The following list shows all the companies that are in the game.
| Companies List | |||
| Pos. | Company Name | Awards | Total Worth |
| 12301 | Madness Holdings | £ 6,130,507 | |
| 12302 | Madness Inc | £ 71,179,360 | |
| 12303 | MadridCo | £ 63,090,434 | |
| 12304 | Madtax | £ 60,599,818 | |
| 12305 | Maelstrom | £ 74,490 | |
| 12306 | Maes | £ 5,506,699 | |
| 12307 | Maestro Inc | £ 10,020,096 | |
| 12308 | Maestro1 | £ 4,806,635 | |
| 12309 | Maestro3 | £ 50,000 | |
| 12310 | MaFFia | £ 120,981,690 | |
| 12311 | Mafia | £ 1,753,185 | |
| 12312 | Mafia Company | £ 30,978,732 | |
| 12313 | Mafia Enterprises | £ 8,427,838 | |
| 12314 | Mafia Mexicana | £ 535,846,768 | |
| 12315 | mafism | £ 22,493,332 | |
| 12316 | Mag1c | £ 9,025,059 | |
| 12317 | MAGA | £ 149,392,802 | |
| 12318 | Magazine Distributors | £ 37,320,017 | |
| 12319 | Magdalene | £ 1,003,412,911 | |
| 12320 | Magellan of Voyage | £ 5,290,991 | |
| 12321 | Magenta Weed | £ 271,410,952 | |
| 12322 | Maggic7 | £ -443,731 | |
| 12323 | Magic | £ 487,337,098 | |
| 12324 | Magic Carpet | £ 11,874,743 | |
| 12325 | Magic Emporium | £ 103,205,187 | |
| 12326 | Magic Industries | £ -1,643 | |
| 12327 | Magic Mirror | £ 2,172,047 | |
| 12328 | Magic Monkeyz | £ 8,114,425 | |
| 12329 | Magic Mountain | £ 77,051,867 | |
| 12330 | Magic Mushrooms | £ 160,108,013 | |
| 12331 | Magic Pie | £ 490,215,342 | |
| 12332 | Magic Rock Garden | £ 88,058,735 | |
| 12333 | Magic Round About | £ 60,232,415 | |
| 12334 | Magic Roundabout | £ 5,733,823 | |
| 12335 | Magic Tricks | £ 218,328,487 | |
| 12336 | Magic Unicorns | £ 5,507,889 | |
| 12337 | Magician | £ 43,263,578 | |
| 12338 | MagicMan LTD | £ 24,261,637 | |
| 12339 | magics | £ 57,952,497 | |
| 12340 | Magik | £ 8,435,088 | |
| 12341 | Magikarp | £ 54,441,892 | |
| 12342 | magma | £ 256,976,687 | |
| 12343 | Magnag Industries | £ 5,423,817 | |
| 12344 | Magnesia | £ 49,545,385 | |
| 12345 | Magnesium | £ -10,504,907 | |
| 12346 | Magnet and Steel | £ 48,872,761 | |
| 12347 | Magneto | £ 45,020,225 | |
| 12348 | Magneto. | £ 47,023,376 | |
| 12349 | Magnets | £ 58,375,628 | |
| 12350 | Magnolia Properties | £ 5,505,968 | |
| 12351 | Magnum P.I. | £ 4,478,573,315 | |
| 12352 | Magnus Global | £ 79,802,258 | |
| 12353 | MagnusCorp | £ 56,468,260 | |
| 12354 | Magoo | £ 17,276,464 | |
| 12355 | Magoos | £ 35,729,833 | |
| 12356 | Magpie | £ 5,500,937 | |
| 12357 | Magrathea | £ 54,106,264 | |
| 12358 | Mags Estate | £ 5,508,790 | |
| 12359 | Mags Ltd | £ 4,552,528 | |
| 12360 | Mags Summer | £ 5,708,628 | |
| 12361 | Mai Kao Jai | £ 38,479,227 | |
| 12362 | Maicibai | £ 47,404,486 | |
| 12363 | Maid | £ 25,627,043 | |
| 12364 | £ 399,681,500 | ||
| 12365 | Main Force Patrol | £ 32,257,237 | |
| 12366 | Maintenance | £ 256,958,172 | |
| 12367 | major proportions | £ 330,952,609 | |
| 12368 | Major Space Crossroutes | £ 172,811,225 | |
| 12369 | Major Suite | £ 17,697 | |
| 12370 | Makaveli | £ 59,162,119 | |
| 12371 | Makaveli II | £ 44,201,619 | |
| 12372 | Make America Great Again | £ 5,508,261 | |
| 12373 | Make Another Move | £ 225,614,005 | |
| 12374 | Make Gotham Great | £ 134,979,354 | |
| 12375 | make money | £ 4,810,592 | |
| 12376 | Make Netro Great | £ 3,983,342 | |
| 12377 | make this yet | £ 90,110,795 | |
| 12378 | makeofthis | £ 134,245,142 | |
| 12379 | Maker Inc. | £ 2,239,625 | |
| 12380 | Makes Me Feel Fine | £ 64,773,514 | |
| 12381 | Making America Great | £ 164,451,564 | |
| 12382 | Making Pennies | £ 92,844,685 | |
| 12383 | making so many | £ 85,241,085 | |
| 12384 | Mako | £ 10,829,833 | |
| 12385 | Maks a Muckle | £ 938,220,068 | |
| 12386 | Malak.Co | £ -47,512 | |
| 12387 | Malaria | £ 1,959,297 | |
| 12388 | Malawi | £ 178,768,230 | |
| 12389 | Malaysia | £ 59,026,830 | |
| 12390 | MalCo | £ 16,148,870 | |
| 12391 | Malcontent | £ 110,148,082 | |
| 12392 | Malevolence | £ 1,721,245,112 | |
| 12393 | malformed creature | £ 267,031,614 | |
| 12394 | Malice | £ 1,345,288,206 | |
| 12395 | Malicious Intent | £ 55,421,858 | |
| 12396 | Malignant Mutt | £ 55,594,011 | |
| 12397 | Malik Inc. | £ 43,598 | |
| 12398 | Malinois Inc | £ 112,063,766 | |
| 12399 | Malkowitz Industries | £ 303,579,424 | |
| 12400 | Mall | £ 33,937,859 | |
