| Smart Leafleting Ltd | Professional & scientific | 2012 |
| Smart Living Investments (UK) Limited | Administrative & support | 2014 |
| Smart Media Tech Limited | Wholesale & retail | 2015 |
| Smart Motor House Ltd | Wholesale & retail | 2025 |
| Smart Move (West Yorkshire) Limited | Administrative & support | 2008 |
| Smart Moves Block Management Limited | Professional & scientific | 2023 |
| Smart Moves Group Ltd | Extraterritorial | 2007 |
| Smart PAY Management Ltd | Administrative & support | 2019 |
| Smart Payroll Group Limited | Administrative & support | 2019 |
| Smart Plumbers Limited | Construction | 2024 |
| Smart Property Investment Solutions Ltd | Real estate | 2024 |
| Smart Property Management Ltd | Real estate | 2005 |
| Smart Retailers Ltd | Wholesale & retail | 2020 |
| Smart Sales (UK) Ltd | Real estate | 2007 |
| Smart Savers Fintech Limited | Information & communication | 2026 |
| Smart Schoolwear Centre Ltd | Administrative & support | 2015 |
| Smart Step Properties Ltd | Real estate | 2023 |
| Smart Tech Bradford Limited | Wholesale & retail | 2021 |
| Smartdrive Group Limited | Wholesale & retail | 2017 |
| Smartedge Recruitment & Trainings Limited | Professional & scientific | 2025 |
| Smarter Change - International Mentoring Academy Ltd | Professional & scientific | 2013 |
| Smarter Education Ltd | Education | 2021 |
| Smartline Global Ltd | Wholesale & retail | 2019 |
| Smartsocialshq Ltd | Professional & scientific | 2025 |
| Smartsps Ltd | Administrative & support | 2025 |
| Smartstock Trading Limited | Wholesale & retail | 2026 |
| Smartway Remit Ltd | Financial services | 2025 |
| Smarty Pads Leeds Ltd | Real estate | 2025 |
| Smash Cartel Burgers Ltd | Hospitality | 2026 |
| Smash IT 1 Ltd | Hospitality | 2025 |
| Smash Official Rochdale Limited | Hospitality | 2023 |
| Smashed Drinks Brands Ltd | Professional & scientific | 2023 |
| Smashedcreations Ltd | Wholesale & retail | 2025 |
| Smashin’ Slice Ltd | Hospitality | 2022 |
| SMB Explore Limited | Wholesale & retail | 2025 |
| SMB Properties Yorkshire Ltd | Real estate | 2025 |
| Smbf International Markets Limited | Other services | 2024 |
| SMC UK Logistics Limited | Transport & logistics | 2017 |
| SMD Nails & Beauty Limited | Other services | 2025 |
| SMD Vintage 71 Ltd | Wholesale & retail | 2024 |
| Smda Ltd | Real estate | 2020 |
| SME Commercial Ltd | Real estate | 2025 |
| Smfh Limited | Transport & logistics | 2023 |
| Smght Limited | Hospitality | 2024 |
| SMH (Yorkshire) Ltd | Professional & scientific | 2012 |
| Smh(Wrose) Limited | Health & social care | 2009 |
| Smile Bright Orthodontic Ltd | Health & social care | 2026 |
| Smile Create Ltd | Health & social care | 2010 |
| Smile Management Ltd | Administrative & support | 2016 |
| Smile Moneel Limited | Health & social care | 2013 |
| Smile Quarter Limited | Extraterritorial | 2026 |
| Smile Support Locums Ltd | Health & social care | 2025 |
| Smiley Octopus Ltd | Other services | 2018 |
| Smith & Sons Holdings Ltd | Financial services | 2022 |
| Smith Bros. (Staincliffe) Limited | Professional & scientific | 1942 |
| Smith GAS and OIL Ltd. | Manufacturing | 2009 |
| Smith Investments North Ltd | Real estate | 2026 |
| Smith Munir Accountancy Ltd | Professional & scientific | 2011 |
| Smiths Properties Limited | Real estate | 1984 |
| SMK Accountants Limited | Professional & scientific | 2021 |
| SMK Ecom Ltd | Information & communication | 2021 |
| SMK Locums Ltd | Health & social care | 2019 |
| Smkd Vape Limited | Wholesale & retail | 2025 |
| SMN Security Ltd | Administrative & support | 2026 |
| Smnk Health Ltd | Health & social care | 2025 |
| Smokeeze Ltd | Wholesale & retail | 2022 |
| Smokehouse Bradford Limited | Manufacturing | 2016 |
| Smokers Corner Ltd | Wholesale & retail | 2015 |
| Smokes & Mirrors Limited | Other services | 2025 |
| Smokey Occasions Ltd | Hospitality | 2023 |
| Smokeys (Portswood) Limited | Hospitality | 2021 |
| Smokeys (Portswoods SO) Limited | Hospitality | 2021 |
| Smoking Grill Bradford Limited | Hospitality | 2025 |
| Smoky Boro (Middlesbrough) Ltd | Hospitality | 2025 |
| Smoky Bro’S Ltd | Hospitality | 2021 |
| Smollv Limited | Construction | 2025 |
| Smooth KUT Ltd | Other services | 2025 |
| SMR Management Ltd | Wholesale & retail | 2019 |
| SMR Properties Management Ltd | Real estate | 2024 |
| SMR Retail Limited | Wholesale & retail | 2023 |
| SMS Contractors Limited | Professional & scientific | 2023 |
| SMS Direct Ltd | Wholesale & retail | 2021 |
| SMS Glazing Ltd | Construction | 2026 |
| Smsbx Limited | Public administration | 2024 |
| SMT Imaging Ltd | Health & social care | 2021 |
| Smuas Taxis Limited | Transport & logistics | 2025 |
| SMW Taverns Ltd | Hospitality | 2026 |
| Smyc Holdings Ltd | Hospitality | 2022 |
| SMZ Britannia Limited | Financial services | 2024 |
| SN & Sons Building Contractors Ltd | Construction | 2024 |
| SN Autos Limited | Wholesale & retail | 2023 |
| SN Construction Limited | Other services | 2018 |
| SN Corporation Limited | Professional & scientific | 2013 |
| SN Deals Ltd | Wholesale & retail | 2024 |
| SN Delivery Limited | Transport & logistics | 2025 |
| SN Jovinda Ltd | Transport & logistics | 2018 |
| SN Media Tech Ltd | Wholesale & retail | 2024 |
| SN Vitalsx Ltd | Wholesale & retail | 2026 |
| SNA Investments Yorkshire Limited | Real estate | 2024 |
| SNA Investmentz Ltd | Real estate | 2025 |