| 112 Pebble Court RTM Company Limited | Households | 2016 |
| 118 GAS Ltd | Construction | 2021 |
| 12 Waverley Road Management Co. Limited | Households | 2005 |
| 129 Southwood Road RTM Company Limited | Households | 2025 |
| 161 Southwood Road RTM Company Limited | Households | 2009 |
| 17 Eastoke Management Company Limited | Administrative & support | 2015 |
| 21C Properties Limited | Construction | 2016 |
| 3 ELM Grove Management Company Limited | Households | 2019 |
| 30 ST. Andrews Road Management Company Limited | Households | 1998 |
| 392 Seafront Management Company Limited | Households | 2004 |
| 4G Building Solutions Limited | Construction | 2015 |
| 4GH Management Company Limited | Real estate | 2017 |
| 60-62A Sinah Lane (Management) Limited | Households | 2013 |
| 8 Enterprises Ltd. | Other services | 2015 |
| 8 Prince George Street Management Company Limited | Households | 2006 |
| A.Fleming(Southsea)Limited | Extraterritorial | 1923 |
| A.G. Militaria Ltd | Wholesale & retail | 2011 |
| A.H.Brown(Hayling Island)Limited | Agriculture & fishing | 1952 |
| Aarav Hayling Ltd | Wholesale & retail | 2024 |
| AB Medical Consulting Limited | Health & social care | 2018 |
| Abcf Property Ltd | Real estate | 2026 |
| Aber Co-Living Limited | Real estate | 2018 |
| AC Project Interior Design Ltd | Professional & scientific | 2020 |
| Acasta Court Limited | Households | 2003 |
| Accountart Business Services Ltd | Professional & scientific | 2013 |
| Adams & Ryley Ltd | Professional & scientific | 2011 |
| Adams&Adams Holdings Ltd | Households | 2025 |
| Adelphia Interactive LP | | 2015 |
| Adkp Services Limited | Professional & scientific | 1997 |
| Advance Cooling Limited | Construction | 2016 |
| Advance Office Supplies Limited | Transport & logistics | 1978 |
| Advanced Marine Computer Services Limited | Transport & logistics | 2001 |
| Aesthetics & Wellness by Zara Willis Limited | Other services | 2025 |
| Affinity Business Consulting Ltd | Information & communication | 2010 |
| Agaligo Limited | Professional & scientific | 2017 |
| AGH Marine Limited | Arts & recreation | 2023 |
| AI Wealth Management LLP | | 2011 |
| Air Services Sussex Ltd | Professional & scientific | 2017 |
| Airborne Industrial Services Limited | Construction | 2013 |
| Aitch Sea Property Limited | Real estate | 2025 |
| Aiwiser Ltd | Education | 2025 |
| Ajcsprojects Limited | Information & communication | 2019 |
| AJH Groundworks Ltd | Construction | 2014 |
| AJL Management Solutions Ltd | Professional & scientific | 2023 |
| AJL Trading Ltd | Wholesale & retail | 2021 |
| AKRE8 Ltd | Construction | 2022 |
| Alan Dainty Building Limited | Construction | 2003 |
| Albert Edward Court Ltd | Households | 2022 |
| Alex Kebabs Limited | Hospitality | 2024 |
| Alexander Books Limited | Wholesale & retail | 2017 |
| Alexandra Mary Murdoch Ltd | Extraterritorial | 2022 |
| Alexandra Mary Wise Ltd | Extraterritorial | 2022 |
| Alexandra Murdoch Ltd | Extraterritorial | 2022 |
| Alexandra Wise Ltd | Extraterritorial | 2024 |
| ALL About Windows (Southern) Limited | Construction | 2014 |
| Allan Technology Consulting Ltd | Information & communication | 2025 |
| Allsorts Antiques Limited | Wholesale & retail | 2021 |
| Alpha Massage Ltd | Health & social care | 2022 |
| ALS Flexisure Limited | Extraterritorial | 2023 |
| ALT Programmes Limited | Professional & scientific | 2013 |
| Amante Court Limited | Households | 2018 |
| Amhaven Limited | Professional & scientific | 1998 |
| Amos MEX Services Ltd | Wholesale & retail | 2021 |
| Andrew Green Building Limited | Construction | 2004 |
| Animals at Home Meon Ltd | Other services | 2010 |
| Anna Wells Ltd | Professional & scientific | 2022 |
| Annes Court Management Company Limited | Households | 1975 |
| Ansturo Limited | Professional & scientific | 2014 |
| Anthony Buckley Limited | Health & social care | 2013 |
| Anthonybostockwellness Ltd | Education | 2025 |
| Anticyclone Systems Limited | Professional & scientific | 1998 |
| Anvex Limited | Professional & scientific | 1994 |
| AP Software Quality Services Limited | Administrative & support | 2008 |
| Apple Features Limited | Information & communication | 2011 |
| Aqua Kitchens and Bathrooms Limited | Construction | 1999 |
| ARC Saas Limited | Professional & scientific | 2023 |
| Architectural Planning Limited | Professional & scientific | 2016 |
| Arlene Castle Limited | Professional & scientific | 2003 |
| Arundel Butchers Limited | Wholesale & retail | 2001 |
| Arunsolar Ltd | Professional & scientific | 2021 |
| Ashby Place Freehold Ltd | Real estate | 2012 |
| Assist Software Test Management Limited | Information & communication | 2007 |
| Atherley Road Residents Company Limited | Households | 1998 |
| Atkins Kendall Catering Limited | Hospitality | 2026 |
| Atkins Kendall Seafront Catering Limited | Hospitality | 2026 |
| ATL Mobile Truck Wash Limited | Other services | 2017 |
| Austen Gardens Management Company Limited | Administrative & support | 2016 |
| Automotive Security Limited | Wholesale & retail | 2008 |
| Autosource Solutions Ltd | Information & communication | 2026 |
| Avalon Wholesale (Potsmouth) Limited | Administrative & support | 2001 |
| Aviation Interiors Ltd | Manufacturing | 2025 |
| Azurient Business Solutions Limited | Professional & scientific | 2009 |
| Babcock Probate & Tax Services Limited | Professional & scientific | 2015 |
| Babcock Tax and Accountancy Services Limited | Professional & scientific | 2008 |
| Back 2 Roofing Limited | Construction | 2021 |
| Baltish Limited | Administrative & support | 1965 |
| Balu Consulting Limited | Professional & scientific | 2022 |
| Bamberkarn Limited | | 1974 |
| Barber Walker Consulting Ltd | Professional & scientific | 2021 |
| Bareskin Aesthetics Ltd | Other services | 2011 |