -2,482,292 | |
| 13962 | Options | £ 84,494,650 | |
| 13963 | Options Trading | £ 11,040,682 | |
| 13964 | Opus Dei | £ 694,720,428 | |
| 13965 | opus technology | £ 35,372,824 | |
| 13966 | Oracle | £ 5,067,108 | |
| 13967 | Orakos | £ 5,484,841 | |
| 13968 | Orang | £ 46,959,797 | |
| 13969 | Orange | £ 24,725,264 | |
| 13970 | Orange Aftershock | £ 67,681,186 | |
| 13971 | Orange Castle | £ 615,362 | |
| 13972 | Orange Creatine | £ 6,196,167 | |
| 13973 | Orange Inc. | £ 1,716,053 | |
| 13974 | Orange Jelly | £ 6,594,926 | |
| 13975 | Orange Jooze | £ 1,261,621 | |
| 13976 | Orange Jooze 3 | £ 50,000 | |
| 13977 | Orange Jooze2 | £ 795,888 | |
| 13978 | Orange Jooze4 | £ 50,000 | |
| 13979 | Orange Jooze5 | £ 50,000 | |
| 13980 | Orange Juice | £ 23,922,208 | |
| 13981 | Orange Paint | £ 97,288,036 | |
| 13982 | Oranginal | £ 4,103,756 | |
| 13983 | oranje | £ 4,966,784 | |
| 13984 | Orbital | £ 54,539,946 | |
| 13985 | Orbital Bombardment | £ 1,188,671,445 | |
| 13986 | Orbital Mechanics | £ 42,628,896 | |
| 13987 | Orchids R Us Ltd | £ 39,331,588 | |
| 13988 | orcs | £ 2,521,634,731 | |
| 13989 | Orcustra | £ 702,800 | |
| 13990 | Order | £ 176,233,665 | |
| 13991 | Order Flow | £ 121,681,973 | |
| 13992 | Orders | £ 27,738,927 | |
| 13993 | ordinary matter | £ 145,584,069 | |
| 13994 | Oregon | £ 111,775,168 | |
| 13995 | OREO | £ 64,657,012 | |
| 13996 | Org | £ 18,286,924 | |
| 13997 | Organic Beaver | £ 48,683,222 | |
| 13998 | Organics Ltd | £ 105,054,559 | |
| 13999 | Organised Crime | £ 17,216,443 | |
| 14000 | Organized Crime | £ 62,808,878 | |
