| Big Nice Bees Ltd | London | 2024 |
| Big Nice Geese Ltd | London | 2024 |
| Big Nice Lucy Ltd | London | 2024 |
| Big Nice Toby Ltd | London | 2024 |
| Big Noise Limited | Pinner | 2019 |
| Big Northumberland Limited | Blyth | 2011 |
| Big Nose Productions Limited | London | 2014 |
| Big Note Music Limited | London | 1979 |
| Big Ocean Productions Limited | London | 1981 |
| Big Old Race Car Ltd | London | 2025 |
| Big on Blue Productions UK Limited | London | 2015 |
| Big Orange Events Limited | Caerphilly | 2026 |
| Big OUT Limited | London | 1995 |
| Big Oval Plate Ltd | Nottingham | 2020 |
| Big Pale Nasty Coaching Ltd | Bristol | 2024 |
| Big Pants Limited | | 2003 |
| Big Pete Limited | West Yorkshire | 2004 |
| Big Play Productions Limited | Harrow | 2024 |
| Big Pluto Limited | London | 2019 |
| Big Potato Limited | London | 2014 |
| Big Powerhouse Wrestling Ltd | Southsea | 2023 |
| Big Puns Limited | Nottingham | 2023 |
| Big Quiz Ltd | London | 2025 |
| Big Red Amusements Limited | Bridlington | 2014 |
| Big Red Bone Limited | London | 2020 |
| Big Red Curtain Ltd | Scarborough | 2008 |
| Big Red Events Ltd | Chorley | 2017 |
| Big Red Talent Limited | Bath | 2010 |
| Big Reds Gym & Fitness Limited | Walsall | 2026 |
| Big Rider Films Ltd | London | 2021 |
| Big River Recordings Limited | London | 2020 |
| Big Rock Climbing Limited | Milton Keynes | 2009 |
| Big Rock Records CIC | Dundee | 2025 |
| Big Room Productions Ltd | London | 2024 |
| Big Screen on the Green Limited | Blisworth | 2016 |
| Big Screen Project Limited | Weybridge | 2026 |
| Big Screen X Limited | Blisworth | 2019 |
| Big Shades Productions Limited | Amersham | 2017 |
| Big Shot Basketball Ltd | Maidenhead | 2023 |
| Big Shot Snooker Ltd | Birmingham | 2022 |
| Big Shot Strength Club Ltd | Belfast | 2025 |
| Big Sister Promotions Limited | Reading | 2002 |
| Big Sky Company Limited | Nottingham | 1995 |
| Big Sky Song Limited | Hollies Road, Bradwell | 2007 |
| Big Smile Collective C.I.C. | Chelmsford | 2025 |
| Big Smile Media Ltd | Glasgow | 2021 |
| Big Smoke Comedy Ltd | London | 2022 |
| Big Smoke Productions Limited | Haverhill | 2020 |
| Big Soul Productions CIC | Manchester | 2024 |
| Big Space Theatre Productions | Hove | 1997 |
| Big Sports Ltd | Congleton | 2022 |
| Big Sports Promotions Ltd | London | 2022 |
| Big Stage Productions Ltd | Herne Bay | 2017 |
| Big Star Creations Ltd | Stourbridge | 2008 |
| Big Star Entertainments Ltd. | Nottingham | 2003 |
| Big Star Speakers Limited | Stourbridge | 2024 |
| Big Stars Theatre & Dance School Limited | Hawarden | 2026 |
| Big Steew Ltd | London | 2025 |
| Big Tatts Ltd | Seaham | 2026 |
| Big TED Promotions Limited | Leeds | 2021 |
| Big Telly Theatre Company | Portstewart | 1989 |
| Big Tent Music Management Ltd | Warrington | 2007 |
| Big Throw Limited | London | 2021 |
| Big Ticket Giveaways Ltd | London | 2025 |
| Big Time Entertainment Ltd | Liverpool | 2023 |
| Big Time Events and Entertainment Ltd | Lancaster | 2018 |
| Big Time Studios Limited | London | 2024 |
| Big Time Yachting Ltd | London | 2025 |
| Big TIN Ltd | Sheffield | 2022 |
| Big TOM Productions Ltd | Holborn | 2015 |
| Big Top Decor Ltd | Birmingham | 2015 |
| Big Top Group Limited | Stafford | 2018 |
| Big Top Marquees and Decorations Limited | Birmingham | 2015 |
| Big Trash Limited | Stanmore | 1984 |
| Big Tribfest UK Limited | Plymouth | 2022 |
| Big UP Productions Limited | Surbiton | 1999 |
| Big Uproar CIC | Bristol | 2025 |
| Big Voices Musical Theatre Company CIC | Galashiels | 2024 |
| Big Wheel Spins Ltd | Rotherham | 2026 |
| Big Willie 180 Limited | Brierley Hill | 2021 |
| Big Winners UK Limited | Glasgow | 2024 |
| Big Wooden Horse (UK) Ltd | Cardiff | 2010 |
| Big WOW Events Ltd | Manchester | 2017 |
| Big Ximes Limited | Waltham Cross | 2019 |
| Bigbandeoke Ltd | London | 2024 |
| Bigbang Sports Promotions Ltd | Northallerton | 2025 |
| Bigbig Limited | Pulborough | 2006 |
| Bigboomtownproductions Limited | London | 2024 |
| Bigbox (London) Ltd | Abingdon | 2013 |
| Bigboxlilbox Ltd | London | 2020 |
| Bigbumble Ltd | Bury St. Edmunds | 2023 |
| Bigbury Bay Golf Club Limited | Kingsbridge | 2009 |
| Bigbury Bay Golf Club Trading Limited | Kingsbridge | 2016 |
| Bigday Entertainments Ltd | Nottingham | 2025 |
| Bigdom Two Ltd | Leigh On Sea | 2014 |
| Bigface Productions Ltd | Brighton | 2008 |
| Bigfoot Arts Education (North East) Ltd | East Boldon | 2012 |
| Bigfoot Cycle Club Limited | Chislehurst | 2018 |
| Bigfoot Entertainment Ltd | London | 2022 |
| Bigfoot Leisure Limited | Bourne | 2014 |