| SK Phone & Vape Ltd | Wholesale & retail | 2024 |
| SK Self Assessment Ltd | Administrative & support | 2025 |
| SK Solicitors LLP | | 2009 |
| SK Tax and Bookkeeping Ltd | Professional & scientific | 2020 |
| SK Traderz Ltd | Wholesale & retail | 2026 |
| SK Trading (NW) Ltd | Wholesale & retail | 2025 |
| SK7 Limited | Wholesale & retail | 2008 |
| SKA5 Ltd | Wholesale & retail | 2025 |
| Skadi Services Limited | Other services | 2026 |
| SKB Motors Ltd | Wholesale & retail | 2025 |
| SKB Traders NW Ltd | Wholesale & retail | 2022 |
| Skbm Investment Ltd | Real estate | 2025 |
| Skeelsforce Ltd | Professional & scientific | 2026 |
| SKI Freight International Limited | Transport & logistics | 2013 |
| Skilled Force Limited | Construction | 2015 |
| Skillora Solutions Ltd | Education | 2026 |
| Skin 101 Limited | Health & social care | 2022 |
| Skin Aesthetics by Dina Limited | Other services | 2010 |
| Skin at VR Limited | Other services | 2024 |
| Skin by Paige Alexandra Ltd | Other services | 2022 |
| Skin Deep Beauty & Hairdressing Ltd | Other services | 2019 |
| Skin Fade Studio Ltd | Other services | 2025 |
| Skin Hair Dermatology Education Ltd | Education | 2021 |
| Skinbysaf Limited | Health & social care | 2025 |
| Skindr Ltd | Health & social care | 2017 |
| Skinfinity Aesthetic Clinic Limited | Other services | 2021 |
| Skinform Ltd | Wholesale & retail | 2025 |
| Skinrise Clinic Ltd | Health & social care | 2026 |
| Skmoyo (UK) Limited | Public administration | 2017 |
| SKO Barbers Ltd | Other services | 2025 |
| SKR Auto Care Limited | Wholesale & retail | 2023 |
| Skrape Limited | Information & communication | 2021 |
| Skuh Technologies Limited | Information & communication | 2022 |
| Skvl Limited | Other services | 2026 |
| Sky Blue Communications Limited | Information & communication | 2020 |
| Sky Direct Travel Limited | Administrative & support | 2001 |
| Sky Enterprises PVT Limited | Transport & logistics | 2024 |
| Sky Gardens Residences Ltd | Real estate | 2024 |
| Sky Haven Group Ltd | Transport & logistics | 2023 |
| Sky Luxury Limited | Administrative & support | 2020 |
| Sky Luxury Services Limited | Administrative & support | 2019 |
| Sky Luxury Tours Limited | Administrative & support | 2023 |
| Sky Metal Services Ltd | Wholesale & retail | 2018 |
| Sky One Market Ltd | Wholesale & retail | 2021 |
| Sky Rush Ltd | Transport & logistics | 2024 |
| Sky Signs Ltd | Professional & scientific | 2024 |
| Sky SIM Flight Training Limited | Transport & logistics | 2020 |
| Sky Tissue Limited | Wholesale & retail | 2020 |
| Skybon & Co Limited | Hospitality | 2026 |
| Skye Accessories Ltd | Wholesale & retail | 2015 |
| Skye Mercury Limited | Hospitality | 2019 |
| Skyeview HC Limited | Public administration | 2022 |
| Skyframe Technology Limited | Other services | 2025 |
| Skygold Resources Ltd | Health & social care | 2015 |
| Skyhaven Healthcare Services Ltd | Administrative & support | 2022 |
| Skyhaven Properties Ltd | Hospitality | 2023 |
| Skyhub Travel Ltd | Administrative & support | 2025 |
| Skylight Travel Services Ltd | Administrative & support | 2012 |
| Skyline Builders (MCR) Ltd | Construction | 2023 |
| Skyline Legal Limited | Real estate | 2024 |
| Skyline Spire UK Ltd | Wholesale & retail | 2024 |
| Skylinx Travel Limited | Administrative & support | 2025 |
| Skyn POD Ltd | Health & social care | 2025 |
| Skynett International Limited | Real estate | 2002 |
| Skyrise Goods Ltd | Wholesale & retail | 2026 |
| Skyrise Transport Services Ltd | Transport & logistics | 2026 |
| Skytechsit Ltd | Information & communication | 2023 |
| Skyverge Ltd | Professional & scientific | 2025 |
| Skyway Genius Ltd | Wholesale & retail | 2022 |
| Skyways Travel Ltd | Administrative & support | 2019 |
| SL Data Ltd | Information & communication | 2025 |
| SL Healthcare Consultancy Ltd | Professional & scientific | 2022 |
| SLA Trades Ltd | Wholesale & retail | 2024 |
| Slapromers Ltd | Wholesale & retail | 2019 |
| Slate Developments Limited | Construction | 1982 |
| Slax Haulage Limited | Transport & logistics | 2004 |
| Slax Sleepwear Ltd | Wholesale & retail | 2026 |
| Slayunits Hair Lounge Limited | Other services | 2025 |
| Slbd Solutions Limited | Information & communication | 2022 |
| SLC Scaffolding (NW) Ltd | Construction | 2025 |
| SLC01 Limited | Wholesale & retail | 2024 |
| Slcc Trading Ltd | Wholesale & retail | 2025 |
| SLD Parts Ltd | Wholesale & retail | 2025 |
| Sleek Property Ventures Ltd | Real estate | 2025 |
| Sleek Smart Solutions Ltd | Wholesale & retail | 2015 |
| Sleekby Ltd | Wholesale & retail | 2022 |
| Sleep Protect Ltd | Wholesale & retail | 2024 |
| SLH Holdings Ltd | Financial services | 2023 |
| Slice Styling Limited | Other services | 2004 |
| Slim 80 Days Limited | Information & communication | 2018 |
| Slim Chef Limited | Hospitality | 2024 |
| Slim Film & TV Limited | Information & communication | 2011 |
| SLJ Driving Services Ltd | Transport & logistics | 2019 |
| SLK NW Ltd | Wholesale & retail | 2026 |
| SLL Entertainments Ltd | Administrative & support | 2026 |
| SLL Manchester Limited | Real estate | 2019 |
| SLN Consultants Ltd | Professional & scientific | 2020 |
| SLN Marketing Ltd | Professional & scientific | 2024 |
| Sloane Salon Limited | Administrative & support | 2024 |
| Slok Ceiling & Partition Solutions Ltd | Construction | 2020 |