| SK IT Ltd | Information & communication | 2016 |
| SK Knightcare Ltd | Health & social care | 2013 |
| SK Knightcare Properties Ltd | Real estate | 2025 |
| SK Leeds Ltd | Real estate | 2026 |
| SK Lloyds Advisory Ltd | Professional & scientific | 2020 |
| SK Local Grocery Store Ltd | Wholesale & retail | 2026 |
| SK LS15 Ltd | Hospitality | 2023 |
| SK M&E Services Ltd | Construction | 2024 |
| SK Medical Services Leeds Ltd | Health & social care | 2023 |
| SK Motors Yorkshire Ltd | Wholesale & retail | 2026 |
| SK OFF Licence Ltd | Wholesale & retail | 2024 |
| SK Online Solutions Limited | Wholesale & retail | 2021 |
| SK Properties Yorkshire Limited | Real estate | 2025 |
| SK Recovery & Breakdown Services Ltd | Transport & logistics | 2026 |
| SK Scaffolding Yorkshire Ltd | Construction | 2018 |
| SKA Group Ltd | Professional & scientific | 2020 |
| Skai Investments Ltd | Real estate | 2018 |
| Skaife Group Limited | Financial services | 2016 |
| Skalable Consulting Ltd | Extraterritorial | 2016 |
| Skalar (UK) Limited | Water & waste | 1989 |
| Skaleexec Limited | Administrative & support | 2020 |
| SKAN1 Limited | Real estate | 2024 |
| Skandanujsai Ltd | Education | 2026 |
| Skape Limited | Wholesale & retail | 2003 |
| Skar Organics Limited | Manufacturing | 2018 |
| Skas Building Contractors (Leeds) Ltd | Construction | 2022 |
| Skas Project Management Ltd | Construction | 2023 |
| Skas Property Management Ltd | Real estate | 2023 |
| Skawina Grocery Limited | Wholesale & retail | 2026 |
| Skdf Consulting Ltd | Professional & scientific | 2023 |
| Skeena Cottage Limited | Hospitality | 2024 |
| Skehan Ltd | Real estate | 2024 |
| Skeja Ltd | Construction | 2014 |
| Skeletal Imaging Legal Limited | Professional & scientific | 2023 |
| Skeletal Imaging Limited | Health & social care | 2003 |
| Skeleton Imaging Limited | Health & social care | 2017 |
| Skellow Plant Limited | Construction | 1989 |
| Skelton Broadcast Services Limited | Information & communication | 2022 |
| Skelton Holdings Limited | Financial services | 2020 |
| Skelton Limited | Water & waste | 2000 |
| Skene Investment Limited | Real estate | 2024 |
| Skerrett Construction Limited | Construction | 2018 |
| Skerryvore Holdings Limited | Financial services | 2019 |
| Sketch Hair and Beauty Limited | Other services | 2023 |
| Skewer Point Ltd | Construction | 2022 |
| SKG 4 Business Ltd | Professional & scientific | 2023 |
| Skgill Consulting Limited | Administrative & support | 2016 |
| SKH Plumbing Ltd | Construction | 2026 |
| SKH Property Solutions Ltd | Real estate | 2026 |
| SKI Electrical Limited | Professional & scientific | 2011 |
| SKI Security Limited | Wholesale & retail | 2015 |
| Skience Limited | Extraterritorial | 2018 |
| Skill Stackers Ltd | Education | 2023 |
| Skilla Healthcare Ltd | Administrative & support | 2026 |
| Skillection Ltd | Administrative & support | 2017 |
| Skills Finder Limited | Information & communication | 2008 |
| Skills for Care Ltd | Education | 1999 |
| Skills for Care Services Ltd | Extraterritorial | 2021 |
| Skills for Care Solutions Limited | Health & social care | 2012 |
| Skills on Demand Ltd | Administrative & support | 2020 |
| Skills Today Ltd | Administrative & support | 2017 |
| Skillsmate Ltd | Information & communication | 2021 |
| Skimz Drylining Limited | Manufacturing | 2019 |
| Skin Becomes HER Ltd | Health & social care | 2026 |
| Skin Camouflage Services Limited | Other services | 2018 |
| Skin Care Clinics Limited | Other services | 2018 |
| Skin Care for Sport Limited | Health & social care | 2013 |
| Skin Deep Laser and Beauty Clinic Ltd | Other services | 2022 |
| Skin Doctor Clinics Limited | Health & social care | 2012 |
| Skin Focus Limited | Other services | 2018 |
| Skin Formations Limited | Wholesale & retail | 2022 |
| Skin Serious Ltd | Wholesale & retail | 2021 |
| Skin Surgery Clinic Limited | Health & social care | 2018 |
| Skin Surgery Clinic Newcastle Limited | Health & social care | 2024 |
| Skin Switch Limited | Health & social care | 2024 |
| Skincare London Limited | Professional & scientific | 2022 |
| Skingood Limited | Health & social care | 2012 |
| Skininu Limited | Other services | 2025 |
| Skinny Chilly Ltd | Manufacturing | 2023 |
| Skinovate Aesthetics Limited | Health & social care | 2017 |
| Skinska Pharmaceutica Limited | Manufacturing | 2018 |
| Skinworx Clinic Limited | Health & social care | 2017 |
| Skinworx Clinic Systems Limited | Other services | 2020 |
| SKIP2.COM Limited | Extraterritorial | 2011 |
| Skipper RUM Trading Company Limited | Wholesale & retail | 2021 |
| Skippko Arts Team | Education | 1997 |
| Skipton Brewing Company Ltd | Manufacturing | 2025 |
| Skipton Mobile and Laptop Ltd | Wholesale & retail | 2025 |
| Skipton Property Ltd | Real estate | 2025 |
| Skipton Road Car Wash Ltd | Wholesale & retail | 2024 |
| SKIROUTE16 Limited | Information & communication | 2010 |
| Skittals Ltd | Professional & scientific | 2025 |
| SKJ Project Management Ltd | Information & communication | 2012 |
| SKL Properties (Yorkshire) Ltd | Real estate | 2023 |
| Skln Services Ltd | Financial services | 2024 |
| SKN Eats Limited | Hospitality | 2025 |
| SKO Foods Ltd | Hospitality | 2024 |
| SKR Real Estate Limited | Real estate | 2025 |
| SKR Solutions Ltd | Wholesale & retail | 2026 |
| Skratch Design Ltd | Professional & scientific | 2018 |