| Starock Limited | Hospitality | 2013 |
| Starr Blue Group Limited | Administrative & support | 2020 |
| Stars Developments Ltd | Construction | 2026 |
| Stars Infinity Ltd | Wholesale & retail | 2021 |
| Starsafe Care Limited | Administrative & support | 2020 |
| Start for Life Limited | Health & social care | 2019 |
| Start for Life Properties Limited | Real estate | 2025 |
| Starting Point London Ltd | Administrative & support | 2018 |
| Startupp Limited | Financial services | 2024 |
| Staske Construction Limited | Real estate | 1993 |
| Stat-U-Like Ltd | Information & communication | 2005 |
| State Side Jerseys Ltd | Wholesale & retail | 2026 |
| Statleague Ltd | Arts & recreation | 2023 |
| Status Building Ltd | Construction | 2019 |
| Staughton Estate Management Ltd | Administrative & support | 2026 |
| Staughton Moor Properties Limited | Construction | 2004 |
| STC Flooring Ltd | Construction | 2025 |
| Steadfast Residential Ltd | Real estate | 2024 |
| Steadfast (S&E) Holdings Limited | Construction | 2018 |
| Steadfast Motor Company Limited | Manufacturing | 2019 |
| Steadfast Properties Limited | Construction | 1989 |
| Steadfast Property Limited | Real estate | 2018 |
| Steadfast Refurb Ltd | Construction | 2019 |
| Steadfast Roofing (S & E) Limited | Construction | 2013 |
| Steadfast Roofing Holdings Limited | Construction | 2018 |
| Steadfast Roofing Oxon Limited | Construction | 2019 |
| Steefane Ltd | Professional & scientific | 2009 |
| Steel Rhino Technologies Ltd | Manufacturing | 2021 |
| Steelco Construction MK Ltd | Construction | 2024 |
| Steelpin Limited | Information & communication | 2022 |
| Steers Media Ltd | Information & communication | 2023 |
| Stef&L Limited | Construction | 2017 |
| Stefanella Limited | Financial services | 2023 |
| Stefrom Limited | Construction | 2015 |
| Steli Building Ltd | Construction | 2017 |
| Stellar Building Consultancy Limited | Professional & scientific | 2007 |
| Stellco Developments Limited | Real estate | 2000 |
| Stellco Land Limited | Real estate | 2021 |
| Stellco Lenborough Park Limited | Construction | 2015 |
| Stellwagen Equity Partners Limited | Financial services | 2025 |
| Stellwagen Ventures Limited | Professional & scientific | 2020 |
| Stencel Precision Limited | Manufacturing | 2012 |
| Stencel Properties Limited | Real estate | 2023 |
| Step Down Care Limited | Public administration | 2022 |
| Step Fresh Ltd | Administrative & support | 2025 |
| Step-Paside Ltd | Transport & logistics | 2022 |
| Stepchange Consulting Ltd | Information & communication | 2025 |
| Stephen Hartwell Limited | Health & social care | 2010 |
| Stephen Oakey Limited | Administrative & support | 2019 |
| Stephenson Court (Bedford) Management Company Limited | Real estate | 2013 |
| Steptoes Cart Limited | Water & waste | 2022 |
| Stepuc Ltd | Wholesale & retail | 2023 |
| Sterling Atlantic Ltd | Wholesale & retail | 2014 |
| Sterling Development Management Limited | Professional & scientific | 1994 |
| Sterling Logistics Ltd | Transport & logistics | 2013 |
| Steve Hardy Engineering Limited | Professional & scientific | 2012 |
| Steve Hilliard Ampthill Limited | Other services | 2019 |
| Steve Hilliard Hairdressing Limited | Other services | 2004 |
| Steve Hilliard Salon Coaching Limited | Other services | 2017 |
| Steve Hopkins Flooring Ltd | Construction | 2018 |
| Steve LEE Trading Limited | Wholesale & retail | 2020 |
| Steve M Morris Limited | Other services | 2016 |
| Steve Nichols Building Services Ltd | Construction | 2018 |
| Stevenson Consulting Limited | Information & communication | 2023 |
| Stevenson UK Limited | Arts & recreation | 2003 |
| Stevenson's (Beers & Wines) Limited | Professional & scientific | 1994 |
| Stewartby Property Holdings Limited | Real estate | 2026 |
| Stewartby Water Sports Club Limited | Arts & recreation | 1971 |
| Stewarts International Ltd | Wholesale & retail | 2021 |
| STG (Holdings) Ltd | Transport & logistics | 2011 |
| STG (Projects) Ltd | Transport & logistics | 2010 |
| STI Cazzi Limited | Hospitality | 2022 |
| Sticky Rock Limited | Information & communication | 2012 |
| Stidston Limited | Information & communication | 2021 |
| Stillpoint Global Advisors Limited | Professional & scientific | 2026 |
| Stimpsons Estates Ltd | Real estate | 2023 |
| Stimpsons Eves Limited | Real estate | 2008 |
| Stinovintage Enterprises Ltd | Health & social care | 2015 |
| Stitch That - Print That Limited | Manufacturing | 2012 |
| Stj-Properties Ltd | Construction | 2023 |
| Stodden Capital Limited | Extraterritorial | 2009 |
| Stoic Health Ltd | Health & social care | 2026 |
| Stoke Mill Trading Ltd | Real estate | 2020 |
| Stonbury (Holdings) Limited | Financial services | 2016 |
| Stonbury Limited | Construction | 1983 |
| Stone Circle Property Ltd | Real estate | 2023 |
| Stone Cleaning Specialist Limited | Construction | 2013 |
| Stone Cookers Ltd | Manufacturing | 2021 |
| Stone Crow Tattoo Studio Limited | Other services | 2016 |
| Stone Developments Bedfordshire Ltd | Construction | 2021 |
| Stone Flower Developments Limited | Construction | 2023 |
| Stone Transformation Limited | Other services | 2023 |
| Stoneborough Finance Limited | Financial services | 2022 |
| Stonebridge Barn Property Limited | Real estate | 2022 |
| Stonebridges Printers Limited | Manufacturing | 1956 |
| Stonefield Care Ltd | Health & social care | 2026 |
| Stonefield Land and Development Limited | Construction | 2024 |
| Stoneleigh Group Holdings Ltd | Financial services | 2026 |
| Stoneleigh Property Management Ltd | Real estate | 2026 |
| Stonemont Partners Limited | Administrative & support | 2024 |