| Styled by Abbie Ltd | Other services | 2026 |
| Suan IT Limited | Information & communication | 2022 |
| Subsea Fibre Solutions Ltd | Information & communication | 2012 |
| Sudeley Estates Limited | Real estate | 1980 |
| Sugarsnap Limited | Other services | 2003 |
| Sun Radio Solutions Ltd | Information & communication | 2016 |
| Sundial Communications Limited | Professional & scientific | 2024 |
| Sundog Grounds Maintenance Limited | Administrative & support | 2011 |
| Sundog Hire & Facilities Ltd | Administrative & support | 2013 |
| Sundog Landscaping Ltd | Administrative & support | 2012 |
| Sunrise Innovations Limited | Information & communication | 2024 |
| Sunset Effects Limited | Information & communication | 2022 |
| Sunshine Goods and Services Limited | Wholesale & retail | 2025 |
| Suntricity Ltd | Professional & scientific | 2009 |
| Supplier Squad Ltd | Professional & scientific | 2025 |
| Supplimmense Ltd | Wholesale & retail | 2024 |
| Surrey & Hampshire News Media Limited | Information & communication | 1979 |
| Sushma Properties Ltd | Real estate | 2020 |
| Sustainable Fitness UK Ltd | Other services | 2019 |
| Sutherland Health Group Limited | Wholesale & retail | 2004 |
| Sutkus Ltd | Transport & logistics | 2019 |
| Suzanne Hemchaoui Partnerships and Projects Ltd | Professional & scientific | 2025 |
| Svend Holst Associates Limited | Administrative & support | 1987 |
| SW Building Contractors of Marlborough Limited | Construction | 2011 |
| Swan Court Freeholders Limited | Real estate | 2007 |
| Swanberry Ltd | Wholesale & retail | 2022 |
| Swans Travel Limited | Transport & logistics | 2004 |
| Swanson Aviation Consultancy Limited | Professional & scientific | 2018 |
| Swasti Yoga Ltd | Other services | 2021 |
| Sweaty & Saddle Ltd | Arts & recreation | 2026 |
| Sweet Briars Property Limited | Financial services | 2022 |
| Sweet Stories Ltd | Manufacturing | 2018 |
| Swift (24 Hour) Courier Services Limited | Transport & logistics | 1994 |
| Swift (24) Property Services Limited | Real estate | 1997 |
| Swift 3RD Party Logistics Ltd | Transport & logistics | 2022 |
| Swift Appliance Services Limited | Wholesale & retail | 2000 |
| Swift Group of Companies Limited | Financial services | 2005 |
| Swindon Will Writing Limited | Other services | 2022 |
| Switchautos Ltd | Wholesale & retail | 2020 |
| Syght Ltd | Professional & scientific | 2011 |
| Sylcom Limited | Hospitality | 2024 |
| Symbolic Films Ltd | Information & communication | 2021 |
| Symington Elvery Estates Limited | Professional & scientific | 2021 |
| Symington Holdings Limited | Financial services | 2020 |
| Symmetree Limited | Information & communication | 2003 |
| Synergy Fuels UK Ltd | Wholesale & retail | 2011 |
| Sysmpire Technologies Limited | Information & communication | 2015 |
| System Controls Installation Limited | Manufacturing | 2015 |
| Systematics International Limited | Information & communication | 2007 |
| T G B Brickwork Limited | Administrative & support | 2003 |
| T LEE Limited | Professional & scientific | 2024 |
| T Leeson Contracting Limited | Professional & scientific | 2015 |
| T S International Recruitment Ltd | Administrative & support | 2011 |
| T-Impact Limited | Manufacturing | 2004 |
| T.W. Electronics (Newbury) Limited | Manufacturing | 1980 |
| T3 Sports Agency Ltd | Arts & recreation | 2023 |
| Tactical K9 Solutions Limited | Administrative & support | 2019 |
| Tacticaldespatch Logistics Ltd | Transport & logistics | 2025 |
| TAD Global Solutions Limited | Information & communication | 2013 |
| Tadley Engineering Limited | Manufacturing | 1998 |
| Tadley Powder Coating Limited | Construction | 2016 |
| Tadley Precision Machining Limited | Manufacturing | 2016 |
| TAG Forestry Investments Ltd. | Agriculture & fishing | 2017 |
| TAI Logistics Ltd | Construction | 2019 |
| Takbro Limited | Extraterritorial | 1979 |
| Take ME Home James Ltd | Transport & logistics | 2022 |
| Takethebrick Ltd | Wholesale & retail | 2023 |
| Takshila Solutions Limited | Information & communication | 2019 |
| Taleju Kitchen and Catering Ltd | Hospitality | 2024 |
| Talkmobile Limited | Information & communication | 2001 |
| Tall Pumpkin Ltd | Professional & scientific | 2026 |
| Tallon Perry Consulting Ltd | Professional & scientific | 2019 |
| Tallus Ltd | Administrative & support | 2016 |
| Tania Brookes Garden Design Ltd | Professional & scientific | 2019 |
| Tankslider Ltd | Professional & scientific | 2026 |
| Tanya Sesia Ltd | Professional & scientific | 2015 |
| Tara Jordan Photography Ltd | Professional & scientific | 2025 |
| Tarala Consulting Ltd | Professional & scientific | 2014 |
| Tarala Holdings Ltd | Financial services | 2024 |
| Tarala Solutions Ltd | Professional & scientific | 2014 |
| Tarala Ventures Ltd | Financial services | 2017 |
| Target Stati-Cal Ltd | Extraterritorial | 2013 |
| Tarnhelm Ltd. | Manufacturing | 2016 |
| Taskport Limited | Information & communication | 2018 |
| Tassal Estates Limited | Real estate | 2021 |
| Taste Holdings Limited | Financial services | 2023 |
| Taste Property Limited | Real estate | 2023 |
| Taurus Property Investments Limited | Construction | 1998 |
| Tavener Gallagher Consulting Ltd | Hospitality | 2019 |
| Taylak Limited | Professional & scientific | 2017 |
| Taylor Read Ltd | Manufacturing | 2025 |
| Tayyaba Khan Associates Limited | Administrative & support | 2026 |
| TB Commercial Properties Ltd | Real estate | 2022 |
| TC Construction Management Services Ltd | Construction | 2025 |
| TCL Sports Limited | Wholesale & retail | 2026 |
| TD Capital Holdings Ltd | Financial services | 2026 |
| TD Manhattan Nails Ltd | Other services | 2019 |
| Teach 247 Limited | Administrative & support | 2001 |
| Teach and Connect Ltd | Administrative & support | 2022 |
| Team Refrigeration & Air Conditioning Limited | Administrative & support | 2007 |