| Blue Hairdressing Ltd | Other services | 2006 |
| Blue Heaven Bar & Grill Ltd | Hospitality | 2026 |
| Blue Hill Landscape Design Ltd | Professional & scientific | 2022 |
| Blue Lion Analytics Limited | Information & communication | 2017 |
| Blue Monkey Analytics Limited | Professional & scientific | 2007 |
| Blue Olivine Ltd | Manufacturing | 2025 |
| Blue Pebble Holidays Ltd | Real estate | 2019 |
| Blue Ridge Performance Management Ltd | Administrative & support | 2010 |
| Blue Sky Acoustics Ltd | Professional & scientific | 2013 |
| Blue Sky Day Nursery Limited | Health & social care | 2004 |
| Blue Sky Developments (Yorkshire) Limited | Real estate | 2007 |
| Blue Sky KTV Ltd | Information & communication | 2025 |
| Blue Sky Marketing Limited | Wholesale & retail | 2015 |
| Blue Torso Ltd | Information & communication | 2021 |
| Blue Tree Holdings Ltd | Wholesale & retail | 2022 |
| Blue Zebra Ltd | Health & social care | 2022 |
| Bluebell Barn Holidays Limited | Hospitality | 2003 |
| Bluebell Grange Residents Management Company Limited | Households | 2024 |
| Bluebell Meadow (Bradwell) Management Company Limited | Households | 2014 |
| Blueberry Inn Limited | Information & communication | 2024 |
| Bluebird Bakery Ltd | Manufacturing | 2015 |
| Bluebridge York Management Company Limited | Real estate | 2015 |
| Blueman Great Refurbs Limited | Construction | 2012 |
| Blues Catering Ltd | Hospitality | 2023 |
| Bluewater Bathrooms Limited | Construction | 2012 |
| Blufield Ltd | Other services | 2015 |
| Bluwater Solutions Limited | Wholesale & retail | 2020 |
| BM (York) Limited | Transport & logistics | 1965 |
| BMG Accountants Ltd | Financial services | 2023 |
| BMM Family Limited | Professional & scientific | 2021 |
| Bmma Kent Ltd | Arts & recreation | 2025 |
| Bmodular Limited | Construction | 2021 |
| BMS Property Solutions Limited | Administrative & support | 2018 |
| BNT Stores Ltd | Wholesale & retail | 2019 |
| Bnzet Limited | Information & communication | 2019 |
| Boanas Ltd | Professional & scientific | 2021 |
| Board and Chisel Ltd | Construction | 2026 |
| Boarding Bites Limited | Wholesale & retail | 2019 |
| BOB Clubs Yorkshire Ltd | Other services | 2018 |
| BOB Doyle Transport Solutions Limited | Construction | 2017 |
| BOB Trotter Cycles Limited | Wholesale & retail | 2001 |
| Bobby Land Limited | Construction | 2015 |
| Bobby Leisure Ltd | Hospitality | 2023 |
| Bobsleigh Inn Limited | Hospitality | 2006 |
| Bodo Production Ltd | Extraterritorial | 2022 |
| Bodrum (York) Limited | Hospitality | 2019 |
| Body Transformation Mastery Ltd | Arts & recreation | 2024 |
| Bodyfix Transformation Centre Ltd | Arts & recreation | 2018 |
| Bodymastermind Limited | Information & communication | 2012 |
| Boffy’S Play Cafe Ltd | Hospitality | 2025 |
| Boiler and Engineering Skills Training Trust | Professional & scientific | 2006 |
| Bojkolaboratory Ltd | Information & communication | 2023 |
| Boksburg Consulting Limited | Information & communication | 2025 |
| Bolam Developments Limited | Construction | 2019 |
| Bolero Association Limited | Administrative & support | 1995 |
| Bolshee CIC | Arts & recreation | 2022 |
| Bolt-On (York) Ltd | Construction | 2026 |
| Boltero Limited | Wholesale & retail | 2021 |
| Bolthole Properties of York Ltd | Hospitality | 2023 |
| Bolton Crofts Limited | Real estate | 2014 |
| Bolton Residential Ltd | Real estate | 2023 |
| Bolton Transport&Logistics Ltd | Transport & logistics | 2020 |
| BON BON Bean Limited | Education | 2022 |
| Bond & Family Properties Ltd | Real estate | 2026 |
| Bond Thoroughbred Limited | Agriculture & fishing | 2019 |
| Bondgate Consulting Ltd | Professional & scientific | 2005 |
| Bonjewel Elegance Collection Limited | Wholesale & retail | 2024 |
| Bonne Idée Media Limited | Information & communication | 2025 |
| Bonner Group Limited | Financial services | 2017 |
| Bonner Rail Limited | Professional & scientific | 2013 |
| Bonni Fashions Yorkshire Ltd | Manufacturing | 2023 |
| Bonobo Films Ltd | Information & communication | 2024 |
| Bonum IP Limited | Professional & scientific | 2022 |
| Bonveda Limited | Professional & scientific | 2024 |
| BOO Boo's Day Nursery Limited | Health & social care | 2014 |
| BOO Property Limited | Real estate | 2020 |
| Book My Caravan Ltd | Wholesale & retail | 2022 |
| Book With Boorman Ltd | Real estate | 2025 |
| Bookkeeping Services Limited | Professional & scientific | 2005 |
| Bookmechanic.Uk Ltd | Information & communication | 2025 |
| Books and Bevs Ltd | Wholesale & retail | 2025 |
| Boon & Moil Limited | Information & communication | 2019 |
| Boon Investments Ltd | Financial services | 2021 |
| Boon RUK SA Thai Therapy Limited | Other services | 2021 |
| Boost Consultancy Ltd | Hospitality | 2020 |
| Boot Strapped Trading Limited | Wholesale & retail | 2018 |
| Bootham Apartments Management Company Limited | Households | 2004 |
| Bootham Architects Limited | Professional & scientific | 2011 |
| Bootham Consulting Limited | Information & communication | 2016 |
| Bootham Crescent (York) Residents Management Company Limited | Real estate | 2022 |
| Bootham Crescent Holdings Limited | Administrative & support | 1998 |
| Bootham Crescent Management Company Limited | Households | 1993 |
| Bootham Developments (York) Ltd | Construction | 2022 |
| Bootham Developments LLP | | 2014 |
| Bootham Green (York) Management Company Limited | Households | 2013 |
| Bootham House Management Company Limited | Households | 2020 |
| Bootham Network Solutions Limited | Professional & scientific | 2016 |
| Bootham Pensions and Investments Limited | Financial services | 2017 |
| Bootham Property Limited | Real estate | 2014 |
| Bootham Removals & Storage Limited | Transport & logistics | 2003 |