The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 15801 | Opec | £ 1,574,677,165 | |
| 15802 | Opel Dire | £ 5,505,993 | |
| 15803 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 15804 | Opera House | £ 123,137,933 | |
| 15805 | Operation Centerboard | £ 45,661,943 | |
| 15806 | OPERATION SEALION | £ 10,353,786 | |
| 15807 | OPERATION SEALION 2 | £ 5,504,218 | |
| 15808 | Ophthalmology | £ 45,575,639 | |
| 15809 | Opinion | £ 389,953,431 | |
| 15810 | OPiuM | £ 115,856,941 | |
| 15811 | Oppa Gangnam Style | £ 65,242,420 | |
| 15812 | Oppenheim | £ 51,959,450 | |
| 15813 | Oppenheimer | £ 1,424,302 | |
| 15814 | Oppertunity | £ 512,316,834 | |
| 15815 | Opportunities | £ 58,183,350 | |
| 15816 | Opportunity | £ 11,354,079 | |
| 15817 | Opposition | £ 761,831,311 | |
| 15818 | Oppression | £ 416,055,267 | |
| 15819 | OpRedStripe | £ 39,676,062 | |
| 15820 | optical | £ 587,008,103 | |
| 15821 | optics | £ 57,286,889 | |
| 15822 | Optimal Flames | £ 175,592,178 | |
| 15823 | Optimum Nutrition | £ -3,018,246 | |
| 15824 | Optimus Inc. | £ -2,482,292 | |
| 15825 | Options | £ 84,494,650 | |
| 15826 | Options Trading | £ 15,395,474 | |
| 15827 | Opus Dei | £ 1,501,110,304 | |
| 15828 | opus technology | £ 35,372,824 | |
| 15829 | Oracle | £ 5,067,108 | |
| 15830 | Orakos | £ 9,653,572 | |
| 15831 | Orange | £ 24,725,264 | |
| 15832 | Orange Aftershock | £ 67,681,186 | |
| 15833 | Orange Castle | £ 615,362 | |
| 15834 | Orange County | £ 4,910,507 | |
| 15835 | Orange Creatine | £ 6,196,167 | |
| 15836 | Orange Jelly | £ 6,594,926 | |
| 15837 | Orange Jooze | £ 1,261,621 | |
| 15838 | Orange Jooze 3 | £ 50,000 | |
| 15839 | Orange Jooze2 | £ 795,888 | |
| 15840 | Orange Jooze4 | £ 50,000 | |
| 15841 | Orange Jooze5 | £ 50,000 | |
| 15842 | Orange Paint | £ 97,288,036 | |
| 15843 | Oranginal | £ 4,103,756 | |
| 15844 | oranje | £ 4,966,784 | |
| 15845 | Orbital | £ 54,539,946 | |
| 15846 | Orbital Bombardment | £ 1,279,471,445 | |
| 15847 | Orbital Mechanics | £ 196,678,544 | |
| 15848 | Orbital Oasis | £ 61,220,273 | |
| 15849 | Orchids R Us Ltd | £ 39,331,588 | |
| 15850 | orcs | £ 2,521,634,731 | |
| 15851 | Orcustra | £ 702,800 | |
| 15852 | Order | £ 176,233,665 | |
| 15853 | Order Flow | £ 121,681,973 | |
| 15854 | Orders | £ 27,738,927 | |
| 15855 | Ordinance | £ 5,944,758 | |
| 15856 | ordinary matter | £ 329,590,879 | |
| 15857 | Oregon | £ 111,775,168 | |
| 15858 | OREO | £ 64,657,012 | |
| 15859 | Org | £ 18,286,924 | |
| 15860 | Organic Fruits and Veggy | £ 23,175,728 | |
| 15861 | Organics Ltd | £ 105,054,559 | |
| 15862 | Organised Crime | £ 17,216,443 | |
| 15863 | Organised.net | £ 55,489,672 | |
| 15864 | Organized Crime | £ 62,808,878 | |
| 15865 | Orgia Co. | £ 4,887,593 | |
| 15866 | Orgy | £ 6,092,194,361 | |
| 15867 | Origin | £ 1,571,596,740 | |
| 15868 | Origin yartley | £ 37,041,694 | |
| 15869 | Original 16 | £ 174,342,608 | |
| 15870 | Original Gangster | £ 32,773,731 | |
| 15871 | Original Sin | £ 144,878,801 | |
| 15872 | Original Taste | £ 46,942,688 | |
| 15873 | Originality | £ 2,404,207,968 | |
| 15874 | Origins | £ 63,035,912 | |
| 15875 | Orino | £ 56,346,103 | |
| 15876 | Orion | £ 47,648,728 | |
| 15877 | Orion. | £ 374,172,630 | |
| 15878 | Orleans | £ 12,681,382 | |
| 15879 | orm | £ 2,684,322,281 | |
| 15880 | orming | £ 79,012,988 | |
| 15881 | Ornamental Knights | £ 3,129,157 | |
| 15882 | Ornate | £ -8,047,867 | |
| 15883 | Orome Aldaron | £ 1,531,184,473 | |
| 15884 | OronzoMafia | £ 5,474,161 | |
| 15885 | Orphans Court | £ 297,981,744 | |
| 15886 | Orpheus | £ 288,236,792 | |
| 15887 | Orphic Co. | £ 4,423,125 | |
| 15888 | Orquinox Co. | £ 1,119 | |
| 15889 | Orricks IT Services | £ 15,082,611 | |
| 15890 | Ortcaj | £ 77,296,813 | |
| 15891 | Orthanc Inc. | £ 147,448,563 | |
| 15892 | Osaka | £ 5,504,057 | |
| 15893 | Osakin | £ 6,161,131 | |
| 15894 | Osbourne | £ 1,744,973 | |
| 15895 | osca-websites | £ 9,181,996 | |
| 15896 | Oscar Meyer | £ 5,773,809 | |
| 15897 | Oscars Emporium | £ 148,690,217 | |
| 15898 | Oscillation | £ 3,001,978 | |
| 15899 | Oscorp Industries | £ 179,374 | |
| 15900 | OSHA Six Flags | £ 5,346,082 | |
