The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16301 | Oppertunity | £ 512,316,834 | |
| 16302 | Opportunities | £ 58,183,350 | |
| 16303 | Opportunity | £ 11,354,079 | |
| 16304 | Opposition | £ 761,831,311 | |
| 16305 | Oppression | £ 416,055,267 | |
| 16306 | optics | £ 57,286,889 | |
| 16307 | Optimal Flames | £ 175,592,178 | |
| 16308 | Optimum Nutrition | £ -3,018,246 | |
| 16309 | Optimus Inc. | £ -2,482,292 | |
| 16310 | Options | £ 84,494,650 | |
| 16311 | Options Trading | £ 15,395,474 | |
| 16312 | Opus Dei | £ 1,714,492,650 | |
| 16313 | opus technology | £ 35,372,824 | |
| 16314 | Or Fords | £ 45,042,187 | |
| 16315 | Oracle | £ 5,067,108 | |
| 16316 | Orakos | £ 9,653,572 | |
| 16317 | Orange | £ 24,725,264 | |
| 16318 | Orange Aftershock | £ 67,681,186 | |
| 16319 | Orange Castle | £ 615,362 | |
| 16320 | Orange County | £ 4,910,507 | |
| 16321 | Orange Creatine | £ 6,196,167 | |
| 16322 | Orange Jelly | £ 6,594,926 | |
| 16323 | Orange Jooze | £ 1,261,621 | |
| 16324 | Orange Jooze 3 | £ 50,000 | |
| 16325 | Orange Jooze2 | £ 795,888 | |
| 16326 | Orange Jooze4 | £ 50,000 | |
| 16327 | Orange Jooze5 | £ 50,000 | |
| 16328 | Orange Paint | £ 97,288,036 | |
| 16329 | Oranginal | £ 4,103,756 | |
| 16330 | oranje | £ 4,966,784 | |
| 16331 | Orbital | £ 54,539,946 | |
| 16332 | Orbital Bombardment | £ 1,279,471,445 | |
| 16333 | Orbital Mechanics | £ 186,791,295 | |
| 16334 | Orbital Oasis | £ 61,220,273 | |
| 16335 | Orchids R Us Ltd | £ 39,331,588 | |
| 16336 | orcs | £ 2,521,634,731 | |
| 16337 | Orcustra | £ 702,800 | |
| 16338 | Order | £ 176,233,665 | |
| 16339 | Order Flow | £ 121,681,973 | |
| 16340 | Ordinance | £ 12,412,156 | |
| 16341 | ordinary matter | £ 332,072,538 | |
| 16342 | Oregon | £ 111,654,116 | |
| 16343 | OREO | £ 64,657,012 | |
| 16344 | Org | £ 18,286,924 | |
| 16345 | Organic Fruits and Veggy | £ 23,175,728 | |
| 16346 | Organics Ltd | £ 105,054,559 | |
| 16347 | Organised | £ 47,397,852 | |
| 16348 | Organised Crime | £ 17,216,443 | |
| 16349 | Organised.net | £ 55,489,672 | |
| 16350 | Organized Crime | £ 62,808,878 | |
| 16351 | Orgia Co. | £ 4,887,593 | |
| 16352 | Orgy | £ 6,092,194,361 | |
| 16353 | Origin | £ 1,772,357,502 | |
| 16354 | Original 16 | £ 174,342,608 | |
| 16355 | Original Gangster | £ 120,299,845 | |
| 16356 | Original Sin | £ 144,878,801 | |
| 16357 | Original Taste | £ 47,942,688 | |
| 16358 | Original Thoughts | £ 115,584,359 | |
| 16359 | Originality | £ 2,404,207,968 | |
| 16360 | Origins | £ 63,035,912 | |
| 16361 | Orino | £ 56,346,103 | |
| 16362 | Orion | £ 47,648,728 | |
| 16363 | Orion. | £ 374,172,630 | |
| 16364 | Orleans | £ 90,660,211 | |
| 16365 | orm | £ 2,684,322,281 | |
| 16366 | orming | £ 84,475,985 | |
| 16367 | Ornate | £ -8,047,867 | |
| 16368 | Orome Aldaron | £ 1,531,184,473 | |
| 16369 | OronzoMafia | £ 5,474,161 | |
| 16370 | Orphans Court | £ 297,981,744 | |
| 16371 | Orpheus | £ 288,236,792 | |
| 16372 | Orphic Co. | £ 4,423,125 | |
| 16373 | Orquinox Co. | £ 1,119 | |
| 16374 | Orricks IT Services | £ 15,082,611 | |
| 16375 | Ortcaj | £ 77,296,813 | |
| 16376 | Orthanc Inc. | £ 147,448,563 | |
| 16377 | Osaka | £ 5,504,057 | |
| 16378 | Osakin | £ 6,161,131 | |
| 16379 | Osbourne | £ 1,744,973 | |
| 16380 | osca-websites | £ 9,181,996 | |
| 16381 | Oscar Meyer | £ 5,773,809 | |
| 16382 | Oscars Emporium | £ 148,690,217 | |
| 16383 | Oscillation | £ 3,001,978 | |
| 16384 | Oscorp Industries | £ 179,374 | |
| 16385 | OSHA | £ 3,312,937 | |
| 16386 | OSHA Six Flags | £ 5,346,082 | |
| 16387 | Osipolis | £ 16,660,041 | |
| 16388 | Osiris | £ 225,126,101 | |
| 16389 | osiris666 | £ -1,880,407 | |
| 16390 | osiris6971 | £ 50,840,965 | |
| 16391 | Oslo | £ 9,880,014 | |
| 16392 | Osmosis | £ 41,633,292 | |
| 16393 | Osprey Close | £ 53,590,765 | |
| 16394 | Othello | £ 79,511,406 | |
| 16395 | other comps | £ 286,021,008 | |
| 16396 | Other People | £ 14,497,042 | |
| 16397 | Others | £ 26,039,960 | |
| 16398 | Others sometimes | £ 65,359,099 | |
| 16399 | otherwil | £ 133,717 | |
| 16400 | otherwil2 | £ -34,567,223 | |
