| Star Reach Limited | Professional & scientific | 2014 |
| Statepark Limited | Real estate | 1995 |
| Stay Loose Digital Limited | Arts & recreation | 2010 |
| Stefan Estates Ltd | Professional & scientific | 2024 |
| Stepping Stone Films Ltd | Information & communication | 2022 |
| Steve Hesketh Management Services Limited | Manufacturing | 2017 |
| Stewart Brooks Associates Ltd. | Professional & scientific | 2016 |
| Stewart Linney Plant Limited | Manufacturing | 2009 |
| STF Consulting Ltd | Professional & scientific | 2023 |
| STP Property Solutions Ltd | Administrative & support | 2022 |
| Strathy Wood Partnership LLP | | 2010 |
| Stratify Limited | Professional & scientific | 2006 |
| Stuart Murray Dairy Engineering Limited | Administrative & support | 1999 |
| Studio Charlton Ltd | Other services | 2025 |
| Sudarshana Ltd | Wholesale & retail | 2024 |
| Sudzapp Limited | Manufacturing | 2025 |
| SUM Equity Ltd | Professional & scientific | 2024 |
| Super Fade Barbers Limited | Other services | 2025 |
| Superiser Limited | Other services | 2015 |
| Supply Chain Engineering Limited | Professional & scientific | 2020 |
| Supply Chain Planning UK Limited | Transport & logistics | 2004 |
| Sureguard Appliances Limited | Other services | 2025 |
| Surveying Cymru (UK) Ltd | Construction | 2014 |
| Sweeney Ted's Limited | Other services | 2022 |
| Switchgear Support Limited | Manufacturing | 2007 |
| Syllogy Ltd | Professional & scientific | 2015 |
| Symanix Limited | Information & communication | 2009 |
| Tabletop Travels CIC | Administrative & support | 2025 |
| Tactical AI Limited | Information & communication | 2022 |
| Tagati Ltd | Manufacturing | 2019 |
| Tanas Property Investment Limited | Real estate | 2024 |
| Tavy Training Services Limited | Education | 1997 |
| Taylor Louis Ltd | Real estate | 2015 |
| Tazio Property Holdings Ltd | Real estate | 2017 |
| TCR Telecoms Ltd | Information & communication | 2024 |
| TD Design & Fabrication Limited | Manufacturing | 2005 |
| TDG Coffee Limited | Hospitality | 2021 |
| Techniclean Ltd | Administrative & support | 2023 |
| Tero Tech Maintenance Ltd | Construction | 2024 |
| Terrak Games Limited | Information & communication | 2021 |
| Teulu Ltd | Financial services | 2024 |
| Thai Town (Barry) Ltd | Hospitality | 2025 |
| THE Adams Family Ltd | Wholesale & retail | 2019 |
| THE Ancre Hill Barns Ltd | Extraterritorial | 2025 |
| THE Apex Method Ltd | Health & social care | 2025 |
| THE Ascent Group Limited | Professional & scientific | 1984 |
| THE Beauty Spot (Chepstow) Ltd | Other services | 2018 |
| THE Bush Inn Penallt Ltd | Hospitality | 2026 |
| THE Business Shepherd Ltd | Professional & scientific | 2006 |
| THE Change Decision UK Limited | Professional & scientific | 2026 |
| THE Chantry (Monmouth) Management Limited | Households | 2004 |
| THE Chop Shop Monmouth Limited | Other services | 2022 |
| THE Chota Estates Company Limited | Construction | 1983 |
| THE Clarinet Company Limited | Arts & recreation | 2017 |
| THE Classic Floor Company Limited | Wholesale & retail | 2005 |
| THE Cotswold Accountants Limited | Professional & scientific | 2019 |
| THE Garden Restaurant and Takeaway Ltd | Hospitality | 2025 |
| THE Gardens (Tutshill) Management Co Ltd | Real estate | 2015 |
| THE Good Slice Ltd | Hospitality | 2017 |
| THE Green Dragon Monmouth Ltd | Hospitality | 2018 |
| THE Hands Around the World Charitable Trust | Professional & scientific | 2002 |
| THE Hertfordshire Laser and Aesthetics Studio Ltd | Health & social care | 2015 |
| THE Horseshoe Inn (Mamhilad) Ltd | Hospitality | 2025 |
| THE Inn at Kilpeck Ltd | Hospitality | 2020 |
| THE Iota Group Ltd | Manufacturing | 2002 |
| THE KIT Crew Ltd | Extraterritorial | 2009 |
| THE Little Events Company Ltd | Arts & recreation | 2015 |
| THE Misbah Limited | Hospitality | 2016 |
| THE Monmouth GIN Company Ltd | Manufacturing | 2019 |
| THE Monmouth Savoy Trust | Arts & recreation | 2010 |
| THE Nest Childcare Services Ltd | Health & social care | 2023 |
| THE Oliver Daniel Group Limited | Financial services | 2025 |
| THE Original PUB Company Ltd | Hospitality | 2015 |
| THE PIG and Apple Monmouth Ltd | Hospitality | 2019 |
| THE Property Drop Ltd | Information & communication | 2017 |
| THE Queens Head Hotel (Monmouth) Limited | Hospitality | 2013 |
| THE Rebel Crumble Ltd | Hospitality | 2023 |
| THE Red Door Deli & Diner Limited | Hospitality | 2015 |
| THE Royal Oak (Monmouth) Limited | Hospitality | 2009 |
| THE Secret Walled Garden Limited | Hospitality | 2022 |
| THE Spiced Bread Pudding Company Ltd. | Manufacturing | 2010 |
| THE Strike LAB Ltd | Arts & recreation | 2026 |
| THE Vintage Garden Company Limited | Wholesale & retail | 2006 |
| Thomas & Russell Ltd | Hospitality | 2026 |
| Thorne Park Limited | Wholesale & retail | 2012 |
| Thoughtful Hospitality Ltd | Hospitality | 2026 |
| Tidals Stores Limited | Wholesale & retail | 1949 |
| Timfor Ltd | Agriculture & fishing | 2018 |
| Tinmans Court (Monmouth) Management Limited | Households | 2017 |
| Tinsky Limited | Professional & scientific | 2015 |
| Tintern Antiques Limited | Other services | 2014 |
| TJL Property Maintenance & Agri Services Ltd | Agriculture & fishing | 2022 |
| TMB Renewable Solutions Ltd | Construction | 2024 |
| TNF London Ltd | Wholesale & retail | 2014 |
| Toll House Project Management Ltd | Administrative & support | 2013 |
| TOM Walker Electrics Limited | Construction | 2026 |
| Tony’S 8AS Ltd | Construction | 2025 |
| Total Look Holdings Ltd | Financial services | 2021 |
| Totalpoint Limited | Real estate | 1993 |
| Tough Builders Ltd | Construction | 2003 |