| Shore Harbour Holdings Limited | Real estate | 2024 |
| Shore Property Group Ltd | Construction | 2025 |
| Shore View Retreats Ltd | Hospitality | 2023 |
| Shoreacres (Sandbanks) Limited | Households | 1962 |
| Shorehaven (Poole) Limited | Households | 2001 |
| Shorelark Limited | Professional & scientific | 2015 |
| Shorelark Properties Limited | Real estate | 2019 |
| Shoreline Car Sales Limited | Wholesale & retail | 2017 |
| Shoreline Carpentry (Dorset) Limited | Manufacturing | 2020 |
| Shoreline Occupational Therapy Ltd | Public administration | 2023 |
| Shoreline Plumbing Services Ltd | Construction | 2024 |
| Shoreline Tech Ltd | Information & communication | 2026 |
| Shoreshift Ltd | Extraterritorial | 2021 |
| Shoreside Marine Services Ltd | Manufacturing | 2010 |
| Shoreside Solar and Electrical Ltd | Construction | 2024 |
| Shoreside Strategy Limited | Professional & scientific | 2026 |
| Shoreward Engineering Design Ltd | Professional & scientific | 2026 |
| Short Break Away Ltd | Hospitality | 2024 |
| Short Stay Consultancy Limited | Hospitality | 2025 |
| Shortr Ltd | Administrative & support | 2023 |
| Showcraft Software Ltd | Information & communication | 2020 |
| Showglo Ltd | Information & communication | 2023 |
| Shrap Holdings Ltd | Information & communication | 2019 |
| Shrap Ltd | Financial services | 2018 |
| Shrap Network Solutions Ltd | Information & communication | 2023 |
| Shreks Auto Ltd | Wholesale & retail | 2024 |
| Shrut Limited | Administrative & support | 2015 |
| SHS Properties Management Limited | Real estate | 2025 |
| Shubh Associates Ltd | Wholesale & retail | 2013 |
| Shugar Labs Ltd | Information & communication | 2025 |
| Shush Events (UK) Limited | Information & communication | 2016 |
| Shut the Front Door Ltd | Real estate | 2019 |
| Shuttertechnik Limited | Administrative & support | 2003 |
| Shygirl Limited | Information & communication | 2020 |
| Shyps Contracting Ltd | Administrative & support | 2019 |
| SI Leap Limited | Professional & scientific | 2023 |
| SIA Trans Community Ltd | Transport & logistics | 2023 |
| Sibbett Gregory Energy Performance LLP | | 2008 |
| Sibkade Ltd | Information & communication | 2025 |
| Sieger Properties Limited | Real estate | 2003 |
| Sienna Birch Limited | Arts & recreation | 2026 |
| Sierra Asset Management Limited | Professional & scientific | 2009 |
| Sigma Clean Ltd | Administrative & support | 2012 |
| Sigma Property Limited | Real estate | 2003 |
| Sigma Stream Limited | Information & communication | 2019 |
| Sigma Supply Chain Support Limited | Professional & scientific | 2024 |
| Sigma Telecommunications Services Limited | Information & communication | 1993 |
| Sigmasolutionuk Ltd | Professional & scientific | 2025 |
| Sign-Wize Limited | Manufacturing | 1994 |
| Signal Mind Holding Ltd | Financial services | 2021 |
| Signalyx Limited | Professional & scientific | 2008 |
| Signature Interiors (BH) Ltd | Construction | 2025 |
| Signature Network Solutions Limited | Information & communication | 2011 |
| Signature PAY Limited | Administrative & support | 2022 |
| Signature Surfacing Ltd | Administrative & support | 2023 |
| Signs & Stickers Ltd | Manufacturing | 2015 |
| Signsense UK Ltd | Professional & scientific | 2023 |
| Sigran-Pfeiffer Limited | Wholesale & retail | 2026 |
| Sigrid Limited | Health & social care | 2022 |
| Sijeel Group Limited | Information & communication | 2025 |
| Sika Skincare Ltd | Manufacturing | 2021 |
| Sikrey Ltd | Hospitality | 2024 |
| Silent Disco Hire Stars Ltd | Administrative & support | 2026 |
| Silent Disco Stars Ltd | Administrative & support | 2024 |
| Silent Yoga Ltd | Education | 2026 |
| Silica Limited | Information & communication | 2010 |
| Silo Energy Ltd | Manufacturing | 2024 |
| Silo Team Limited | Information & communication | 2022 |
| Silva Cleaning Service Limited | Administrative & support | 2014 |
| Silva Creatives Ltd | Professional & scientific | 2026 |
| Silver Arrow Bespoke Limited | Construction | 2013 |
| Silver Arrow Investments Ltd | Real estate | 2013 |
| Silver Arrow Management Ltd | Real estate | 2008 |
| Silver Cloud Consulting Ltd | Information & communication | 2022 |
| Silver FOX Stunts Ltd | Administrative & support | 2019 |
| Silver Frog Press Ltd | Information & communication | 2019 |
| Silver Lark Property Management Ltd | Real estate | 2016 |
| Silver Linings Co. Ltd | Wholesale & retail | 2025 |
| Silver Management Ltd | Households | 2026 |
| Silver Olive Ltd | Real estate | 2024 |
| Silver Pet Paws Ltd | Manufacturing | 2025 |
| Silverbay Capital Ltd | Construction | 2019 |
| Silverbay Land Ltd | Real estate | 2020 |
| Silverbirch Partners Limited | Administrative & support | 2010 |
| Silverline Enterprises Limited | Wholesale & retail | 1989 |
| Silverline Ventures Ltd | Wholesale & retail | 2025 |
| Silversands Homes Limited | Real estate | 2021 |
| Silverstage Theatre Co. Ltd | Arts & recreation | 2025 |
| Silverstone Enterprises & Strategic Innovations Ltd | Professional & scientific | 2025 |
| Silversword Limited | Health & social care | 2005 |
| Silvie Limited | Wholesale & retail | 2022 |
| Simerics Limited | Professional & scientific | 2023 |
| SIMFLIGHT4U Limited | Information & communication | 2020 |
| Simmer Interiors Ltd | Construction | 2018 |
| Simon Dean Services Limited | Construction | 2004 |
| Simon Dennis ENT Limited | Health & social care | 2017 |
| Simon Valentine Transport Ltd | Transport & logistics | 2020 |
| Simon Warren Creative Ltd | Professional & scientific | 2022 |
| Simple Chef Food Limited | Hospitality | 2019 |
| Simple Issue Ltd | Information & communication | 2025 |