| BH Mortgage Solutions Limited | Financial services | 2017 |
| Big Life Adventures Limited | Arts & recreation | 2010 |
| Biospec Feeds Limited | Manufacturing | 2020 |
| Birkdale Court Limited | Households | 1972 |
| Birkett & Co (Holdings) Ltd | Professional & scientific | 2016 |
| Birkett & Co. Ltd | Professional & scientific | 1998 |
| BKQ Limited | Construction | 2002 |
| Black Birch Electrical Ltd | Construction | 2024 |
| Blackmore Park Flats Limited | Households | 1992 |
| Bluechip Financial Ltd | Financial services | 2007 |
| Bodyweight Warrior Ltd | Arts & recreation | 2019 |
| BOREALIS360 Limited | Transport & logistics | 2025 |
| Bournemouth Battery Centre Limited | Wholesale & retail | 2000 |
| BOW Plumbing & Heating Ltd | Construction | 2021 |
| Brendan Carter Homes Ltd | Real estate | 2015 |
| Brendan Developments Ltd | Construction | 2018 |
| Brendan Investments (Poole) Limited | Real estate | 2023 |
| Brennus Ltd | Construction | 2025 |
| Brentford Property Group Ltd | Construction | 2020 |
| Bridge House (Honiton) Limited | Real estate | 1989 |
| Bring ME That Horizon Ltd | Information & communication | 2014 |
| British Tenpin Bowling Association | Extraterritorial | 1974 |
| British Voice Over UK Ltd | Arts & recreation | 2018 |
| Broad Freeze Ltd | Hospitality | 2024 |
| Broadreach Holdings Limited | Financial services | 2024 |
| Broadstone Business Centre Limited | Real estate | 2009 |
| Broadstone Christian Nursery Ltd | Education | 2003 |
| Broadstone Dental Surgery Limited | Health & social care | 2013 |
| Broadstone Investments Limited | Professional & scientific | 2010 |
| Broadstone Medical Limited | Health & social care | 2025 |
| Broadway Bites Limited | Wholesale & retail | 2025 |
| Broadway Property Holdings Ltd | Real estate | 2023 |
| Brockwood Limited | Professional & scientific | 2015 |
| Brookside House (Management) Company Limited | Households | 1988 |
| Bryant & Reeves Limited | Professional & scientific | 2014 |
| Bulgarian Folklore and Educational Centre "Vasil Aprilov" Ltd | Education | 2017 |
| Burden Hire Limited | Administrative & support | 2004 |
| Burnsgas Ltd | Construction | 2019 |
| Burwood Care Limited | Health & social care | 2010 |
| Buyright Car Sales Limited | Wholesale & retail | 2025 |
| Bytesize Consultancy Limited | Information & communication | 2015 |
| C & E Aviation Ltd | Transport & logistics | 2021 |
| C & M Electrical Services Ltd | Construction | 2020 |
| C.C. Sideways Limited | Other services | 2018 |
| Cabot Business Village Management Limited | Real estate | 2000 |
| Cadbury Physiotherapy Ltd | Health & social care | 2019 |
| Caddymat Ltd | Manufacturing | 2023 |
| Camilla House Limited | Hospitality | 2013 |
| Canaan Homes Ltd | Real estate | 2024 |
| Canford Magna Developments Ltd | Construction | 2022 |
| Canford Property Management Limited | Real estate | 2002 |
| Canford Real Estate Ltd | Real estate | 2021 |
| Capital Chefs Recruitment Group Ltd | Extraterritorial | 2023 |
| Care Solutions (Dorset) Limited | Health & social care | 2020 |
| Care Solutions at Home Ltd | Health & social care | 2023 |
| Carlton Developments (Poole) Limited | Construction | 1996 |
| Casa Nord Ltd | Hospitality | 2018 |
| Casajun Ltd | Wholesale & retail | 2022 |
| Case Performance Limited | Financial services | 2016 |
| Castleman Academy Trust | Education | 2014 |
| Castleman Healthcare Limited | Health & social care | 2015 |
| Cautious Finance Limited | Professional & scientific | 2025 |
| Centennial Developments Ltd | Professional & scientific | 2018 |
| Chalfont & Latimer Limited | Professional & scientific | 2007 |
| Chantry Park (Poole) Management Limited | Households | 2019 |
| Charter Technology Limited | Manufacturing | 2011 |
| Chatterton Residents Management Company Ltd | Households | 2020 |
| Cherry Court (2008) Limited | Households | 2008 |
| Chimney Geek Limited | Construction | 2014 |
| Chris Charlton Ltd | Professional & scientific | 2006 |
| Chris Goodwin Design Limited | Professional & scientific | 2020 |
| Church Mews (Bournemouth 2) Ltd | Real estate | 2019 |
| Cindor Vape Limited | Wholesale & retail | 2025 |
| CJM Studio Ltd | Information & communication | 2023 |
| Claddagh Contracts Limited | Construction | 2013 |
| Clarks Holdings (Dorset) Limited | Professional & scientific | 2020 |
| Clean Deep Services Ltd | Administrative & support | 2020 |
| Clearer Approach Limited | Administrative & support | 2018 |
| Cleaves Holdings Ltd | Professional & scientific | 2025 |
| CMW Electrics Ltd | Construction | 2021 |
| Coast IT Ltd | Information & communication | 2019 |
| Coastal Cruises Poole Limited | Transport & logistics | 2024 |
| Coastal Vehicle Solutions Ltd | Wholesale & retail | 2025 |
| Coastline Plumbing and Heating Supplies Ltd | Wholesale & retail | 2022 |
| Cobb Management Ltd | Professional & scientific | 2014 |
| Coburgh Projex Ltd | Construction | 2021 |
| Colehill Investments Ltd | Professional & scientific | 2024 |
| Colette Barratt Limited | Professional & scientific | 2017 |
| Collective Training Specialists Limited | Professional & scientific | 2022 |
| Compound Regulatory Limited | Professional & scientific | 2007 |
| Computer and Design Services Limited | Information & communication | 1974 |
| Contrax Holdings Ltd | Administrative & support | 2017 |
| Contrax Industrial Services Limited | Manufacturing | 2013 |
| Convoke Limited | Information & communication | 2021 |
| Corfe Hills School Academy Trust | Education | 2011 |
| Corfe Mullen Self Storage Ltd | Transport & logistics | 2020 |
| Cosmos Elite Solutions Limited | Information & communication | 2023 |
| Cotton Tent Company (the) Ltd | Wholesale & retail | 2015 |
| Cottonwood Limited | Financial services | 2023 |
| Counselling 4 ALL C.I.C. | Health & social care | 2024 |