| SJ Rivers Limited | Professional & scientific | 2015 |
| SJ Structural Steelwork Ltd | Construction | 2015 |
| SJA Transport Ltd | Transport & logistics | 2023 |
| SJB Roofing Limited | Construction | 2023 |
| SJD Invest Ltd | Professional & scientific | 2023 |
| Sjgw Associates Ltd | Information & communication | 2014 |
| SJJ Property and Investments Limited | Real estate | 2000 |
| SJL Futures Ltd | Information & communication | 2026 |
| SJL Guttering Ltd | Construction | 2018 |
| SJM Property Management Limited | Real estate | 2002 |
| Sjmp Properties Ltd | Real estate | 2025 |
| SJR Land Investments Limited | Real estate | 2020 |
| SJS Resourcing Ltd | Administrative & support | 2015 |
| SJS Site Services Ltd | Construction | 2020 |
| SK Fire Safety Consulting Ltd | Professional & scientific | 2003 |
| SK Mart Ltd | Wholesale & retail | 2026 |
| SK Sporting Limited | Agriculture & fishing | 2020 |
| Skair Ltd | Manufacturing | 2023 |
| Skate Pharm Limited | Wholesale & retail | 2020 |
| Skeete Farms Limited | Agriculture & fishing | 1996 |
| Skill Builders Surrey Ltd | Construction | 2022 |
| Skin Lumina Ltd | Other services | 2011 |
| Skin Serenity Clinic Ltd | Other services | 2024 |
| Skin TEC Tattoo Ltd | Other services | 2012 |
| Skinners & Hulks Electrical Ltd | Construction | 2011 |
| Skippers EN Ltd | Hospitality | 2023 |
| Skippers Estate Agents Limited | Real estate | 2023 |
| SKR Building Contractors Limited | Construction | 2025 |
| Skreppa Horses CIC | Agriculture & fishing | 2021 |
| Skullyz Apparel Ltd | Wholesale & retail | 2025 |
| Sky-High Ropeaccess Ltd | Construction | 2021 |
| Skyblue Systems Ltd | Professional & scientific | 2021 |
| Skybrox Coaching Ltd | Arts & recreation | 2026 |
| Skycare Repatriation Ltd | Transport & logistics | 2024 |
| Skye Cloud Limited | Information & communication | 2012 |
| Skyelark Security Limited | Administrative & support | 2023 |
| Skyfleet Limited | Financial services | 1997 |
| Skylab BIO Ltd | Professional & scientific | 2017 |
| Skylimit Construction Ltd | Construction | 2024 |
| Skyline Joicozee Limited | Health & social care | 2018 |
| Skyline Management Limited | Construction | 2014 |
| Skyline Medical Ltd | Administrative & support | 2024 |
| Skyline Pilates Ltd | Arts & recreation | 2026 |
| Skyline Transport Solutions Limited | Transport & logistics | 2024 |
| SL42SY Ltd | Real estate | 2021 |
| Slendertone Limited | Extraterritorial | 2003 |
| Slick Automations Ltd | Information & communication | 2025 |
| Sljp Ventures Limited | Hospitality | 2024 |
| SLM IT Contracting Ltd | Information & communication | 2011 |
| SLM Waste Management Limited | Water & waste | 2020 |
| Sloth & Spoon Ltd | Manufacturing | 2024 |
| SLS - Second Life Solutions (UK) Limited | Wholesale & retail | 2025 |
| Slss Services Ltd | Information & communication | 2023 |
| Slumber Boutique Ltd | Professional & scientific | 2019 |
| SLZ Locums Ltd | Health & social care | 2020 |
| SM Building & Decorating Ltd | Construction | 2023 |
| Smallogic Ltd | Real estate | 2024 |
| Smarden Storage Ltd | Administrative & support | 2025 |
| Smart & Fashion Ltd | Other services | 2025 |
| Smart Assets UK Ltd | Real estate | 2016 |
| Smart Brickwork Ltd | Construction | 2022 |
| Smart Developments (LDN) Ltd | Construction | 2023 |
| Smart H&P Solutions Ltd | Construction | 2020 |
| Smart Look Roofing Ltd | Construction | 2026 |
| Smart Property World Ltd | Construction | 2024 |
| Smart Tech Gadgets Ltd | Wholesale & retail | 2023 |
| Smart-Tilt Ltd. | Wholesale & retail | 2024 |
| Smart/Casual Ltd | Information & communication | 2013 |
| Smartedge Marketing Limited | Professional & scientific | 2008 |
| Smarter Mortgages (South East) Limited | Financial services | 2020 |
| Smartfin Consulting Ltd | Professional & scientific | 2025 |
| Smartim Ltd | Professional & scientific | 2020 |
| Smartpiggy Limited | Administrative & support | 2008 |
| Smash & Shake Platform Ltd | Hospitality | 2025 |
| Smeeth Sandpit Preservation Limited | Real estate | 2013 |
| Smetj Limited | Health & social care | 2023 |
| Smile Studio Ashford Ltd | Health & social care | 2022 |
| Smile Wholsaler Ltd | Wholesale & retail | 2019 |
| Smileie Limited | Manufacturing | 2023 |
| Smiles and Bliss Ltd | Information & communication | 2019 |
| Smilodon Properties Ltd | Construction | 2025 |
| Smith and Mercer Interiors Limited | Wholesale & retail | 2011 |
| Smjr Construction & SON Limited | Construction | 2019 |
| Smockmill Limited | Professional & scientific | 2013 |
| Smokey Mountain Properties Ltd | Real estate | 2023 |
| Smoothtransport Ltd | Transport & logistics | 2025 |
| SMR Services Limited | Wholesale & retail | 2025 |
| SMS Specialist Recruitment Limited | Administrative & support | 2002 |
| SN Caterers Ltd | Hospitality | 2023 |
| SN Hand Car Wash Ltd | Other services | 2026 |
| Snab Lettings Ltd | Real estate | 2025 |
| Snap Drape Europe Limited | Manufacturing | 2016 |
| Snap Drape Limited | Manufacturing | 2024 |
| Snapdragon Projects Limited | Professional & scientific | 2026 |
| Snappyapple Ltd | Other services | 2017 |
| Snapstic UK Limited | Professional & scientific | 2023 |
| Snigsan Ltd | Real estate | 2025 |
| Snow Eyecare Limited | Wholesale & retail | 2002 |
| Snow White Properties Limited | Professional & scientific | 1972 |
| Snowy's Canine Therapy Centre Limited | Other services | 2016 |