| Sectionlift Limited | Extraterritorial | 2016 |
| Sectionlift UK Limited | Extraterritorial | 2017 |
| Sectorone Services Ltd | Transport & logistics | 2026 |
| Secure & Stability Holding Ltd. | Financial services | 2022 |
| Secure Caravan Parking Limited | Transport & logistics | 2008 |
| Secure Freight Limited | Transport & logistics | 2024 |
| Securitop Ltd | Administrative & support | 2024 |
| Security Automation Supplies Limited | Wholesale & retail | 2024 |
| SEDALB89 Ltd | Wholesale & retail | 2024 |
| Seddon Education Ltd | Education | 2024 |
| Seddon Group (Holdings) Ltd | Financial services | 2024 |
| SEE Engineering Ltd | Construction | 2018 |
| SEE IT Media Ltd | Professional & scientific | 2018 |
| Seen-Ra Consultancy Ltd | Professional & scientific | 2024 |
| Seez Limited | Arts & recreation | 2012 |
| Sefco Ltd | Health & social care | 2014 |
| Seif Haulage 4 U Ltd | Transport & logistics | 2024 |
| Sejahtera Limited | Financial services | 2006 |
| Sejd Supplies Limited | Wholesale & retail | 2009 |
| Sekhon & Sons Limited | Real estate | 2025 |
| Sela HCW Ltd | Other services | 2025 |
| Selah and Cactus Private Limited | Professional & scientific | 2022 |
| Selale 27 Limited | Hospitality | 2026 |
| Selamci Ltd | Extraterritorial | 2026 |
| Selbond Online Ltd | Wholesale & retail | 2020 |
| Select & Associates Ltd | Other services | 2018 |
| Select Aggregates Limited | Extraterritorial | 2017 |
| Select Alloys & Materials Limited | Manufacturing | 2000 |
| Select Alloys & Materials Properties Limited | Real estate | 2025 |
| Select Alloys Holdings Limited | Administrative & support | 2014 |
| Select Alloys Investments Limited | Administrative & support | 2014 |
| Select and Collect Ltd | Wholesale & retail | 2025 |
| Select Aroma Limited | Manufacturing | 2021 |
| Select Bedrooms Limited | Professional & scientific | 2011 |
| Select Electrical (GB) Limited | Construction | 2002 |
| Select Event Supplies Ltd | Arts & recreation | 2025 |
| Select Health and Safety Ltd | Professional & scientific | 2009 |
| Select Kitchens Limited | Professional & scientific | 2011 |
| Select Media Events Limited | Arts & recreation | 2017 |
| Select Motors Doncaster Ltd | Wholesale & retail | 2019 |
| Select Padel Ltd | Arts & recreation | 2025 |
| Select Professional Services Ltd | Transport & logistics | 2026 |
| Self Sufficient Social Ltd | Health & social care | 2022 |
| Sell Your Truck Ltd | Extraterritorial | 2023 |
| SEM Cargo Ltd | Transport & logistics | 2025 |
| Semjoncarpeting Limited | Manufacturing | 2025 |
| SEN Friends Group CIC | Administrative & support | 2025 |
| Send Limited | Transport & logistics | 2024 |
| Sendmelive Limited | Information & communication | 2011 |
| Seng LEE (HE) Limited | Hospitality | 2019 |
| Senior and Dickson Limited | Manufacturing | 1981 |
| Senior’S Soul Kitchen Ltd | Hospitality | 2026 |
| Senra Sanitary Limited | Wholesale & retail | 2025 |
| Sense Company Scent Marketing Ltd | Wholesale & retail | 2025 |
| Sensory Footsteps Limited | Health & social care | 2022 |
| Senspot Ltd | Health & social care | 2026 |
| Sensus Wellbeing Ltd | Health & social care | 2022 |
| Sentinel Crest Protection Ltd | Extraterritorial | 2025 |
| Sentinel Financial Ltd | Financial services | 2023 |
| Sentinel Fire Limited | Wholesale & retail | 2012 |
| Sentry Fire Safety Group Doncaster Limited | Manufacturing | 1994 |
| Sentry Fire Safety Group Holdings Limited | Financial services | 2021 |
| Sentry Fire Safety Group Limited | Financial services | 2021 |
| Sentry Guard Limited | Administrative & support | 2022 |
| Senviro Limited | Real estate | 2017 |
| Seoptimizer Ltd | Information & communication | 2025 |
| Septonix Ltd | Wholesale & retail | 2019 |
| SER & Family Limited | Hospitality | 2025 |
| SER Consulting Ltd | Professional & scientific | 2025 |
| Serban I Daniel Ltd | Transport & logistics | 2018 |
| Serban Transporter Ltd | Transport & logistics | 2018 |
| Serenamaryse Ltd | Extraterritorial | 2025 |
| Serendipity Floral Boutique Ltd | Wholesale & retail | 2024 |
| Serene Home Care Notts Limited | Health & social care | 2023 |
| Serene Property Services Ltd | Real estate | 2026 |
| Serenity International Ltd | Information & communication | 2025 |
| Serenity Leisure Parks Limited | Financial services | 2019 |
| Serenity Parks Limited | Financial services | 2016 |
| Serenity Shelfco (NO 3) Ltd | Financial services | 2018 |
| Serenity Shelfco (NO 5) Ltd | Extraterritorial | 2022 |
| Serenity Shelfco (NO 7) Ltd | Financial services | 2024 |
| Serenity Shelfco (NO 8) Ltd | Professional & scientific | 2018 |
| Serentipi Ltd | Administrative & support | 2016 |
| Serghei and Tatyana Limited | Health & social care | 2022 |
| Seriesvalue Limited | Construction | 2000 |
| Serinus Corporate Solutions Ltd | Other services | 2021 |
| Serinus Ltd | Professional & scientific | 2024 |
| Serious Garden Essentials Ltd | Wholesale & retail | 2024 |
| Serlby Quarry Limited | Mining & quarrying | 2007 |
| Serve Olive Lane Limited | Hospitality | 2025 |
| Servehigh Maintenance Services Limited | Manufacturing | 2000 |
| Servexa Limited | Administrative & support | 2025 |
| Service Driver Transport Ltd | Wholesale & retail | 2019 |
| Service Marketing Solutions Ltd | Professional & scientific | 2025 |
| Service Transport Ltd | Transport & logistics | 2019 |
| Serviced Cleans Ltd | Administrative & support | 2025 |
| Serviced Contracting Ltd | Professional & scientific | 2026 |
| Servicestack Dynamics Limited | Information & communication | 2024 |
| Serviplan Ltd | Manufacturing | 2021 |
| Serwan Logistics Limited | Transport & logistics | 2026 |