The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 14901 | Onenos | £ 493,377,939 | |
| 14902 | oneone | £ 18,206,569 | |
| 14903 | Oner | £ 10,516,756 | |
| 14904 | OneStopEnvelopeShoppe | £ -38,952 | |
| 14905 | Onioninc | £ -43,613 | |
| 14906 | Onions | £ 56,031,337 | |
| 14907 | ONLINE GAMES | £ 120,242,830 | |
| 14908 | online games. | £ 167,252,652 | |
| 14909 | Only 50k | £ 48,843,249 | |
| 14910 | Only Bombs Allowed | £ 57,741,277 | |
| 14911 | Only Fools and Horses | £ 859,719,219 | |
| 14912 | only me | £ 50,000 | |
| 14913 | only me inc | £ 133,078,068 | |
| 14914 | OnlyDollars | £ 929,042 | |
| 14915 | OnlyMoney | £ 4,556,121 | |
| 14916 | OnlyProfits | £ 5,059,024 | |
| 14917 | OnlyStocks | £ 4,382,795 | |
| 14918 | Onomatopoeias | £ 939,660 | |
| 14919 | Onshore Money | £ 104,918,400 | |
| 14920 | Ontara | £ 79,736,570 | |
| 14921 | Ontario | £ 159,783,223 | |
| 14922 | ontheblock | £ 6,402,837 | |
| 14923 | Onyx | £ 429,592 | |
| 14924 | OO7 | £ 21,310,416 | |
| 14925 | Ooglaigh na Heireann | £ 240,713,877 | |
| 14926 | oohyeaa | £ 50,844,745 | |
| 14927 | Oolacile-01 | £ 3,643,194 | |
| 14928 | oOoOo | £ 44,359,041 | |
| 14929 | oooooo | £ 5,505,528 | |
| 14930 | OOOoooOOO | £ 614,697 | |
| 14931 | oooPPPooo | £ -53,065 | |
| 14932 | oops | £ 965,477 | |
| 14933 | ooz | £ 320,966,832 | |
| 14934 | Opal Opal | £ 5,502,194 | |
| 14935 | Opec | £ 1,574,677,165 | |
| 14936 | Opel Dire | £ 5,505,993 | |
| 14937 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 14938 | Opera House | £ 123,137,933 | |
| 14939 | OPERATION SEALION | £ 10,353,786 | |
| 14940 | OPERATION SEALION 2 | £ 5,504,218 | |
| 14941 | Ophthalmology | £ 45,575,639 | |
| 14942 | Opinion | £ 389,953,431 | |
| 14943 | OPiuM | £ 115,856,941 | |
| 14944 | Oppa Gangnam Style | £ 65,242,420 | |
| 14945 | Oppenheim | £ 51,959,450 | |
| 14946 | Oppenheimer | £ 1,424,302 | |
| 14947 | Oppertunity | £ 512,316,834 | |
| 14948 | Opportunity | £ 11,354,079 | |
| 14949 | Opposition | £ 761,831,311 | |
| 14950 | Oppression | £ 416,055,267 | |
| 14951 | OpRedStripe | £ 39,676,062 | |
| 14952 | optical | £ 491,833,848 | |
| 14953 | optics | £ 57,286,889 | |
| 14954 | Optimal Flames | £ 171,520,458 | |
| 14955 | Optimum Nutrition | £ -3,018,246 | |
| 14956 | Optimus Inc. | £ -2,482,292 | |
| 14957 | Options | £ 84,494,650 | |
| 14958 | Options Trading | £ 15,395,474 | |
| 14959 | Opus Dei | £ 1,591,110,304 | |
| 14960 | opus technology | £ 35,372,824 | |
| 14961 | Oracle | £ 5,067,108 | |
| 14962 | Orakos | £ 9,653,572 | |
| 14963 | Orange | £ 24,725,264 | |
| 14964 | Orange Aftershock | £ 67,681,186 | |
| 14965 | Orange Castle | £ 615,362 | |
| 14966 | Orange County | £ 4,910,507 | |
| 14967 | Orange Creatine | £ 6,196,167 | |
| 14968 | Orange Jelly | £ 6,594,926 | |
| 14969 | Orange Jooze | £ 1,261,621 | |
| 14970 | Orange Jooze 3 | £ 50,000 | |
| 14971 | Orange Jooze2 | £ 795,888 | |
| 14972 | Orange Jooze4 | £ 50,000 | |
| 14973 | Orange Jooze5 | £ 50,000 | |
| 14974 | Orange Paint | £ 97,288,036 | |
| 14975 | Oranginal | £ 4,103,756 | |
| 14976 | oranje | £ 4,966,784 | |
| 14977 | Orbital | £ 54,539,946 | |
| 14978 | Orbital Bombardment | £ 1,279,471,445 | |
| 14979 | Orbital Mechanics | £ 196,325,587 | |
| 14980 | Orchids R Us Ltd | £ 39,331,588 | |
| 14981 | orcs | £ 2,521,634,731 | |
| 14982 | Orcustra | £ 702,800 | |
| 14983 | Order | £ 176,233,665 | |
| 14984 | Order Flow | £ 121,681,973 | |
| 14985 | Orders | £ 27,738,927 | |
| 14986 | ordinary matter | £ 285,537,735 | |
| 14987 | Oregon | £ 111,775,168 | |
| 14988 | OREO | £ 64,657,012 | |
| 14989 | Org | £ 18,286,924 | |
| 14990 | Organic Fruits and Veggy | £ 23,175,728 | |
| 14991 | Organics Ltd | £ 105,054,559 | |
| 14992 | Organised Crime | £ 17,216,443 | |
| 14993 | Organised.net | £ 18,983,533 | |
| 14994 | Organized Crime | £ 62,808,878 | |
| 14995 | Orgia Co. | £ 4,887,593 | |
| 14996 | Orgy | £ 6,092,194,361 | |
| 14997 | Origin | £ 1,277,596,740 | |
| 14998 | Origin yartley | £ 37,041,694 | |
| 14999 | Original 16 | £ 174,342,608 | |
| 15000 | Original Gangster | £ 40,304,076 | |
