| Belfast Academy of Realist Art Limited | Arts & recreation | 2016 |
| Belfast Activity Centre | Arts & recreation | 2010 |
| Belfast Aesthetic Hub Ltd | Other services | 2017 |
| Belfast Airport Taxi Transfers/Pmk Transport Ltd | Transport & logistics | 2024 |
| Belfast and District Motor Club Limited | Arts & recreation | 1931 |
| Belfast Arnott House Centre Limited | Real estate | 2011 |
| Belfast Asian Women's Academy | Health & social care | 2021 |
| Belfast Auctions Ltd | Administrative & support | 2011 |
| Belfast Barbering Academy Limited | Education | 2021 |
| Belfast Bathrooms Ltd | Wholesale & retail | 2024 |
| Belfast Beach Limited | Construction | 2016 |
| Belfast Black Taxi Tours Ltd | Administrative & support | 2023 |
| Belfast Boat Club Limited | Arts & recreation | 2019 |
| Belfast Boiler and Heating Services Ltd | Manufacturing | 2015 |
| Belfast Boiler Services Limited | Construction | 2019 |
| Belfast Bookbinding Ltd | Manufacturing | 2011 |
| Belfast Books 2.0 Limited | Wholesale & retail | 2026 |
| Belfast Books Limited | Wholesale & retail | 2013 |
| Belfast Boucher Market Limited | Wholesale & retail | 2025 |
| Belfast Bounce Ltd | Administrative & support | 2016 |
| Belfast Breakfast Baps Ltd | Hospitality | 2024 |
| Belfast Brunch Co Limited | Hospitality | 2024 |
| Belfast Buildings Trust | Real estate | 1996 |
| Belfast BUS Company Ltd | Transport & logistics | 1998 |
| Belfast Business Consultants Ltd | Professional & scientific | 2021 |
| Belfast Cabs Ltd | Transport & logistics | 2022 |
| Belfast Car Hire Ltd | Administrative & support | 2023 |
| Belfast Cars Ltd | Wholesale & retail | 2026 |
| Belfast Caterers Ltd | Hospitality | 2023 |
| Belfast Cathedral Enterprises Limited | Real estate | 2002 |
| Belfast Celtic Academy Ltd | Arts & recreation | 2019 |
| Belfast Celtic CIC | Arts & recreation | 2019 |
| Belfast Celtic Football and Athletic Club Limited | Arts & recreation | 2024 |
| Belfast Central Business District (BID) Ltd | Other services | 2017 |
| Belfast Central Mission | Health & social care | 2005 |
| Belfast Centre for Arts & Technology | Education | 2024 |
| Belfast Ceramic Studio Ltd | Arts & recreation | 2020 |
| Belfast Ceramic Workshop Ltd | Arts & recreation | 2021 |
| Belfast Chamber of Trade and Commerce Limited | Other services | 2018 |
| Belfast Child C.I.C. | Arts & recreation | 2013 |
| Belfast Children's Allergy Clinic Limited | Health & social care | 2021 |
| Belfast Chip Shops Limited | Hospitality | 2025 |
| Belfast City Airport Watch Limited | Other services | 2008 |
| Belfast City Auctions Limited | Wholesale & retail | 1996 |
| Belfast City Beat Limited | Information & communication | 1989 |
| Belfast City Breaks Ltd | Hospitality | 2023 |
| Belfast City Centre Chaplaincy | Other services | 2019 |
| Belfast City Coaches Ltd | Transport & logistics | 2021 |
| Belfast City Marathon Limited | Arts & recreation | 1982 |
| Belfast City Mission | Administrative & support | 1918 |
| Belfast City of Sanctuary Limited | Education | 2022 |
| Belfast City Shared Accommodation Limited | Hospitality | 2014 |
| Belfast City Sightseeing Limited | Arts & recreation | 2009 |
| Belfast City Vineyard Church | Other services | 2006 |
| Belfast Cleaning Company Ltd | Administrative & support | 2016 |
| Belfast Cleans Limited | Administrative & support | 2024 |
| Belfast Clothing Collections Limited | Wholesale & retail | 2025 |
| Belfast Coach & BUS Company Ltd | Transport & logistics | 2012 |
| Belfast Coach Company Limited | Transport & logistics | 2012 |
| Belfast Cognitive Therapy Centre Ltd | Professional & scientific | 2006 |
| Belfast Collects Ltd | Wholesale & retail | 2025 |
| Belfast Commercial Cleaning Ltd | Administrative & support | 2026 |
| Belfast Commercial Funding (CH1) Limited | Financial services | 2022 |
| Belfast Commercial Funding (CL1) Limited | Financial services | 2021 |
| Belfast Commercial Funding (CM1) Limited | Financial services | 2021 |
| Belfast Commercial Funding (DUN) Limited | Financial services | 2022 |
| Belfast Commercial Funding (ESS1) Limited | Financial services | 2022 |
| Belfast Commercial Funding (FS1) Limited | Financial services | 2021 |
| Belfast Commercial Funding (HR1) Limited | Financial services | 2022 |
| Belfast Commercial Funding (II) Limited | Financial services | 2023 |
| Belfast Commercial Funding (III) Limited | Financial services | 2024 |
| Belfast Commercial Funding (IV) Limited | Financial services | 2025 |
| Belfast Commercial Funding (LR2) Limited | Financial services | 2022 |
| Belfast Commercial Funding (MO1) Limited | Financial services | 2022 |
| Belfast Commercial Funding (O) Limited | Financial services | 2022 |
| Belfast Commercial Funding (RM1) Limited | Financial services | 2022 |
| Belfast Commercial Funding (RP) Limited | Financial services | 2021 |
| Belfast Commercial Funding (V) Limited | Financial services | 2025 |
| Belfast Commercial Funding (VI) Limited | Financial services | 2026 |
| Belfast Commercial Funding Limited | Financial services | 2021 |
| Belfast Community Care Ltd | Health & social care | 2023 |
| Belfast Community Exchange CIC | Education | 2024 |
| Belfast Container Terminal (BCT) Limited | Transport & logistics | 2006 |
| Belfast Contract Cleaners Limited | Administrative & support | 1980 |
| Belfast Cookery School Limited | Hospitality | 2018 |
| Belfast Cottages Ltd | Real estate | 2020 |
| Belfast Craic Ltd | Administrative & support | 2024 |
| Belfast Crystal Limited | Wholesale & retail | 1978 |
| Belfast Culture Club Limited | Information & communication | 2025 |
| Belfast DAB Plus Ltd | Information & communication | 2018 |
| Belfast Darts Co. Ltd | Wholesale & retail | 2026 |
| Belfast Denim Ltd | Wholesale & retail | 2025 |
| Belfast Design Week Ltd | Administrative & support | 2018 |
| Belfast Developments and Investments Limited | Real estate | 2004 |
| Belfast Distillery Company Limited | Wholesale & retail | 2010 |
| Belfast Drug Ltd | Wholesale & retail | 2008 |
| Belfast Eats Ltd | Hospitality | 2025 |
| Belfast Education Training Technical Enterprise Resource Ltd | Education | 2021 |
| Belfast Educational Services (Derry) Holdings Limited | Administrative & support | 2008 |
| Belfast Educational Services (Derry) Limited | Administrative & support | 2008 |