| Star Building Work Limited | Construction | 2025 |
| Star Citizen SH Limited | Wholesale & retail | 2025 |
| Star Drilling Fluids Ltd | Wholesale & retail | 2026 |
| Star Financial Services Limited | Administrative & support | 2019 |
| Star Fitters Ltd | Professional & scientific | 2013 |
| Star Footwear Ltd | Wholesale & retail | 2025 |
| Star Glazing Windows Ltd | Manufacturing | 2023 |
| Star Lofts Ltd | Construction | 2021 |
| Star Motors Group Ltd | Wholesale & retail | 2019 |
| Star Truck Ltd | Transport & logistics | 2025 |
| Stardust Associates Limited | Real estate | 2024 |
| Stardust Homes Ltd | Professional & scientific | 2025 |
| Starknightuk Ltd | Extraterritorial | 2024 |
| Starktek Ltd | Wholesale & retail | 2020 |
| Starlet Letting and Maintenance Ltd | Real estate | 2025 |
| Starlight Accountancy Ltd | Professional & scientific | 2024 |
| Starlight Care and Support Services Ltd | Health & social care | 2023 |
| Starlight Event & Wedding Planner Ltd | Hospitality | 2023 |
| Starlight M.D Property Limited | Real estate | 2023 |
| Starling Trading Limited | Wholesale & retail | 2021 |
| Starlink Transport Ltd | Transport & logistics | 2018 |
| Starting My Business Limited | Wholesale & retail | 2023 |
| Startray Ltd | Construction | 2026 |
| Stash Family Ltd | Wholesale & retail | 2017 |
| Station Grocery Limited | Wholesale & retail | 2024 |
| Staunton Property Management Limited | Hospitality | 2006 |
| Stay on Your Feet Podcast Ltd | Professional & scientific | 2025 |
| Staycharged Limited | Administrative & support | 2022 |
| Stayput Construction Services Limited | Construction | 1997 |
| Staytus Limited | Wholesale & retail | 2023 |
| Steam DRY Cleaners Ltd | Other services | 2018 |
| Steez Estates Ltd | Real estate | 2025 |
| Stefan D Limited | Construction | 2016 |
| Stefan RUS Ltd | Construction | 2025 |
| Stefanescu BOB Building Services Ltd | Construction | 2017 |
| Stelena Goods Ltd | Wholesale & retail | 2025 |
| Stella Elite Healthcare Service Limited | Professional & scientific | 2015 |
| Stella-Nifio Limited | Health & social care | 2014 |
| Stellagua Ltd | Health & social care | 2012 |
| Stely's Food Ltd | Hospitality | 2023 |
| Stem Education for Kids CIC | Education | 2026 |
| Step One Consultancy Ltd | Education | 2019 |
| Stephin Developments Ltd | Construction | 2022 |
| Sterling Learning Education Limited | Education | 2025 |
| Sterling Nova Ltd | Wholesale & retail | 2025 |
| Sterling Partnerz Ltd | Administrative & support | 2025 |
| Sterling Properties and Consultancy Ltd | Real estate | 2020 |
| STES98 Limited | Construction | 2016 |
| Steven Stockdale Limited | Wholesale & retail | 2024 |
| Steward Construction Ltd | Financial services | 2021 |
| STG Water Desalination and Membrane Treatment Technologies Ltd | Water & waste | 2023 |
| STH Consultants Ltd | Wholesale & retail | 2017 |
| Stick Social Ltd | Other services | 2024 |
| Stilfixggo Limited | Construction | 2023 |
| Still Wellness Ltd | Manufacturing | 2019 |
| Stirling Learning Solutions Ltd | Education | 2016 |
| Stirrersandshakers Ltd | Hospitality | 2012 |
| STK Motors Ltd | Wholesale & retail | 2026 |
| Stockwell Group Ltd | Other services | 2022 |
| Stokalii Ltd | Wholesale & retail | 2023 |
| Stone Hunters Ltd | Construction | 2026 |
| Stone London Limited | Other services | 2011 |
| Stonewave Constructiion Limited | Construction | 2025 |
| Storeworth Ltd | Wholesale & retail | 2025 |
| Storm Productions Jehovah Nisi Ltd | Manufacturing | 2025 |
| STQ Auto Ltd | Education | 2024 |
| Strata Environmental Group Ltd | Administrative & support | 2026 |
| Strategic Centre for Pakistan Globalisation (Scfpg) Ltd | Professional & scientific | 2025 |
| Stratetech IT Ltd | Information & communication | 2025 |
| Stratford Labour Hire Limited | Administrative & support | 1994 |
| Stratify AI Ltd | Information & communication | 2025 |
| Stratum One Limited | Wholesale & retail | 2025 |
| Streamline Builders Ltd | Construction | 2024 |
| Streamline Security Limited | Administrative & support | 2022 |
| Streams Concept Ltd | Education | 2019 |
| Streetfeast Hub Ltd | Hospitality | 2025 |
| Streetlove UK Limited | Other services | 2020 |
| Stress 3 Catering Limited | Hospitality | 2016 |
| Stride Visa and Immigration Services Ltd | Professional & scientific | 2025 |
| Strivex Ventures Ltd | Wholesale & retail | 2025 |
| Strm Services Ltd | Wholesale & retail | 2024 |
| Stroop Services Ltd | Administrative & support | 2025 |
| Structural Expert Limited | Construction | 2011 |
| STS Removals Ltd | Transport & logistics | 2012 |
| Studentklick Ltd | Wholesale & retail | 2015 |
| Studi's Global Limited | Education | 2024 |
| Studio Humano Ltd | Professional & scientific | 2022 |
| Studio Segment Ltd | Professional & scientific | 2025 |
| Studio Selss Ltd | Wholesale & retail | 2024 |
| Study Buddies Tuition Limited | Education | 2013 |
| Sturge Productions Limited | Arts & recreation | 2017 |
| Style & Beauty Parlour Ltd | Other services | 2019 |
| Style and Fashion Wholesalers Limited | Wholesale & retail | 2019 |
| Styler Street Limited | Wholesale & retail | 2018 |
| Suap Search Ltd | Administrative & support | 2018 |
| Suave Fashion Limited | Wholesale & retail | 2019 |
| Subhash Chand Limited | Construction | 2025 |
| Success Care Services Ltd | Health & social care | 2013 |
| Success Social Care Ltd | Health & social care | 2018 |
| Success Weaver Ltd | Education | 2025 |