| Beehive (London) Ltd | Professional & scientific | 2024 |
| Behold the Lamb Ltd | Information & communication | 2010 |
| Beircheart Limited | Real estate | 2014 |
| Belfast Alarms Ltd | Extraterritorial | 1998 |
| Belfast Boys Model Bursary Fund (in Memory of EW Davis) | Education | 2015 |
| Belfast City Confidential Ltd | Information & communication | 2025 |
| Belfast Locks Ltd | Other services | 1996 |
| Belvidere Capital Limited | Construction | 2025 |
| Benchmark Bakery Limited | Hospitality | 2024 |
| Bennett Distribution Limited | Manufacturing | 2012 |
| Bentra Road Management Services Company Ltd | Households | 2005 |
| Bepaperless Ltd | Information & communication | 2024 |
| Berg Allied Ltd | Real estate | 2002 |
| Beyond SET Ltd | Arts & recreation | 2021 |
| Big Black Dog Limited | Information & communication | 2016 |
| Big Tree Property Limited | Real estate | 2023 |
| Bigglescourt Limited | Professional & scientific | 2014 |
| Bigmacs Limited | Hospitality | 2024 |
| Billy and Jean Limited | Construction | 2017 |
| Black Arch Productions Ltd | Information & communication | 2026 |
| Black Arrow Investments Limited | Financial services | 2014 |
| Blackbay Developments Limited | Construction | 2017 |
| Blackcube Capital Limited | Real estate | 2010 |
| Block CPM Limited | Professional & scientific | 2010 |
| Bloomfield Retail Ltd | Wholesale & retail | 2012 |
| Blue Shark Technology Ltd | Information & communication | 2009 |
| Bluewedge Ltd | Manufacturing | 2025 |
| Bobos Property Limited | Real estate | 2024 |
| Bodrum EGE (NI) Limited | Financial services | 2011 |
| Bolt Padel Club Limited | Arts & recreation | 2026 |
| Born Designers Ltd | Manufacturing | 2001 |
| Botham Sports Ltd | Wholesale & retail | 2026 |
| Bouncy Square Ltd | Information & communication | 2023 |
| Boutique Souk Limited | Administrative & support | 2005 |
| Boville-Mcmullan Limited | Real estate | 1965 |
| Boxer Productions Limited | Information & communication | 2003 |
| Bramley Tree Properties Ltd | Real estate | 2023 |
| Brewhouse (Belfast) Limited-The | Hospitality | 1995 |
| BRG Auctions Corporate Limited | Professional & scientific | 2013 |
| BRG Remarketing Corporate Limited | Wholesale & retail | 2013 |
| Brick PMC Ltd | Construction | 2023 |
| Bright Drops Limited | Other services | 2023 |
| Brilliance Group Limited | Financial services | 2019 |
| Broadtree Solutions Limited | Financial services | 2016 |
| Brookstone Group Limited | Real estate | 2020 |
| Broomhill View Property Ltd | Construction | 2004 |
| Browne and Browne Ltd | Real estate | 2025 |
| Browns Brae Management Limited | Households | 2006 |
| Brynawelon Developments Limited | Construction | 2022 |
| Building ME | Other services | 2019 |
| Built for Growth Digital Limited | Information & communication | 2019 |
| Burnside Close Management Co Ltd | Households | 2014 |
| Bushmills Hotels (Holdco) Limited | Professional & scientific | 2007 |
| Bushmills Hotels Limited | Hospitality | 1986 |
| Bushmills Topco Limited | Real estate | 2019 |
| Butter Bean Productions Limited | Information & communication | 2025 |
| BY Bear (NI) Limited | Other services | 2014 |
| BY Real Estate Limited | Real estate | 2023 |
| Byron Court Property Management Ltd | Households | 2014 |
| Bytecentral Solutions Ltd | Information & communication | 2021 |
| C C Residential Limited | Real estate | 2022 |
| C.D.B Consultation Limited | Extraterritorial | 2015 |
| Cadenza Solutions Limited | Information & communication | 2020 |
| Cadre Coffee Limited | Wholesale & retail | 2021 |
| Calahon Ltd | Real estate | 2025 |
| Calawood Ltd | Professional & scientific | 2017 |
| Campbell Mulholland Physiotherapy Limited | Health & social care | 2015 |
| Camphill Community Glencraig | Health & social care | 1968 |
| Camphill Community Holywood | Wholesale & retail | 1996 |
| Candrsellsstuff Ltd | Wholesale & retail | 2026 |
| Cape Interiors Design Ltd | Wholesale & retail | 2010 |
| Capella Holdings Limited | Professional & scientific | 2016 |
| Capella Property Limited | Real estate | 2018 |
| Cariaga Limited | Manufacturing | 2022 |
| Carndale Properties Ltd | Construction | 2020 |
| Carrick 812 Limited | Real estate | 2023 |
| Castledene (NI) Ltd | Real estate | 2012 |
| Castlequarter Coaching Limited | Other services | 2014 |
| Castlewood Management Company Limited | Households | 2018 |
| Cathedral Village Ltd | Hospitality | 2025 |
| Causeway View Limited | Construction | 2025 |
| Cavecourt Limited | Manufacturing | 2005 |
| CB GAS Services Ltd | Construction | 2026 |
| CCA Holywood Limited | Wholesale & retail | 2016 |
| CCL Electrics Ltd | Construction | 2025 |
| Celtic TV and Film Services Limited | Information & communication | 2026 |
| Cernobbio Limited | Other services | 2015 |
| CFRGP1 Shelf Company Limited | Real estate | 2008 |
| CG Industries Ltd | Wholesale & retail | 2025 |
| Chainge Ltd | Professional & scientific | 2024 |
| Chanro Investments Limited | Construction | 2013 |
| Chantry Gardens Management Company Limited | Households | 2017 |
| Chaperones N.I. Limited | Administrative & support | 2017 |
| CHC Ventures Limited | Financial services | 2025 |
| Chelsea Private Clinic Limited | Health & social care | 2013 |
| Chichester ST Holdings Limited | Professional & scientific | 2018 |
| Chichester ST Properties Limited | Real estate | 2015 |
| Chris Hill Limited | Health & social care | 2010 |
| Church Road Developments 2009 Limited | Construction | 2009 |
| Ciara Mclernon Interiors Ltd | Professional & scientific | 2025 |