| 1ST Option Limited | Caterham | 1994 |
| 1ST Packaging Ltd | Chinnor | 2008 |
| 1ST Plant and Tool Services Ltd | Paisley | 2023 |
| 1ST Quality Fabrication & Engineering Ltd | London | 2012 |
| 1ST RDS Limited | Perth | 2013 |
| 1ST Response Site Services Limited | London | 2011 |
| 1ST Security Shutters Limited | Cheshire | 2025 |
| 1ST Signals Ltd | Romford | 2014 |
| 1ST Star Global Ltd | Canterbury | 2022 |
| 1ST Stop Glass Limited | Stalybridge | 2008 |
| 1ST Stop Security Products Limited | St. Helens | 2000 |
| 1ST Summerhouses Limited | Dumbarton | 2006 |
| 1ST Supplies Industrial Ltd | Blackwood | 2015 |
| 1ST Uniform Company Limited | Wolverhampton | 2019 |
| 1ST Vodka Limited | Matlock | 2023 |
| 1ST Waterside Limited | Hythe | 2001 |
| 1ST Workwear Limited | Lichfield | 2014 |
| 1ST World Textile Limited | London | 2025 |
| 1ST-GEAR.NET Limited | St. Austell | 2000 |
| 1STATWIND Ltd | Irvine | 2025 |
| 1STGO Medical Supplies Limited | Rotherham | 2025 |
| 1STMAN Ltd | Stroud | 2021 |
| 1STMIXCONCRETE Ltd | Liverpool | 2021 |
| 1STOCK Limited | Durham | 2024 |
| 1STOP Glazing Limited | Ilford | 2016 |
| 1STOPWIND Ltd | Renfrew | 2017 |
| 1TO1MUSIC Ltd | Belfast | 2013 |
| 1UP Audio Ltd | Derby | 2022 |
| 1UP Natural Products Ltd | Carlisle | 2019 |
| 1V1 London Ltd | Newcastle Upon Tyne | 2026 |
| 1VSN Ltd | London | 2025 |
| 1WAY Motion Ltd | London | 2025 |
| 1WAY.LDN Ltd | London | 2025 |
| 1WORLDPRINT Ltd | London | 2020 |
| 2 Agriculture Milling Limited | Birmingham | 2016 |
| 2 Bears Company Private Limited | London | 2020 |
| 2 Box Ltd | London | 2007 |
| 2 Brothers Coatings Ltd | Sheffield | 2010 |
| 2 CD Limited | Birmingham | 2020 |
| 2 Degrees West Apparel Limited | Worcester | 2023 |
| 2 Excel Engineering Limited | London | 2014 |
| 2 Fast Delivery Limited | Edgware | 2022 |
| 2 FIX Solutions Limited | Ilford | 2024 |
| 2 Forty One Ltd | Halifax | 2009 |
| 2 G Fabrications Limited | Ashton-Under-Lyne | 2005 |
| 2 I'S Rental Limited | Northampton | 2013 |
| 2 Innovative (Leic) Ltd | Leicester | 2019 |
| 2 MEN and a Grill Ltd | Belfast | 2022 |
| 2 Much Hassle Composites Limited | Gosport | 2025 |
| 2 Point 8 Ltd | Kilmacolm | 2020 |
| 2 Sisters Fish Limited | Wakefield | 2010 |
| 2 Sisters Food Group Limited | Wakefield | 1993 |
| 2 Sisters Poultry Limited | Blairgowrie | 2013 |
| 2 Sisters Printing Ltd | Newbury | 2023 |
| 2 Surface (London) Limited | Nottingham | 2013 |
| 2 Surface Leather Ltd | Nottingham | 2012 |
| 2-SPEC Limited | Birmingham | 2007 |
| 2.0 Customz Limited | Bolton | 2025 |
| 2.J.F. Limited | Hemel Hempstead | 1999 |
| 2.K. Tools (Coventry) Limited | Nuneaton | 1976 |
| 20 20 Plastics Limited | Newton Abbot | 2001 |
| 20/20 Fitness Services Limited | Warmley | 2016 |
| 200 Degrees Coffee Roasters Limited | London | 2007 |
| 2020 Bespoke Ltd | Newbury | 2021 |
| 2020 Cacao House Limited | Leamington Spa | 2022 |
| 2020 Carvision Limited | Tamworth | 2010 |
| 2020 Certification Limited | Penarth | 2018 |
| 2020 Horizons Ltd | Worcester | 2017 |
| 2020 Vision Lighting Limited | Glasgow | 2020 |
| 2020ENGINEERING Ltd | Brechin | 2017 |
| 20MPH Technical Solutions Ltd | Cambridge | 2021 |
| 20POINT9 Ltd | Widnes | 2010 |
| 20TH Century Fireplaces Ltd | Ware | 2021 |
| 20TH Century Frames Limited | London | 2008 |
| 21 Aero Limited | Warrington | 2022 |
| 21 FC Ltd | Manchester | 2018 |
| 21 GTX Limited | Bourne | 2024 |
| 21 GUN Refrigeration Ltd | Sheffield | 2020 |
| 21 Hands Limited | London | 2012 |
| 21 Publishing Limited | London | 1996 |
| 21 Road Limited | London | 2017 |
| 21 RUG Street Ltd | Newport | 2023 |
| 215HACKNEY Ltd | London | 2020 |
| 21BEADS Ltd | Harlow | 2024 |
| 21C Innovations Ltd | Stroud | 2017 |
| 21CEC PX Pharm Ltd | Pevensey | 2003 |
| 21K Hair One Limited | London | 2019 |
| 21MD Limited | London | 2026 |
| 21ST Century Metal Treatments Ltd | Birmingham | 2020 |
| 21ST Century Coke Co. Ltd. | Barnstaple | 1999 |
| 21ST Century Electrical Ltd | Northwood | 2014 |
| 21ST Century FIX Limited | Lymington | 2000 |
| 21ST Century Music Publishing Limited | West Midlands | 1999 |
| 21ST Century New Media Limited | Hemel Hempstead | 2000 |
| 21ST Century Print Limited | Northampton | 2016 |
| 21ST Century Steam Limited | Darlington | 2018 |
| 21ST Century Technology Limited | Ashby-De-La-Zouch | 2017 |
| 21ST Century Windows Ltd | Poulton-Le-Fylde | 1987 |
| 21STUDIO Photo LAB Limited | London | 2020 |
| 22 Arches Brewing Limited | Stockport | 2021 |