The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12301 | Opal Opal | £ 5,502,194 | |
| 12302 | Opec | £ 273,634,128 | |
| 12303 | Opel Dire | £ 5,505,993 | |
| 12304 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 12305 | Operation Racoon City | £ 4,748,173 | |
| 12306 | Operations | £ 8,189,228 | |
| 12307 | Ophthalmology | £ 45,575,639 | |
| 12308 | opiates | £ 10,578,986 | |
| 12309 | Opinion | £ 389,953,431 | |
| 12310 | OPiuM | £ 115,856,941 | |
| 12311 | Oppa Gangnam Style | £ 65,242,420 | |
| 12312 | Oppenheim | £ 51,959,450 | |
| 12313 | Oppertunity | £ 458,210,505 | |
| 12314 | Opportunity | £ 11,354,079 | |
| 12315 | Opposition | £ 761,831,311 | |
| 12316 | Oppression | £ 416,055,267 | |
| 12317 | optical | £ 398,873,238 | |
| 12318 | Optimal Flames | £ 168,931,399 | |
| 12319 | Optimum Nutrition | £ -3,018,246 | |
| 12320 | Optimus Inc. | £ -2,482,292 | |
| 12321 | Options | £ 84,494,650 | |
| 12322 | Opus Dei | £ 694,720,428 | |
| 12323 | opus technology | £ 35,372,824 | |
| 12324 | Oracle | £ 5,067,108 | |
| 12325 | Orange | £ 24,725,264 | |
| 12326 | Orange Aftershock | £ 67,681,186 | |
| 12327 | Orange Castle | £ 615,362 | |
| 12328 | Orange Creatine | £ 6,196,167 | |
| 12329 | Orange Jelly | £ 6,594,926 | |
| 12330 | Orange Jooze | £ 1,261,621 | |
| 12331 | Orange Jooze 3 | £ 50,000 | |
| 12332 | Orange Jooze2 | £ 795,888 | |
| 12333 | Orange Jooze4 | £ 50,000 | |
| 12334 | Orange Jooze5 | £ 50,000 | |
| 12335 | Orange Paint | £ 97,288,036 | |
| 12336 | Oranginal | £ 4,103,756 | |
| 12337 | oranje | £ 4,966,784 | |
| 12338 | Orbital | £ 54,539,946 | |
| 12339 | Orbital Bombardment | £ 664,315,365 | |
| 12340 | Orchids R Us Ltd | £ 39,331,588 | |
| 12341 | orcs | £ 2,516,343,197 | |
| 12342 | Orcustra | £ 702,800 | |
| 12343 | Order | £ 176,233,665 | |
| 12344 | Oregon | £ 111,775,168 | |
| 12345 | OREO | £ 64,657,012 | |
| 12346 | Org | £ 18,286,924 | |
| 12347 | Organic Beaver | £ 33,303,337 | |
| 12348 | Organics Ltd | £ 105,054,559 | |
| 12349 | Organised Crime | £ 17,216,443 | |
| 12350 | Organized Crime | £ 62,808,878 | |
| 12351 | Orgia Co. | £ 4,887,593 | |
| 12352 | Orgy | £ 4,311,652,261 | |
| 12353 | Origin yartley | £ 37,041,694 | |
| 12354 | Original 16 | £ 132,618,089 | |
| 12355 | Original Sin | £ 141,442,446 | |
| 12356 | Originality | £ 1,357,128,017 | |
| 12357 | Origins | £ 63,035,912 | |
| 12358 | Orion | £ 47,648,728 | |
| 12359 | orm | £ 413,783,803 | |
| 12360 | orming | £ 56,130,756 | |
| 12361 | OronzoMafia | £ 560,700 | |
| 12362 | Orphans Court | £ 18,746,350 | |
| 12363 | Orphic Co. | £ 4,423,125 | |
| 12364 | Orquinox Co. | £ 1,119 | |
| 12365 | Orricks IT Services | £ 15,082,611 | |
| 12366 | Ortcaj | £ 77,296,813 | |
| 12367 | Orthanc Inc. | £ 147,448,563 | |
| 12368 | Osaka | £ 5,504,057 | |
| 12369 | Osakin | £ 6,161,131 | |
| 12370 | osca-websites | £ 9,181,996 | |
| 12371 | Oscar Meyer | £ 5,773,809 | |
| 12372 | Oscorp Industries | £ 179,374 | |
| 12373 | Osipolis | £ 16,660,041 | |
| 12374 | Osiris | £ 225,126,101 | |
| 12375 | osiris666 | £ -1,880,407 | |
| 12376 | osiris6971 | £ 10,377,105 | |
| 12377 | Osmosis | £ 36,967,752 | |
| 12378 | Osprey Close | £ 53,590,765 | |
| 12379 | other comps | £ 171,188,256 | |
| 12380 | Otherones | £ 61,853,286 | |
| 12381 | Others | £ 26,039,960 | |
| 12382 | otherwil | £ 133,717 | |
| 12383 | otherwil2 | £ -34,567,223 | |
| 12384 | otherwil3 | £ 1,893,225 | |
| 12385 | otherwil4 | £ 4,826,025 | |
| 12386 | otherwil5 | £ 829,030 | |
| 12387 | Ottawa | £ 44,778,874 | |
| 12388 | Otto | £ 511,521,836 | |
| 12389 | OU812 | £ 295,106,966 | |
| 12390 | Ouija Industries | £ 345,812 | |
| 12391 | our butterfly | £ 1,134,896,288 | |
| 12392 | Our Discontent | £ 5,507,855 | |
| 12393 | Our Dollar | £ 173,827,178 | |
| 12394 | Our Doorstep | £ 1,396,159 | |
| 12395 | Our Golden Years | £ 908,659,300 | |
| 12396 | Our Good Name | £ 571,345,968 | |
| 12397 | Our Happy Memories | £ 34,408,558 | |
| 12398 | our judgement | £ 621,639,331 | |
| 12399 | our lifes | £ 118,941,908 | |
| 12400 | Our Lives | £ 60,309,789 | |
