The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 14001 | Optimum Nutrition | £ -3,018,246 | |
| 14002 | Optimus Inc. | £ -2,482,292 | |
| 14003 | Options | £ 84,494,650 | |
| 14004 | Options Trading | £ 11,040,682 | |
| 14005 | Opus Dei | £ 694,720,428 | |
| 14006 | opus technology | £ 35,372,824 | |
| 14007 | Oracle | £ 5,067,108 | |
| 14008 | Orakos | £ 5,484,841 | |
| 14009 | Orang | £ 46,959,797 | |
| 14010 | Orange | £ 24,725,264 | |
| 14011 | Orange Aftershock | £ 67,681,186 | |
| 14012 | Orange Castle | £ 615,362 | |
| 14013 | Orange Creatine | £ 6,196,167 | |
| 14014 | Orange Inc. | £ 1,716,053 | |
| 14015 | Orange Jelly | £ 6,594,926 | |
| 14016 | Orange Jooze | £ 1,261,621 | |
| 14017 | Orange Jooze 3 | £ 50,000 | |
| 14018 | Orange Jooze2 | £ 795,888 | |
| 14019 | Orange Jooze4 | £ 50,000 | |
| 14020 | Orange Jooze5 | £ 50,000 | |
| 14021 | Orange Juice | £ 23,922,208 | |
| 14022 | Orange Paint | £ 97,288,036 | |
| 14023 | Oranginal | £ 4,103,756 | |
| 14024 | oranje | £ 4,966,784 | |
| 14025 | Orbital | £ 54,539,946 | |
| 14026 | Orbital Bombardment | £ 1,188,671,445 | |
| 14027 | Orbital Mechanics | £ 44,628,548 | |
| 14028 | Orchids R Us Ltd | £ 39,331,588 | |
| 14029 | orcs | £ 2,521,634,731 | |
| 14030 | Orcustra | £ 702,800 | |
| 14031 | Order | £ 176,233,665 | |
| 14032 | Order Flow | £ 121,681,973 | |
| 14033 | Orders | £ 27,738,927 | |
| 14034 | ordinary matter | £ 148,570,111 | |
| 14035 | Oregon | £ 111,775,168 | |
| 14036 | OREO | £ 64,657,012 | |
| 14037 | Org | £ 18,286,924 | |
| 14038 | Organic Beaver | £ 48,683,222 | |
| 14039 | Organics Ltd | £ 105,054,559 | |
| 14040 | Organised Crime | £ 17,216,443 | |
| 14041 | Organized Crime | £ 62,808,878 | |
| 14042 | Orgia Co. | £ 4,887,593 | |
| 14043 | Orgy | £ 5,494,474,757 | |
| 14044 | Origin | £ 967,910,484 | |
| 14045 | Origin yartley | £ 37,041,694 | |
| 14046 | Original 16 | £ 132,618,089 | |
| 14047 | Original Sin | £ 141,442,446 | |
| 14048 | Originality | £ 1,357,128,017 | |
| 14049 | Origins | £ 63,035,912 | |
| 14050 | Orino | £ 56,346,103 | |
| 14051 | Orion | £ 47,648,728 | |
| 14052 | orm | £ 413,783,803 | |
| 14053 | orming | £ 109,142,927 | |
| 14054 | Orome Aldaron | £ 413,207,729 | |
| 14055 | OronzoMafia | £ 5,474,161 | |
| 14056 | Orphans Court | £ 297,981,744 | |
| 14057 | Orphic Co. | £ 4,423,125 | |
| 14058 | Orquinox Co. | £ 1,119 | |
| 14059 | Orricks IT Services | £ 15,082,611 | |
| 14060 | Ortcaj | £ 77,296,813 | |
| 14061 | Orthanc Inc. | £ 147,448,563 | |
| 14062 | Osaka | £ 5,504,057 | |
| 14063 | Osakin | £ 6,161,131 | |
| 14064 | Osbourne | £ 1,744,973 | |
| 14065 | osca-websites | £ 9,181,996 | |
| 14066 | Oscar | £ 2,713,353 | |
| 14067 | Oscar Meyer | £ 5,773,809 | |
| 14068 | Oscorp Industries | £ 179,374 | |
| 14069 | OSHA Six Flags | £ 5,346,082 | |
| 14070 | Osho | £ 4,055,871 | |
| 14071 | Osipolis | £ 16,660,041 | |
| 14072 | Osiris | £ 225,126,101 | |
| 14073 | osiris666 | £ -1,880,407 | |
| 14074 | osiris6971 | £ 10,377,105 | |
| 14075 | Osmosis | £ 41,633,292 | |
| 14076 | Osprey Close | £ 53,590,765 | |
| 14077 | other comps | £ 286,021,008 | |
| 14078 | Other Reality | £ 4,518,202 | |
| 14079 | Otherones | £ 61,853,286 | |
| 14080 | Others | £ 26,039,960 | |
| 14081 | otherwil | £ 133,717 | |
| 14082 | otherwil2 | £ -34,567,223 | |
| 14083 | otherwil3 | £ 1,893,225 | |
| 14084 | otherwil4 | £ 4,826,025 | |
| 14085 | otherwil5 | £ 829,030 | |
| 14086 | Ottawa | £ 44,778,874 | |
| 14087 | Otto | £ 511,521,836 | |
| 14088 | Ottoman Empire | £ 56,887,049 | |
| 14089 | OU812 | £ 295,697,174 | |
| 14090 | OuCh | £ 54,130,309 | |
| 14091 | Ouija Industries | £ 345,812 | |
| 14092 | our butterfly | £ 1,134,896,288 | |
| 14093 | Our Discontent | £ 5,507,855 | |
| 14094 | Our Dollar | £ 177,819,111 | |
| 14095 | Our Doorstep | £ 1,396,159 | |
| 14096 | Our Golden Years | £ 908,659,300 | |
| 14097 | Our Good Name | £ 571,345,968 | |
| 14098 | Our Happy Memories | £ 34,408,558 | |
| 14099 | our judgement | £ 621,639,331 | |
| 14100 | our lifes | £ 464,291,926 | |
