| Drs. Christopher & Jillian Goodyear Professional Corp. | — | 607939 | — | Active | |
| Drs. Clifford and McCormick Professional Corporation | — | 601594 | — | Merged | |
| Drs. Dalrymple & Patel Optometry Professional Corporation | — | 613738 | — | Active | |
| Drs. E. Sadowska and Z. Sadowski Professional Corporation | — | 610356 | — | Active | |
| Drs. Gauthier, Marchand & Mahabir Prof. Corp. | — | 718076 | — | Active | |
| Drs. Joffre & Vicki Munro Professional Corporation | — | 690739 | — | Withdrawn | |
| Drs. Jon and Melanie Leclerc Professional Corporation | — | 703106 | — | Active | |
| Drs. Karen & Allan Rombaut Professional Corporation | — | 508258 | — | Active | |
| Drs. Kyle and Brittany Gillis Professional Corporation | — | 697405 | — | Active | |
| Drs. Losier & Chiasson Corporation Professionnelle Inc. | — | 628891 | — | Active | |
| Drs. M.W. & K.F. Stymiest Professional Corporation | — | 686257 | — | Active | |
| Drs. Maillet & Mangoni P.C. Ltd. | — | 513075 | — | Merged | |
| Drs. Miao Kang Professional Corporation | — | 759435 | — | Active | |
| Drs. Patel & Therien Professional Corporation | — | 743858 | — | Active | |
| Drs. Seyam and Al-Ani P.C. Inc. | — | 742952 | — | Active | |
| Drs. Vinod Nair & Susan Natsheh Professional Corporation | — | 612782 | — | Dissolved | |
| Drs. Violette, Patel & Therien Professional Corporation | — | 668363 | — | Active | |
| Druet Holdings Ltd. | — | 659329 | — | Active | |
| Drugs Influence Children Everyday/Les Drogues Influence Chaque Enfant | — | 346410 | — | Dissolved | |
| Druid Productions | — | 666579 | — | Active | |
| Druid Technologies | — | 610643 | — | Dissolved | |
| Drum Byte Business Computers | — | 653455 | — | Dissolved | |
| Drum Major Mike Phelan of the Black Watch (RHR) Memorial Foundation Ltd. | — | 762074 | — | Active | |
| Drumcannon Limited Partnership | — | 743944 | — | Active | |
| Drummond Built Auto | — | 655521 | — | Active | |
| Drummond Consulting Ltd. | — | 512542 | — | Dissolved | |
| Drummond Regional Soap Box Derby Inc./Course Régionale de Boites à Savon Drummond Inc. | — | 697525 | — | Dissolved | |
| Drunken Designs Woodworks & Co. | — | 701096 | — | Dissolved | |
| Drurys Transfer Ltd. | — | 754601 | — | Active | |
| Dry Flush Canada | — | 744768 | — | Active | |
| Dry Rain & Construction | — | 683075 | — | Dissolved | |
| Dry Tek Solutions | — | 674608 | — | Dissolved | |
| Dry Tek Solutions | — | 719306 | — | Pending | |
| Dry Tek Solutions | — | 664762 | — | Dissolved | |
| Dry-Tek Solutions | — | 621742 | — | Dissolved | |
| DryCat Equipment | — | 709040 | — | Dissolved | |
| DryOil Incorporated | — | 508336 | — | Dissolved | |
| Dryden Electrical & Instrumentation Inc. | — | 753251 | — | Active | |
| Dryden's Down to Earth Lawn Care | — | 346081 | — | Dissolved | |
| Drysdale's Electric | — | 751581 | — | Active | |
| Drysdale's Electric & HVAC Services Inc. | — | 751175 | — | Pending | |
| Dryvit Depot | — | 349827 | — | Dissolved | |
| Dryvit Systems | — | 349828 | — | Dissolved | |
| Dryvit Systems Canada | — | 349829 | — | Dissolved | |
| Drywall Excellence and Construction Inc. | — | 723129 | — | Pending | |
| Drywall Xpert | — | 723298 | — | Active | |
| Drywave Technologies, Inc. | — | 657562 | — | Dissolved | |
| Dsouza, Shah and Group Inc. | — | 721618 | — | Dissolved | |
| Dstudios Management | — | 729221 | — | Active | |
| Dt's small engine repair and more | — | 739611 | — | Active | |
| Du Repos Bed and Breakfast Gite du passant Du Repos | — | 630124 | — | Active | |
| DuBois Chemicals Canada Inc. | — | 640981 | — | Merged | |
| DuParc Capital 2 Inc. | — | 725200 | — | Active | |
| DuParc Capital Inc. | — | 693292 | — | Active | |
| DuParc Real-Estate Management Inc. | — | 721639 | — | Active | |
| DuPlessis Woodlot Partnership | — | 777164 | — | Active | |
| DuPont Real Estate Inc. | — | 769427 | — | Active | |
| Dual Ventures Inc. | — | 618823 | — | Dissolved | |
| Duane Benson Consulting Inc. | — | 617990 | — | Dissolved | |
| Duane M. McAfee Professional Corporation | — | 641952 | — | Active | |
| Duane's Delivery | — | 720285 | — | Pending | |
| Duane's Furniture & Appliances | — | 350223 | — | Dissolved | |
| Duane's Furniture & Appliances | — | 350092 | — | Dissolved | |
| Duart Mull Services | — | 715139 | — | Active | |
| DubC Consulting Inc. | — | 694148 | — | Merged | |
| Dubai Crown Barbershop | — | 777873 | — | Active | |
| Dubba Studio | — | 697281 | — | Dissolved | |
| Dubba Studio | — | 652960 | — | Dissolved | |
| Dube and Son Construction Ltd. | — | 734845 | — | Active | |
| Dubee's Bookkeeping & Income Tax Services Inc. | — | 611832 | — | Dissolved | |
| Dublado-Roque Services Inc. | — | 762306 | — | Active | |
| Dubroy Enterprises Ltd. | — | 691842 | — | Dissolved | |
| Dubé Techno Design | — | 645048 | — | Active | |
| Dubé Towing | — | 668103 | — | Dissolved | |
| Duc Hoo Duchesse Kids Boutique | — | 698698 | — | Dissolved | |
| Duc Luong's Holdings Inc. | — | 695774 | — | Active | |
| Duc Luong's Holdings Inc. | — | 661404 | — | Merged | |
| DucatFlow Inc. | — | 676000 | — | Dissolved | |
| Ducati Canada Inc. | — | 648238 | — | Active | |
| Ducati Financial Services | — | 742983 | — | Active | |
| Ducey & Demmings Construction Inc. | — | 703786 | — | Active | |
| Duchem Innovations | — | 608283 | — | Dissolved | |
| Duck Cove Photography | — | 347166 | — | Dissolved | |
| Duck Duck Bike | — | 662944 | — | Dissolved | |
| Duck Duck Coffee Roasters | — | 734919 | — | Active | |
| Duck Goose Farm | — | 764506 | — | Active | |
| Duck Head Developments Inc. | — | 723397 | — | Active | |
| Duck Pond Enterprises Inc. | — | 774429 | — | Active | |
| Duck personalized gifts | — | 772192 | — | Active | |
| Ducks Are Real Pub Ltd. | — | 752640 | — | Active | |
| Ducks in a Row | — | 633562 | — | Dissolved | |
| Ducks in a Row | — | 696367 | — | Dissolved | |
| Ducks in a Row Corp. | — | 650633 | — | Dissolved | |
| Ducky Developments Ltd. | — | 745381 | — | Active | |
| Ducky's | — | 752920 | — | Active | |
| Ducky's | — | 732061 | — | Dissolved | |
| Duclernier Web Development Studio | — | 687118 | — | Dissolved | |
| Duct & Mist Cleaning Services Inc. | — | 719546 | — | Dissolved | |
| DuctRon Solutions Inc. | — | 771895 | — | Active | |
| Dudeskin North America Inc. | — | 625516 | — | Dissolved | |
| Due Diligence Food and Beverage Consulting | — | 694629 | — | Dissolved | |
| Due North Carpentry & Construction | — | 760349 | — | Dissolved | |
| Dueler's Pizza | — | 603225 | — | Dissolved | |
| Dueling Pianos | — | 605779 | — | Dissolved | |
| Dufden Holdings Inc. | — | 669301 | — | Merged | |
| Dufferin Solar Power Inc. | — | 685309 | — | Active | |
| Dufferin Wind Power Inc. | — | 657593 | — | Active | |
| Duffey's Three Dolphins | — | 350165 | — | Dissolved | |
| Duffney Jewellers | — | 620362 | — | Dissolved | |
| Duffy Construction Ltd | — | 650814 | — | Dissolved | |
| Duffy Water Treatment | — | 737506 | — | Dissolved | |
| Duffy Water Treatment Inc. | — | 752867 | — | Active | |
| Duffy trucking | — | 626859 | — | Active | |
| Duffy's Corner Clothing | — | 617559 | — | Dissolved | |
| Duffy's Custom Cuts | — | 725258 | — | Active | |
| Duffy's Enterprises | — | 625502 | — | Dissolved | |
| Dufour Cedar Products | — | 641170 | — | Dissolved | |
| Dufour Property Services Ltd. | — | 692775 | — | Dissolved | |
| Dufour Small Engine Repair | — | 345610 | — | Dissolved | |
| Dufour's Taxi | — | 660840 | — | Dissolved | |
| Dufourz Designz | — | 695612 | — | Active | |
| Dufresne Retail Solutions Group Inc. | — | 624659 | — | Merged | |
| Dufresne Retail Solutions Group Inc. | — | 700279 | — | Active | |
| Dugas Construction | — | 614041 | — | Dissolved | |
| Dugas et Fils Log Homes | — | 664934 | — | Active | |
| Dugay Investments Ltd. | — | 655071 | — | Active | |
| Duguay F.M. | — | 630074 | — | Dissolved | |
| Duguay Fruit et Legumes | — | 628140 | — | Dissolved | |
| Duguay Gaspereau Inc. | — | 663866 | — | Active | |
| Duguay Guitars | — | 772331 | — | Active | |
| Duguay Holdings Inc. | — | 508038 | — | Dissolved | |
| Duguay Magasin Général | — | 659061 | — | Dissolved | |
| Duguay Management Inc. | — | 642033 | — | Active | |
| Duguay Sawmill | — | 732779 | — | Active | |
| Duguay Services Financiers Inc. | — | 738827 | — | Active | |
| Duguay billiards and games | — | 344678 | — | Dissolved | |
| Duitman Dairy | — | 739126 | — | Active | |
| Duivenvoorden Logging | — | 676478 | — | Active | |
| Duke Energy Canada Holdings Ltd. | — | 515901 | — | Merged | |
| Duke Energy Marketing Canada Corp. | — | 608258 | — | Dissolved | |
| Duke Excavating Inc. | — | 764491 | — | Active | |
| Duke Holdings Inc. | — | 682562 | — | Dissolved | |
| Duke St. Duck Food Mini-Mart | — | 644862 | — | Dissolved | |
| Duke's Byte Sized Solutions | — | 758191 | — | Dissolved | |
| Duke's Enterprises Ltd. | — | 652544 | — | Dissolved | |
| Duke's Trucking Inc. | — | 621210 | — | Active | |
| DulceLocks Services | — | 742071 | — | Active | |
| Dulfin E-Motorcycle | — | 654841 | — | Dissolved | |
| Dulfin E-Motorcycles | — | 644689 | — | Dissolved | |
| Duli Mobile Car Wash | — | 754939 | — | Active | |
| Dulux | — | 650934 | — | Active | |
| Dulux Paints | — | 650940 | — | Active | |
| Dumais Thermo-Clean | — | 769683 | — | Active | |
| Dumais Transport Inc. | — | 614411 | — | Dissolved | |
| Dumais Vegetables-Fruits-Légumes Inc. | — | 698847 | — | Merged | |
| Dumais Vegetables-Fruits-Légumes Inc. | — | 699101 | — | Active | |
| Dumelco Publishing Inc. | — | 629558 | — | Dissolved | |
| Dumfries Maples | — | 722936 | — | Active | |
| Dumfries Woodlot Services | — | 619819 | — | Dissolved | |
| Dumond Boys Trucking | — | 739274 | — | Active | |
| Dump It All | — | 742140 | — | Dissolved | |
| Dump It All Inc. | — | 759723 | — | Active | |
| Dumpster Dude | — | 718713 | — | Dissolved | |
| Dumpsters, Demo & More | — | 757698 | — | Active | |
| Dun & Bradstreet | — | 649431 | — | Dissolved | |
| DunRoamin' Stray and Rescue Inc. | — | 626849 | — | Active | |
| DunSolar | — | 608097 | — | Dissolved | |
| Duna Motor Express Inc. | — | 693871 | — | Active | |
| Dunakin House Publishing | — | 652949 | — | Dissolved | |
| Dunamis Project | — | 730248 | — | Active | |
| Dunbar Falls Cottages | — | 728332 | — | Dissolved | |
| Dunbar Holdings Inc. | — | 744696 | — | Active | |
| Dunbar's Pottery | — | 605813 | — | Dissolved | |
| Dunbar's Pottery | — | 727612 | — | Active | |
| Dunbar's Pottery | — | 614005 | — | Dissolved | |
| Duncan Drugs Ltd. | — | 748677 | — | Active | |
| Duncan Drugs Ltd. | — | 640046 | — | Merged | |
| Duncan Insurance Agencies Ltd. | — | 609515 | — | Dissolved | |
| Duncan L. MacDonald, Chartered Accountant | — | 616426 | — | Dissolved | |
| Duncan L. MacDonald, Chartered Professional Accountant | — | 697947 | — | Active | |
| Duncan Murray Designs | — | 704024 | — | Dissolved | |
| Duncan Robotics | — | 669696 | — | Dissolved | |
| Duncan Solutions Limited Partnership | — | 704300 | — | Active | |
| Duncan's Disc Jockey Service | — | 601464 | — | Dissolved | |
| Duncan's Holdings Inc. | — | 651711 | — | Active | |
| Duncraggan Consulting Inc. | — | 661681 | — | Dissolved | |
| Dundat Contracting | — | 620321 | — | Dissolved | |
| Dundee Capital Markets | — | 657651 | — | Dissolved | |
| Dundee Global Investment Management | — | 685745 | — | Dissolved | |
| Dundee Goodman Gestion Privee | — | 668603 | — | Dissolved | |
| Dundee Goodman Insurance Agency Ltd./Agence d'Assurances Dundee Goodman ltee | — | 661063 | — | Dissolved | |
| Dundee Goodman Peak Portfolios | — | 675394 | — | Dissolved | |
| Dundee Goodman Private Wealth | — | 668143 | — | Dissolved | |
| Dundee Insurance Agency Ltd./Assurances Dundee Ltee | — | 626079 | — | Merged | |
| Dundee Insurance Agency Ltd./Assurances Dundee Ltee | — | 617034 | — | Merged | |
| Dundee Realty Management Inc. | — | 75520 | — | Dissolved | |
| Dundee Securities | — | 351996 | — | Dissolved | |
| Dundee Securities | — | 346502 | — | Dissolved | |
| Dundee Securities Corporation | — | 76652 | — | Merged | |
| Dundee Securities Corporation | — | 77746 | — | Merged | |