| 20 Watt Solutions Limited | Kilmarnock | 2019 |
| 20 York Road Limited | Tunbridge Wells | 2008 |
| 20-20 Geospatial Ltd | Winchester | 2018 |
| 20-20 Management Enterprise Limited | Wirral | 2015 |
| 20-20 Off-Site Limited | Nottingham | 2018 |
| 20-20 Public Relations Limited | Hungerford | 1992 |
| 20-22 Consulting Limited | Chipping Norton | 2022 |
| 20-FIFTEEN Sport Ltd | Harpenden | 2021 |
| 20/20 (International) Limited | Westhill | 2009 |
| 20/20 Business Insight Limited | Edinburgh | 2001 |
| 20/20 Commercial Management Limited | Gillingham | 2017 |
| 20/20 Communications Ltd | Oxford | 2011 |
| 20/20 E&N Solutions Limited | Cockermouth | 2024 |
| 20/20 Financial Management Ltd | Gillingham | 2022 |
| 20/20 Professional Services Ltd | Ballymoney | 2012 |
| 20/20 Project Management Limited | Buckinghamshire | 2004 |
| 20/20 Sighting Limited | Crewe | 2020 |
| 20/20 Solutions Limited | Altrincham | 2026 |
| 20/20PERFORMANCE Limited | Knutsford | 2025 |
| 20/30 Labs Limited | London | 2007 |
| 200 Consultancy Group Ltd | Sheffield | 2021 |
| 200 Design Limited | Hungerford | 2023 |
| 200 FT Limited | Belfast | 2012 |
| 2000 Overlook Ltd | London | 2018 |
| 2000WEEKS.COM Limited | Holywood | 2017 |
| 2001 Consulting Ltd | Colchester | 2016 |
| 2001 Payroll & Professional Services Limited | Watford | 1999 |
| 2002RAIL Ltd | Doncaster | 2019 |
| 20040505 Limited | Birmingham | 2007 |
| 2006 Holdings Ltd | Port Talbot | 2015 |
| 2007 GAL Limited | Craigavon | 2004 |
| 20092020 Limited | Dereham | 2022 |
| 201 Cathedral Road (Cardiff) Management Limited | South Glamorgan | 1990 |
| 2010 Consulting Ltd | London | 2023 |
| 2012 Building Services Limited | Harpenden | 2017 |
| 2012 Law Limited | Bicester | 2012 |
| 2013 POP UP Limited | Deeside | 2014 |
| 202 Energy Ltd | Coventry | 2025 |
| 202 Taxis Ltd | Edinburgh | 2015 |
| 2020 Accountancy (Southern) Ltd | Bournemouth | 2021 |
| 2020 Accounting Ltd | Swansea | 2020 |
| 2020 Associates Ltd | Hawkhurst | 2022 |
| 2020 Creativ Ltd | Darlington | 2021 |
| 2020 Design Trading Limited | Harrow | 2020 |
| 2020 Enterprises Limited | Gerrards Cross | 2009 |
| 2020 Executive Search Limited | Norwich | 2019 |
| 2020 Futures Ltd | Stourbridge | 2018 |
| 2020 Growth Limited | London | 2025 |
| 2020 Management Solutions Ltd. | | 2002 |
| 2020 Mediaworks Limited | Glasgow | 2020 |
| 2020 Monitoring Limited | Bury | 2020 |
| 2020 Moore Limited | Chelmsford | 2021 |
| 2020 Photographic Limited | Farnborough | 2008 |
| 2020 Plan Limited | Windermere | 2020 |
| 2020 Re:Think Limited | London | 2017 |
| 2020 Recruitment Limited | Glenrothes | 2025 |
| 2020 Research Ltd | Hastings | 2020 |
| 2020 Risk Limited | Maidenhead | 2020 |
| 2020 Risk Management Ltd | Peterculter | 2019 |
| 2020 Safety Training Ltd | Norwich | 2020 |
| 2020 Vision Business Services Limited | Nottingham | 2026 |
| 2020 Visuals Limited | Leicester | 2014 |
| 2020CONSULT Ltd | Cheltenham | 2020 |
| 2020MEDIA Limited | London | 2003 |
| 2021 Taxation Limited | London | 2021 |
| 2023 Dkndgb Ltd | Worcester | 2023 |
| 2025 Nominees Limited | London | 2025 |
| 202C Limited | Towcester | 2021 |
| 203 Richmond Road Limited | Surrey | 2004 |
| 2030 Architects Limited | Penrith | 2009 |
| 2030 Consulting Limited | Horsham | 2020 |
| 2030 Ventures Ltd. | Liverpool | 2017 |
| 2030 Vision Limited | Bradford | 2020 |
| 2030DESIGNS Limited | Leeds | 2023 |
| 2031 Limited | Loughborough | 2020 |
| 2032 Programme Solutions Limited | Brighouse | 2025 |
| 2035 Assessments Limited | Bury St. Edmunds | 2020 |
| 2040 Leaders CIC | London | 2025 |
| 2041 Ltd | Livingston | 2026 |
| 20420 Holdings Limited | Eastbourne | 2022 |
| 205 Ravenscroft Road Beckenham (Freehold) Ltd | Bromley | 2011 |
| 205 South Croxted Road Limited | London | 2015 |
| 2050 Capital Limited | London | 2015 |
| 2050 Limited | Bewdley | 2018 |
| 2050 Logistics Limited | Stoke-On-Trent | 2009 |
| 2050 Ventures Limited | London | 2020 |
| 2050.CLOUD Ltd | London | 2019 |
| 206 Consultancy Limited | Liverpool | 2026 |
| 207 & 209 Brentwood Road Limited | Romford | 2008 |
| 207 Church Road (Management) Limited | London | 1990 |
| 2070PARTNERS Ltd | Haywards Heath | 2018 |
| 2095 Consulting Limited | Malmesbury | 2025 |
| 20:20 Accountancy Solutions Ltd | Barnet | 2012 |
| 20:20 Financial Coaching Ltd | Huddersfield | 2024 |
| 20:20 Hindsight Ltd. | London | 2014 |
| 20FIFTY Limited | Leeds | 2020 |
| 20POUNDS Ltd | London | 2012 |
| 20QUESTIONS Ltd | London | 2024 |
| 20SENSES Limited | Horsham | 2014 |
| 20SMOTION Limited | Gravesend | 2026 |