| Big H and Little R (Talent) Limited | Friern Barnet | 2024 |
| Big H and Little R Ltd | Friern Barnet | 2024 |
| Big Hair Don'T Care Ltd | Solihull | 2019 |
| Big Hair Styles Limited | Bristol | 2012 |
| Big Heart CIC | Telford | 2025 |
| Big Heart Fundraising Ltd | Stanmore | 2022 |
| Big Image Expo PVT Ltd | London | 2024 |
| Big in Nippon Limited | London | 2007 |
| Big Independent Living Outcomes Limited | London | 2019 |
| Big Interior Services Limited | Greater Manchester | 2009 |
| Big Issue Trust | London | 1994 |
| Big Jazz Ltd | Milton Keynes | 2023 |
| Big Jim's Trim's Ltd | London | 2022 |
| Big JOE Barber's Shop Ltd | Belvedere | 2019 |
| Big JOE Cleaning Services Ltd | London | 2009 |
| Big Life Songs Ltd | London | 2022 |
| Big Light on C.I.C. | Burnley | 2010 |
| Big Lily Foundation C.I.C. | Belfast | 2017 |
| Big Little Fish Television Ltd | London | 2019 |
| Big Love Charity | London | 2019 |
| Big MAC Promotions Limited | Aldershot | 2022 |
| Big Mama & Sweet Mama Ltd | London | 2012 |
| Big Mind Ltd | London | 2017 |
| Big NAS Turkish Barber Ltd | Motherwell | 2025 |
| Big Noise Films Limited | Leigh | 2012 |
| Big Noise Rehearsal Studios Limited | Northampton | 2015 |
| Big on Beds Ltd | Birmingham | 2018 |
| Big Padlock (Dartford) Limited | Bromley | 2024 |
| Big Padlock (UK) Ltd | Bromley | 2011 |
| Big Padlock Alpenmile Ltd | Bromley | 2025 |
| Big Padlock AYR Ltd | Bromley | 2013 |
| Big Padlock Limited | Bromley | 2012 |
| Big PAW Dog Care Ltd | Faringdon | 2013 |
| Big PAW Little PAW Ltd | Hounslow | 2021 |
| Big Picture Insight Ltd | Farnham | 2023 |
| Big Picture Invest Limited | Sheffield | 2018 |
| Big PIG Studios Limited | London | 2017 |
| Big Pike Limited | Long Bennington | 2025 |
| Big Planet Solutions Limited | Pinner | 2014 |
| Big Red Back ROW Ltd | Leigh-On-Sea | 2014 |
| Big River Services UK Limited | Manchester | 2016 |
| Big Science Entertainment UK Limited | Sunderland | 2019 |
| Big Shift Limited | London | 2020 |
| Big Shot Productions Limited | Weybridge | 1991 |
| Big Show Ltd | Southminster | 2016 |
| Big Sisters Limited | Maidstone | 2022 |
| Big Sky Games Limited | Hayling Island | 2019 |
| Big Sky Quality Solutions Ltd | Driffield | 2020 |
| Big Splash Communications Limited | Worcestershire | 2007 |
| Big Squeeze Limited | Hebden Bridge | 2016 |
| Big Star Barber 26 Ltd | Blackpool | 2026 |
| Big Star Touring Limited | London | 2018 |
| Big Stone Limited | Hope Valley | 2002 |
| Big Strong Lasses CIC | London | 2025 |
| Big T Projects Ltd | London | 2021 |
| Big Teeth Media Limited | Edinburgh | 2018 |
| Big Tentacle Limited | London | 2025 |
| Big TIM Construction Limited | St. Helens | 2017 |
| Big Time Graphics Limited | Cheshunt | 2013 |
| Big Top Events Limited | Pudsey | 2018 |
| Big Wave Global Ltd | Manchester | 2023 |
| Big Wave Property Limited | London | 2018 |
| Big White Van MAN Limited | Redcar | 2014 |
| Big WIG Investments Limited | Esher | 2012 |
| Big WOW Ltd | London | 2021 |
| Big Youth Lifting Ltd | Bristol | 2022 |
| Big ‘N’ Little Laundry Limited | Poole | 2018 |
| BIG3 Global Limited | Romford | 2025 |
| Bigbang Hopetoun Limited | Edinburgh | 2018 |
| Bigben Flowers Ltd | Southall | 2020 |
| Bigbirdluxe Ltd | London | 2026 |
| Bigbytes Ltd | Glasgow | 2014 |
| Bigc Services Ltd | London | 2022 |
| Bigcheese Solutions Limited | Aylesbury | 2010 |
| Bigdataviz Ltd | Enfield | 2016 |
| Bigdog Studios Limited | London | 2025 |
| Bigdude & Co Ltd | London | 2018 |
| Bigfoot's Repairs Ltd | Wickham | 2021 |
| Bigg Boss Salon and Haircut Ltd | Fraserburgh | 2025 |
| Bigga Diamond Printing Limited | Warrington | 2020 |
| Bigga Greenkeepers Benevolent Fund Limited | York | 2013 |
| Biggaloy Ltd | London | 2025 |
| Biggar Cars Limited | Biggar | 2011 |
| Biggar Economics Trustees Limited | Edinburgh | 2025 |
| Biggar MIC Ltd | Forth | 2021 |
| Biggboss Reggie Ltd | Tonbridge | 2021 |
| Bigger Brighter Bolder Ltd | Wantage | 2009 |
| Bigger Education Ltd | Peterborough | 2025 |
| Bigger Than Life Ltd | Witney | 2019 |
| Biggie Barbers Limited | London | 2021 |
| Biggin Hill Air Taxis Limited | Biggin Hill | 2008 |
| Biggin Hill Airport Limited | Biggin Hill | 1994 |
| Biggles Hair Studio Limited | Kidlington | 2013 |
| Biggleswade Barbering Company Ltd | Biggleswade | 2019 |
| Biggleswade Beauty Ltd | Biggleswade | 2019 |
| Biggleswade Management Company Limited | Milton Keynes | 2019 |
| Biggleswade Masonic Centre Limited | Biggleswade | 2008 |
| Biggoxx Ltd | Bromley | 2016 |
| Biggs Productions Limited | London | 2025 |
| Biggysmallz Corporate Hospitality Ltd | Middlesbrough | 2022 |