| Steve Barber Wedding Photography Limited | Arts & recreation | 2018 |
| Stevenage Auto Centre Ltd | Wholesale & retail | 2023 |
| Stevenage Bait and Tackle Ltd | Wholesale & retail | 2021 |
| Stevenage Bathrooms Ltd | Construction | 2019 |
| Stevenage Bioscience Catalyst | Administrative & support | 2010 |
| Stevenage Capital Limited | Information & communication | 2025 |
| Stevenage Chiropractic Clinic Limited | Health & social care | 2019 |
| Stevenage Citizens Advice Bureau | Information & communication | 1999 |
| Stevenage Cleaning Services Ltd | Administrative & support | 2025 |
| Stevenage Cycling Hub Community Interest Company | Wholesale & retail | 2020 |
| Stevenage Display Group Limited | Professional & scientific | 2011 |
| Stevenage Driving School Ltd | Education | 2018 |
| Stevenage EA Limited | Real estate | 2018 |
| Stevenage Educational Trust | Education | 2008 |
| Stevenage Electrical Engineers Ltd | Construction | 2023 |
| Stevenage Embroidery Limited | Professional & scientific | 2011 |
| Stevenage Fabrication Limited | Manufacturing | 2003 |
| Stevenage Fast Food T/A Downtown Ltd | Hospitality | 2025 |
| Stevenage Food Suppliers Limited | Hospitality | 2022 |
| Stevenage Football Club Finance PLC | Financial services | 2017 |
| Stevenage Football Club Foundation Limited | Arts & recreation | 2010 |
| Stevenage Football Club Limited | Arts & recreation | 1994 |
| Stevenage Futsal Club CIC | Arts & recreation | 2025 |
| Stevenage Hospitality Group Limited | Hospitality | 2024 |
| Stevenage Innovation Circle CIC | Education | 2026 |
| Stevenage Insurance Services Limited | Financial services | 1979 |
| Stevenage Laundry Ltd | Other services | 2013 |
| Stevenage Lettings Limited | Real estate | 2014 |
| Stevenage Management Company Limited | Households | 2007 |
| Stevenage Motorcare Limited | Wholesale & retail | 2013 |
| Stevenage North PCN Ltd | Health & social care | 2024 |
| Stevenage Packaging Limited | Wholesale & retail | 1989 |
| Stevenage Peri Peri Chicken Limited | Hospitality | 2023 |
| Stevenage Pizza House Limited | Hospitality | 2025 |
| Stevenage Plant & Digger Hire Limited | Administrative & support | 2021 |
| Stevenage Plumber Ltd | Construction | 2024 |
| Stevenage Plumbing Supplies Limited | Wholesale & retail | 1981 |
| Stevenage Prestige Limited | Wholesale & retail | 2016 |
| Stevenage Property Services Ltd | Construction | 2025 |
| Stevenage Rugby Club Limited | Arts & recreation | 2015 |
| Stevenage Signs Limited | Professional & scientific | 2007 |
| Stevenage Snooker Club Limited | Administrative & support | 2020 |
| Stevenage Sporting Futures Team Limited | Education | 2013 |
| Stevenage Sports Injury and Coaching Clinic Limited | Arts & recreation | 2024 |
| Stevenage Spring Company Limited | Manufacturing | 1987 |
| Stevenage Steel Limited | Manufacturing | 2024 |
| Stevenage Tyres Limited | Manufacturing | 2023 |
| Stevenage Van Hire Limited | Administrative & support | 2013 |
| Stevenage Vapes Limited | Wholesale & retail | 2025 |
| Stevenage Your MAN With a Van Ltd | Transport & logistics | 2024 |
| Stevenge Plumbing and Decoration Ltd | Construction | 2026 |
| Stevens Data Science Consultants Ltd | Information & communication | 2024 |
| Stevies Ltd | Other services | 2011 |
| Stewart C Young Limited | Real estate | 2026 |
| Stewart Packaging Limited | Financial services | 2020 |
| Stibnite Moto Co Ltd | Wholesale & retail | 2025 |
| Stick and Chat Limited | Professional & scientific | 2017 |
| Still Property and Investment Ltd | Real estate | 2021 |
| Still Trades and Investment Ltd | Wholesale & retail | 2021 |
| Stimpsons Electrical Solutions Limited | Construction | 2021 |
| Stmn Properties Ltd | Real estate | 2023 |
| Stockbridge Road Management Company Limited | Households | 2012 |
| Stonebase Developments Ltd | Construction | 2025 |
| Stonebridge Management Services Limited | Professional & scientific | 1989 |
| Stonecrest Brickwork Ltd | Construction | 2026 |
| Stonegate Civils Ltd | Construction | 2021 |
| Stonepoint Limited | Construction | 2003 |
| Stoneshot Limited | Information & communication | 2001 |
| Storey & Holmes Contractors Ltd | Construction | 2023 |
| Storm Broadcast Limited | Administrative & support | 2008 |
| Storm Cosmetics Limited | Wholesale & retail | 2021 |
| Storm Garden and Grounds Services Limited | Households | 2023 |
| Stortford Daycare Limited | Health & social care | 2022 |
| Story Before Glory Ltd | Administrative & support | 2017 |
| Stour Valley Systems Ltd | Manufacturing | 2014 |
| Strac Properties Limited | Real estate | 2021 |
| Strachan Plastering Limited | Construction | 2008 |
| Strada Elite Tours Ltd | Administrative & support | 2026 |
| Strahan's Structured Cabling Limited | Information & communication | 2023 |
| Strata Cambridge Holdings Limited | Financial services | 2023 |
| Strata Decarbonisation Group Ltd | Construction | 2023 |
| Strata Insulated Renders Ltd | Construction | 2020 |
| Strata Solar Limited | Other services | 2023 |
| Strategic Boards Ltd | Administrative & support | 2023 |
| Strategy and More (Strand) Limited | Information & communication | 2024 |
| Strathmore Consultancy Services Limited | Professional & scientific | 2012 |
| Stratton Leasing Limited | Wholesale & retail | 2016 |
| Stratton Networks Group Limited | Information & communication | 2017 |
| Stratton Networks London Limited | Professional & scientific | 2016 |
| Stratton Networks Telecoms Ltd | Information & communication | 2024 |
| Stretched Marquees Ltd | Administrative & support | 2025 |
| Stridedean Limited | Real estate | 1983 |
| Stroke Action | Health & social care | 2001 |
| Strong Oak Properties Limited | Real estate | 2020 |
| Stronghold Dance Company Ltd | Education | 2023 |
| Structural Engineering Design Limited | Professional & scientific | 2003 |
| Structural Modelling Services Limited | Information & communication | 2007 |
| STS Training and Consultancy Limited | Education | 2016 |
| Stuart Brock Limited | Construction | 2003 |
| Student Quarters Limited | Real estate | 2021 |