| 1/3 Farm Drive 11/12 Thorley Close Management Company Limited | Households | 2003 |
| 818 Industries Ltd | Information & communication | 2024 |
| A and L Theatre Company Ltd | Administrative & support | 2025 |
| A&L Brickwork and Labour Ltd | Construction | 2025 |
| A&L Heating and Plumbing Ltd | Construction | 2024 |
| Aber Wrought Iron Limited | Manufacturing | 2005 |
| Abernant Kebab Limited | Hospitality | 2019 |
| ABP Mortgages Limited | Financial services | 2015 |
| Absolute Fusion Ltd | Water & waste | 2021 |
| Adrian Davies Kitchen Fitting Ltd | Construction | 2019 |
| AG Financial Solutions Ltd | Financial services | 2026 |
| Ajob Construction Ltd | Construction | 2026 |
| Alan Price and Sons (Bargoed) Limited | Transport & logistics | 1973 |
| Amber's Adventure Paws Ltd | Agriculture & fishing | 2025 |
| Andrew Good Construction Services Ltd | Construction | 2017 |
| ASG Property Solutions Ltd | Real estate | 2025 |
| Asgardian Properties Ltd | Real estate | 2026 |
| Aslan Bookkeeping & Accounting Ltd | Professional & scientific | 2021 |
| Astalon Limited | | 2013 |
| Atms Engineering, Management & Consultancy Services Limited | Professional & scientific | 2019 |
| Atms Properties Ltd | Real estate | 2019 |
| Aztec Holdings Rhymney Ltd | Construction | 2026 |
| Baileys Plastering & Rendering Ltd | Construction | 2026 |
| Bargoed Chippy Ltd | Hospitality | 2024 |
| Bargoed Chiropractic Clinic Ltd | Other services | 2013 |
| Bargoed Fish Ltd | Hospitality | 2019 |
| Bargoed Fried Chicken Limited | Hospitality | 2023 |
| Bargoed Kebab Ltd | Hospitality | 2019 |
| Bargoed Mobile Zone Ltd | Wholesale & retail | 2021 |
| Bargoed Nursery Ltd | Health & social care | 2022 |
| Bargoed Service Station Limited | Wholesale & retail | 2012 |
| Bargoed Wellbeing Community Interest Company | Health & social care | 2024 |
| Beam Engineering Ltd | Construction | 2025 |
| Bitework K9 Ltd | Other services | 2018 |
| BKJ Properties Ltd | Real estate | 2016 |
| BKL Roofing Ltd | Construction | 2018 |
| Blue Liners Ltd | Hospitality | 2020 |
| Blue ROW Storage Ltd | Transport & logistics | 2025 |
| Blue Yonder Investments Limited | Transport & logistics | 2011 |
| BMC Express Ltd | Wholesale & retail | 2024 |
| Bourton's Live Music Café Bar Limited | Hospitality | 2022 |
| Bourton's Music School Limited | Education | 2017 |
| Bova Property Services Ltd | Real estate | 2025 |
| Boxon Foods Ltd | Hospitality | 2020 |
| Bradfords Travel Limited | Transport & logistics | 2008 |
| Branch Energy Limited | Manufacturing | 2016 |
| Branch Homes Limited | Real estate | 2020 |
| Brimad Limited | Construction | 2014 |
| Bromac Civil Engineering Limited | Construction | 2011 |
| Bryn Traffic Management Limited | Construction | 2017 |
| Bugler's Properties Limited | Real estate | 2022 |
| Busy Feet (Gilfach) Ltd. | Education | 2015 |
| Butters Sports Bar Limited | Hospitality | 2025 |
| BY Olives Tree Ltd | Hospitality | 2025 |
| C Davies Transport Ltd | Transport & logistics | 2025 |
| C.L.I. Contractors Limited | Hospitality | 1985 |
| Caico Services Ltd | Construction | 2020 |
| Capital Creation Ltd | Wholesale & retail | 2017 |
| Cappa Food Ltd | Hospitality | 2026 |
| Cardiff Plumbing and Heating Limited | Construction | 2025 |
| Carney & Co @Powercut Limited | Other services | 2025 |
| Celtic Car Sales & Recoveries Ltd | Wholesale & retail | 2025 |
| Chimp Rentals Ltd | Real estate | 2026 |
| Cinescope Pictures Ltd | Information & communication | 2026 |
| Cirrus Build Limited | Construction | 2022 |
| Citizens Advice Caerphilly Blaenau Gwent | Health & social care | 2000 |
| Citizens Advice South East Wales Ltd | Health & social care | 2022 |
| Civilworks Solutions Ltd | Construction | 2024 |
| Club Lenox Limited | Hospitality | 2012 |
| Colour My World Ltd | Construction | 2022 |
| Coombs Contractors Ltd | Construction | 2015 |
| Coombs Fencing and Landscaping Ltd | Administrative & support | 2020 |
| Coombs Group Holdings Ltd | Financial services | 2022 |
| Coopers Tyres & Brakes Ltd | Wholesale & retail | 2019 |
| Cornerstone Opportunities CIC | Health & social care | 2017 |
| Creamy Solutions Limited | Manufacturing | 2015 |
| Cribbco Property Limited | Real estate | 2026 |
| Crimpfil Limited | Professional & scientific | 1969 |
| CTL Business Services Ltd | Professional & scientific | 2025 |
| Cultrigging Ltd | Construction | 2026 |
| CWM Bargoed Mining Limited | Mining & quarrying | 2002 |
| Cwmdarhian Small Holdings Limited | Agriculture & fishing | 2016 |
| CYX Services Ltd | Construction | 2020 |
| Càlon Care Services Limited | Health & social care | 2019 |
| Càlon Property Services Limited | Real estate | 2021 |
| D Jones Management Limited | Administrative & support | 2016 |
| DAH Mortgages Limited | Financial services | 2021 |
| DAN Bolton Plumbing and Heating Ltd | Construction | 2023 |
| Darran Valley Consultants Limited | Professional & scientific | 2024 |
| David Russell Property Investments Limited | Real estate | 2018 |
| DIGIT4 Limited | Professional & scientific | 2003 |
| Digital Academic Ltd | Education | 2023 |
| Dihamand Safety Services Limited | Professional & scientific | 2018 |
| Dirty Cowgirl Events Ltd | Hospitality | 2022 |
| Disturbed District Limited | Wholesale & retail | 2025 |
| DKM Property Services Limited | Real estate | 2025 |
| Donovan & Jones Holdings Limited | Financial services | 2026 |
| Donovan & Jones Maintenance Limited | Households | 2023 |
| Donovan & Jones Property Rentals Limited | Real estate | 2026 |
| Dragon Retreats Ltd | Hospitality | 2026 |