The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16101 | Object in Motion | £ 106,865,438 | |
| 16102 | Objective Reality | £ 5,693,910 | |
| 16103 | Obliteration | £ 361,115,028 | |
| 16104 | Obliteration Is Coming | £ 103,722,473 | |
| 16105 | Obliterator | £ 5,501,753 | |
| 16106 | Oblivion | £ 75,985,020 | |
| 16107 | Oblivious | £ 5,503,920 | |
| 16108 | Oblock | £ 30,442,233 | |
| 16109 | Obsession | £ 4,141,059 | |
| 16110 | Obsidian Destroyer | £ 5,567,314 | |
| 16111 | Obsolete | £ 55,457,606 | |
| 16112 | Obtuse | £ 14,379,095 | |
| 16113 | Obviously | £ 2,318,576,665 | |
| 16114 | Ocarina of Time | £ -1,574,201 | |
| 16115 | OCB inc | £ 6,320,804 | |
| 16116 | Occasional Tables | £ 5,328,203 | |
| 16117 | Ocean | £ 52,827,866 | |
| 16118 | Ocean Beach Club | £ 1,083,001,852 | |
| 16119 | Ocean Defence | £ 392,174,285 | |
| 16120 | ocean star | £ 3,580,849,318 | |
| 16121 | Oceanic Enterprises | £ -50,808 | |
| 16122 | Oceans 11 | £ 58,500,636 | |
| 16123 | Oceans 12 | £ 10,291,638 | |
| 16124 | Oceans 13 | £ 132,219,759 | |
| 16125 | Oceans Eleven | £ 8,485,684 | |
| 16126 | Ocelot | £ 194,460,230 | |
| 16127 | Och Noooo | £ 1,506,119 | |
| 16128 | Octavian | £ 4,631,188 | |
| 16129 | October 1066 | £ 81,732,927 | |
| 16130 | October 1854 | £ 290,795,624 | |
| 16131 | October 2014 | £ 94,385,046 | |
| 16132 | Octopia | £ 9,626,521 | |
| 16133 | Octopus Garden | £ 4,050,927 | |
| 16134 | Oddjob | £ 16,604,273 | |
| 16135 | Odds and ends | £ 159,762,055 | |
| 16136 | Odds on Favorite | £ 74,346,727 | |
| 16137 | Oddysay | £ 2,896,867 | |
| 16138 | Odell | £ 13,714,064 | |
| 16139 | Oden | £ 641,394,649 | |
| 16140 | oden wrath | £ 1,735,842,850 | |
| 16141 | odin | £ 8,811,968 | |
| 16142 | Odin Mafia | £ 8,768,668 | |
| 16143 | Odin the Wanderer | £ 4,687,105 | |
| 16144 | Odo | £ 32,513,900 | |
| 16145 | Odqan | £ 183,512,804 | |
| 16146 | Odyssey | £ 329,493,997 | |
| 16147 | of a black widow | £ 196,069,515 | |
| 16148 | Of a Brutal Empire | £ 36,359,377 | |
| 16149 | of a Solar Empire | £ 46,660,163 | |
| 16150 | Of A Time | £ 27,824,181 | |
| 16151 | Of All Your Land | £ 48,121,892 | |
| 16152 | of Belfast | £ 53,511,107 | |
| 16153 | Of Bomb | £ 5,131,350 | |
| 16154 | of CFC | £ 5,455,120 | |
| 16155 | Of Every Position | £ 61,887,884 | |
| 16156 | Of Friday the 13th | £ 50,000 | |
| 16157 | of Impendium | £ 349,441 | |
| 16158 | of Long Stockings | £ 16,738,335 | |
| 16159 | Of My Label | £ 367,377,610 | |
| 16160 | of my secrets | £ 155,200,421 | |
| 16161 | of of | £ 7,075,463 | |
| 16162 | of of of of of of of of | £ 50,000 | |
| 16163 | of REASON | £ 1,154,429 | |
| 16164 | of RHC | £ 68,042,901 | |
| 16165 | Of Scotland | £ 1,304,795,018 | |
| 16166 | Of The Boards | £ 14,794,127 | |
| 16167 | of the devil | £ 27,539,344 | |
| 16168 | of The Hat | £ 5,507,097 | |
| 16169 | of the heap | £ 66,771,581 | |
| 16170 | of the lost | £ 69,257,675 | |
| 16171 | of the monsters | £ 41,126,098 | |
| 16172 | Of The Road | £ 146,979,140 | |
| 16173 | of the runite | £ 4,694,589 | |
| 16174 | Of The UVF | £ 133,321,393 | |
| 16175 | Of the world | £ 2,007,785 | |
| 16176 | of. | £ 335,457,109 | |
| 16177 | Ofcom | £ 306,858,410 | |
| 16178 | Off | £ 25,794,080 | |
| 16179 | Off His Trolly | £ 10,806,044 | |
| 16180 | off it | £ 5,261,275 | |
| 16181 | Offenbach | £ 382,674,581 | |
| 16182 | Offender | £ 108,192,242 | |
| 16183 | Offensive Behaviour | £ 509,861,247 | |
| 16184 | Offensive Security | £ 201,150,445 | |
| 16185 | Official Location | £ 179,832,369 | |
| 16186 | OfflineTV | £ 56,600,622 | |
| 16187 | Offroad Trucker | £ 144,769,125 | |
| 16188 | Offshore Accounts | £ 39,206,670 | |
| 16189 | Offshore Cash | £ 60,279,702 | |
| 16190 | Offshore Trading Company | £ 5,141,246 | |
| 16191 | Ofsted Inspection Regime | £ 61,751,261 | |
| 16192 | og esaelP | £ 4,208,484 | |
| 16193 | ogkush | £ 2,491,394 | |
| 16194 | Ogrimmar | £ 35,379,515 | |
| 16195 | Oh Herro | £ 2,995,837 | |
| 16196 | Oh Jesus Christ | £ 9,142,153 | |
| 16197 | Oh My God | £ 29,183,834 | |
| 16198 | Oh No | £ 206,006,520 | |
| 16199 | Oh YEAH | £ 2,549,726 | |
| 16200 | ohara inc | £ -165,571 | |
