| Rares Logistics Ltd | Transport & logistics | 2025 |
| Rats Marine Limited | Professional & scientific | 2018 |
| Ravengrounds Limited | Information & communication | 2017 |
| RBN Catering Ltd | Hospitality | 2025 |
| Red COW Development Ltd | Professional & scientific | 2024 |
| Red Sea Container Terminals Overseas Limited | Financial services | 2023 |
| Redbeam Property Ltd | Real estate | 2026 |
| Redemption Media Limited | Information & communication | 2007 |
| Redvers Graham Property Ltd | Real estate | 2021 |
| Refcool Solutions Ltd | Manufacturing | 2026 |
| Reference Request Ltd | Information & communication | 2024 |
| Remindful Ltd | Health & social care | 2024 |
| Rengo Limited | Hospitality | 2026 |
| Rentrite Ltd | Construction | 2013 |
| Reporter Journalism Ltd | Information & communication | 2012 |
| Reunite Nature Ltd | Wholesale & retail | 2024 |
| Ricardas M Ltd | Transport & logistics | 2017 |
| Richardson Agriculture Ltd | Agriculture & fishing | 2026 |
| Ricsi Ltd | Transport & logistics | 2023 |
| RID Ventures Ltd | Wholesale & retail | 2025 |
| Rigrite Services Limited | Transport & logistics | 1991 |
| RIS 6 Limited | Transport & logistics | 2019 |
| Riverdale Counselling Ltd | Professional & scientific | 2020 |
| RJD Building Limited | Construction | 2014 |
| RM Autos Group Limited | Wholesale & retail | 2019 |
| ROB Allan HR Services Limited | Professional & scientific | 2006 |
| Robertbestsolution Ltd | Transport & logistics | 2019 |
| Romanik Drivers Limited | Transport & logistics | 2015 |
| Romeo Drivers Limited | Transport & logistics | 2014 |
| Romeo Transport Limited | Transport & logistics | 2023 |
| Roseberry Cottage Enterprise Limited | Health & social care | 2015 |
| Rosebery Court Management Limited | Households | 1995 |
| Roselea Nursery Limited | Wholesale & retail | 2017 |
| Rper Ltd | Wholesale & retail | 2020 |
| RRD Financial Limited | Administrative & support | 2026 |
| RS Freight Logistics Ltd | Transport & logistics | 2023 |
| RSC Logistics Ltd | Transport & logistics | 2020 |
| Rushbrooks Residential Management Limited | Households | 2018 |
| RWK Services Limited | Professional & scientific | 2016 |
| RWK Transport Ltd | Transport & logistics | 2014 |
| Ryterka Ltd | Transport & logistics | 2018 |
| S a Elles Ltd | Financial services | 2012 |
| S a W Transport (UK) Ltd | Transport & logistics | 2009 |
| S Bett Mortgages Felixstowe Ltd | Financial services | 2020 |
| S Brownlee Building Contractors Ltd | Construction | 2022 |
| S E a Transport Holdings Limited | Financial services | 2022 |
| S E a Transport Investments Limited | Financial services | 2022 |
| S E a Transport Limited | Transport & logistics | 2001 |
| S&D Workers Limited | Transport & logistics | 2012 |
| S. Harrold Plumbing & Heating Ltd | Construction | 2009 |
| S. Walker Holdings Ltd | Real estate | 2023 |
| S.M.T. Amusements Limited | Professional & scientific | 1965 |
| Safetow Marine Limited | Professional & scientific | 2023 |
| Safty Driver Ltd | Transport & logistics | 2014 |
| Salon Twenty 6 Ltd | Other services | 2021 |
| Salvage Tugs Limited | Extraterritorial | 2010 |
| Sandi Mandi Ltd | Transport & logistics | 2017 |
| Sands Bar & Grill Limited | Hospitality | 2019 |
| Sarmathia Ltd | Transport & logistics | 2017 |
| Saro Group Limited | Hospitality | 2025 |
| SAS Building Services Ltd | Construction | 2020 |
| SAS Transport Services Limited | Transport & logistics | 2025 |
| SB Development Consultancy Ltd | Administrative & support | 2023 |
| SC Construction Solutions Limited | Construction | 2009 |
| Scanwell Logistics (FXT) Limited | Transport & logistics | 2019 |
| Scanwell Logistics (LHR) Limited | Transport & logistics | 2014 |
| Schallenberg International Ltd | Transport & logistics | 1983 |
| Scott & Mccracken Limited | Real estate | 2017 |
| Scott Installations Limited | Construction | 2021 |
| Sea Kargo Ltd | Administrative & support | 2011 |
| Seafast Cold-Chain Logistics Limited | Transport & logistics | 2009 |
| Seafast Global Limited | Transport & logistics | 2013 |
| Seafast Holdings Limited | Professional & scientific | 2008 |
| Seafast Liner Agency Limited | Transport & logistics | 2014 |
| Seafast Logistics Limited | Transport & logistics | 2007 |
| Seafast Shipping Limited | Transport & logistics | 2000 |
| Seagull Villa Ltd | Households | 2022 |
| Seaport Freight Services Limited | Transport & logistics | 1981 |
| Seaport Logistics Ltd | Transport & logistics | 2010 |
| Seareside Property Limited | Real estate | 2020 |
| Seaside Golden Fish Bar Ltd | Hospitality | 2024 |
| Sebcas Ltd | Transport & logistics | 2026 |
| Selectareg Limited | Wholesale & retail | 2020 |
| Selective Registrations Limited | Wholesale & retail | 2020 |
| Seven Star Logistics Ltd | Transport & logistics | 2022 |
| Seventh Sense Limited | Information & communication | 2001 |
| SF Coaching Ltd | Other services | 2023 |
| SGB Arch Trading Ltd | Wholesale & retail | 2026 |
| Shine Educational Psychology Ltd | Education | 2024 |
| Ship Felixstowe Limited | Transport & logistics | 2020 |
| Shipping Supermarket Ltd | Professional & scientific | 2019 |
| Ships Fish Limited | Extraterritorial | 2020 |
| Ships for Sale and Charter Limited | Transport & logistics | 2020 |
| Ships for Scrap Limited | Wholesale & retail | 2020 |
| Ships Insure Limited | Extraterritorial | 2020 |
| Shore Logistics Limited | Transport & logistics | 2011 |
| Shrublands Transport Services Limited | Transport & logistics | 2019 |
| Sierra Game Supplies Ltd | Wholesale & retail | 2022 |
| Signals UK Limited | Wholesale & retail | 2003 |
| Signaturedecorators Ltd | Construction | 2020 |