The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 16301 | Once Upon a Time | £ 24,760,937 | |
| 16302 | Once Were Warriors | £ 54,754,263 | |
| 16303 | one | £ 341,379,992 | |
| 16304 | One and a Half | £ 8,610,014,000 | |
| 16305 | One Company | £ 398,709,264 | |
| 16306 | one dollar company | £ 40,885,349 | |
| 16307 | One Enterprise | £ 5,940,523 | |
| 16308 | One Eyed Three Leg Dog | £ 63,605,247 | |
| 16309 | One for the road | £ 4,034,190 | |
| 16310 | One gun | £ 1,381,284,458 | |
| 16311 | One Hit Wonder | £ 30,087,678 | |
| 16312 | One Hundred Netro Bucks | £ 132,828,467 | |
| 16313 | One Insane Rastaman | £ 273,250,880 | |
| 16314 | one love | £ 3,838,898 | |
| 16315 | one man crying | £ 1,050,939,923 | |
| 16316 | One Million | £ 69,025,642 | |
| 16317 | One Mind | £ -5,139,455 | |
| 16318 | one more wont hurt | £ 3,684,439 | |
| 16319 | one of craze | £ 398,067,001 | |
| 16320 | One Piece | £ 11,282,781 | |
| 16321 | One Piece. | £ 40,965,499 | |
| 16322 | One Pound Fish | £ 1,584,921 | |
| 16323 | One Pound Transfers | £ -2,799,952 | |
| 16324 | One Shot | £ 123,851,456 | |
| 16325 | One Silence | £ -4,074 | |
| 16326 | One to Many. | £ 4,976,234 | |
| 16327 | one too many pints | £ 209,606,329 | |
| 16328 | One United | £ 5,379,005 | |
| 16329 | OneHATE | £ 199,508,392 | |
| 16330 | Onenos | £ 215,031,916 | |
| 16331 | oneone | £ 18,206,569 | |
| 16332 | Oner | £ 10,516,756 | |
| 16333 | Onerous | £ 40,516,043 | |
| 16334 | OneStopEnvelopeShoppe | £ -38,952 | |
| 16335 | Onetical | £ 5,502,381 | |
| 16336 | Onioninc | £ -43,613 | |
| 16337 | Onions | £ 56,031,337 | |
| 16338 | ONLINE GAMES | £ 120,242,830 | |
| 16339 | online games. | £ 167,252,652 | |
| 16340 | Only 50k | £ 120,794,156 | |
| 16341 | Only Bombs Allowed | £ 57,741,277 | |
| 16342 | Only Fools and Horses | £ 859,719,219 | |
| 16343 | Only Grans | £ 28,700,532 | |
| 16344 | only me | £ 50,000 | |
| 16345 | only me inc | £ 133,078,068 | |
| 16346 | OnlyDollars | £ 929,042 | |
| 16347 | OnlyMoney | £ 4,556,121 | |
| 16348 | OnlyProfits | £ 5,059,024 | |
| 16349 | OnlyStocks | £ 4,382,795 | |
| 16350 | Onomatopoeias | £ 939,660 | |
| 16351 | Onshore Money | £ 104,918,400 | |
| 16352 | Onslaught | £ 153,042,323 | |
| 16353 | Ontara | £ 79,736,570 | |
| 16354 | Ontario | £ 159,783,223 | |
| 16355 | ontheblock | £ 6,402,837 | |
| 16356 | Onyx | £ 429,592 | |
| 16357 | OO7 | £ 24,682,212 | |
| 16358 | Oodnadatta | £ 2,300,000 | |
| 16359 | Ooglaigh na Heireann | £ 240,713,877 | |
| 16360 | oohyeaa | £ 50,844,745 | |
| 16361 | Oolacile-01 | £ 3,643,194 | |
| 16362 | oOoOo | £ 82,717,145 | |
| 16363 | oooooo | £ 5,505,528 | |
| 16364 | OOOoooOOO | £ 614,697 | |
| 16365 | oooPPPooo | £ -53,065 | |
| 16366 | oops | £ 965,477 | |
| 16367 | ooz | £ 320,966,832 | |
| 16368 | Opal Opal | £ 5,502,194 | |
| 16369 | Opec | £ 1,574,677,165 | |
| 16370 | Opel Dire | £ 5,505,993 | |
| 16371 | Open AI | £ 50,000 | |
| 16372 | OpEn FoR BuIsNeSs | £ 5,785,269 | |
| 16373 | Open Goal | £ 2,425,721 | |
| 16374 | Openhammer | £ 37,958,150 | |
| 16375 | Opera House | £ 123,137,933 | |
| 16376 | operating systems | £ 49,313,057 | |
| 16377 | Operation Centerboard | £ 45,661,943 | |
| 16378 | OPERATION SEALION | £ 10,353,786 | |
| 16379 | OPERATION SEALION 2 | £ 5,504,218 | |
| 16380 | Ophthalmology | £ 45,575,639 | |
| 16381 | Opinion | £ 389,953,431 | |
| 16382 | OPiuM | £ 115,856,941 | |
| 16383 | Oppa Gangnam Style | £ 65,242,420 | |
| 16384 | Oppenheim | £ 51,959,450 | |
| 16385 | Oppenheimer | £ 1,424,302 | |
| 16386 | Oppertunity | £ 512,316,834 | |
| 16387 | Opportunities | £ 58,183,350 | |
| 16388 | Opportunity | £ 11,354,079 | |
| 16389 | Opposition | £ 761,831,311 | |
| 16390 | Oppression | £ 416,055,267 | |
| 16391 | OpRedStripe | £ 39,676,062 | |
| 16392 | optics | £ 57,286,889 | |
| 16393 | Optimal Flames | £ 175,592,178 | |
| 16394 | Optimum Nutrition | £ -3,018,246 | |
| 16395 | Optimus Inc. | £ -2,482,292 | |
| 16396 | Options | £ 84,494,650 | |
| 16397 | Options Trading | £ 15,395,474 | |
| 16398 | Opus Dei | £ 1,615,310,273 | |
| 16399 | opus technology | £ 35,372,824 | |
| 16400 | Or Fords | £ 47,170,410 | |
