| Step Support Services Ltd | Administrative & support | 2021 |
| Step TA Limited | Financial services | 2011 |
| STEP4YOU Ltd | Health & social care | 2015 |
| Stephanie Kamio Limited | Other services | 2009 |
| STEPS2QUALITY Ltd | Health & social care | 2018 |
| Sterling 3000 Limited | Real estate | 2011 |
| Sterling Accountancy Limited | Professional & scientific | 2018 |
| Sterling Global Finance Limited | Financial services | 2025 |
| Sterling Haven Property Investments Limited | Real estate | 2020 |
| Sterling Investments (Croydon) Limited | Manufacturing | 1997 |
| Sterling Joinery London Limited | Manufacturing | 2013 |
| Sterling Property Co. (Croydon) Limited | Real estate | 1963 |
| Sterling Search Recruitment Services Limited | Administrative & support | 2023 |
| Sterlingbridge Finance Limited | Financial services | 2017 |
| Sterlingbridge Holdings Limited | Financial services | 2017 |
| Sterlingbridge Investment Group Limited | Financial services | 2017 |
| Sterlingbridge Properties Limited | Construction | 2017 |
| Sterlingbridge Property Development Group Limited | Financial services | 2017 |
| Sterlingbridge Property Development Limited | Construction | 2017 |
| Sterlingbridge Property Group Limited | Financial services | 2017 |
| Steror Homes Ltd | Real estate | 2024 |
| Steve Autos Ltd | Wholesale & retail | 2015 |
| Steve COE Services Limited | Construction | 2016 |
| Steve Drysdale Ltd | Professional & scientific | 2013 |
| Steve Frieze Removals Ltd | Transport & logistics | 2010 |
| Steve Parrish Racing Limited | Professional & scientific | 2014 |
| Steve Tree Consulting Ltd | Administrative & support | 2022 |
| Steve Wilson Financial Services Limited | Financial services | 2012 |
| Steven Dennis Hardy Limited | Administrative & support | 2024 |
| Steven Michael Barrett Limited | Extraterritorial | 2025 |
| Stevens and Gill Bodycraft Limited | Wholesale & retail | 2015 |
| Stevens Court RTM Company Ltd | Households | 2019 |
| Stevie B Style Limited | Professional & scientific | 2010 |
| Stevieyip Ltd | Professional & scientific | 2023 |
| Stewart & Stewart Plumbing & Heating Limited | Construction | 2012 |
| Sthira Inc Ltd | Construction | 2013 |
| STI Travel International Ltd | Administrative & support | 2006 |
| Stiller Consultancy Limited | Information & communication | 2016 |
| Stillsoft Limited | Agriculture & fishing | 2025 |
| Stiltplan Limited | Households | 1981 |
| Stir My Soul (Media) Limited | Information & communication | 2023 |
| Stirling Mansions (NW6) Freehold Limited | Households | 2011 |
| Stock Clearance Lines Ltd | Wholesale & retail | 2020 |
| Stock Hill Medical Services Limited | Health & social care | 2013 |
| Stock Take Online Ltd | Information & communication | 2013 |
| Stockmoor Village (Area 6) Management Company Limited | Households | 2008 |
| Stockton Heath Healthcare LLP | | 2011 |
| Stokeleigh Lodge Retirement Home Limited | Health & social care | 1990 |
| Stokes Manor (Leyland) Management Company Limited | Households | 2017 |
| Stonco Limited | Real estate | 2021 |
| Stone Unisex Salon Ltd | Other services | 2023 |
| Stonebridge Arnold Ltd | Professional & scientific | 2024 |
| Stonecroft Building Services Limited | Construction | 1996 |
| Stonecross Sandbach Management Company Limited | Households | 2000 |
| Stonegate House Bradford Limited | Households | 2004 |
| Stoneham Place Management Limited | Households | 2008 |
| Stonehaven Management Company (Beckenham) Limited | Households | 1979 |
| Stonehenge Boyle Co Ltd | Real estate | 2020 |
| Stonehenge Home Renovation Ltd | Construction | 2025 |
| Stonehills Mansions Residents Association Limited | Households | 1985 |
| Stoneleigh (Birdhurst Rise) Management Limited | Households | 2003 |
| Stoneleigh Court Company Limited | Households | 1976 |
| Stonetip Ltd | Wholesale & retail | 2019 |
| Stoneyard Management Company Limited | Households | 2001 |
| Stonham Barns Carp Lodges Ltd | Arts & recreation | 2021 |
| Stop and Shop Group Limited | Real estate | 2016 |
| Stopflame Technology Ltd | Public administration | 2025 |
| Stoph & Co Limited | Hospitality | 2020 |
| Stopher Chauffeur Services Ltd | Transport & logistics | 2010 |
| Stopsley Fish and Grill Ltd | Hospitality | 2025 |
| Storbrook Limited | Transport & logistics | 2000 |
| Storm Rope Access Limited | Construction | 2014 |
| Story Stream Echoes of Success Ltd | Professional & scientific | 2024 |
| Story Time With Angel Limited | Wholesale & retail | 2025 |
| Stott Wharf Management Company Limited | Households | 2005 |
| Stowford Retreats Limited | Hospitality | 2021 |
| Strada Football Ltd | Arts & recreation | 2025 |
| Straight Edge Manufacturing Ltd. | Manufacturing | 1999 |
| Strand by Strand Limited | Other services | 2002 |
| Strand Motor Company Limited | Wholesale & retail | 2010 |
| Strand Preservation Limited | Construction | 1989 |
| Strandz by DEE Global Ltd | Other services | 2025 |
| Strandzbydee Limited | Other services | 2025 |
| Strata Land and Construction Ltd | Construction | 2019 |
| Strata Management Company (Swindon) Limited | Households | 2012 |
| Strata Shelters Limited | Real estate | 2025 |
| Stratavera Ltd | Information & communication | 2025 |
| Strategic Home Solutions Limited | Construction | 2025 |
| Strategic Vision Investments UK Limited | Professional & scientific | 2021 |
| Strategy and Operations Solutions Ltd | Professional & scientific | 2025 |
| Strathmore House Limited | Households | 1983 |
| Stratify Group Ltd | Wholesale & retail | 2026 |
| Stratus AI Ltd | Information & communication | 2025 |
| Stratus Air Conditioning Limited | Energy | 2020 |
| Stratuscore Ltd | Information & communication | 2025 |
| Strawberry Park (Whitby) Management Company Limited | Households | 2007 |
| Strawhouse Films Ltd | Arts & recreation | 2019 |
| Strdom Ltd | Wholesale & retail | 2018 |
| Stream Flux Ltd | Information & communication | 2025 |
| Streameats Group Ltd | Hospitality | 2025 |