| Big Blue Surf School Limited | Bude | 2013 |
| Big Brain Innovations Ltd | Bicester | 2023 |
| Big Brain Languages Ltd | London | 2018 |
| Big Brains Tuition Limited | Edgware | 2013 |
| Big BRO Culture Ltd | London | 2025 |
| Big Brother Little Brother CIC | London | 2026 |
| Big Bruda Community Interest Company | Croydon | 2026 |
| Big Clever Learning Limited | London | 2015 |
| Big Comedy Shop UK Limited | Manchester | 2025 |
| Big Condo Training Academy CIC | Liverpool | 2019 |
| Big Creative Academy | London | 2012 |
| Big Creative Training Ltd | London | 2000 |
| Big Dave CIC | Birmingham | 2016 |
| Big Dream Academy Ltd | London | 2025 |
| Big Education Products Limited | London | 2021 |
| Big Education Programmes Limited | London | 2021 |
| Big Education Trust | London | 2011 |
| Big Fish Academy Limited | Grays | 2025 |
| Big Fish Academy of Darts Ltd | Rickmansworth | 2026 |
| Big Fish Learning Ltd | London | 2024 |
| Big Fish Tutors Limited | Wembley | 2015 |
| Big Green Adventures Ltd | Newquay | 2022 |
| Big HAT Bushcamp Limited | Bagshot | 2012 |
| Big Heart, Little Minds C.I.C. | Broxburn | 2023 |
| Big Hearted Living Ltd | Dartmouth | 2021 |
| Big Hope Centre CIC | London | 2025 |
| Big Ideas Box Limited | Walsall | 2023 |
| Big International College Ltd | London | 2025 |
| Big Kids Little Learners Ltd | Paisley | 2025 |
| Big Life Consulting Limited | Malvern | 2019 |
| Big Life Schools | Manchester | 2012 |
| Big Love Wellbeing CIC | Margate | 2026 |
| Big Love Youth Projects CIC | London | 2025 |
| Big M Promotions Ltd | Maidstone | 2025 |
| Big Mammas House CIC | Seafield | 2025 |
| Big Mouth Theatre Schools & Events Ltd | Southampton | 2022 |
| Big on Driver Training Ltd | Stoke-On-Trent | 2010 |
| Big Peeps Music Limited | London | 2025 |
| Big People Community CIC | Manchester | 2014 |
| Big Picture Education Ltd | Wellingborough | 2022 |
| Big Pink Bubble Limited | Knebworth | 2010 |
| Big Pink Collective CIC | Warrington | 2025 |
| Big Red BUS Club | London | 2012 |
| Big Red Climbing Ltd | Salisbury | 2023 |
| Big RIG Rugby Management Limited | Inverurie | 2025 |
| Big SIS C.I.C. | Saltash | 2020 |
| Big Sisters Academy CIC | St. Leonards-On-Sea | 2026 |
| Big Sky Inst Advancement Ltd | London | 2025 |
| Big Squid Diving Limited | Portland | 2008 |
| Big Swim Little Swim Limited | Ingatestone | 2023 |
| Big Teds Nursery Limited | Shoreham By Sea | 2010 |
| Big Tent Foundation | York | 2017 |
| Big Tent Ideas Festival Ltd | York | 2018 |
| Big Thinkers Ltd | Tonbridge | 2020 |
| Big Time Academy Limited | London | 2018 |
| Big Time Pre-Prep Limited | Harrow On The Hill | 2020 |
| Big Top Musical Adventures Community Interest Company | Stone | 2014 |
| Big Triangle Ltd | Tunbridge Wells | 2023 |
| Big Urban Grow Community CIC | London | 2026 |
| Big Voice - AIM High CIC | Liverpool | 2020 |
| Big Wheelers (South Wales) Limited | Llanishen | 2003 |
| Big Wheels Training (UK) Ltd | Wisbech | 2022 |
| Big Wild Life Limited | Walkerburn | 2020 |
| Big WIN Philanthropy | London | 2015 |
| BIG4 Global Learning Ltd | London | 2023 |
| Bigben UK Consultants Limited | Luton | 2012 |
| Bigcatz Martial Arts Club CIC | London | 2025 |
| Bigface Beers Limited | Harrogate | 2015 |
| Bigfoot Arts Education (South Wales) Ltd | Pontypridd | 2007 |
| Bigfoot Arts Education (UK) Ltd | Heanor | 2008 |
| Bigfoot Arts Education CIC | Heanor | 2024 |
| Bigfoot Arts South West Limited | Paignton | 2018 |
| Bigfoot International Education Ltd | Richmond | 2013 |
| Bigfootballer Ltd | London | 2018 |
| Bigg Driving School Ltd | Croydon | 2026 |
| Biggar Corn Exchange Ltd | Biggar | 2009 |
| Bigger Badder Better Ltd | Craigavon | 2026 |
| Bigger Picture Support Services Limited | Stafford | 2016 |
| Bigger Than US CIC | Harrow | 2025 |
| Biggerhouse Film CIC | Glastonbury | 2021 |
| Bignxt Ltd | London | 2025 |
| Bigstuff Enterprises Limited | Redditch | 2006 |
| Bigtalk Education Ltd | Gainsborough | 2017 |
| Biiab Qualifications Limited | Nottingham | 2016 |
| Bijou Day Nursery and Creche Ltd | Cowbridge | 2018 |
| Bijou Training Academy Ltd | Derby | 2021 |
| Bijou's Driving Instruction Ltd | Southampton | 2022 |
| Bijoy Youth Group-Byg Ltd | London | 2025 |
| Bike for Life (South) C.I.C. | Brighton | 2011 |
| Bike Futures Ltd | Otley | 2022 |
| Bike School Limited | Ashton-Under-Lyne | 2000 |
| Bike Skills Academy Limited | Solihull | 2022 |
| Bike Skills Ltd | Kidderminster | 2025 |
| Bike Stormz Nation Ltd | London | 2018 |
| Bike Works Community Interest Company | London | 2006 |
| Bike, Hike & Paddle Ltd | Carlisle | 2024 |
| Biker Girl Dog Trainer Ltd | Stockport | 2022 |
| Biker School Limited | Glasgow | 2019 |
| Bikeright! Limited | Woking | 2006 |
| Biketrainwales Limited | Margate | 2016 |