| Active Mums Ltd | Brentford | 2021 |
| Active Nation UK Ltd | Wythenshawe | 1995 |
| Active Netball Leagues Limited | London | 2025 |
| Active Netball UK Limited | London | 2020 |
| Active Northumberland | Newcastle Upon Tyne | 2013 |
| Active NRG Ltd | Sutton Coldfield | 2025 |
| Active Outdoors Ltd. | Bury St. Edmunds | 2015 |
| Active Paddling Ltd. | Wimborne | 2017 |
| Active Padel Ltd | Beckenham | 2023 |
| Active Parks Ltd | Elgin | 2017 |
| Active Partnerships | Loughborough | 2011 |
| Active Performance Consultancy Ltd | London | 2018 |
| Active Pulse EMS Ltd | Manchester | 2025 |
| Active Rainbow Enterprise CIC | Huddersfield | 2022 |
| Active Resilience Limited | St. Albans | 2026 |
| Active Risk Management Services Limited | Berkshire | 2006 |
| Active Sealion Ltd | Northolt | 2019 |
| Active Self Defence UK Ltd | Pontyclun | 2014 |
| Active Simulators Europe Ltd | Portsmouth | 2019 |
| Active Simulators Limited | Portsmouth | 2006 |
| Active Softplay Ltd | Royston | 2020 |
| Active South West Ltd | Taunton | 2024 |
| Active Spirits Events Limited | Glasgow | 2026 |
| Active Sport & Entertainment Limited | London | 2016 |
| Active Sport Capital Limited | London | 2020 |
| Active Sport Centre Limited | Liverpool | 2014 |
| Active Sports Camp Limited | Cullercoats | 2008 |
| Active Sports FC Limited | Leytonstone | 2024 |
| Active Sports Trust Limited | Solihull | 2011 |
| Active Stirling Limited | Stirling | 2006 |
| Active Stories Ltd | Emsworth | 2016 |
| Active Strides Limited | Henley-On-Thames | 2020 |
| Active Support 16+ Ltd | Luton | 2009 |
| Active Swim Dolphin Limited | Ruislip | 2017 |
| Active Swim Limited | Ruislip | 2016 |
| Active Swim Seahorse Ltd | Ruislip | 2019 |
| Active Torridge Ltd | Bideford | 2022 |
| Active Training and Education | Coventry | 1997 |
| Active Training Network Ltd | Ormskirk | 2015 |
| Active Unlimited Ltd | London | 2025 |
| Active Wellbeing Cwmcarn CIC | Newport | 2026 |
| Active With NIC Limited | Glasgow | 2026 |
| Active Within C.I.C. | London | 2016 |
| ACTIVE1ST Limited | London | 2015 |
| ACTIVE4KIDS Limited | Blackburn | 2025 |
| ACTIVE4LUTON Limited | Luton | 2013 |
| ACTIVE4SPORT International Ltd | Cowbridge | 2022 |
| Activeace Tennis Academy Ltd | Nottingham | 2008 |
| Activebodyhealthymind Ltd | Sutton Coldfield | 2017 |
| Actively Seeking... CIC | London | 2019 |
| Activenewham | London | 2012 |
| Activents Ltd | Bridlington | 2025 |
| Activerse Productions Ltd | Kingston Upon Thames | 2024 |
| Activespace (Richings Park) Ltd | Stanmore | 2026 |
| Activetots Limited | Stockport | 2012 |
| Activetrainingworld Limited | Harpenden | 2011 |
| Activfitgyms Ltd | Milton Keynes | 2024 |
| Activise Ltd | Bognor Regis | 2006 |
| Activities 4 Children (Sheffield) Limited | Sheffield | 2007 |
| Activities in Lakeland Ltd | Grange-Over-Sands | 2000 |
| Activities Venture Limited | Stamford | 2020 |
| Activitots Ltd | Chelmsford | 2016 |
| Activity Advisor Limited | Coventry | 2006 |
| Activity Escapes Ltd | St. Austell | 2025 |
| Activity for ALL AP Ltd | Wirral | 2016 |
| Activity for ALL Hub CIC | Wirral | 2012 |
| Activity for ALL WA Ltd | Wirral | 2023 |
| Activity Hub 4 Kids Ltd | Chigwell | 2016 |
| Activity Hub Scotland Ltd | Edinburgh | 2020 |
| Activity Leisure Group Ltd | Slough | 2018 |
| Activity Parks Limited | Scarborough | 2012 |
| Activity Residential Camp Adventures Ltd | Llangammarch Wells | 2017 |
| Activity Shooting Limited | Heydon | 2015 |
| Activity Time Limited | Portsmouth | 1996 |
| Activity Wales Events Limited | Haverfordwest | 2013 |
| Activity Works | Bury | 2014 |
| Activity World Ltd. | Cambs | 1990 |
| Activlearning Limited | Guildford | 2024 |
| Activmethod Ltd | Guildford | 2026 |
| Activscotland Ltd | Glasgow | 2016 |
| Activsports Ltd | Market Drayton | 2014 |
| Acton Ballet School Limited | London | 2016 |
| Acton Cricket Club Limited | Acton | 2025 |
| Acton Netball Limited | London | 2010 |
| Acton Sports Club Ltd | Northolt | 2022 |
| Actonians Womens and Girls Football Club Ltd | London | 2026 |
| Actor Tribe Limited | Bolton | 2013 |
| Actor's Club Limited | Cheam | 2016 |
| Actoratthecentre Ltd | London | 2022 |
| Actors ACT Studio Ltd | London | 2026 |
| Actors File Limited(The) | London | 1983 |
| Actors in Business Ltd | Frome | 2015 |
| Actors International Limited | Maidstone | 2000 |
| Actors Station Ltd | Farnham | 2021 |
| Actors Touring Company (London) Limited | London | 1980 |
| Actors' Toolkit Ltd | Swanscombe | 2019 |
| Actorsfit Limited | Poulton-Le-Fylde | 2022 |
| Actorum Limited | West Hampstead | 1981 |
| Acts and Entertainment Limited | Birmingham | 2008 |
| Acts Nottingham Ltd | Nottingham | 2023 |