The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16201 | oooooo | £ 5,505,528 | |
| 16202 | OOOoooOOO | £ 614,697 | |
| 16203 | oooPPPooo | £ -53,065 | |
| 16204 | oops | £ 965,477 | |
| 16205 | ooz | £ 320,966,832 | |
| 16206 | Opal Opal | £ 5,502,194 | |
| 16207 | Opec | £ 1,574,677,165 | |
| 16208 | Opel Dire | £ 5,505,993 | |
| 16209 | Open AI | £ 50,000 | |
| 16210 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 16211 | Open Goal | £ 2,425,721 | |
| 16212 | Openhammer | £ 815,029 | |
| 16213 | Opera House | £ 123,137,933 | |
| 16214 | operating systems | £ 47,719,403 | |
| 16215 | Operation Centerboard | £ 45,661,943 | |
| 16216 | OPERATION SEALION | £ 10,353,786 | |
| 16217 | OPERATION SEALION 2 | £ 5,504,218 | |
| 16218 | Ophthalmology | £ 45,575,639 | |
| 16219 | Opinion | £ 389,953,431 | |
| 16220 | OPiuM | £ 115,856,941 | |
| 16221 | Oppa Gangnam Style | £ 65,242,420 | |
| 16222 | Oppenheim | £ 51,959,450 | |
| 16223 | Oppenheimer | £ 1,424,302 | |
| 16224 | Oppertunity | £ 512,316,834 | |
| 16225 | Opportunities | £ 58,183,350 | |
| 16226 | Opportunity | £ 11,354,079 | |
| 16227 | Opposition | £ 761,831,311 | |
| 16228 | Oppression | £ 416,055,267 | |
| 16229 | OpRedStripe | £ 39,676,062 | |
| 16230 | optical | £ 644,631,234 | |
| 16231 | optics | £ 57,286,889 | |
| 16232 | Optimal Flames | £ 175,592,178 | |
| 16233 | Optimum Nutrition | £ -3,018,246 | |
| 16234 | Optimus Inc. | £ -2,482,292 | |
| 16235 | Options | £ 84,494,650 | |
| 16236 | Options Trading | £ 15,395,474 | |
| 16237 | Opus Dei | £ 1,572,420,138 | |
| 16238 | opus technology | £ 35,372,824 | |
| 16239 | Or Fords | £ 47,249,934 | |
| 16240 | Oracle | £ 5,067,108 | |
| 16241 | Orakos | £ 9,653,572 | |
| 16242 | Orange | £ 24,725,264 | |
| 16243 | Orange Aftershock | £ 67,681,186 | |
| 16244 | Orange Castle | £ 615,362 | |
| 16245 | Orange County | £ 4,910,507 | |
| 16246 | Orange Creatine | £ 6,196,167 | |
| 16247 | Orange Jelly | £ 6,594,926 | |
| 16248 | Orange Jooze | £ 1,261,621 | |
| 16249 | Orange Jooze 3 | £ 50,000 | |
| 16250 | Orange Jooze2 | £ 795,888 | |
| 16251 | Orange Jooze4 | £ 50,000 | |
| 16252 | Orange Jooze5 | £ 50,000 | |
| 16253 | Orange Paint | £ 97,288,036 | |
| 16254 | Oranginal | £ 4,103,756 | |
| 16255 | oranje | £ 4,966,784 | |
| 16256 | Orbital | £ 54,539,946 | |
| 16257 | Orbital Bombardment | £ 1,279,471,445 | |
| 16258 | Orbital Mechanics | £ 169,952,933 | |
| 16259 | Orbital Oasis | £ 61,220,273 | |
| 16260 | Orchids R Us Ltd | £ 39,331,588 | |
| 16261 | orcs | £ 2,521,634,731 | |
| 16262 | Orcustra | £ 702,800 | |
| 16263 | Order | £ 176,233,665 | |
| 16264 | Order Flow | £ 121,681,973 | |
| 16265 | Orders | £ 27,738,927 | |
| 16266 | Ordinance | £ 12,412,156 | |
| 16267 | ordinary matter | £ 325,801,776 | |
| 16268 | Oregon | £ 111,775,168 | |
| 16269 | OREO | £ 64,657,012 | |
| 16270 | Org | £ 18,286,924 | |
| 16271 | Organic Fruits and Veggy | £ 23,175,728 | |
| 16272 | Organics Ltd | £ 105,054,559 | |
| 16273 | Organised Crime | £ 17,216,443 | |
| 16274 | Organised.net | £ 55,489,672 | |
| 16275 | Organized Crime | £ 62,808,878 | |
| 16276 | Orgia Co. | £ 4,887,593 | |
| 16277 | Orgy | £ 6,092,194,361 | |
| 16278 | Origin | £ 1,769,439,775 | |
| 16279 | Origin yartley | £ 37,041,694 | |
| 16280 | Original 16 | £ 174,342,608 | |
| 16281 | Original Gangster | £ 55,433,371 | |
| 16282 | Original Sin | £ 144,878,801 | |
| 16283 | Original Taste | £ 47,942,688 | |
| 16284 | Original Thoughts | £ 52,738,053 | |
| 16285 | Originality | £ 2,404,207,968 | |
| 16286 | Origins | £ 63,035,912 | |
| 16287 | Orino | £ 56,346,103 | |
| 16288 | Orion | £ 47,648,728 | |
| 16289 | Orion. | £ 374,172,630 | |
| 16290 | Orleans | £ 56,160,211 | |
| 16291 | orm | £ 2,684,322,281 | |
| 16292 | orming | £ 78,183,938 | |
| 16293 | Ornamental Knights | £ 3,129,157 | |
| 16294 | Ornate | £ -8,047,867 | |
| 16295 | Orome Aldaron | £ 1,531,184,473 | |
| 16296 | OronzoMafia | £ 5,474,161 | |
| 16297 | Orphans Court | £ 297,981,744 | |
| 16298 | Orpheus | £ 288,236,792 | |
| 16299 | Orphic Co. | £ 4,423,125 | |
| 16300 | Orquinox Co. | £ 1,119 | |
