| Sutton Hill (Burpham) Management Company Limited | Households | 2002 |
| SVS Software Solutions Limited | Information & communication | 2015 |
| SW London Solutions Limited | Construction | 2014 |
| SW Oral Care Ltd | Health & social care | 2024 |
| SW Workshops Limited | Wholesale & retail | 2025 |
| Swag Design Limited | Professional & scientific | 2005 |
| Swan Island Developments Limited | Construction | 2014 |
| Swarm IT Solutions Limited | Information & communication | 2020 |
| Swarnica Technologies Ltd | Information & communication | 2017 |
| Sweet Seasons Ltd | Manufacturing | 2022 |
| Swift Deals Bay Ltd | Wholesale & retail | 2025 |
| Swiftpipe Ltd | Mining & quarrying | 2008 |
| Swingvision Golf Limited | Administrative & support | 2025 |
| Switch UP Telecoms Limited | Information & communication | 2025 |
| Swole Gym Clothing Limited | Wholesale & retail | 2024 |
| Swole Nutrition Limited | Hospitality | 2017 |
| Swurve Creative Ltd | Information & communication | 2024 |
| Swyrll Ltd | Other services | 2022 |
| Sycamore Close Residents Management Company Limited | Households | 2016 |
| Sycamore Massage Limited | Education | 2003 |
| Sycamore Ventures Limited | Real estate | 2021 |
| Sydney Vernon Limited | Professional & scientific | 2025 |
| Sylvan Close Limited | Real estate | 2006 |
| Sync Brain IT Limited | Information & communication | 2026 |
| Syncom (UK) Limited | Information & communication | 2013 |
| Synergy Security Management Limited | Administrative & support | 2013 |
| Synserve Ltd | Financial services | 2016 |
| Syrup Ltd. | Wholesale & retail | 2020 |
| Sys-Teams Limited | Information & communication | 2001 |
| T & C Pools Maintenance Ltd | Other services | 2017 |
| T & J Accident Claims Care Ltd | Wholesale & retail | 2025 |
| T & P Carpentry and Construction Ltd | Construction | 2016 |
| T and D Worx Commercial Contractors Limited | Construction | 2023 |
| T C N Communications Limited | | 1987 |
| T Muir Dalziel Limited | Construction | 2003 |
| T-Rex Expedition Limited | Transport & logistics | 2022 |
| T. TEC Design Limited | Information & communication | 1996 |
| T.A.S. Scaffolding Limited | Construction | 2003 |
| T.E.Russell Limited | Real estate | 1962 |
| T.Hilling & Co.Limited | Agriculture & fishing | 1954 |
| T3 Capital Partners Limited | Administrative & support | 2024 |
| TAB Consultancy Services Ltd | Construction | 2015 |
| Tabulate Limited | Information & communication | 2019 |
| Tacitus Limited | Professional & scientific | 2015 |
| Taco Bell Asia Franchising, LP | | 2019 |
| Taco Bell UK and Europe Limited | Hospitality | 1968 |
| Tadek Limited | Professional & scientific | 2010 |
| Tadpole Ltd | Administrative & support | 2008 |
| Taganana Ltd | Manufacturing | 2014 |
| Tahirsiddiq Ltd | Transport & logistics | 2025 |
| TAI & Feng Ltd | Real estate | 2019 |
| Tailor Safaris Ltd | Administrative & support | 2017 |
| Tailored Electrical Solutions Ltd | Construction | 2024 |
| Tails & Fables Ltd | Manufacturing | 2026 |
| Take Charge Solar Ltd | Construction | 2022 |
| Take Time Nails 29 Ltd | Other services | 2025 |
| Takesure Holdings Ltd | Financial services | 2023 |
| TAL Property Maintenance Ltd | Other services | 2016 |
| Talacrest 2000 A.D. Limited | Wholesale & retail | 1999 |
| Talampro Ltd | Administrative & support | 2014 |
| Talent Bricks Limited | Administrative & support | 2023 |
| Talented Human Capital Solutions Ltd. | Administrative & support | 2016 |
| Talk to US Limited | Administrative & support | 2002 |
| Talking Cat Consulting Limited | Professional & scientific | 2019 |
| Tamadan Ltd | Professional & scientific | 2022 |
| Tamatsi Investments Ltd | Real estate | 2024 |
| Tambrisk Pictures LLP | | 2009 |
| Tamim Medical Consultants Limited | Health & social care | 2010 |
| Tamisa Group Ltd | Information & communication | 2021 |
| Tamum Consulting Ltd | Information & communication | 2022 |
| TAN & TAN Partners Limited | Professional & scientific | 2026 |
| Tang Investments Ltd | Real estate | 2015 |
| Tangletrees Limited | Professional & scientific | 2013 |
| Tanners & Partners Limited | Professional & scientific | 2018 |
| Tanners Property Holdings Limited | Real estate | 2025 |
| Tannis Properties Limited | Real estate | 1991 |
| Tantallon Investments Limited | Financial services | 2020 |
| TAP in Finance Ltd | Professional & scientific | 2025 |
| Tapani Holdings Limited | Real estate | 2018 |
| Tara Construction Limited | Construction | 2009 |
| Targa Properties Limited | Real estate | 1983 |
| Target Energy Solutions Limited | Information & communication | 2005 |
| Target Industries Limited | Agriculture & fishing | 1995 |
| Target-Fit Limited | Arts & recreation | 2015 |
| Targetrehab Ltd | Other services | 2022 |
| Tarind Limited | Construction | 2000 |
| Taro Modelmaking Limited | Manufacturing | 2021 |
| Tarragon & Sage Limited | Real estate | 2016 |
| Taste of India (Surrey) Ltd | Hospitality | 2015 |
| Taste of Woking Limited | Hospitality | 2021 |
| Tate 88 Ltd | Wholesale & retail | 2019 |
| Taurus BD Limited | Manufacturing | 2022 |
| Taurus Technologies Solutions Limited | Information & communication | 2023 |
| Tavak Limited | Manufacturing | 1958 |
| Taxly Technologies Limited | Administrative & support | 2026 |
| Tayfoor Ltd | Real estate | 2017 |
| Taylor & FOX Properties Ltd | Real estate | 2013 |
| Taylor Business English Limited | Education | 2026 |
| Taylor Designs Limited | Wholesale & retail | 2018 |
| Taylor-Brown Ltd | Professional & scientific | 2012 |