| Belmonte Catering Limited | Hospitality | 2021 |
| Benes Musselburgh Ltd | Hospitality | 2025 |
| Best One Musselburgh Limited | Wholesale & retail | 2018 |
| Beven's Furniture Restoration Limited | Other services | 2022 |
| Bijis Kitchen Wallyford Ltd | Hospitality | 2025 |
| Binap Ltd. | Construction | 2006 |
| Black Rabbit Coffee Ltd | Hospitality | 2019 |
| Blackreflect Limited | Information & communication | 2024 |
| Blaikie Property Ltd | Real estate | 2024 |
| Blaze DEV Ltd | Information & communication | 2025 |
| BLO Hair and Beauty Ltd | Other services | 2023 |
| BLO Salon Ltd | Other services | 2017 |
| Bloggy BEE Limited | Information & communication | 2023 |
| Blue Sea Takeaway Ltd | Hospitality | 2023 |
| Blue Sky Care Services Ltd | Health & social care | 2023 |
| Blue Sky Pilates Ltd | Arts & recreation | 2007 |
| Bluecyn Limited | Real estate | 2014 |
| BMB Scotland Ltd | Hospitality | 2023 |
| BNC Autoparts Limited | Wholesale & retail | 2003 |
| BNL Trade Services Ltd | Construction | 2023 |
| Bobbai Ltd | Information & communication | 2024 |
| Bolton Roofing Contractors Ltd | Construction | 2009 |
| BON Law Ltd | Professional & scientific | 2020 |
| Bottitta's Barber Ltd | Other services | 2024 |
| Boujee Bakes Ltd | Manufacturing | 2024 |
| Boxwright Academy Ltd | Arts & recreation | 2025 |
| Brickly Properties Limited | Real estate | 2024 |
| Bridge Investments Partners Limited | Professional & scientific | 2013 |
| Bright Green Business Ltd | Information & communication | 2005 |
| Bright Green Hydrogen Ltd | Professional & scientific | 2006 |
| Brightwaste Ltd | Water & waste | 2017 |
| Brodie Melrose Drysdale & Co. Limited | Manufacturing | 1999 |
| Bronek Ltd | Professional & scientific | 2023 |
| Broomfield IMI Limited | Other services | 2013 |
| Bruce Plumbing and Heating Limited | Construction | 2026 |
| Bthm Properties Limited | Real estate | 2016 |
| BUL BUL Impex Limited | Financial services | 2026 |
| Buoys and Gulls Nursery Limited | Administrative & support | 2009 |
| Burgh Builders Ltd | Construction | 2011 |
| Burgh Home Buyers Ltd | Real estate | 2022 |
| Burghplumb Limited | Construction | 2025 |
| Business Partnership Limited | Administrative & support | 1985 |
| C C Taxis Ltd. | Professional & scientific | 2005 |
| C M H Roofing Ltd | Construction | 2024 |
| C M Macfarlane Ltd | Agriculture & fishing | 2020 |
| C R Metal Recycling Edinburgh Ltd | Other services | 2025 |
| C-Right Through Limited | Hospitality | 2024 |
| C1 Property Investments Limited | Real estate | 2025 |
| C13 Consulting Limited | Administrative & support | 2018 |
| Cabello Hair and Beauty Ltd | Other services | 2013 |
| Cafe 24 Scotland Ltd | Hospitality | 2023 |
| Cafe Renas Ltd. | Hospitality | 2021 |
| Cairn and Clay Bathworks Ltd | Construction | 2025 |
| Cala Cala Limited | Hospitality | 2022 |
| Caledonian Tile Company Limited | Construction | 2015 |
| Calida Property Company Ltd. | Real estate | 2008 |
| Calm Cleaning Service Ltd | Administrative & support | 2024 |
| Calzo Property Limited | Real estate | 2024 |
| Cameron Cottage Creative Community Ltd | Real estate | 2026 |
| Cameron Laidlaw Property Ltd | Real estate | 2026 |
| Cameron Taxis Ltd. | Transport & logistics | 2002 |
| Campbell & Gibson Dental and Implant Practice Limited | Health & social care | 2009 |
| Campbell & Laidlaw Limited | Other services | 2015 |
| Campbell and Hughes Ltd | Other services | 2025 |
| Canireta Limited | Manufacturing | 2023 |
| Canongate Design Limited | Professional & scientific | 2009 |
| Capital Developments (Edinburgh) Limited | Construction | 2022 |
| Capital Plumbing Scotland Ltd | Construction | 2023 |
| Capital Property and Building Maintenance Ltd | Households | 2026 |
| Caprice Restaurant Musselburgh Ltd. | Hospitality | 2018 |
| Caring Together East Lothian Ltd | Households | 2024 |
| Carlo Taranto Ltd | Information & communication | 2025 |
| Carlyle Taxis Ltd. | Other services | 2024 |
| Caroline J a Stevens Ltd | Other services | 2026 |
| Casstax Limited | Professional & scientific | 2006 |
| Catalyst Service Solutions Ltd | Information & communication | 2022 |
| Caughey Enterprises Ltd | Wholesale & retail | 2021 |
| CCE Engineering Services Ltd | Professional & scientific | 2019 |
| Cdastewart UK Ltd | Administrative & support | 2017 |
| CDS Pipeys Ltd | Construction | 2023 |
| Celtic Cross Nursery School Limited | Health & social care | 2002 |
| CFA Archaeology Limited | Professional & scientific | 2000 |
| CGW Private Hire Limited | Transport & logistics | 2006 |
| Champvraie Limited | Real estate | 2021 |
| Changes East Lothian | Health & social care | 2002 |
| Charles Butcher Research & Consultancy Ltd. | Professional & scientific | 2007 |
| Charles Phillips & Sons (of Edinburgh) Limited | Wholesale & retail | 1987 |
| Charles Phillips (Holdings) Limited | Administrative & support | 2004 |
| Charlie Williams Auctioneer Limited | Wholesale & retail | 2003 |
| CJR Engineering Maintenance Ltd | Professional & scientific | 2025 |
| Ckrm Investments Ltd | Real estate | 2023 |
| Clachan Properties Limited | Real estate | 2007 |
| Clarion Capital Limited | Real estate | 2026 |
| Clean UP Services Ltd | Administrative & support | 2021 |
| Cleantec Cleaning Services Limited | Administrative & support | 2017 |
| Cleantec Franchise Limited | Administrative & support | 2021 |
| Cleantec Window Cleaning Limited | Administrative & support | 2026 |
| CLIMATECLAN360 Ltd | Information & communication | 2025 |
| Club Culture Events Ltd | Arts & recreation | 2023 |
| Coad Systems Limited | Information & communication | 2008 |