| Start Empire Ltd | Health & social care | 2019 |
| Start Right Nursery (Ancaster) Limited | Education | 2007 |
| START2SWIM Limited | Education | 2013 |
| Starx Utility Ltd | Professional & scientific | 2025 |
| Starz Holdings Ltd | Real estate | 2017 |
| Starzie Limited | Wholesale & retail | 2020 |
| Stat Express Services Ltd | Construction | 2024 |
| Stateside Distribution Limited | Wholesale & retail | 2022 |
| Statesmantech Ltd | Information & communication | 2020 |
| Stathern Garage Limited | Wholesale & retail | 1988 |
| Stathern Investments Limited | Financial services | 2009 |
| Static ARC Limited | Wholesale & retail | 2021 |
| Station Coffee Shop & Food Ltd | Hospitality | 2023 |
| Station House Properties Ltd | Households | 2018 |
| Station Road (Glenfield) Management Company Limited | Households | 2009 |
| Station Road Automotives Limited | Wholesale & retail | 2025 |
| Station Road Commercials Ltd | Wholesale & retail | 2026 |
| Station Street (Apartment Block) Management Company Limited | Households | 2025 |
| Station Street (Estate) Management Company Limited | Households | 2025 |
| Stava&Mes Ltd | Transport & logistics | 2021 |
| Stax Group Limited | Transport & logistics | 2018 |
| Stay Faded Ltd | Other services | 2024 |
| Stay Good Looking Interiors Limited | Manufacturing | 2010 |
| Stay Inne Property Management Ltd | Real estate | 2025 |
| Stay Tonight Limited | Hospitality | 2019 |
| Stay With US Lettings Ltd | Real estate | 2019 |
| Stayarray Ltd | Households | 2024 |
| Stayfree Music Limited | Arts & recreation | 1997 |
| Stayposteduk Ltd | Wholesale & retail | 2026 |
| Stayshire Ltd | Hospitality | 2024 |
| STE Hospitality Limited | Hospitality | 2019 |
| STE Leisure Limited | Hospitality | 2019 |
| STE Property Limited | Financial services | 2019 |
| Ste-Van Commercial Ltd | Wholesale & retail | 2025 |
| Steadbull Investments Ltd | Real estate | 2021 |
| Steak & Lounge Ltd | Hospitality | 2018 |
| Steak & Stax Ltd | Hospitality | 2026 |
| Steak Box Grill Ltd | Hospitality | 2025 |
| Steakhouse Food Ltd | Hospitality | 2022 |
| Stealth Analytics Ltd | Information & communication | 2019 |
| Steamin' Billy (Oadby) Limited | Professional & scientific | 2016 |
| Steamin' Billy (Property) Limited | Wholesale & retail | 2004 |
| Steamin' Billy Brewing Co Limited | Hospitality | 2003 |
| STEANEYS2018 Ltd | Hospitality | 2018 |
| Stechi Educational Services Ltd | Education | 2019 |
| Steel FIX Solutions Ltd | Administrative & support | 2007 |
| Steel TEQ Ltd | Manufacturing | 2002 |
| Steele Engineering Ltd | Wholesale & retail | 2023 |
| Steelite Power Ltd | Professional & scientific | 2023 |
| Steelo Labs Ltd | Information & communication | 2024 |
| Steelyard Kelham Ltd | Real estate | 2019 |
| Steerick Limited | Health & social care | 2023 |
| Steeris Holdings Ltd | Administrative & support | 2018 |
| Steerit Ltd | Education | 2025 |
| Stefan Builders Limited | Construction | 2025 |
| Stefaniabarone Ltd | Health & social care | 2022 |
| Stefanos Care Ltd | Administrative & support | 2024 |
| Stefany Cleaning Ltd | Construction | 2019 |
| Stein & Sight Ltd | Wholesale & retail | 2019 |
| Stella Shine Ltd | Wholesale & retail | 2022 |
| Stella Transport Ltd | Transport & logistics | 2025 |
| Stella's Café Ltd | Hospitality | 2023 |
| Stellae Limited | Professional & scientific | 1996 |
| Stellar Asset Investments Limited | Real estate | 2025 |
| Stellar Care Group Limited | Health & social care | 2025 |
| Stellar Global Technologies Ltd | Wholesale & retail | 2020 |
| Stellar Investors Limited | Health & social care | 2021 |
| Stellarprint Solutions Ltd | Manufacturing | 2024 |
| Stem Educators Limited | Education | 2019 |
| Stemshoots Training Ltd | Education | 2026 |
| Sten Manis Ltd | Manufacturing | 2025 |
| Step and Pose Ltd | Information & communication | 2025 |
| Step in OFF Licence Ltd | Wholesale & retail | 2025 |
| Step in Podiatry Ltd | Wholesale & retail | 2024 |
| Step One Protection Ltd | Administrative & support | 2025 |
| Step-By-Step Support Ltd | Public administration | 2024 |
| Steph & Angel Associates Ltd | Public administration | 2020 |
| Stephand Trade Limited | Wholesale & retail | 2025 |
| Stephanie Amber Ltd | Professional & scientific | 2023 |
| Stephanie Bolton Limited | Manufacturing | 2020 |
| Stephen Burbidge Consultancy Limited | Professional & scientific | 2016 |
| Stephen George & Partners LLP | | 2009 |
| Stephen George International Limited | Professional & scientific | 2000 |
| Stephen George Limited | Professional & scientific | 2018 |
| Stephen Jelley Racing Limited | Arts & recreation | 2007 |
| Stephen Rayns Limited | Construction | 1979 |
| Stephenson Engineering Solutions Ltd | Professional & scientific | 2025 |
| Stepinfashion 121 Limited | Manufacturing | 2025 |
| Steps Systems Limited | Information & communication | 2025 |
| Stepsellr Limited | Wholesale & retail | 2024 |
| Steris Solutions Limited | Wholesale & retail | 1992 |
| Sterlin Properties Limited | Real estate | 2022 |
| Sterling 3 Limited | Financial services | 2019 |
| Sterling 4 Limited | Financial services | 2020 |
| Sterling Accountants Limited | Professional & scientific | 1999 |
| Sterling Asset Holdings Ltd | Real estate | 2022 |
| Sterling Automata Ltd | Information & communication | 2026 |
| Sterling Bluebrick Limited | Real estate | 2018 |
| Sterling Energy Group Ltd | Administrative & support | 2025 |
| Sterling Global Partners Ltd | Wholesale & retail | 2025 |