| SRK Electrical Ltd | Construction | 2022 |
| SRK Inspections Ltd | Mining & quarrying | 2018 |
| SRT Knee Limited | Health & social care | 2026 |
| SS Inspire Holdings Ltd | Financial services | 2026 |
| SS Property Developer Ltd | Real estate | 2024 |
| SS Reliable Goods UK Ltd | Wholesale & retail | 2026 |
| SS Yorkshire Investments Ltd | Real estate | 2024 |
| SS Yorkshire Properties Ltd | Real estate | 2023 |
| SS1 Solutions Limited | Health & social care | 2023 |
| Ssf-Uk Ltd | Manufacturing | 2017 |
| Ssmc Yorkshire Ltd | Other services | 2016 |
| SSO23 Ltd | Real estate | 2022 |
| SSP Bidco Limited | Information & communication | 2008 |
| SSP Holdings Limited | Information & communication | 2004 |
| SSP Limited | Information & communication | 2001 |
| SSP Midco 1 Limited | Information & communication | 2008 |
| SSP Midco 2 Limited | Information & communication | 2014 |
| SSP Sirius Limited | Information & communication | 1984 |
| SSP Sirius Solutions Limited | Information & communication | 1996 |
| SST Capital Ltd | Real estate | 2023 |
| ST Andrews Motor Company Limited | Wholesale & retail | 2008 |
| ST David's Building Plastics Limited | Wholesale & retail | 2013 |
| ST Georges Community Trust Limited | Education | 2013 |
| ST Mary's Community Nursery Community Interest Company | Education | 2009 |
| ST Mary's School Management Company Limited | Households | 2011 |
| ST Marys Rehabilitation Centre of Excellence Ltd | Health & social care | 2024 |
| ST Properties Limited | Real estate | 2004 |
| ST. Augustine's Centre, Halifax | Education | 2009 |
| St.Simon Properties Limited | Real estate | 1957 |
| STA Social Ltd | Wholesale & retail | 2024 |
| Stables Garage Limited | Wholesale & retail | 2019 |
| Staff Stay UK Ltd | Real estate | 2023 |
| Staffasset Ltd | Administrative & support | 2024 |
| Staffine Limited | Households | 1979 |
| Stafford Avenue Flats (Maintenance) Limited | Real estate | 1974 |
| Stafford Road Management Company Ltd | Households | 2018 |
| Stainfree Finishers Limited | Manufacturing | 2009 |
| Staininator Ltd. | Administrative & support | 2025 |
| Stainland Road Management Company Limited | Hospitality | 2009 |
| Standley Designs Limited | | 1997 |
| Stanley Cowton International Ltd | Administrative & support | 2023 |
| Stanleys Electrical Services Limited | Construction | 2021 |
| Star Boxing Halifax CIC | Arts & recreation | 2022 |
| Star Cage Limited | Wholesale & retail | 2021 |
| Starburst Media Limited | Professional & scientific | 2015 |
| Starfish Leisurewear Ltd | Wholesale & retail | 2021 |
| Start Point Properties Ltd | Real estate | 2025 |
| State Diamonds Ltd | Wholesale & retail | 2020 |
| Statement by Nazish Limited | Wholesale & retail | 2024 |
| Stathern Lang Ltd | Wholesale & retail | 2025 |
| Station Meadow Beckingham Management Company Limited | Households | 2025 |
| Staups Property Limited | Real estate | 2025 |
| Staying PUT | Hospitality | 2004 |
| Stayprint (UK) Limited | Manufacturing | 2010 |
| Staywarm UK Limited | Transport & logistics | 2003 |
| STC Delivery Ltd | Transport & logistics | 2017 |
| Stead Family Properties Ltd | Real estate | 2022 |
| Steads of Halifax Ltd | Other services | 2017 |
| Steamline Limited | Wholesale & retail | 1999 |
| Steamworx Limited | Other services | 2019 |
| Steel City Events and Productions Ltd | Arts & recreation | 2019 |
| Steel Design Nexus Ltd | Manufacturing | 2019 |
| Steel Frame Structures (Yorkshire) Limited | Construction | 2024 |
| Steel Frame Structures Limited | Construction | 2020 |
| Steinbock Ltd | Professional & scientific | 2013 |
| Stellar Play Interactive Limited | Information & communication | 2023 |
| Stellar Reports Ltd | Administrative & support | 2020 |
| Stellargaze Innovations Ltd | Wholesale & retail | 2025 |
| Step Training Limited | Education | 2006 |
| Stephen Brown Physiotherapy Services Ltd | Health & social care | 2023 |
| Stephen COE (Builders) Ltd | Construction | 2014 |
| Stephen Conway (Bookbinders) Limited | Administrative & support | 2002 |
| Stephen Cowley Limited | Construction | 2017 |
| Stephens and Hoyle Design Ltd | Construction | 2023 |
| Stephenson Risk Consulting Limited | Financial services | 2015 |
| Steps Solutions Limited | Information & communication | 2016 |
| Steps to Makkah Ltd | Administrative & support | 2024 |
| Sterling Client Services Limited | Financial services | 2014 |
| Sterling Forge Ltd | Wholesale & retail | 2025 |
| Sterling Insurance Trustees Limited | Financial services | 1987 |
| Steve Moore Construction Limited | Construction | 2017 |
| Steven Hadcroft Limited | Information & communication | 2006 |
| Stewart Data Limited | Other services | 1964 |
| STF Packaging Limited | Administrative & support | 2023 |
| Sticky Fingers Pre-School | Education | 2003 |
| Stirk Family PUB Co Ltd | Hospitality | 2025 |
| Stitch Express Halifax Ltd | Other services | 2025 |
| Stnikens Ltd | Information & communication | 2019 |
| Stockforyou Ltd | Wholesale & retail | 2025 |
| Stocks Plumbing and Heating (Yorkshire) Limited | Construction | 2015 |
| Stocks Residential Properties Limited | Households | 2001 |
| Stocks Residential Properties Maintenance Limited | Households | 2011 |
| Stocksforyou Ltd | Wholesale & retail | 2025 |
| Stodfold Kennels Limited | Other services | 2001 |
| Stodfold TAP Ltd | Hospitality | 2017 |
| Stone DAM Mills Limited | Wholesale & retail | 1974 |
| Stonebound Resin Driveways Ltd | Construction | 2023 |
| Stonebridge Consultancy Ltd | Information & communication | 1998 |
| Stonefax Property Ltd | Real estate | 2026 |
| Stonehouse and Co Architectural Limited | Professional & scientific | 2016 |