| 1-4 Marina Buildings RTM Company Limited | Households | 2020 |
| 11 Victoria Street Management Limited | Real estate | 2016 |
| 122 High Street Ltd | Households | 2018 |
| 1810 Engineering Ltd | Manufacturing | 2018 |
| 26 Marine Parade West Limited | Households | 1998 |
| 2B Trained Ltd | Administrative & support | 2021 |
| 3 Spark Racing Limited | Arts & recreation | 2018 |
| 3P Renovations Ltd | Construction | 2025 |
| 46 MPE Management | Households | 2019 |
| 47 Festing Road Management Company Limited | Households | 1983 |
| 4TD Limited | Administrative & support | 2020 |
| A&At Investments Ltd | Wholesale & retail | 2024 |
| Abouttyme Ltd | Professional & scientific | 2025 |
| Absolute IP Ltd | Information & communication | 2022 |
| Actesso Holdings Limited | Financial services | 2018 |
| Actesso Medical Supports Limited | Wholesale & retail | 2012 |
| Actimerce Consultancy Limited | Professional & scientific | 2019 |
| Adoptive Technologies Limited | Information & communication | 2024 |
| Aerohydro Consulting Limited | Professional & scientific | 2015 |
| Afroshack Limited | Hospitality | 2012 |
| ALC Roofing & Construction Ltd | Construction | 2020 |
| Aleksandar Budic Limited | Other services | 2011 |
| Alma Bay Ltd | Health & social care | 2023 |
| ALP Accountancy Ltd | Professional & scientific | 2015 |
| Alver Automation Ltd | Information & communication | 2022 |
| Alver Roofing and Construction Limited | Construction | 2024 |
| Ambleside Residents Association Limited | Real estate | 1973 |
| Andrei Idorasi Limited | Transport & logistics | 2017 |
| Andy Parry Consulting Ltd | Information & communication | 2022 |
| Anubis Label Technology Ltd | Manufacturing | 2000 |
| AP Marine Interiors Ltd | Manufacturing | 2025 |
| Apidge Electrical Services Ltd | Manufacturing | 2025 |
| Ascend Finance Recruitment Ltd | Administrative & support | 2025 |
| Ascend Studios CLO Ltd | Manufacturing | 2025 |
| ASD Fire Solutions Limited | Professional & scientific | 2014 |
| ASG Consulting Limited | Administrative & support | 2011 |
| Ashtree Court Residents Management Company Limited | Households | 2018 |
| Astrostar Send Ltd | Education | 2026 |
| Atomos Realty Limited | Real estate | 2024 |
| Atomos Solutions Limited | Information & communication | 2015 |
| Axis Connect Limited | Information & communication | 2025 |
| Ayintap SM Ltd | Hospitality | 2025 |
| Azcent Limited | Information & communication | 2009 |
| B.A.G.G.S. Property Limited | Construction | 2023 |
| Bakerellys Ltd | Wholesale & retail | 2024 |
| Barrett's Property Ltd | Real estate | 2019 |
| Baseline Marine Products Limited | Wholesale & retail | 1989 |
| Bayside Finance Ltd | Financial services | 2025 |
| Beaufort Electrical Services Ltd | Construction | 2017 |
| Bembridge Lodge (Lee-On-The-Solent) Residents Company Limited | Households | 1973 |
| Birdy Boat Repairs Ltd | Manufacturing | 2025 |
| Black Dog Property Maintenance Ltd | Construction | 2025 |
| Blue Cobra Cuisine Ltd | Hospitality | 2025 |
| Bold Technology Limited | Wholesale & retail | 1999 |
| Bright Cleaning (Hampshire) Limited | Other services | 2013 |
| C & C Property (Southern) Ltd | Real estate | 2022 |
| C&L Carpentry (Southern) Limited | Manufacturing | 2015 |
| C&L Management (Southern) Limited | Construction | 2015 |
| C&L Management LLP | | 2008 |
| C&L Property (Southern) Limited | Real estate | 2005 |
| Caduceus Support Ltd | Professional & scientific | 2026 |
| Canine Plus Limited | Professional & scientific | 2012 |
| Cantab Applied Solutions Limited | Information & communication | 2018 |
| Carter Smith Property Finance Ltd | Financial services | 2025 |
| Castle Marina Management Limited | Real estate | 1993 |
| Catering & Sweet Supplies Ltd | Wholesale & retail | 2025 |
| Cavendish Accounting Services Ltd | Professional & scientific | 2012 |
| Ceasar Limited | Real estate | 2025 |
| Cellarstone Ltd | Real estate | 2019 |
| Chimeric Ltd | Health & social care | 2026 |
| Christine Poynter Ltd | Financial services | 2008 |
| Churcher House RTM Company Limited | Households | 2018 |
| Cincin Wines Ltd | Wholesale & retail | 2017 |
| Clark & Family Property Ltd | Real estate | 2026 |
| Clarke-Roberts Limited | Administrative & support | 2017 |
| Clean Agents (South) Ltd | Administrative & support | 2020 |
| Cleveland Place RTM Company Ltd | Households | 2019 |
| Club Beauté Ltd | Other services | 2025 |
| CME Automotive Marketing Ltd | Professional & scientific | 2020 |
| CME Holding Group Ltd | Financial services | 2019 |
| CME Media Limited | Professional & scientific | 2014 |
| Coleborn Marine and Aerospace Ltd | Manufacturing | 2025 |
| Coleworks Ltd | Professional & scientific | 2022 |
| Collectorsquest Ltd | Wholesale & retail | 2024 |
| Comerford IT Limited | Information & communication | 2013 |
| Commercial & Residential Mechanical Services Ltd | Other services | 2019 |
| Complete Protection South Ltd | Financial services | 2016 |
| Connection Technologies Limited | Information & communication | 2018 |
| Cory Marine Ltd | Professional & scientific | 2023 |
| Courieris Ltd | Transport & logistics | 2024 |
| Court Barn Catering Ltd | Hospitality | 2025 |
| CRE8TIVE Limited | Arts & recreation | 2005 |
| Cresatech Limited | Manufacturing | 2011 |
| Crystalclearcovers.Com Ltd | Wholesale & retail | 2018 |
| Ctech Business Solutions Limited | Information & communication | 2018 |
| Cupla Taverns Ltd | Hospitality | 2019 |
| Daedalus Park Management Company Limited | Professional & scientific | 2016 |
| David Brewster Limited | Real estate | 2017 |
| David Hutchison Ltd | Financial services | 2016 |
| Delscar Construction Ltd | Construction | 2025 |