| Syed Medical Services Limited | Health & social care | 2025 |
| Syed Medicos Ltd. | Health & social care | 2016 |
| Syed UX Ltd | Information & communication | 2024 |
| Syedah & Sheeraz Holdings Ltd | Wholesale & retail | 2025 |
| Syeds Estate Agents Ltd | Real estate | 2023 |
| SYK Foods Ltd | Hospitality | 2026 |
| SYM Consultants Ltd | Professional & scientific | 2019 |
| Symj Ltd | Wholesale & retail | 2026 |
| Sympatico Limited | Health & social care | 2024 |
| Synacme Limited | Information & communication | 2022 |
| Synapse Care Ltd | Health & social care | 2025 |
| Synapse Medical Holdings Ltd | Financial services | 2025 |
| Synbit Limited | Information & communication | 2019 |
| Synced Ltd | Information & communication | 2014 |
| Synergelec Constructions Ltd | Construction | 2024 |
| Synergie Holdings Limited | Wholesale & retail | 2016 |
| Synergie Investments Limited | Real estate | 2016 |
| Synergie Properties Limited | Real estate | 2017 |
| Synergy & Co Property Group Ltd | Real estate | 2025 |
| Synergy Aesthetics Consultancy Limited | Other services | 2021 |
| Synergy Aesthetics Limited | Other services | 2020 |
| Synergy Central Management Ltd | Professional & scientific | 2024 |
| Synergy Concurrence Ltd | Other services | 2019 |
| Synergy Conversions Ltd | Information & communication | 2024 |
| Synergy Data Investments Ltd | Real estate | 2025 |
| Synergy Dental Clinic Adlington Ltd | Health & social care | 2020 |
| Synergy Dental Clinic Blackburn Ltd | Health & social care | 2015 |
| Synergy Dental Clinic Bolton Ltd | Health & social care | 2012 |
| Synergy Dental Clinic Burnley Ltd | Health & social care | 2022 |
| Synergy Dental Clinic Bury Ltd | Health & social care | 2012 |
| Synergy Dental Clinic Haslingden Ltd | Health & social care | 2020 |
| Synergy Dental Clinic Leyland Ltd | Health & social care | 2022 |
| Synergy Dental Clinic Liverpool Ltd | Health & social care | 2021 |
| Synergy Dental Clinic Ltd | Health & social care | 2007 |
| Synergy Dental Clinic Macclesfield Ltd | Health & social care | 2006 |
| Synergy Dental Clinic Oldham Ltd | Health & social care | 2021 |
| Synergy Dental Clinic Ormskirk Ltd | Health & social care | 2015 |
| Synergy Dental Clinic Preston Ltd | Health & social care | 2015 |
| Synergy Dental Clinic Rossendale Ltd | Health & social care | 2026 |
| Synergy Dental Clinic Specialist Ltd | Health & social care | 2024 |
| Synergy Dental Clinic Swan Lane Limited | Health & social care | 2012 |
| Synergy Dental Practices Limited | Health & social care | 2008 |
| Synergy Design Concepts Ltd | Professional & scientific | 2019 |
| Synergy Education Centre Limited | Other services | 2020 |
| Synergy ERP Consulting Ltd | Information & communication | 2024 |
| Synergy Estates Developments Limited | Real estate | 2023 |
| Synergy Group Investments Ltd | Real estate | 2018 |
| Synergy Healthcare Ltd | Wholesale & retail | 2019 |
| Synergy Hearing Ltd | Health & social care | 2023 |
| Synergy MEP Design Ltd | Professional & scientific | 2024 |
| Synergy Pharma Limited | Wholesale & retail | 2021 |
| Synergy Property & Development Ltd | Real estate | 2023 |
| Synergy Psych Solutions Limited | Health & social care | 2017 |
| Synergy SIX Group Ltd | Real estate | 2024 |
| Synergy World Power Hamilton Ltd | Energy | 2020 |
| Synergyflow Group Ltd | Information & communication | 2026 |
| Synerlead Ltd | Professional & scientific | 2024 |
| Synetic Sports Ltd | Wholesale & retail | 2026 |
| Synexium Tech Ltd | Information & communication | 2025 |
| Synitec Limited | Information & communication | 2023 |
| Synk Lifestyle Limited | Manufacturing | 2025 |
| Synmetria SAP Consulting Ltd | Information & communication | 2025 |
| Synosophia Ltd | Information & communication | 2025 |
| Syntara Systems Ltd | Information & communication | 2026 |
| Syntaxx Sphere Ltd | Wholesale & retail | 2024 |
| Synthex IT Limited | Information & communication | 2025 |
| Syntrain International Training Academy Ltd | Education | 2022 |
| Syntrain Training Partnerships Ltd | Education | 2024 |
| Syntrik Solutions Ltd | Administrative & support | 2026 |
| Syshah Ltd | Wholesale & retail | 2024 |
| Syslab Epos Limited | Information & communication | 2018 |
| Systelli Consultants Limited | Information & communication | 2023 |
| Systems Direct (Bolton) Ltd | Professional & scientific | 2003 |
| Sytech Limited | Construction | 2015 |
| SYZ Enterprise Ltd | Transport & logistics | 2020 |
| SZ Counsultant Ltd | Wholesale & retail | 2025 |
| SZA Assets Ltd | Financial services | 2026 |
| Szak Transport Ltd | Transport & logistics | 2022 |
| T & a James Limited | Construction | 2008 |
| T & D Electrical Limited | Construction | 2003 |
| T & F Properties Limited | Real estate | 2017 |
| T & J Distribution Ltd | Wholesale & retail | 2023 |
| T & P Supplies Ltd | Other services | 2017 |
| T & S Food BLN Ltd | Hospitality | 2021 |
| T & S Logistic Ltd | Wholesale & retail | 2017 |
| T & T Contractor Services Ltd | Transport & logistics | 2024 |
| T & W Services Limited | Transport & logistics | 2004 |
| T Bhata Optical Ltd | Health & social care | 2022 |
| T C B Renewables Limited | Real estate | 2022 |
| T E P Products Ltd | Other services | 2018 |
| T I a Enterprises Ltd | Administrative & support | 2017 |
| T I Car Sales Ltd | Wholesale & retail | 2023 |
| T I Pharma Limited | Health & social care | 2016 |
| T J Logistics Solutions Ltd | Transport & logistics | 2025 |
| T J Retailing Ltd | Wholesale & retail | 2024 |
| T James Property Limited | Real estate | 2025 |
| T Kenny Properties Ltd | Real estate | 2025 |
| T L Projects Manchester Ltd | Professional & scientific | 2025 |
| T M Finney Limited | Health & social care | 2024 |
| T Mahal Ltd | Hospitality | 2025 |