| Star Investment Group Limited | Real estate | 2019 |
| Star Lotus Ltd | Administrative & support | 2020 |
| Star Luton Builder Limited | Construction | 2016 |
| Star MK Limited | Real estate | 2017 |
| Star Network Limited | Transport & logistics | 2021 |
| Star Printers and Publishers UK Limited | Information & communication | 1987 |
| Star Tippers Ltd | Transport & logistics | 2024 |
| STAR22 Ltd | Health & social care | 2015 |
| Starbuy-Uk Ltd | Wholesale & retail | 2014 |
| Starcleantd Ltd | Transport & logistics | 2020 |
| Starforce Limited | Transport & logistics | 2020 |
| Starline Auto Ltd | Wholesale & retail | 2024 |
| Starling Ride Limited | Transport & logistics | 2026 |
| Starlink Business Solutions Ltd | Information & communication | 2024 |
| Starlink Motors Limited | Wholesale & retail | 2024 |
| Stars Taxis Ltd | Transport & logistics | 2022 |
| Start Smart Driving School Ltd | Education | 2025 |
| Start Smart Tuition (Luton) Ltd | Education | 2022 |
| Starynx LP | | 2022 |
| Stately Court Management Company Limited | Households | 1989 |
| Statemeant Limited | Wholesale & retail | 2014 |
| Statement Antiques & Interiors Limited | Wholesale & retail | 2023 |
| Statim Healthcare Ltd | Health & social care | 2012 |
| Station View Lodge Limited | Real estate | 2025 |
| Status Scaffolding Ltd | Construction | 2020 |
| Staunch Recruitment Solutions Ltd | Administrative & support | 2021 |
| Stavros Ulysses Ltd | Professional & scientific | 2023 |
| Stawarz Limited | Real estate | 2024 |
| Stay Connected Limited | Wholesale & retail | 2012 |
| Stay Silent Tech Ltd | Information & communication | 2026 |
| Stay Young Network LLP | | 2025 |
| Stayest Limited | Real estate | 2026 |
| Staying Secret Ltd | Real estate | 2023 |
| Staysafe-Cctv Limited | Administrative & support | 2022 |
| Stayua Limited | Real estate | 2025 |
| Stbk Trading Ltd | Wholesale & retail | 2025 |
| Steadfast Landscaping Limited | Administrative & support | 2013 |
| Steak & Smash Ltd | Hospitality | 2025 |
| Steak Stop Ltd | Hospitality | 2025 |
| Stealth Kitchen Ltd | Hospitality | 2025 |
| Steam Clean Carpets Ltd | Administrative & support | 2025 |
| Steel Kamet Limited | Extraterritorial | 2022 |
| Steelboxcity Holdings Limited | Financial services | 2025 |
| Steelcon Limited | Professional & scientific | 2021 |
| Steele Trading Corporation Ltd | Transport & logistics | 2019 |
| Steelwright Ltd | Construction | 2021 |
| Stef & Stan Ltd | Other services | 2014 |
| Stef MD Ltd | Construction | 2017 |
| Stef Romana Ltd | Wholesale & retail | 2022 |
| Stef Sorinel Ltd | Transport & logistics | 2024 |
| Steffi's Care Ltd | Health & social care | 2022 |
| Stegwiesen Project Developement Ltd | Construction | 2024 |
| Stellar Maintenance Services Ltd | Administrative & support | 2024 |
| Stellar Supply Ltd | Wholesale & retail | 2026 |
| Stemclub Ltd | Education | 2015 |
| Step Line Ltd | Transport & logistics | 2015 |
| Step to Miles Ltd | Transport & logistics | 2023 |
| Stephen Fuller Ltd | Administrative & support | 2024 |
| Stephen Gill Plant Sales Limited | Wholesale & retail | 2024 |
| Stephens Haulage Holdings Limited | Professional & scientific | 2014 |
| Stephenson Court Headlease Interest Limited | Households | 2023 |
| Stepping Stones (Luton) | Other services | 2008 |
| Stepwise Mortgages Ltd | Other services | 2017 |
| Sterling Consultancy Solutions Ltd | Professional & scientific | 2013 |
| Sterling Knight Investments Ltd | Professional & scientific | 2026 |
| Sterling Motors & Transport Ltd | Wholesale & retail | 2025 |
| Sterling Nexus Limited | Wholesale & retail | 2024 |
| Sterling Sketch Ltd | Manufacturing | 2024 |
| Sterlingtrans Ltd | Transport & logistics | 2019 |
| Steve Champion Services Ltd | Construction | 2025 |
| Steve Coulter Plumbing & Heating Ltd | Construction | 2025 |
| Stevenage Cars Limited | Wholesale & retail | 2015 |
| Stevenage Family Butchers Limited | Wholesale & retail | 2010 |
| Stevenage Food Limited | Hospitality | 2025 |
| Stewardship Capital Ltd | Professional & scientific | 2018 |
| Stewie’S Scooters Ltd | Wholesale & retail | 2025 |
| STF Logistics Limited | Wholesale & retail | 2021 |
| Stify Ltd | Wholesale & retail | 2024 |
| Stirling Driving Ltd | Education | 2024 |
| STK Logistics Limited | Transport & logistics | 2016 |
| Stmm Advanced Solutions Limited | Professional & scientific | 2019 |
| Stock 67 Ltd | Information & communication | 2014 |
| Stockdale Martin Ltd | Professional & scientific | 2002 |
| Stockdale Martin Trustee Limited | Extraterritorial | 2024 |
| Stockgate IP Ltd | Real estate | 2025 |
| Stockingstone Estates Ltd | Financial services | 2021 |
| Stockwood Estates Ltd | Real estate | 2026 |
| Stockwood Maktab Limited | Education | 2025 |
| Stockwood Osteopaths Ltd. | Health & social care | 2017 |
| Stockwood Park Rugby Football Club Limited | Arts & recreation | 1981 |
| Stockwoods Wholesale Ltd | Wholesale & retail | 2023 |
| Stogin Electrician Limited | Construction | 2025 |
| Stomio Limited | Health & social care | 2024 |
| Stone Empire Ltd | Other services | 2011 |
| Stone Investment Solutions Ltd | Administrative & support | 2026 |
| Stone Paving Solutions Ltd | Administrative & support | 2020 |
| Stonebank Construction Ltd | Construction | 2023 |
| Stonecraft Pave Drives & Patios Ltd | Construction | 2018 |
| Stonecross Ltd | Real estate | 2015 |
| Stonecross Paving Ltd | Construction | 2014 |