| 161 Sumatra Road Limited | Real estate | 2015 |
| 4-5 Centre Cliff Limited | Households | 1995 |
| 56 Pier Avenue Limited | Households | 1992 |
| 59 Queens Crescent Limited | Households | 2006 |
| 69 Messina Avenue Limited | Households | 1999 |
| AB Vehicle Transport Limited | Extraterritorial | 2022 |
| Acol Consulting Ltd | Administrative & support | 2022 |
| Adnams Trust Company Limited | Other services | 1992 |
| AE Building & Landscaping Limited | Extraterritorial | 2024 |
| AES Brands Limited | Wholesale & retail | 2025 |
| Agency for Change Limited | Professional & scientific | 2013 |
| Air Sale Holdings Limited | Professional & scientific | 2014 |
| Air Sale Ltd | Extraterritorial | 2016 |
| Alan Woods Associates Limited | Professional & scientific | 2002 |
| Andy Hammett Plumbing & Heating Ltd | Construction | 2014 |
| ARD Laggan Investments Limited | Real estate | 2022 |
| Argassi Ltd | Transport & logistics | 2025 |
| ARL Projects Limited | Real estate | 2019 |
| Arthur G Limited | Real estate | 2008 |
| Baytree Property Maintenance Ltd | Construction | 2019 |
| Below the Fold Publishing Ltd | Information & communication | 2020 |
| Black Sciensus C.I.C. | Public administration | 2025 |
| Blackthorne Consulting Ltd | Administrative & support | 2022 |
| Blackwold Limited | Professional & scientific | 2024 |
| Bloom Southwold Ltd | Wholesale & retail | 2025 |
| Blyth BUS CIC | Transport & logistics | 2026 |
| Board DOH Ltd | Households | 2024 |
| Bridge Barn Ltd | Financial services | 2013 |
| BSC Commerce Limited | Wholesale & retail | 2025 |
| Buckenham Wine Bar Limited | Hospitality | 2025 |
| Bwjrb Properties Limited | Real estate | 2025 |
| Bzee Ltd | Transport & logistics | 2026 |
| C.C.Boggis Limited | Agriculture & fishing | 1948 |
| C.R. Fournel Limited | Wholesale & retail | 1986 |
| Churchmanor Consulting Limited | Real estate | 1993 |
| Cooper & Denny Limited | Construction | 1963 |
| CVR Enterprise Limited | Wholesale & retail | 2024 |
| CVR Fulfilment Limited | Wholesale & retail | 2024 |
| D & a Knights Limited | Other services | 2003 |
| D Williams (UK) Limited | Professional & scientific | 2006 |
| Designspan Limited | Professional & scientific | 1985 |
| Devil's Advocate - Legal Revision Studio Limited | Education | 2022 |
| DIB Prop Co Limited | Real estate | 2024 |
| Dodos Nest Limited | Households | 2025 |
| DOH Pizzeria Limited | Hospitality | 2023 |
| Douglas House Management Company (Southwold) Limited | Households | 2007 |
| Duchies at Home Ltd | Wholesale & retail | 2026 |
| Duncan & SON (Holdings) Limited | Administrative & support | 2004 |
| Duncan & SON (Southwold) Limited | Construction | 2004 |
| Easitron Limited | Manufacturing | 1993 |
| East Green Homes Limited | Construction | 2018 |
| Easterly Consulting Ltd | Information & communication | 2023 |
| Easy Peeler Ltd | Administrative & support | 2024 |
| Easyblinds International Limited | Manufacturing | 2017 |
| Emsosaru Limited | Real estate | 2005 |
| Equivents UK Ltd | Arts & recreation | 2015 |
| Expat Therapy Hub Ltd | Information & communication | 2025 |
| Farleigh House (Southwold) Limited | Households | 2015 |
| FI Translations Ltd | Professional & scientific | 2022 |
| Fieldstile Properties Limited | Real estate | 2025 |
| Forefront CG Limited | Professional & scientific | 2013 |
| Foster CDB Ltd | Professional & scientific | 2025 |
| Fournel (Southwold) Limited | Wholesale & retail | 1987 |
| Fournel Jewellers Limited | Wholesale & retail | 1968 |
| Fuller Associates Limited | Professional & scientific | 2014 |
| FYF Ltd | Arts & recreation | 2026 |
| G.B.Chadd(Holdings)Limited | Wholesale & retail | 1963 |
| G.B.Chadd,Limited | Real estate | 1913 |
| GEM Fitness Ltd | Arts & recreation | 2003 |
| Glass Half Full Productions Limited | Arts & recreation | 2013 |
| Global Chair Components Ltd | Wholesale & retail | 1996 |
| Glochair Holdings Ltd | Wholesale & retail | 2017 |
| Goldings Group (Southwold) Ltd | Financial services | 2021 |
| Good Connections Walberswick Ltd | Other services | 2023 |
| Green Bird Limited | Wholesale & retail | 2007 |
| Hanslope Limited | Agriculture & fishing | 1997 |
| Harriets Southwold Ltd | Hospitality | 2026 |
| Heads-Up Tennis LLP | | 2026 |
| HRA Limited | Administrative & support | 2011 |
| Imagineer London Limited | Professional & scientific | 2013 |
| Inras Consulting Ltd | Professional & scientific | 2010 |
| J Gaffney & SON (Wigan) Limited | Real estate | 1956 |
| JW Productions Ltd | Professional & scientific | 2020 |
| Kent & Wilkinson Plumbing & Heating Ltd | Construction | 2021 |
| KNC Homes Ltd | Real estate | 2025 |
| KNC Limited | Wholesale & retail | 2025 |
| KPP Catering Limited | Hospitality | 2015 |
| Kravai Solutions Limited | Information & communication | 2025 |
| Layla Amber Limited | Arts & recreation | 2016 |
| Linc Freight Management Limited | Transport & logistics | 1991 |
| Linc Warehouse Services Ltd | Administrative & support | 2017 |
| Loaded-Southwold Limited | Hospitality | 2022 |
| Longbourn Ltd | Professional & scientific | 2017 |
| Lucidmusic Ltd | Information & communication | 2020 |
| Lytton Tree Lodge Limited | Hospitality | 2021 |
| Mantins Limited | Professional & scientific | 2023 |
| Marcus Knight Interiors Limited | Construction | 2005 |
| Marriott Fishing Company Limited | Agriculture & fishing | 2024 |
| MEA Boutique Limited | Wholesale & retail | 2018 |
| Micropress Printers Limited | Manufacturing | 1979 |