| Soap Medical Ltd | Health & social care | 2011 |
| Soap Opera Production Services Ltd | Arts & recreation | 2003 |
| Sobar Limited | Extraterritorial | 2024 |
| Sober Fish Ltd | Administrative & support | 2021 |
| Sobo Bays Limited | Arts & recreation | 2026 |
| Sobo Bike Hire Ltd | Wholesale & retail | 2025 |
| Sobo Fitness Limited | Arts & recreation | 2023 |
| Sobo Homes Ltd | Real estate | 2025 |
| Sobo Living Ltd | Real estate | 2025 |
| Sobo Logistics Ltd | Transport & logistics | 2024 |
| Sobo Projects Ltd | Construction | 2025 |
| Sobo Skate Limited | Arts & recreation | 2025 |
| Sobo Stays Ltd | Real estate | 2019 |
| Sobo:Sommelier Ltd | Hospitality | 2022 |
| Sobobeaches Ltd | Arts & recreation | 2026 |
| Sobofish Ltd | Hospitality | 2020 |
| Sobrhaus Limited | Wholesale & retail | 2024 |
| Soccerpitch Ltd | Arts & recreation | 2011 |
| Social Care Catering Solutions Ltd | Hospitality | 2008 |
| Social Profile Ltd | Professional & scientific | 2020 |
| Socialite Solutions Limited | Professional & scientific | 2021 |
| Soco Aesthetics Ltd | Health & social care | 2021 |
| Soco Investments (Boscombe) Ltd | Real estate | 2024 |
| Soco Investments (Southbourne) Ltd | Real estate | 2025 |
| Soco Therapies Limited | Health & social care | 2025 |
| Socoa Interiors Ltd | Construction | 2025 |
| Socoa Properties Ltd | Real estate | 2025 |
| Sofa Repair Solutions Limited | Other services | 2023 |
| Sofia House Freehold Residents Limited | Households | 2018 |
| Soft Objects Limited | Information & communication | 1997 |
| Softdev Validation Limited | Information & communication | 2024 |
| Softlicense Group Ltd | Information & communication | 2025 |
| Software Support Limited | Information & communication | 1997 |
| Soha Cost Consulting Limited | Professional & scientific | 2024 |
| Soha Properties Limited | Real estate | 2024 |
| SOL Domestic Cleaning Services Limited | Administrative & support | 2018 |
| SOL Guides Ltd | Wholesale & retail | 2025 |
| SOL Lounger Ltd | Wholesale & retail | 2025 |
| Solac Properties Limited | Real estate | 2003 |
| Solar Bright Solutions Ltd | Administrative & support | 2025 |
| Solar Horizons Limited | Administrative & support | 2016 |
| Solar Services Southwest Ltd | Construction | 2021 |
| Solar Tech Solutions Ltd | Construction | 2023 |
| Solar Wise Solutions Ltd | Energy | 2026 |
| Solas Global Ltd | Information & communication | 2022 |
| Solei and Terra Limited | Wholesale & retail | 2025 |
| Solenne Hospitality Ltd | Hospitality | 2025 |
| Solent Court (Southbourne) Limited | Households | 2001 |
| Solent Fire Safety Services Ltd | Professional & scientific | 2012 |
| Solent Leisure Limited | Arts & recreation | 1941 |
| Solent Machining & Engineering Services Limited | Manufacturing | 2009 |
| Solent Meads Limited | Arts & recreation | 2026 |
| Solent Pines Management Limited | Households | 1975 |
| Solent Plant Limited | Construction | 2013 |
| Solent Projects Limited | Construction | 1984 |
| Solent Snack Ltd | Wholesale & retail | 2025 |
| Solent Stair Lifts Limited | Manufacturing | 2004 |
| Solerio Energy Ltd | Other services | 2026 |
| Solex Property Limited | Real estate | 2021 |
| Soli-Tree Arborist Limited | Agriculture & fishing | 2025 |
| Solitaire Jewellers Ltd | Wholesale & retail | 2026 |
| Solmar Cleaning Ltd | Administrative & support | 2026 |
| Solo 7 Investments Limited | Financial services | 2021 |
| Solomo Ltd | Real estate | 2022 |
| Solomons Law LLP | | 2021 |
| Solum GB Limited | Construction | 2007 |
| Solus Lift & Electrical Ltd | Manufacturing | 2024 |
| Solus Trade Ltd | Hospitality | 2020 |
| Solustrade Holdings Limited | Real estate | 2025 |
| Solutions in Practise Ltd | Information & communication | 2014 |
| Somaiya Investments Limited | Real estate | 2024 |
| Somaiya Restaurants Limited | Hospitality | 2024 |
| Somarm Ltd | Professional & scientific | 2026 |
| Someday Bridal Ltd | Wholesale & retail | 2026 |
| Somer Design Ltd | Professional & scientific | 2013 |
| Sonas Strategies Ltd | Professional & scientific | 2024 |
| Song's Companion Ltd | Hospitality | 2023 |
| Sonic IQ Limited | Information & communication | 2005 |
| Sopaanlide Ltd | Hospitality | 2021 |
| Sophemilia Limited | Real estate | 2018 |
| Sophia Louise Design Limited | Wholesale & retail | 2021 |
| Sophie & Henry Properties Limited | Real estate | 2026 |
| Sopress Investments Limited | Extraterritorial | 1970 |
| Sorbet Skin Limited | Wholesale & retail | 2025 |
| Sordillo Consulting Ltd | Wholesale & retail | 2025 |
| Sorted Surf Shop Ltd | Wholesale & retail | 2006 |
| SOS Freehold Ltd | Households | 2017 |
| SOS Removals Ltd | Transport & logistics | 2011 |
| Soul Living Ltd | Real estate | 2026 |
| Soulfire Coaching Limited | Other services | 2022 |
| Soulmade Ltd | Transport & logistics | 2024 |
| Soulshine Band Ltd | Arts & recreation | 2017 |
| Sound Foods Ltd | Hospitality | 2025 |
| Sound Steve Ltd | Information & communication | 2020 |
| Soundtrack Sync CIC | Public administration | 2025 |
| Source Models (UK) Limited | Professional & scientific | 2003 |
| South Bay CS Ltd | Hospitality | 2021 |
| South Build Projects Ltd | Construction | 2020 |
| South Coast Accountants Limited | Professional & scientific | 1999 |
| South Coast Apartments Limited | Real estate | 2021 |