| Smart Money FX Ltd | Financial services | 2008 |
| Smart Move Car Ltd | Wholesale & retail | 2025 |
| Smart Park and FLY Ltd | Hospitality | 2024 |
| Smart Pine Foods Ltd | Hospitality | 2026 |
| Smart Services Direct Ltd | Other services | 2021 |
| Smart Space Innovations Ltd | Construction | 2021 |
| Smart Steps Education | Education | 2010 |
| Smart Tax Limited | Professional & scientific | 2019 |
| Smart Tech Services Limited | Information & communication | 2015 |
| Smart Telecom Services STS Ltd | Information & communication | 2020 |
| Smart Trans Logistic Limited | Transport & logistics | 2016 |
| Smart Tutors London Ltd | Education | 2020 |
| Smart Vend Solutions Ltd | Wholesale & retail | 2025 |
| Smartax Group Limited | Professional & scientific | 2019 |
| Smartax Limited | Professional & scientific | 2014 |
| Smartblade Limited | Health & social care | 1999 |
| Smartchoice Brickwork & Landscape Ltd | Construction | 2021 |
| Smartciti Investments Limited | Real estate | 2022 |
| Smarter BI Ltd | Real estate | 2019 |
| Smartfix Limited | Wholesale & retail | 2016 |
| Smartflow Consulting Limited | Information & communication | 2024 |
| Smartflow Heating & GAS Ltd | Construction | 2017 |
| Smartguild Limited | Administrative & support | 2005 |
| Smartous Limited | Administrative & support | 2017 |
| Smartthumb Consulting Ltd | Financial services | 2016 |
| Smartway Connect Ltd | Wholesale & retail | 2014 |
| Smarty's After School Club Limited | Education | 2017 |
| Smarty's Nursery Limited | Education | 2009 |
| Smash N' Slide Ltd | Hospitality | 2020 |
| Smash Technologies Ltd | Information & communication | 2019 |
| Smashnbite Ltd | Hospitality | 2025 |
| Smbe Limited | Information & communication | 2013 |
| SMD Accommodations Limited | Real estate | 2024 |
| SMD Link PVT Ltd | Construction | 2011 |
| Smee Services Limited | Administrative & support | 2018 |
| SMG Food Ltd | Wholesale & retail | 2011 |
| Smgv Associates Ltd | Professional & scientific | 2019 |
| SMH Accountants Limited | Professional & scientific | 2013 |
| SMI Cars Ltd | Wholesale & retail | 2025 |
| Smija UK Ltd | Wholesale & retail | 2025 |
| Smile 360 Dental Ltd | Health & social care | 2022 |
| Smile 360 Ltd | Health & social care | 2020 |
| Smile Aesthetics Ltd | Health & social care | 2017 |
| Smile and Care Ltd. | Health & social care | 2021 |
| Smile and Star Limited | Health & social care | 2023 |
| Smile and Wellbeing Limited | Health & social care | 2006 |
| Smile Cliniq Limited | Health & social care | 2012 |
| Smile Easy Limited | Health & social care | 2013 |
| Smile Easy Properties Limited | Households | 2024 |
| Smile M&S Ltd | Transport & logistics | 2015 |
| Smile With ME Limited | Health & social care | 2018 |
| Smilecare (Ewell) Limited | Health & social care | 2016 |
| Smilecraft Dental Care Limited | Health & social care | 2012 |
| Smilenet Limited | Health & social care | 2013 |
| Smiles by DR KAM Limited | Health & social care | 2025 |
| Smiles by JC Limited | Health & social care | 2018 |
| Smiles by MM Popat Ltd | Health & social care | 2025 |
| Smiling Consultants Ltd | Information & communication | 2018 |
| Smit Patel Musical Group & Events Ltd | Arts & recreation | 2024 |
| Smita Patel Ltd | Other services | 2025 |
| Smith & Co Halal Meat Ltd | Transport & logistics | 2016 |
| Smith Food & Wine Ltd | Wholesale & retail | 2026 |
| Smith King & Co. Limited | Professional & scientific | 2011 |
| Smjn Consulting Ltd | Professional & scientific | 2016 |
| SML Construction Ltd | Construction | 2025 |
| SML Enterprise Limited | Real estate | 2014 |
| SML Property Holdings Limited | Real estate | 2022 |
| SMM Media Limited | Information & communication | 2020 |
| Smmx Ltd | Other services | 2020 |
| Smoad Networks Ltd | Information & communication | 2020 |
| Smokey Films Ltd | Information & communication | 2022 |
| Smokey Fridays Exclusive Ltd | Hospitality | 2022 |
| Smokz Limited | Other services | 2017 |
| SMP Aesthetics Ltd | Other services | 2019 |
| SMR Property Solution Ltd | Real estate | 2023 |
| SMR3 Limited | Wholesale & retail | 2023 |
| Smrb Strategies Ltd | Information & communication | 2024 |
| SMS Food & Wine Limited | Wholesale & retail | 2017 |
| SMS Realty London Limited | Professional & scientific | 2026 |
| Smsa Properties Limited | Real estate | 2022 |
| SMT Associates Ltd | Information & communication | 2012 |
| Smvf Investments Limited | Wholesale & retail | 2018 |
| Smvp Consultants Limited | Construction | 2018 |
| SMY Drylining Ltd | Construction | 2022 |
| SN Dhuna Limited | Health & social care | 2013 |
| SN Lettings Ltd | Real estate | 2020 |
| SN London Property Ltd | Construction | 2024 |
| SN Residential Ltd | Real estate | 2015 |
| SN Somaiya Ltd | Professional & scientific | 2026 |
| SNA Health Limited | Health & social care | 2015 |
| SNA Property Ventures Limited | Real estate | 2025 |
| Snaan Limited | Wholesale & retail | 2025 |
| Snack House UK Ltd | Wholesale & retail | 1999 |
| Snack Shack Limited | Hospitality | 2024 |
| Snackwise Ltd | Wholesale & retail | 2025 |
| Snagi Ltd | Information & communication | 2020 |
| Snap Capital Limited | Financial services | 2025 |
| Snap Procurement Ltd | Wholesale & retail | 2025 |
| Snap Properties Group Ltd | Real estate | 1994 |
| Snap PVT. Limited | Professional & scientific | 2020 |