| Kong Scaffolding Ltd | Construction | 2019 |
| Koningsblue Consultancy Ltd | Professional & scientific | 2018 |
| Konnekt Building Services Ltd | Construction | 2026 |
| Konnekt Electrical Ltd | Manufacturing | 2023 |
| Koolmill Limited | Other services | 2011 |
| Koolmill Systems Limited | Manufacturing | 1988 |
| Kopano Professional Services Ltd | Other services | 2018 |
| KOS Property Management Limited | Real estate | 2023 |
| Kovac Services Ltd | Wholesale & retail | 2019 |
| Kovic Design Limited | Professional & scientific | 2009 |
| Kpea (UK) Ltd | Administrative & support | 2006 |
| KPK Mobiles Ltd | Wholesale & retail | 2022 |
| Kpmz Consulting Limited | Construction | 2024 |
| KPR Infinity Health Ltd | Health & social care | 2023 |
| KPS Real Estate Ltd | Real estate | 2019 |
| KR Design Limited | Professional & scientific | 2022 |
| KR Medical Ltd | Health & social care | 2021 |
| Kramah Stanch Ltd | Information & communication | 2015 |
| KRB Holdings Ltd | Information & communication | 2023 |
| KRE8 Developments Ltd | Construction | 2016 |
| Kreative IT Enabled Solutions Limited | Information & communication | 2017 |
| Krest Store Ltd | Wholesale & retail | 2026 |
| Krishiv Developments Ltd | Professional & scientific | 2014 |
| Kristem Consulting Limited | Professional & scientific | 2008 |
| Kristian Paris Ltd | Wholesale & retail | 2023 |
| Kriti Solutions Ltd | Other services | 2017 |
| KRM Brand House Ltd | Wholesale & retail | 2026 |
| KRO Consultants Ltd | Information & communication | 2013 |
| Krrb Investments Limited | Real estate | 2025 |
| KRS Heating Ltd | Construction | 2018 |
| KRS Profitti Limited | Professional & scientific | 2011 |
| Krundil Developments Ltd | Construction | 2015 |
| KS Kane Consulting Limited | Professional & scientific | 2019 |
| Ksami Properties Ltd | Real estate | 2026 |
| Ksas Global Store Ltd | Wholesale & retail | 2026 |
| KSB (Group) Investments Limited | Real estate | 2020 |
| KSB Catering & Hospitality Recruitment Limited | Administrative & support | 2017 |
| KSB Recruitment Consultants Limited | Administrative & support | 2002 |
| Ksicm Ltd | Professional & scientific | 2018 |
| KSN Design Ltd | Professional & scientific | 2018 |
| Ksol Ltd | Education | 2023 |
| Ksuye Consultancy Ltd | Professional & scientific | 2022 |
| KSV Electrical Services Ltd | Construction | 2022 |
| KSV Solutions Ltd | Information & communication | 2020 |
| KT Fluid Power Supplies Limited | Administrative & support | 2008 |
| KT Tennis Ltd | Education | 2024 |
| KT Training Solutions Limited | Administrative & support | 2010 |
| KTL Health & Safety Ltd | Administrative & support | 2015 |
| KTS Developments Ltd | Real estate | 2022 |
| KTW Limited | Professional & scientific | 2022 |
| Kudos Consultancy Group Limited | Professional & scientific | 2014 |
| Kudos Properties Limited | Real estate | 2019 |
| Kudos Properties(Holdings) Ltd | Real estate | 2015 |
| Kudosmade(Holdings) Ltd | Real estate | 2021 |
| Kunokine Limited | Other services | 2023 |
| Kupenya Holdings Ltd | Financial services | 2023 |
| Kurda Property Ltd | Real estate | 2018 |
| KVD Limited | Wholesale & retail | 1993 |
| Kvfitness, Sports Massage/ Therapy Clinic Ltd | Health & social care | 2025 |
| Kxptrading Limited | Wholesale & retail | 2017 |
| Kynton Ltd | Professional & scientific | 2024 |
| Kyrios.Ai Ltd | Professional & scientific | 2024 |
| Kütchenhaus Solihull Limited | Manufacturing | 2023 |
| L & a Properties Limited | Real estate | 2008 |
| L & M Parnaby Limited | Administrative & support | 2012 |
| L 7 Lorry Loaders Ltd | Professional & scientific | 2023 |
| L a Pipelines Limited | Construction | 2010 |
| L C Consulting PR Limited | Professional & scientific | 2025 |
| L Cooper Consultancy Limited | Professional & scientific | 2025 |
| L H Creative Music Ltd | Arts & recreation | 2025 |
| L H G Tunnelling Limited | Construction | 2025 |
| L J Cross Ltd | Information & communication | 2024 |
| L J Estates Limited | Administrative & support | 2022 |
| L O'Shea Engineering Ltd | Construction | 2023 |
| L&A Landscape Limited | Administrative & support | 2026 |
| L&C Elite Property Ltd | Real estate | 2020 |
| L&C Enterprises Tamworth Limited | Other services | 2023 |
| L&L Group Limited | Financial services | 2021 |
| L&L Products Europe Limited | Administrative & support | 2002 |
| L17 Holdings Limited | Financial services | 2023 |
| L4 Real Enterprises Limited | Real estate | 2010 |
| L4 Solutions Ltd | Administrative & support | 2025 |
| LA Lune Interors Limited | Professional & scientific | 2024 |
| LA Maison DU Gourmet Limited | Hospitality | 2008 |
| LA Shish Sleaford Limited | Hospitality | 2021 |
| La'Niz Cafe' Ltd | Hospitality | 2024 |
| Labforge Ltd | Information & communication | 2015 |
| Laboratory Management Services Ltd | Health & social care | 2020 |
| Labotek GB Limited | Wholesale & retail | 2006 |
| Labour of Love Hypnobirthing Limited | Other services | 2019 |
| Ladana Lounge Ltd | Hospitality | 2019 |
| Ladana Ltd | Hospitality | 2019 |
| Ladbrook Hall Estates Ltd | Hospitality | 2024 |
| Ladywood Garage Limited | Wholesale & retail | 1955 |
| Lagoon Beauty Limited | Extraterritorial | 2007 |
| Lake View Management Company Ltd | Real estate | 2020 |
| Lakes Bathrooms PEO Limited | Administrative & support | 2025 |
| Lakes Safeguarding Consultancy Limited | Professional & scientific | 2013 |
| Lakeside Financial Services Limited | Financial services | 2014 |
| Lakeside Management (Selly Park) Limited | Households | 1985 |