| Miketronics Electronic Service | — | 661349 | — | Dissolved | |
| Mikey Tech | — | 717797 | — | Dissolved | |
| Mikey's Handyman Services Ltd. | — | 603484 | — | Dissolved | |
| Mikey's Productions | — | 646728 | — | Dissolved | |
| Mikka carries trucking | — | 715988 | — | Dissolved | |
| Mikmaq Dreams | — | 353519 | — | Dissolved | |
| Mikmaq Management Consultants Inc. | — | 613429 | — | Dissolved | |
| Mikmar Industries | — | 664698 | — | Active | |
| Miko T-Shirts and Caps | — | 756087 | — | Active | |
| Miko Trucking & Construction Inc. | — | 614924 | — | Active | |
| Mil Balloons Decorations and Bouquets | — | 767608 | — | Active | |
| Mila Jean's Family Holdings Ltd. | — | 737171 | — | Active | |
| Mila Realty Inc. | — | 752735 | — | Active | |
| Milan Beauty Medical Aesthetics Clinic Ltd. | — | 760163 | — | Pending | |
| Milan Logistics Inc. | — | 695209 | — | Dissolved | |
| Milano Mediterranean Market | — | 345786 | — | Dissolved | |
| Milano's Pizza & Donair | — | 345604 | — | Dissolved | |
| Milara Accessories Inc. | — | 762703 | — | Active | |
| Milbird Analytics Corp. | — | 768122 | — | Active | |
| Milbridge Media Ltd. | — | 732181 | — | Dissolved | |
| Milbridge Media Solutions | — | 706785 | — | Dissolved | |
| Milburn Holdings Ltd. | — | 661012 | — | Active | |
| Milburn Investments Inc. | — | 661013 | — | Active | |
| Milbury Media | — | 722528 | — | Active | |
| Milco Enterprises Inc. | — | 714804 | — | Merged | |
| Milco Enterprises Inc. | — | 726036 | — | Active | |
| Milco Enterprises Inc. | — | 619481 | — | Merged | |
| Milco Holdings Limited | — | 719048 | — | Active | |
| Milco Investments Inc. | — | 734327 | — | Active | |
| Milco Professionals Inc. | — | 664438 | — | Active | |
| Milco Residential Properties Inc. | — | 658069 | — | Merged | |
| Milco Warehousing and Logistics Inc. | — | 690649 | — | Dissolved | |
| Milda's Pizza & More Inc. | — | 704903 | — | Active | |
| Mile 33 Bistro Pub Inc. | — | 771144 | — | Active | |
| Mile High Travel | — | 716688 | — | Dissolved | |
| Mile Hill Farm | — | 712044 | — | Dissolved | |
| MileBridge Digital Ltd. | — | 706055 | — | Dissolved | |
| Miles 4 Smiles Dental Hygiene services | — | 699546 | — | Pending | |
| Miles Group of Companies | — | 711996 | — | Active | |
| Miles Tattoos | — | 744205 | — | Active | |
| Milestone AV Technologies ULC | — | 664573 | — | Dissolved | |
| Milestone Building & Management | — | 761418 | — | Active | |
| Milestone Condominiums | — | 669605 | — | Dissolved | |
| Milestone Construction | — | 654720 | — | Dissolved | |
| Milestone Construction & Development Inc. | — | 505647 | — | Dissolved | |
| Milestone Event Management | — | 696732 | — | Dissolved | |
| Milestone Foundation Inc. | — | 680374 | — | Active | |
| Milestone Marketing | — | 658193 | — | Dissolved | |
| Milestone Smiles | — | 765099 | — | Active | |
| Milestones Early Learning Centre Inc. | — | 722486 | — | Dissolved | |
| Milford Trailer Park Inc. | — | 615434 | — | Dissolved | |
| Milie Muriel Design | — | 668350 | — | Dissolved | |
| Militant Wire | — | 735971 | — | Active | |
| Military Memory Plates | — | 618818 | — | Dissolved | |
| Military Support Publications | — | 745786 | — | Dissolved | |
| Militaw Training Academy Inc. | — | 754850 | — | Active | |
| Milk & Honey SalonSpa Inc. | — | 654952 | — | Dissolved | |
| Milk Anemone Design | — | 658496 | — | Dissolved | |
| Milk Moovers | — | 625555 | — | Dissolved | |
| Milkish Creek Payroll Management NB | — | 779420 | — | Active | |
| Milkish Oaks Inc. | — | 674712 | — | Dissolved | |
| Milkish Oaks Inc. | — | 649081 | — | Merged | |
| Milkishoaks Holdings Inc. | — | 720160 | — | Active | |
| Milkishoaks Investments Inc. | — | 720164 | — | Active | |
| Milkweed Group Inc. | — | 765923 | — | Active | |
| Mill 2 Enterprises | — | 348533 | — | Dissolved | |
| Mill 2 Enterprises Inc. | — | 604917 | — | Dissolved | |
| Mill Auto Parts | — | 704260 | — | Dissolved | |
| Mill Auto Parts - Pièces d'auto | — | 743969 | — | Active | |
| Mill Brook Engine Repair | — | 612932 | — | Dissolved | |
| Mill Brook Lodge Limited Partnership | — | 683360 | — | Dissolved | |
| Mill Brook Meadows | — | 345229 | — | Dissolved | |
| Mill Cove Coffee Ltd. | — | 681804 | — | Active | |
| Mill Cove Convenience | — | 610169 | — | Dissolved | |
| Mill Cove Nursing Home Foundation Inc. | — | 645024 | — | Active | |
| Mill Creek Automotive Inc. | — | 722536 | — | Dissolved | |
| Mill Creek Brewing | — | 741232 | — | Active | |
| Mill Creek Cabinetry Ltd. | — | 608500 | — | Dissolved | |
| Mill Creek Group Ltd. | — | 608499 | — | Dissolved | |
| Mill Creek Motor Freight L.P. | — | 620298 | — | Dissolved | |
| Mill Creek Woodworking Ltd. | — | 608502 | — | Dissolved | |
| Mill Creek Woodworks Ltd. | — | 608501 | — | Dissolved | |
| Mill Energy Electrical Contracting Ltd. | — | 776258 | — | Active | |
| Mill House Bed & Breakfast | — | 349614 | — | Dissolved | |
| Mill House Investments Limited | — | 711976 | — | Active | |
| Mill Lake Farm Ltd. | — | 757696 | — | Active | |
| Mill Pond Holdings Inc. | — | 606591 | — | Dissolved | |
| Mill Service Enterprises Ltd. | — | 612097 | — | Dissolved | |
| Mill Stone Place | — | 706026 | — | Active | |
| Mill Street Designs | — | 733727 | — | Active | |
| Mill Town Cycle Café Inc. | — | 725863 | — | Active | |
| Mill Town Roasters | — | 708451 | — | Active | |
| Mill-Tek Office Solutions | — | 351140 | — | Dissolved | |
| MillPort Trucking Ltd. | — | 676362 | — | Active | |
| Millan Lumber Inc. | — | 736996 | — | Active | |
| Millar Private | — | 772088 | — | Active | |
| Millar Private Wealth | — | 772089 | — | Active | |
| Millbrook Group Inc. | — | 512041 | — | Dissolved | |
| Millcraft Cabinets Inc. | — | 645788 | — | Active | |
| Millcraft Renovations | — | 744331 | — | Active | |
| Milled Rite Lumber | — | 615618 | — | Dissolved | |
| Millenaire Homes Ltd. | — | 666320 | — | Active | |
| Millenia Farms | — | 348610 | — | Dissolved | |
| Millenium 2000 Bowl | — | 350503 | — | Dissolved | |
| Millenium Auto Body and Collision | — | 603359 | — | Dissolved | |
| Millenium Interactive | — | 346108 | — | Dissolved | |
| Millenium Landscaping | — | 634228 | — | Dissolved | |
| Millenium Nails | — | 619432 | — | Dissolved | |
| Millennia Fresh Leaf Company Ltd. | — | 695683 | — | Dissolved | |
| Millennia Tea | — | 688558 | — | Dissolved | |
| Millennia Tea Incorporated | — | 689595 | — | Active | |
| Millennium Asset Management Group Ltd. | — | 602263 | — | Dissolved | |
| Millennium Bridal Couture & Gowns Ltd. | — | 628586 | — | Dissolved | |
| Millennium Computers Inc. | — | 512199 | — | Dissolved | |
| Millennium Education Inc. | — | 699375 | — | Dissolved | |
| Millennium Fiberglass Inc | — | 644449 | — | Dissolved | |
| Millennium Import LLC | — | 611897 | — | Dissolved | |
| Millennium Local Fine Art | — | 699374 | — | Pending | |
| Millennium Marine | — | 778187 | — | Active | |
| Millennium Marine Inc. | — | 673739 | — | Dissolved | |
| Millennium Marine Inc. | — | 42162 | — | Merged | |
| Millennium Market | — | 666041 | — | Dissolved | |
| Millennium Medical Centre | — | 691328 | — | Active | |
| Millennium Mist | — | 646349 | — | Dissolved | |
| Millennium Mist Sprint Water | — | 350530 | — | Dissolved | |
| Millennium Pool & Leisure | — | 654731 | — | Active | |
| Millennium Signs | — | 676230 | — | Active | |
| Millennium Tire Inc. | — | 511023 | — | Dissolved | |
| Millennium Welding | — | 664975 | — | Active | |
| Miller Building Company Ltd. | — | 751635 | — | Active | |
| Miller Carmichael Properties Inc. Les Immeubles Miller Carmichael Inc. | — | 666808 | — | Active | |
| Miller Custom Cabinets | — | 744129 | — | Dissolved | |
| Miller Custom Cabinets Ltd. | — | 745620 | — | Active | |
| Miller Fabrication and Repair | — | 773564 | — | Active | |
| Miller Gang Fisheries Ltd. | — | 778030 | — | Active | |
| Miller Heating and Cooling Inc. | — | 718833 | — | Active | |
| Miller Heiman Group Canada | — | 698349 | — | Dissolved | |
| Miller Infrastructures Limited | — | 76380 | — | Merged | |
| Miller Kitchens Ltd. | — | 780249 | — | Active | |
| Miller Paving Limited | — | 641493 | — | Merged | |
| Miller Pond Retreat | — | 689677 | — | Active | |
| Miller Rail Surplus Services | — | 617845 | — | Dissolved | |
| Miller Tire Services (N.B.) Limited | — | 509129 | — | Dissolved | |
| Miller's Appliance Centre | — | 346390 | — | Dissolved | |
| Miller's Kettle Corn | — | 710916 | — | Dissolved | |
| Millers Prime Baits Bear Hunting | — | 697583 | — | Dissolved | |
| Millers Prime Baits Bear Hunting | — | 769461 | — | Active | |
| Millerton Recreation Council Inc. | — | 646113 | — | Active | |
| Millertyme Racing Inc. | — | 697400 | — | Active | |
| Millfield Management | — | 656442 | — | Dissolved | |
| Millfield Management Ltd. | — | 659221 | — | Active | |
| Millhouse Properties Inc. | — | 647336 | — | Dissolved | |
| Millican Realty and Forestry Services Ltd. | — | 721900 | — | Active | |
| Millidge Avenue Tot Spot Childcare | — | 600916 | — | Active | |
| Millidge Place Massage Therapy | — | 660928 | — | Dissolved | |
| Millidgeville Contraception and Sexual Health Clinic (CaSH) | — | 678295 | — | Dissolved | |
| Millidgeville Convenience | — | 774036 | — | Active | |
| Millidgeville Family Practice | — | 680202 | — | Pending | |
| Millidgeville Medical Clinic | — | 671450 | — | Active | |
| Millie Haz Your Style | — | 635002 | — | Dissolved | |
| Millie P Photography | — | 681284 | — | Active | |
| Millier's Plumbing | — | 779102 | — | Active | |
| Milligan Holdings | — | 710244 | — | Dissolved | |
| Milligan's Cycle | — | 345006 | — | Dissolved | |
| Milliken Design, Inc. | — | 76716 | — | Active | |
| Million Deliveries Atlantic Inc. | — | 720759 | — | Dissolved | |
| Million Deliveries Inc. | — | 765392 | — | Active | |
| Millionhairs Mobile Salon | — | 652863 | — | Dissolved | |
| Millman Insurance Limited | — | 77691 | — | Dissolved | |
| Millridge Sales & Service Limited | — | 627449 | — | Dissolved | |
| Mills | — | 650927 | — | Active | |
| Mills Aquaculture Inc. | — | 686743 | — | Active | |
| Mills Aquaculture Inc. | — | 508429 | — | Merged | |
| Mills Cormier Window Cleaning and Painting | — | 621709 | — | Dissolved | |
| Mills Engineering & Consulting Inc. | — | 728285 | — | Active | |
| Mills Financial Services | — | 353403 | — | Dissolved | |
| Mills Outdoor Solutions | — | 770895 | — | Active | |
| Mills Paints | — | 650928 | — | Active | |
| Mills Sea Food | — | 688949 | — | Dissolved | |
| Millside Residence - John A. Humphrey House Inc. | — | 632242 | — | Active | |
| Millstone Artist Residence Incorporated | — | 618882 | — | Dissolved | |
| Millstream Accounting Services | — | 716407 | — | Dissolved | |
| Millstream Ag Sales and Repairs | — | 697096 | — | Active | |
| Millstream Construction Inc. | — | 754215 | — | Active | |
| Millstream Dairy Inc. | — | 735327 | — | Active | |
| Millstream Environmental Ltd. | — | 713838 | — | Active | |
| Millstream Heritage Holdings Inc. | — | 771537 | — | Active | |
| Millstream Iron and Metal | — | 667198 | — | Dissolved | |
| Millstream Ventures Inc. | — | 760095 | — | Active | |
| Milltown Properties Inc. | — | 728477 | — | Active | |
| Millville Construction Management Limited | — | 695829 | — | Dissolved | |
| Millville Instruction & Consulting | — | 698851 | — | Active | |
| Millville Nackawic Baptist Church Inc. | — | 655583 | — | Active | |
| Millville Youth Recreation Centre Inc. | — | 25293 | — | Dissolved | |
| Milne Medical Professional Corporation | — | 634161 | — | Active | |
| Milneco | — | 775373 | — | Active | |
| Milner Executive Incorporated | — | 510158 | — | Dissolved | |
| Milner Memorial Gardens Inc. | — | 603721 | — | Active | |
| Milo & Max Entertainment | — | 723422 | — | Pending | |
| Milo Holdings Ltd. | — | 640557 | — | Active | |