| Analytical Technology and Control Limited | Devizes | 1993 |
| Analytical Technology International Limited | Macclesfield | 2001 |
| Analytichem UK Ltd | Bicester | 1974 |
| Analyze IT Security Services Ltd | London | 2020 |
| Anam Agro Commodities Limited | Ilford | 2022 |
| Anam Verde Ltd | London | 2022 |
| Anamaria Tailoring Design & Fashion Ltd | Aberdeen | 2020 |
| Anamaxx Ltd | Cambridge | 2026 |
| Anamme Limited | Glasgow | 2020 |
| Ananas Anam UK Limited | London | 2013 |
| Anand Foods Limited | Leeds | 2015 |
| Anandas Gourmet Ltd | Yarm | 2013 |
| Ananta Ayurveda Ltd | Slough | 2023 |
| Ananta Eluxe Ltd | Slough | 2025 |
| Anantaa Aviation Limited | Feltham | 2024 |
| Ananya Fine Jewellery Limited | London | 2024 |
| Anaphite Limited | Bristol | 2016 |
| Anapos Ltd | Wigan | 2017 |
| Anar Kitchen Ltd | Birmingham | 2026 |
| Anarchy Beers Ltd | Ponteland | 2024 |
| Anarchy Brew Co. Limited | Houghton Le Spring | 2011 |
| Anarchy Film Services Ltd | London | 2017 |
| Anari Juice Ltd | Greenford | 2026 |
| Anarkali Fabrics M/C Ltd | Burnley | 2016 |
| Anas Asmat Ltd | Leicester | 2024 |
| Anasa London Limited | High Wycombe | 2025 |
| Anasands Ltd | Banstead | 2025 |
| Anastasia Clothing Ltd | London | 2025 |
| Anastasia Motorsport Ltd | London | 2026 |
| Anastasia's Pantry Ltd | Orpington | 2021 |
| Anasyst Ltd | Middlesbrough | 2013 |
| Anat and Nicole Limited | London | 2006 |
| Anatoa Ltd | Richmond | 2026 |
| Anatolia Consultancy and Accountancy Ltd | London | 2021 |
| Anatolia Tailor Textile Ltd | London | 2021 |
| Anatolian Cuisine Handmade Ltd | Manchester | 2022 |
| Anatomica 3D Limited | Hampstead, London | 2023 |
| Anatromics Ltd | Brampton | 2018 |
| Anaut UK Ltd | Farnborough | 2026 |
| Anaxi Technologies Ltd | London | 2023 |
| Anaxor Ltd | Barnet | 2025 |
| Anayah Cosmetics Ltd | London | 2025 |
| Anayra Ltd | London | 2024 |
| Anba 8 LYN Long Limited | London | 2015 |
| Anbaro Ltd | London | 2025 |
| Anbison LAB. UK Ltd | Huddersfield | 2020 |
| Anbolife Group Co., Ltd. | London | 2020 |
| ANC Computers Limited | Leeds | 2025 |
| ANC Machinery Ltd | Thetford | 2021 |
| Anca (U.K.) Limited | Coventry | 1986 |
| Anca Workforce Solutions Ltd | Plymouth | 2022 |
| Ancarvalde Aluminium Limited | Derby | 2025 |
| Ancasta Topco Limited | Hamble | 2014 |
| Ancasta Yacht Services Limited | Hamble | 1961 |
| Ancaster Plant Ltd | Newry | 2024 |
| Ancat Limited | Nottingham | 1993 |
| Ancestors of Dover Limited | Carlisle | 1992 |
| Ancestra Nutrition Ltd | Poole | 2023 |
| Ancestral Skin Limited | Skelmersdale | 2025 |
| Ancestral Superfoods UK Ltd | Stratford-Upon-Avon | 2021 |
| Anchor (B'Ham) Limited | Birmingham | 2003 |
| Anchor Automatic Door Systems Ltd | London | 2026 |
| Anchor Bay Heritage Ltd | Dartford | 2024 |
| Anchor by Chiefer Limited | London | 2026 |
| Anchor Energy Resources & Logistics Company Ltd | Croydon | 2025 |
| Anchor Engineering (Bolton) Limited | Bolton | 1981 |
| Anchor Export Services Limited | Saltaire | 1986 |
| Anchor Group Limited | Sheffield | 2013 |
| Anchor Holdings Group Limited | Sheffield | 2024 |
| Anchor Inserts Limited | Coventry | 2005 |
| Anchor Labs London Ltd | Cardiff | 2017 |
| Anchor Lane Builders Ltd | Dundee | 2018 |
| Anchor Manufacturing Limited | Sheffield | 1999 |
| Anchor Marine Plastics Limited | Chobham | 1978 |
| Anchor Point Fabrication Limited | Exeter | 2025 |
| Anchor Point GRP Limited | Exeter | 2025 |
| Anchor Reserve Limited | Sheffield | 2025 |
| Anchor Security Systems Ltd | Lichfield | 2023 |
| Anchor Systems (International) Limited | Lingfield | 2000 |
| Anchor Windows (Ebbw Vale) Ltd | Ebbw Vale | 2000 |
| Anchorbloc Limited | Retford | 2009 |
| Anchoright Ltd | Bournemouth | 2022 |
| ANCHORMAN10 Limited | London | 2025 |
| Anchormind AI Ltd | Kington | 2025 |
| Anchorpoint Systems Ltd | London | 2025 |
| Anchorprint Ltd | Leicester | 1989 |
| Anchortag Ltd | Woking | 2025 |
| Anchortec Limited | Chesterfield | 2001 |
| Anciela Ltd | London | 2019 |
| Ancient & Modern Builders Ltd | Lymington | 2024 |
| Ancient Aviation Limited | Reading | 2020 |
| Ancient Extracts Ltd | Thetford | 2023 |
| Ancient Foods Limited | Bolton | 2023 |
| Ancient Greek Furniture Co. Limited | London | 2015 |
| Ancient House Press Ltd | London | 1946 |
| Ancient House Printing Group Limited | Ipswich | 1971 |
| Ancient Machine Ltd | London | 2020 |
| Ancient Materials Ltd | Alresford | 2015 |
| Ancient Others Interactive Limited | Cardiff | 2020 |
| Ancient River Electric Company Limited | Beckenham | 2023 |