| Rubix Industrial Services LimitedOldbury, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1995 |
| Ryder Cup Europe LLPSurrey, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2004 |
| Sacla UK LtdBeaconsfield, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1991 |
| Saf LtdNormandy, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1993 |
| Safestore LtdBorehamwood, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Saint John Jacob the Romania N Fromhozeva FoundationLeighton Buzzard, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Saison Wines LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2024 |
| Salento Food and Wine LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2018 |
| Santa Rita Europe LimitedOxford, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2003 |
| Sapori LtdLeeds, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2015 |
| Scarab Sweepers LtdTonbridge, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1984 |
| Schenker LtdHounslow, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1943 |
| Scott and Newman LtdShrewsbury, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1973 |
| Scrawny Al LtdFrome, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1995 |
| Sdh Enterprise LimitedExeter, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2019 |
| Seabrook Wines LimitedOxford, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Seaco Global LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1998 |
| Sealing Solutions LtdBraintree, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1997 |
| Seaport Freight Services LtdFelixstowe, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1981 |
| Seasoned Events LimitedOngar, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2000 |
| Seewoo Chinatown LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Sefar LtdBury, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1985 |
| Selection Prestige GMBHBerlin, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2013 |
| Send & Receive Worldwide Express UkltdUxbridge, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Sete LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Seven Heaven Trading LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Shajan Indian Restaurant LtdBlackburn, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1998 |
| Shanghai Me Restaurant LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2024 |
| Sheldon Clayton Holdings LtdWest Bromwich, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2009 |
| Shenton Global LimitedAndover, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2016 |
| Shops For All LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Shota LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2018 |
| Shwen Shwen LimitedFaversham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2020 |
| Sibbald LimitedBlackridge, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1997 |
| Sicor International LimitedPlynouth, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1993 |
| Signatory Vintage Scotch Whisky Co LtdPerth & Kinross, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1988 |
| Signature Flatbreads LtdDunstable, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Signature Flight Support London Luton LimitedLuton, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1988 |
| Sikelaia Wine LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2021 |
| Silverlands Consulting LimitedRamsden Bellhouse, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2020 |
| Silverstone Circuits LimitedNorthamptonshire, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1966 |
| Silvertrees 2024 LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Simarco International LtdWitham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1997 |
| Simply Conference & Corporate Eventsupport LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2002 |
| Simpson Thacher & Bartlett LLPNew York, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Sippa Club LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Skylogistix GMBHNeu-Isenburg, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2010 |
| Slater MenswearUnited Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1973 |
| Slc Turnberry LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1997 |
| Smart Directions LimitedLuton, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2003 |