| Sterling DCS Limited | Information & communication | 2016 |
| Sterling Ride Limited | Transport & logistics | 2025 |
| Sterling Timber & Damp Limited | Construction | 2014 |
| Sterling Water Hygiene Ltd | Professional & scientific | 2026 |
| Steve Dobbs Ltd | Financial services | 2023 |
| Steve Fletcher Creative Ltd | Professional & scientific | 2025 |
| Steve Kent Limited | Construction | 2002 |
| Steve P Bennett Limited | Wholesale & retail | 2011 |
| Steve Sells Games Ltd | Wholesale & retail | 2026 |
| Steward Builder Limited | Construction | 2011 |
| Sticky and Sweet Cupcake Co Ltd | Other services | 2016 |
| Stimpsons Gpdb Limited | Administrative & support | 2021 |
| Stinky Kitten Limited | Information & communication | 2010 |
| Stitch Xpress Ltd | Other services | 2012 |
| Stkn Capital Limited | Real estate | 2021 |
| Stkn Limited | Information & communication | 2014 |
| Stock Harvard Limited | Administrative & support | 2001 |
| Stocks Lane Management Company Limited | Households | 2023 |
| Stocks Sports Limited | Arts & recreation | 2014 |
| Stockton & Green Ltd | Extraterritorial | 2018 |
| Stone Mixed Martial Arts Ltd | Arts & recreation | 2016 |
| Stone Pine Electrical Limited | Construction | 2019 |
| Stone Wolf Mining Limited | Mining & quarrying | 2024 |
| Stonebond Group Limited | Financial services | 2020 |
| Stonebond Northwood (Herne Bay) Residents Management Company Limited | Households | 2023 |
| Stonebond Properties (Birmingham) Limited | Construction | 2021 |
| Stonebond Properties (Chelmsford) Limited | Construction | 2005 |
| Stonebond Properties (Guildford) Limited | Construction | 2021 |
| Stonebond Properties (Manchester) Limited | Construction | 2022 |
| Stonebond Properties (Newgatestreet Road) Residents Management Company Limited | Households | 2021 |
| Stonebond Properties (Sevenoaks) Limited | Construction | 2020 |
| Stonebond Properties (ST Albans) Limited | Construction | 2020 |
| Stonebond Properties Chelmsford (Nominees) Limited | Real estate | 2023 |
| Stonebond Waterbeach (East Building) Residents Management Company Limited | Households | 2022 |
| Stonebridge Mass Limited | Other services | 2011 |
| STONECARE4U Limited | Wholesale & retail | 2016 |
| Stonecarp Limited | Professional & scientific | 2023 |
| Stonechart Property Holdings Limited | Financial services | 2025 |
| Stonechart Property Limited | Real estate | 1986 |
| Stoneridge Residential Limited | Real estate | 2016 |
| Stoneycroft Management Company Limited | Households | 1993 |
| Stoq Group Holdings Limited | Wholesale & retail | 2022 |
| Store IT Maldon Limited | Administrative & support | 2021 |
| Store Station Limited | Real estate | 2024 |
| Storm and Sons Ltd | Administrative & support | 2021 |
| Storm Group Investments (Briscoe Road) Limited | Real estate | 2023 |
| Storm Group Investments Limited | Real estate | 2015 |
| Storm Group Services Limited | Construction | 2007 |
| Storm Holdings Limited | Real estate | 2006 |
| Storm Lighting Solutions Limited | Professional & scientific | 2004 |
| Storm Zero Limited | Construction | 2001 |
| Stormmq IT Limited | Administrative & support | 2014 |
| Stormmq Limited | Information & communication | 2010 |
| Stortford Furniture Limited | Wholesale & retail | 2007 |
| Story Detectives Ltd | Education | 2026 |
| Stour Automotive Ltd | Transport & logistics | 2020 |
| Stour Marine Limited | Information & communication | 2006 |
| Stow Maries Great WAR Aerodrome Ltd | Arts & recreation | 2011 |
| Stowmarket Caravan Sales Limited | Wholesale & retail | 1954 |
| Stowmarket Fitness Ltd | Arts & recreation | 2023 |
| Stowupland (Stowmarket) Managing Company Limited | Professional & scientific | 2019 |
| Strachan (Stock) Limited | Real estate | 1958 |
| Straight PR Limited | Professional & scientific | 2007 |
| Straight to Source Imports Limited | Wholesale & retail | 2010 |
| Strategic Financial Consulting Ltd | Financial services | 2011 |
| Strategic Network Consulting Limited | Information & communication | 1997 |
| Strategic Sales Ltd | Professional & scientific | 2021 |
| Strategic Ventures Ltd | Professional & scientific | 2021 |
| Strategix Developments Limited | Construction | 2026 |
| Strategix Holdings Limited | Financial services | 2026 |
| Stratele Ltd | Professional & scientific | 2021 |
| Stratford Grange Management Company Limited | Households | 2001 |
| Stratifi Solutions Ltd | Information & communication | 2025 |
| Stratiq Limited | Professional & scientific | 2016 |
| Stratum 7 Limited | Information & communication | 2016 |
| Stratus Enterprise Ltd | Wholesale & retail | 2026 |
| Stratus Excel Limited | Education | 2015 |
| Strawberry Oak Limited | Financial services | 2017 |
| Strawhouse Partnerships Ltd | Construction | 2024 |
| Streams Investments Limited | Real estate | 1986 |
| Street Eats and Beats (Essex) Limited | Arts & recreation | 2024 |
| Street Foods Direct Ltd | Hospitality | 2022 |
| Street Pest Control Limited | Administrative & support | 2025 |
| Streetfood Helping to Feed the Homeless Within OUR Community CIC | Hospitality | 2022 |
| Stress Free Electrical Limited | Construction | 2009 |
| Strive Agency Limited | Professional & scientific | 2020 |
| Structural Repair Solutions (SRS) Ltd | Construction | 2016 |
| Structured Consultancy Services Limited | Professional & scientific | 2020 |
| Strutt and Parker (Farms) Limited | Agriculture & fishing | 1918 |
| Struxsion Limited | Professional & scientific | 2023 |
| Stuart & Sons Bathroom Installations Ltd | Construction | 2018 |
| Stuart Davis Limited | Agriculture & fishing | 1998 |
| Stuart J Parker Solutions Ltd | Professional & scientific | 2015 |
| Stubbers Adventure Centre | Education | 1996 |
| Stubbers Training Limited | Education | 1999 |
| Stubbings Food and Beverage Holdings Limited | Hospitality | 2019 |
| Stubbings Holdings Limited | Extraterritorial | 2019 |
| Stubbings Investment Holdings Limited | Real estate | 2019 |
| Stubbings Land Development Limited | Construction | 2019 |
| Student Equip Laboratories and Consultancy Services Ltd | Wholesale & retail | 2025 |