| THE Merchant’S Table Limited | Wholesale & retail | 2023 |
| THE Mere Management Company Limited | Real estate | 2022 |
| THE Mess Express Limited | Water & waste | 2026 |
| THE Milk Hub Ltd | Administrative & support | 2019 |
| THE Milk Shed Ipswich Limited | Hospitality | 2023 |
| THE Mill & Willows Fisheries Ltd | Arts & recreation | 2026 |
| THE Most Store Ltd | Wholesale & retail | 2025 |
| THE Movement Blueprint Ltd | Education | 2019 |
| THE Moving Plaice Events Limited | Hospitality | 2020 |
| THE Moving Plaice Limited | Hospitality | 2019 |
| THE Moving Shop Limited | Transport & logistics | 2012 |
| THE Multi-Schools C.I.C. | Education | 2019 |
| THE Musicians' and Entertainers' Accountancy Service Limited | Professional & scientific | 2003 |
| THE Natural Medic Ltd | Health & social care | 2024 |
| THE NET Gain Club Limited | Education | 2023 |
| THE New Ecology Party Ltd | Other services | 2025 |
| THE New Wolsey Theatre Company Limited | Arts & recreation | 2000 |
| THE Nexstage Limited | Professional & scientific | 2025 |
| THE Next Step Collective CIC | Education | 2026 |
| THE Nightingale Wellness Clinic Limited | Other services | 2022 |
| THE Number Experts Limited | Information & communication | 2008 |
| THE Nutrition Rehab Collective Ltd | Health & social care | 2026 |
| THE Oaks Caravan Park Limited | Other services | 2003 |
| THE Obligations Office Limited | Professional & scientific | 2018 |
| THE Odyssey Hub Ltd | Education | 2025 |
| THE Offshore Transmission Company Limited | Administrative & support | 2007 |
| THE Old English BED Company Limited | Manufacturing | 2003 |
| THE Old Maltings Management Company (Suffolk) Limited | Households | 2017 |
| THE Old Meeting House Ltd | Transport & logistics | 2026 |
| THE Old Stackyard Ltd | Households | 2020 |
| THE Old Times Public House Ltd | Hospitality | 2011 |
| THE Oliver Hayward Playbarn Limited | Arts & recreation | 2015 |
| THE Olivologist Limited | Wholesale & retail | 2020 |
| THE Online Sales Ltd | Wholesale & retail | 2025 |
| THE Onono Company Limited | Manufacturing | 2013 |
| THE Opportunity Stage CIC | Arts & recreation | 2025 |
| THE Orange Nails Limited | Information & communication | 2007 |
| THE Orchard Street Property Company Limited | Real estate | 1996 |
| THE Organic Group Ltd | Hospitality | 2009 |
| THE Organic Shop Limited | Wholesale & retail | 1996 |
| THE Orwell Estate Family Trust Company Limited | Other services | 2023 |
| THE P P and C Estate Limited | Real estate | 2009 |
| THE Padel Drop Ltd | Wholesale & retail | 2025 |
| THE Payment People (Card Services) Limited | Wholesale & retail | 2023 |
| THE Peartree Kindergarten (Reydon) Ltd | Education | 2024 |
| THE Peartree Kindergarten Limited | Education | 2003 |
| THE Pedal House Limited | Wholesale & retail | 2014 |
| THE Pernicious Anaemia Society | Health & social care | 2012 |
| THE Pink Shed Beauticians Ltd | Other services | 2018 |
| THE Pitch Media Network Limited | Information & communication | 2020 |
| THE PMW Designs Ltd | Construction | 2024 |
| THE Polishing MAN Limited | Manufacturing | 2019 |
| THE PR Sphere Ltd | Professional & scientific | 2015 |
| THE Prime Pick Shop Limited | Information & communication | 2025 |
| THE Probate Advisory Company Limited | Professional & scientific | 2020 |
| THE Professional Pool Limited | Extraterritorial | 2017 |
| THE Profit First Coach Ltd | Administrative & support | 2024 |
| THE Project Academy Limited | Professional & scientific | 2007 |
| THE Project Pool Limited | Professional & scientific | 2017 |
| THE Property Capital Suffolk Ltd | Real estate | 2024 |
| THE Property Warren Limited | Real estate | 2008 |
| THE Psychology Consultancy (UK) Limited | Professional & scientific | 2004 |
| THE Purposeful Investor Ltd | Real estate | 2025 |
| THE Purposeful Way Limited | Professional & scientific | 2025 |
| THE Qigong Academy Ltd | Education | 2022 |
| THE Railway Westerfield Limited | Hospitality | 2000 |
| THE Rampant Horse Inn Ltd | Hospitality | 2015 |
| THE Really Good Carpentry Company Limited | Manufacturing | 2014 |
| THE Remuneration Partnership Limited | Professional & scientific | 2000 |
| THE Rolling Roast Coffee Ltd | Hospitality | 2025 |
| THE Rolling Spa Company Limited | Other services | 2023 |
| THE Roper Collective Ltd | Arts & recreation | 2013 |
| THE Rosewater Group Limited | Administrative & support | 2016 |
| THE Round Trustees NO 1 Limited | Administrative & support | 2026 |
| THE Round Trustees NO 2 Limited | Administrative & support | 2026 |
| THE Roundabout Nursery Ltd | Other services | 2009 |
| THE Rupert Fison Centre Limited | Real estate | 1996 |
| THE Rutter Group Limited | Financial services | 2026 |
| THE Sage Lady Limited | Information & communication | 2014 |
| THE Saints Ipswich Community Interest Company | Wholesale & retail | 2018 |
| THE Sandpipers (Aldringham) Management Company Limited | Households | 2020 |
| THE Saracens Head Ltd | Hospitality | 2015 |
| THE Share Option Centre Limited | Professional & scientific | 1994 |
| THE Shear Club Ltd | Other services | 2021 |
| THE Shelley Centre for Therapeutic Riding | Health & social care | 2006 |
| THE Shoe Quarter Limited | Construction | 2015 |
| THE Shop Small Events Ltd | Administrative & support | 2023 |
| THE SIX Bells PUB (Preston ST Mary) Limited | Hospitality | 2019 |
| THE Skin Edit Company (Suffolk) Ltd | Other services | 2020 |
| THE Society of the Inner Light Limited | Other services | 1948 |
| THE Sovereign Place (Cambridge) Management Company Limited | Real estate | 2003 |
| THE Spinneys Development Ltd | Construction | 2025 |
| THE Sports Sphere Group Ltd | Professional & scientific | 2015 |
| THE Spotted Penguin Company Limited | Wholesale & retail | 2014 |
| THE Sterling Complex Management Co. Limited | Real estate | 1993 |
| THE Stock Option Centre Limited | Professional & scientific | 1989 |
| THE Storage Yard Company Limited | Transport & logistics | 2005 |
| THE Street (Raydon) Management Company Limited | Real estate | 2019 |
| THE Suffolk Cleaning Hub Ltd | Administrative & support | 2024 |
| THE Suffolk Coast Limited | Administrative & support | 2012 |