| 30 Hertz Limited | Stockport | 1994 |
| 30 Logistics Ltd | Bromley | 2025 |
| 30 NIX Ltd | London | 2021 |
| 30 Rounds Military Fitness Limited | High Wycombe | 2026 |
| 30-MINUTE Crew Ltd | Ilkeston | 2022 |
| 30/40 Productions Limited | Lichfield | 2023 |
| 300 Fitness C.I.C. | Middlesbrough | 2025 |
| 300 Sparta Health and Fitness Limited | Enfield | 2011 |
| 3000 Limited | Manningtree | 2008 |
| 301 Pictures Ltd | London | 2021 |
| 303 Content Creation Ltd | Welling | 2024 |
| 303 Projects CIC | Lowestoft | 2021 |
| 306 Touring Limited | Abingdon | 2025 |
| 306TH Bomb Group Museum Limited | Bedford | 2019 |
| 30FIRE Ltd | London | 2026 |
| 30PLUS Mens Fitness Limited | Dunmow | 2013 |
| 31 North Group Ltd. | Southampton | 2018 |
| 31132 Alberta Ltd | Cinderford | 2011 |
| 312 Investments Limited | Northwood Hills | 2025 |
| 3156 Athlete Management Limited | Sunderland | 2024 |
| 3156 Promotions Limited | Hull | 2026 |
| 316MC Limited | Kings Langley | 2017 |
| 32 BIT Ltd | Woodford Green | 2004 |
| 32 Rigging Ltd | Hemel Hempstead | 2021 |
| 32 Sports Management Limited | Middlesbrough | 2016 |
| 3200 Ltd | Weymouth | 2014 |
| 3228 Limited | Stanmore | 2025 |
| 324 Activities Limited | London | 2024 |
| 326 Group Ltd | Essex | 2018 |
| 328 Investments Limited | Westerham | 2024 |
| 32B UN Ltd | Camden | 2020 |
| 32Q Ltd | Blackpool | 2019 |
| 33 1/3RD Limited | London | 2012 |
| 33 Bound Ltd. | London | 2018 |
| 33 Creative Studio Ltd | Winchester | 2022 |
| 33 Entertainment Group London Ltd | Maldon | 2016 |
| 33 Entertainment Limited | London | 2017 |
| 33 Fitness Limited | Doncaster | 2024 |
| 33 Macaulay Limited | London | 2025 |
| 33 Motorsport Limited | Belfast | 2014 |
| 33 Pixels Ltd | Colchester | 2017 |
| 33 Promotions Limited | Carmarthen | 2020 |
| 33 Reasons Ltd | Northampton | 2022 |
| 33 Victory Ltd | Otley | 2024 |
| 335 Live Ltd | Glasgow | 2025 |
| 335 Promotions Ltd | Pontefract | 2024 |
| 3388 Ltd | Glasgow | 2020 |
| 33DPA Ltd | London | 2023 |
| 33RD Management Limited | Dorchester | 2015 |
| 345 Golf Limited | London | 2018 |
| 345 Nations CUP Limited | London | 2017 |
| 349 Barbell Ltd | Andover | 2021 |
| 34A Trading Limited | Belfast | 2017 |
| 351 Days Ltd | Glasgow | 2024 |
| 351 Sails and Services Limited | Poole | 2022 |
| 357 Limited | Montgomery | 1997 |
| 357INK Ltd | London | 2026 |
| 36 Inch Penguin Ltd | Tunbridge Wells | 2021 |
| 360 Booth MCR Ltd | Stockport | 2026 |
| 360 Degree Health Club Solutions Limited | Whistable | 2015 |
| 360 Degree Sports Coaching CIC | Southampton | 2018 |
| 360 Degree Worshipper CIC | Radlett | 2025 |
| 360 Degrees Trust Trading (Devon) Limited | Beaworthy | 2006 |
| 360 Education C.I.C. | Bristol | 2019 |
| 360 Endeavours Limited | London | 2012 |
| 360 Event Hire Ltd | Glasgow | 2020 |
| 360 Fit (Essex) Limited | Billericay | 2020 |
| 360 Fit Ltd | Moreton-In-Marsh | 2023 |
| 360 Football Juniors Limited | London | 2024 |
| 360 Health Club Limited | Derby | 2012 |
| 360 Music Festival Events Ltd | London | 2023 |
| 360 NR Limited | Stockport | 2020 |
| 360 Partnerships Limited | London | 2017 |
| 360 Personal Coaching Limited | Bury | 2022 |
| 360 Play (Basildon) Limited | Milton Keynes | 2013 |
| 360 Play (Birmingham) Limited | Milton Keynes | 2026 |
| 360 Play (Farnborough) Limited | Milton Keynes | 2017 |
| 360 Play (Leicester) Limited | Milton Keynes | 2012 |
| 360 Play (Milton Keynes) Limited | Milton Keynes | 2013 |
| 360 Play (Redditch) Limited | Milton Keynes | 2016 |
| 360 Play (Rushden Lakes) Limited | Milton Keynes | 2016 |
| 360 Play (Stevenage) Limited | Milton Keynes | 2010 |
| 360 Racing Club Ltd | Moreton-In-Marsh | 2022 |
| 360 Snapz Services Ltd | London | 2022 |
| 360 Sound Ltd | London | 2023 |
| 360 Sports Education Limited | Farnham | 2015 |
| 360 Ultimate Fitness Limited | Staines-Upon-Thames | 2014 |
| 360 Wild (Spalding) Limited | Milton Keynes | 2026 |
| 360CHARGE Fitness Ltd | Newbury | 2024 |
| 360CRICKET Ltd | Wimborne | 2019 |
| 360FIZZ Ltd | Cardiff | 2018 |
| 360R Ltd | London | 2025 |
| 36251 Limited | Huddersfield | 2023 |
| 363 Fitness Limited | Cambridge | 2026 |
| 365 Athlete Hub Ltd | Newtown | 2023 |
| 365 Athletics Academy Limited | West Wickham | 2009 |
| 365 Competitions Limited | Ipswich | 2026 |
| 365 Crew Ltd | Plymouth | 2025 |
| 365 Fitness HH Ltd | Southampton | 2021 |
| 365 Football Management Limited | Belfast | 2017 |