| Musique Mozus Music Inc. | — | 626956 | — | Dissolved | |
| Musique UB Music Therapy Services - Services thérapeutique | — | 695950 | — | Dissolved | |
| Musique Urbaine / Urban Music | — | 627653 | — | Dissolved | |
| Musique sur mer en Acadie Enr. | — | 670868 | — | Active | |
| Muskawa Holdings Inc. | — | 608947 | — | Dissolved | |
| Musketeer Farm | — | 694864 | — | Active | |
| Muskoka Canoe Works | — | 760266 | — | Active | |
| Musky Transport Enr. | — | 612362 | — | Dissolved | |
| Musky's Holdings Inc. | — | 723438 | — | Active | |
| Muslim Community Centre Saint John Inc. | — | 669310 | — | Dissolved | |
| Must Marketing | — | 766903 | — | Active | |
| Mustangs Senior Football Incorporated | — | 617694 | — | Dissolved | |
| Mustard Seed Art Studio | — | 690809 | — | Dissolved | |
| Mustard Seed Behavioural Consulting | — | 620520 | — | Dissolved | |
| Musée La Forge Jos B. Michaud Inc. | — | 646066 | — | Active | |
| Musée Salle du 150e Inc. | — | 730720 | — | Active | |
| Musée de l'Étoile de Mer Inc. | — | 679190 | — | Dissolved | |
| Musée de la Bière | — | 629891 | — | Dissolved | |
| Musée des Cultures Fondatrices Inc./Founding Cultures Museum Inc. | — | 21979 | — | Active | |
| Musée historique du Madawaska inc. | — | 661326 | — | Dissolved | |
| Mutch Fire Protection Inc. | — | 755948 | — | Active | |
| Mutch's Computer Sales & Service | — | 348966 | — | Dissolved | |
| Muthiah Holdings Inc. | — | 634823 | — | Active | |
| Mutiny Activewear | — | 690327 | — | Dissolved | |
| Mutt Mountain Dog Training | — | 724617 | — | Active | |
| Mutual Fund Dealers Association Of Canada / Association Canadienne Des Courtiers De Fonds Mutuels | — | 745073 | — | Active | |
| Muuke Limited Partnership | — | 699521 | — | Active | |
| Muwin Construction Ltd. | — | 725346 | — | Dissolved | |
| Muwin Made Creations | — | 755622 | — | Active | |
| Muwin's Delivery Service | — | 758723 | — | Active | |
| Muxoid Computer Services | — | 720611 | — | Active | |
| Muzifest Inc. | — | 764574 | — | Active | |
| Muzima Janitor Services | — | 778862 | — | Active | |
| My Backyard Living Inc. | — | 670632 | — | Dissolved | |
| My Beautiful Mesh Candles | — | 728945 | — | Active | |
| My Beauty Photography | — | 681858 | — | Dissolved | |
| My Bike Shop Inc. | — | 690959 | — | Active | |
| My Bike Shop Shediac Rentals and More | — | 701034 | — | Dissolved | |
| My Borders to Yours | — | 732185 | — | Active | |
| My Breezzz Inc. | — | 733570 | — | Dissolved | |
| My Brother's Keeper Ministries | — | 662590 | — | Dissolved | |
| My Canadian Car | — | 352844 | — | Dissolved | |
| My City Life Consignment Inc. | — | 741197 | — | Pending | |
| My Cité Taxi | — | 704764 | — | Dissolved | |
| My Closet Consignment Inc. | — | 696348 | — | Active | |
| My Community Labor Services | — | 700451 | — | Dissolved | |
| My Days Off Auto Detailing and Accessories Ltd. | — | 673146 | — | Active | |
| My Dog's Walker | — | 742200 | — | Active | |
| My DressCode | — | 681017 | — | Dissolved | |
| My Faux Chapeau | — | 664452 | — | Dissolved | |
| My First Productions | — | 709644 | — | Dissolved | |
| My First Productions-Patricia Arquette | — | 711075 | — | Dissolved | |
| My Four Kids Fisheries Inc. | — | 621960 | — | Merged | |
| My Green Scissors Organic Salon | — | 724860 | — | Pending | |
| My Gym Greater Moncton | — | 681589 | — | Dissolved | |
| My HR Partners Consulting Group | — | 745276 | — | Active | |
| My HR Partners Consulting Group | — | 719660 | — | Dissolved | |
| My Health Review Services Inc. | — | 660328 | — | Dissolved | |
| My Home Consignment Inc. | — | 711764 | — | Merged | |
| My Home Consignment Inc. | — | 743096 | — | Active | |
| My Lil' Bee Honey Farm | — | 698985 | — | Active | |
| My Little Fur Baby Pet Supplies | — | 738950 | — | Active | |
| My Little Playhouse Home Daycare | — | 730232 | — | Active | |
| My Little Sunshine Baby Boutique | — | 752681 | — | Dissolved | |
| My Little World Early Learning and Childcare Woodstock | — | 760116 | — | Active | |
| My Mother's Kitchen | — | 607032 | — | Dissolved | |
| My Move Realty | — | 671491 | — | Dissolved | |
| My Move Realty Inc. | — | 671092 | — | Dissolved | |
| My Neighbourhood Marketing Agency | — | 751542 | — | Active | |
| My New Bathroom Inc. | — | 659727 | — | Dissolved | |
| My Own Hero - Motivational Lifestyle Movement | — | 687128 | — | Dissolved | |
| My Own Investment Company Limited | — | 607182 | — | Dissolved | |
| My Own Path, Health and Wellness | — | 715792 | — | Dissolved | |
| My Own Path, Health and Wellness Inc. | — | 719067 | — | Dissolved | |
| My PC Ltd. | — | 614520 | — | Dissolved | |
| My Painted Porch | — | 606854 | — | Active | |
| My Physio p.c. Inc. | — | 679490 | — | Active | |
| My Place Cafe (Somerville) | — | 653195 | — | Dissolved | |
| My Property Tour Inc. | — | 730610 | — | Pending | |
| My Quilt Obsession | — | 776228 | — | Active | |
| My Reason's Seafoods | — | 710905 | — | Dissolved | |
| My Space Giftshop Inc. | — | 714348 | — | Active | |
| My Studio Moncton - Mon Studio Moncton | — | 664557 | — | Dissolved | |
| My Sub Shop | — | 603529 | — | Dissolved | |
| My Super Vacations | — | 629554 | — | Dissolved | |
| My Ton Transport Inc. | — | 763744 | — | Active | |
| My Unique Homes Ltd. | — | 679615 | — | Dissolved | |
| My Vision Optical Lab Ltd. | — | 660333 | — | Dissolved | |
| My Weed Organic Research Inc. | — | 698352 | — | Dissolved | |
| My Wheels Automotive Sales & Restoration Inc. | — | 765306 | — | Active | |
| My Whole Body Herbals | — | 618902 | — | Dissolved | |
| My Whole Life Health and Wellness Coaching | — | 704120 | — | Dissolved | |
| My Work Site | — | 647594 | — | Dissolved | |
| My own 2 hands masonry | — | 757967 | — | Active | |
| MyBellaluxe INC. | — | 733761 | — | Dissolved | |
| MyCoolMasks Embroidery | — | 717132 | — | Dissolved | |
| MyDignity Inc. | — | 652891 | — | Active | |
| MyHandyman Jack | — | 605465 | — | Dissolved | |
| MyIdeal Education Consultancy Agency | — | 728579 | — | Active | |
| MyNP Medical Services Inc. | — | 750384 | — | Active | |
| MyNext Funding Corporation | — | 629766 | — | Dissolved | |
| MyPHR Inc. | — | 680039 | — | Dissolved | |
| MyParts Distributing | — | 674215 | — | Dissolved | |
| MyParts Distributing Ltd. | — | 674298 | — | Active | |
| MyPiercing Jewellery | — | 656017 | — | Dissolved | |
| MyPokerPromo Inc. | — | 620331 | — | Dissolved | |
| MyPropertyTour | — | 716609 | — | Dissolved | |
| MyTots.ca Ltd. | — | 641932 | — | Dissolved | |
| MyTravel | — | 634003 | — | Dissolved | |
| MyTravel Canada Inc. | — | 77894 | — | Merged | |
| MyTravel Canada Inc. | — | 604076 | — | Merged | |
| MyWay Express Inc. | — | 721414 | — | Active | |
| MyWayPrint | — | 674279 | — | Dissolved | |
| MyWorld Retail Services Canada Inc. Services de vente au détail de myWorld Canada inc. | — | 707014 | — | Dissolved | |
| MyZouli Enterprises Inc. | — | 762715 | — | Active | |
| Mycaro Consulting | — | 700312 | — | Dissolved | |
| Mycelia Grove Farm | — | 778009 | — | Active | |
| Myclap Home Services Inc. | — | 766074 | — | Active | |
| Myco-Biome Inc. | — | 736022 | — | Active | |
| Mycodev Group Inc. | — | 672247 | — | Active | |
| Mycroft Design Group | — | 731844 | — | Active | |
| Mydobies Inc. | — | 698412 | — | Active | |
| Myer's Tire Supply (Canada) | — | 643580 | — | Dissolved | |
| Myers Business Services Inc. | — | 617438 | — | Active | |
| Myjayken's Produce and Take Out Ltd. | — | 640921 | — | Dissolved | |
| Myla's Cuisine | — | 679338 | — | Dissolved | |
| Mylene LeBlanc Esthetique | — | 716535 | — | Dissolved | |
| Mylenium Consultants | — | 714545 | — | Active | |
| Myles & Company Inc. | — | 623297 | — | Merged | |
| Myles & Company Inc. | — | 773997 | — | Active | |
| Myles A. MacEachern Professional Corporation | — | 510680 | — | Dissolved | |
| Myles Case Painting | — | 776974 | — | Active | |
| Myles Daniel Coaching & Consulting | — | 751350 | — | Active | |
| Myles Holdings Ltd. | — | 715573 | — | Active | |
| Myles Home Hardware | — | 732176 | — | Active | |
| Myles Realty Management Inc. | — | 772972 | — | Merged | |
| Myles Realty Management Inc. | — | 679046 | — | Dissolved | |
| Myles Sullivan Trucking Inc. | — | 684662 | — | Dissolved | |
| Myles-Gerrish Financial Group Inc. | — | 625588 | — | Active | |
| Mymark | — | 664831 | — | Dissolved | |
| Mynewcontractor.ca | — | 659243 | — | Dissolved | |
| Myo Hygie Massothérapie | — | 696678 | — | Active | |
| MyoFlex, Massage & Hydrotherapy Clinic | — | 349302 | — | Dissolved | |
| MyoKinesis Massage Therapy Clinic | — | 638208 | — | Dissolved | |
| MyoKinesis Massage Therapy Clinic Inc. | — | 644798 | — | Active | |
| MyoWellness Therapeutic Massage | — | 679070 | — | Dissolved | |
| MyoWellness Therapeutic Massage | — | 659430 | — | Dissolved | |
| Myoflex Massage & Rejuvenation Clinic | — | 672054 | — | Dissolved | |
| Myoflex Massage & Rejuvenation Clinic | — | 671934 | — | Dissolved | |
| Myomo Group Inc. | — | 719315 | — | Active | |
| Myotech International, Corp. | — | 658709 | — | Dissolved | |
| Myotech Sports Therapy Inc. | — | 627799 | — | Dissolved | |
| Myrage Springs | — | 607135 | — | Dissolved | |
| Myriad Advantage Corporation | — | 626628 | — | Dissolved | |
| Myriad Leasing | — | 626629 | — | Dissolved | |
| Myriad Ventures Inc. | — | 745958 | — | Active | |
| Myriam Gaudet Design | — | 727434 | — | Active | |
| Myrna's Cleaning Services | — | 673729 | — | Dissolved | |
| Myronyk Drywall Inc. | — | 771393 | — | Active | |
| Myrtha Properties Ltd. | — | 713726 | — | Dissolved | |
| Myrtle Primrose Encouragement Studio | — | 747203 | — | Active | |
| Myrtle's Pizza | — | 709914 | — | Dissolved | |
| Mysand Holdings Ltd. | — | 707102 | — | Dissolved | |
| Myster's Pub | — | 600938 | — | Dissolved | |
| Mysterious Ways Inc. | — | 607947 | — | Dissolved | |
| Mystery Creature Animation Inc. | — | 649707 | — | Dissolved | |
| Mystery Guild Network Inc. | — | 771235 | — | Active | |
| Mystery Lake Condominium Association Inc. | — | 601888 | — | Dissolved | |
| Mystery Lake Manor Incorporated | — | 639585 | — | Dissolved | |
| Mystery Moncton Escape Rooms | — | 687230 | — | Dissolved | |
| Mystery Moncton Escape Rooms | — | 686571 | — | Dissolved | |
| Mystery Moncton Escape Rooms | — | 686192 | — | Dissolved | |
| Mystery Moncton Escape Rooms Inc. | — | 688052 | — | Active | |
| Mystery Pearls | — | 750794 | — | Active | |
| Mystic Guides | — | 611298 | — | Dissolved | |
| Mystic Ice Springs | — | 605166 | — | Dissolved | |
| Mystic Ice Springs | — | 637589 | — | Dissolved | |
| Mystic Lash Lounge By Crown | — | 727288 | — | Dissolved | |
| Mystic Lash Lounge by Crown | — | 775936 | — | Active | |
| Mystic Materials Sewing and Design | — | 718205 | — | Dissolved | |
| Mystic Moons Books & Brews | — | 726565 | — | Pending | |
| Mystic Sea Brewing | — | 747415 | — | Active | |
| Mystic Sunset Productions II | — | 667931 | — | Dissolved | |
| Mystical Angel Healing | — | 677678 | — | Dissolved | |
| Mystical Horizons Tarot Readings | — | 693575 | — | Dissolved | |
| Mysticocat Creations Studio | — | 777521 | — | Active | |
| Mystik Creations Mystik Ltée | — | 514733 | — | Dissolved | |
| Mystik Creations Nail Fashions and Aesthetics | — | 620480 | — | Dissolved | |
| Mystique Hair Studios | — | 662464 | — | Active | |
| Mystique Investment Holdings Inc. | — | 722476 | — | Active | |
| Mystique Ventures Inc. | — | 618104 | — | Active | |
| Mystyrock | — | 635665 | — | Dissolved | |
| Myth Threads Studio | — | 351684 | — | Dissolved | |
| MythMedia Graphic Services | — | 635062 | — | Dissolved | |
| Mythics Canada Inc. | — | 622182 | — | Dissolved | |
| Mythril Systems Inc. | — | 757583 | — | Active | |
| MÉDIC PLUS INDUSTRIAL INC. | — | 624596 | — | Active | |
| MÉGA GESTION LTÉE | — | 13060 | — | Merged | |
| MÉGABEILLES INC. | — | 729019 | — | Active | |
| MÉLANIE MICHAUD C.P. Inc. | — | 748940 | — | Active | |