The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12301 | Of Time | £ 372,360,923 | |
| 12302 | of. | £ 335,457,109 | |
| 12303 | Ofcom | £ 295,858,780 | |
| 12304 | Off | £ 25,794,080 | |
| 12305 | off it | £ 5,261,275 | |
| 12306 | Offenbach | £ 382,674,581 | |
| 12307 | Offensive Behaviour | £ 493,943,414 | |
| 12308 | office | £ 754,667,738 | |
| 12309 | Offroad Trucker | £ 289,809,909 | |
| 12310 | Offshore | £ 367,643,133 | |
| 12311 | Offshore Accounts | £ 140,823,548 | |
| 12312 | Offshore Cash | £ 60,279,702 | |
| 12313 | og esaelP | £ 4,208,484 | |
| 12314 | ogkush | £ 2,491,394 | |
| 12315 | Ogrimmar | £ 35,379,515 | |
| 12316 | Oh Herro | £ 2,995,837 | |
| 12317 | Oh Jesus Christ | £ 9,142,153 | |
| 12318 | Oh No | £ 157,912,753 | |
| 12319 | Oh YEAH | £ 2,549,726 | |
| 12320 | ohara inc | £ -165,571 | |
| 12321 | ohe herrow | £ 5,703,509 | |
| 12322 | Ohnoitsmymothernlaw | £ 5,504,562 | |
| 12323 | Ohtaku inc | £ 3,600,029 | |
| 12324 | Ohtaku inc1 | £ 4,456,703 | |
| 12325 | Ohtaku inc2 | £ 1,267,353 | |
| 12326 | Ohtaku inc3 | £ 4,191,984 | |
| 12327 | Ohtaku inc4 | £ 4,118,968 | |
| 12328 | ohyesyesh | £ 50,000 | |
| 12329 | Oil | £ 833,968,470 | |
| 12330 | Oil CONGLOMO | £ 2,646,845 | |
| 12331 | Oil Field | £ 271,568 | |
| 12332 | Oil Inc | £ 1,596,655 | |
| 12333 | Oil Industry | £ 4,441,721 | |
| 12334 | Oil Rigger | £ 2,151,587,047 | |
| 12335 | Oilfield Industries | £ 9,854,297 | |
| 12336 | oiu | £ 5,498,037 | |
| 12337 | OJ da Juiceman | £ 109,855 | |
| 12338 | OK Tom | £ 179,436,455 | |
| 12339 | OKFurniture | £ 50,000 | |
| 12340 | OKG Shed | £ -329,334 | |
| 12341 | OKS 1 PTE LTD | £ 50,000 | |
| 12342 | OKS PTE LTD | £ 2,148,676 | |
| 12343 | OLafa | £ 5,088,982 | |
| 12344 | Oland Ltd | £ 50,000 | |
| 12345 | Olay | £ 290,473,960 | |
| 12346 | Old Age | £ 372,141,647 | |
| 12347 | Old Bay | £ 123,534,579 | |
| 12348 | Old Bill | £ 45,792,842 | |
| 12349 | Old Carpet | £ 163,972,008 | |
| 12350 | old farts | £ 3,536,428,093 | |
| 12351 | Old Feuds | £ 44,696,704 | |
| 12352 | Old Granny | £ 9,329,769 | |
| 12353 | old lard | £ -7,521,344 | |
| 12354 | old legends | £ 14,735,844 | |
| 12355 | Old men | £ 397,899,239 | |
| 12356 | Old No. 7 | £ 620,700,257 | |
| 12357 | Old people | £ 41,298,004 | |
| 12358 | Old Rocker | £ 234,028,150 | |
| 12359 | Old School | £ 5,514,041 | |
| 12360 | old skool butta | £ 614,087 | |
| 12361 | Old Smoky | £ 622,122,584 | |
| 12362 | Old Socks | £ 144,379,758 | |
| 12363 | Old Whiskey | £ 17,558,590 | |
| 12364 | Old World Industry | £ 1,734,908 | |
| 12365 | Old World Ventures | £ 50,000 | |
| 12366 | OlDirty | £ 47,991,916 | |
| 12367 | oldschool | £ 50,536,236 | |
| 12368 | Oligarchy | £ 556,860,397 | |
| 12369 | Oligarchy inc. | £ 7,116,723 | |
| 12370 | olis | £ 91,036,818 | |
| 12371 | Oliver Cromwell | £ 220,112,740 | |
| 12372 | Oliver Queen | £ 56,107,912 | |
| 12373 | Olivers Imagination | £ 124,320,555 | |
| 12374 | Olrik | £ 22,147,425 | |
| 12375 | Olympia | £ 112,782,553 | |
| 12376 | olympic rings | £ 3,075,617,171 | |
| 12377 | Olympics | £ 5,508,747 | |
| 12378 | Olympus | £ 2,045,515,336 | |
| 12379 | Omega | £ 6,183,955 | |
| 12380 | Omega Indusries | £ 37,799 | |
| 12381 | OmegaFox Inc. | £ 1,266,634 | |
| 12382 | Omelette | £ 10,061,528 | |
| 12383 | Omerta | £ 1,007,186,123 | |
| 12384 | Omerta Inc. | £ 5,500,096 | |
| 12385 | Omni | £ 26,585,058 | |
| 12386 | Omni Consumer Products | £ -23,968,848 | |
| 12387 | omni4 | £ 1,185,151 | |
| 12388 | Omnia | £ 29,796,207 | |
| 12389 | on a stick | £ 13,410 | |
| 12390 | On all you Candyass | £ 69,045,286 | |
| 12391 | On Industries | £ 1,896,074 | |
| 12392 | On It | £ 59,533,659 | |
| 12393 | On My Mind | £ 87,748,385 | |
| 12394 | On The Fritz | £ 79,242,996 | |
| 12395 | on the road | £ 396,722,546 | |
| 12396 | Once Upon a Time | £ 24,760,937 | |
| 12397 | Once Were Warriors | £ 54,754,263 | |
| 12398 | one | £ 341,379,992 | |
| 12399 | One and a Half | £ 8,610,014,000 | |
| 12400 | One Company | £ 398,709,264 | |
