| LTi Metaltech Ltd | Oxfordshire | A rating |
| LTI TECHNOLOGY SOLUTIONS LIMITED | Reading | A rating |
| LTK Whitby LTD | Whitby | A rating |
| LTM UK & IRELAND LIMITED | London | A rating |
| LTS Advisory Limited | London | A rating |
| LTS COMMERICAL SERVICES LIMITED | Queensborough | A rating |
| LTS Investments UK Ltd | London | A rating |
| LTV AUTOCENTER LIMITED | Peterborough | A rating |
| LTV Capital | London | A rating |
| Lu Oliphant Solicitors LLP | London | A rating |
| Luan electrical contractors ltd | Uxbridge | A rating |
| Luanelle Limited t/a Blossom Home Care Tunbridge Wells | Kent | A rating |
| LUBA CARE CYF T/A BALMORAL HOUSE | NEWPORT | A rating |
| Luba Jones Ltd | London | A rating |
| Luban Homes Limited | London | A rating |
| Lubbock Fine | London | A rating |
| Lubbock Fine LLP | London | A rating |
| Lubkowski Saunders and Associates Limited | Sunbury on Thames | A rating |
| LUBNA & ALI COMPANY LIMITED | London | A rating |
| Lubna Awan Properties Limited | Manchester | A rating |
| LUBNA FOODS LIMITED | Bradford | A rating |
| Lubrikem Limited | London | A rating |
| Lubrizol Limited | Derby | A rating |
| Lubron Uk Ltd | COLCHESTER | A rating |
| Lubz Telecom Ltd | Reading | A rating |
| LUC Group Limited | Derbyshire | A rating |
| LUCA PACIOLI BUSINESS SOLUTIONS LTD | Welwyn Garden City | A rating |
| LucaNet (UK) Limited | London | A rating |
| Lucart Hygiene Limited | Worcestershire | A rating |
| Lucas Systems Limited | Bracknell | A rating |
| Lucat Ltd | London | A rating |
| LUCATONI LIMITED t/a Four Seasons | Wishaw | A rating |
| Lucchini Unipart Rail Limited | Manchester | A rating |
| Luceco Plc | Telford | A rating |
| LUCENT LIGHTING LTD | LONDON | A rating |
| Lucerna Business Ltd | London | A rating |
| Lucerna Wealth Management | London | A rating |
| LUCHFORD APM Ltd | London | A rating |
| Luchi Healthcare Limited | Walthamstoe | A rating |
| LUCIA'S KINGDOM LIMITED t/s Wafflemeister | Brighton | A rating |
| Luciano Bar and Bistro | Peterlee | A rating |
| Luciano Giubbilei Limited | London | A rating |
| Luciano's at the Millstone | Adlington | A rating |
| Lucid Creative Works Limited | Crowborough | A rating |
| Lucid Games Ltd | Liverpool | A rating |
| Lucid Motors Limited | Warwick | A rating |
| Lucid Partners Ltd | London | A rating |
| Lucideon Limited | Stone | A rating |
| Lucidica Ltd | London | A rating |
| Lucidity London Limited | Slough | A rating |
| Lucidlog Ltd | London | A rating |
| Lucidworks UK Ltd | Reading | A rating |
| Lucilla Schoolwear Ltd | Ilford | A rating |
| Lucion Services | Gateshead | A rating |
| Lucketts Care Agency | Canterbury | A rating |
| Lucketts of Watford Limited | Watford | A rating |
| LUCKIES GROUP LIMITED | London | A rating |
| Lucking & Clark Consulting Engineers Ltd | London | A rating |
| luckman limited | Leicester | A rating |
| Luckman stores ltd t/a Pepes Piri Piri | Leicester | A rating |
| Luckmans Duckett Parker Limited | Coventry Business Park | A rating |
| Lucknow Borough Ltd | London | A rating |
| LUCKNOW HOUSE LTD T/A NISA LOCAL | Greenhithe | A rating |
| Lucknow Junction | Manchester | A rating |
| Lucks Yard Clinic | Godalming | A rating |
| Luckshmee Ltd | Wembley | A rating |
| Luckxy Transport Private Ltd | Wolverhampton | A rating |
| LUCKY 7 STARS LTD | Sutton Coldfield | A rating |
| Lucky Beach Ltd | Brighton | A rating |
| Lucky Beans Childcare Limited | Tooting | A rating |
| Lucky Bubble Shepherd's Bush Ltd | London | A rating |
| Lucky Builders Ltd | Willenhall | A rating |
| LUCKY BUILDING SERVICES LTD | Camberley | A rating |
| Lucky Cat Post Production | London | A rating |
| Lucky Cat Publishing Ltd trading as Magic Cat Publishing | London | A rating |
| Lucky Dale Cars Ltd | Croydon | A rating |
| LUCKY DAN LIMITED | London | A rating |
| Lucky Egg Limited | London | A rating |
| Lucky Foods (UK) Ltd | Charlton | A rating |
| LUCKY FOUNTAIN LIMITED T/A THE NEW FOUNTAIN GARDEN | Surrey | A rating |
| Lucky furniture and carpets limited | Luton | A rating |
| Lucky Innotech Solutions Limited | Watford | A rating |
| LUCKY KOREA LIMITED | London | A rating |
| LUCKY LOUNGE LTD | Coventry | A rating |
| LUCKY MAMA LTD | Manchester | A rating |
| LUCKY MOTORS SERVICES LTD | Wigston | A rating |
| Lucky News | Maidstone | A rating |
| Lucky Number 3 Ltd | Blackpool, Lancashire | A rating |
| Lucky Red 936 Ltd T/A Rain Flower | Crook | A rating |
| LUCKY RETAILS UK LIMITED T/A MIABELLA | London | A rating |
| LUCKY SCHOOL UNIFORM LTD | MANCHESTER | A rating |
| Lucky Seven PVT Ltd | Saltash | A rating |
| Lucky Sky Limited | Hemel Hempstead | A rating |
| LUCKY STAR FISH & CHIPS LTD | BURY ST EDMUNDS | A rating |
| LUCKY SUNG SING LIMITED | Haddington | A rating |
| LUCKY SUPERMARKET | LEICESTER | A rating |
| Lucky168 Ltd T/A Fortune Inn Chinese Restaurant | Taunton | A rating |
| Lucky7 Ventures Limited | London | A rating |
| Luckybubble Limited | HARROW | A rating |
| LUCKYTEA CT LTD | London | A rating |
| Luckytea limited | Borehamwood | A rating |
| Lucozade Ribena Suntory Limited t/as Suntory Beverage & Food Great Britain and Ireland | Uxbridge | A rating |
| LUCRATIVE BUSINESS SOLUTIONS LTD | London | A rating |
| LUCREZIO LIMITED | BEDFORD | A rating |
| LUCS BRASSERIE LIMITED | London | A rating |
| Lucton School | Leominster | A rating |
| Lucy A Raymond & Sons Limited | London | A rating |
| Lucy and Phil Limited | Slough | A rating |
| Lucy Cavendish College | Cambridge | A rating |
| Lucy Electric (EMS) Ltd | Oxford | A rating |
| Lucy Watson Productions | Lambourn | A rating |
| Ludan Group Ltd | Hyde | A rating |
| Luddon Construction Limited | Glasgow | A rating |
| Ludgate Investments Ltd | London | A rating |
| Ludger Ltd | Abingdon | A rating |
| Ludgrove School Trust LTD | Wokingham | A rating |
| Ludlow Bookbinders Ltd | Ludlow | A rating |
| Ludlow Cricket Club | Ludlow | A rating |
| Ludlowthompson | Worcester | A rating |
| Ludonautics Limited | Gloucester | A rating |
| Ludwick Precision | Hitchin | A rating |
| Luftavia LTD | Stanwell Moor | A rating |
| Lufthansa German Airlines & Lufthansa Cargo | Hounslow | A rating |
| LUFTHANSA TECHNIK LANDING GEAR SERVICES UK LIMITED | Hayes | A rating |
| LUGANA LTD | Beckenham | A rating |
| LUH COFFEE LTD | Ashford | A rating |
| Luhrfilter Ltd | Burntwood | A rating |
| LUI FOODS LIMITED | Hornchurch | A rating |
| Luigi's Alfresco Limited t/a Luigi's Al Fresco at the Griffin | Chelmsford | A rating |
| LUK Hospitalities Limited | Birmingham | A rating |
| Lukas Jewellery Limited | Wembley | A rating |
| Luke Roper Limited | Bicester | A rating |
| Luke Wade Electrical | London | A rating |
| LUKEYS SPORTS LIMITED | Preston | A rating |
| Lukka Care Homes (2010) Limited t/a Ashton Lodge Care Home | London | A rating |
| LUKKA CREATIVE LTD | London | A rating |
| LULI UK FESTIVAL | OLDHAM | A rating |
| Lullington Park Cricket Club | Swadlincote | A rating |
| Lulu Hair and Beauty Limited | Welling | A rating |
| Lulu Traders Limited | London | A rating |
| Lulu's Bakeshop LTD | Northfleet | A rating |
| Lululemon Athletica UK Ltd. | London | A rating |
| LUMA HOMECARE LTD | Birmingham | A rating |
| Lumai Limited | Oxford | A rating |
| LUMAK SERVICES LIMITED | WOLVERHAMPTON | A rating |
| Lumanity Limited | London | A rating |
| LUMAUK LIMITED | BOURNEMOUTH | A rating |
| Lumbini Grocery Ltd | London | A rating |
| Lumbini Store UK Ltd | Aldershot | A rating |
| LUMEN ELECTRONICS | TOOMEBRIDGE | A rating |
| Lumen Learning Trust | Shepperton | A rating |
| Lumen Research Ltd | London | A rating |
| Lumen Specialty Limited | London | A rating |
| Lumene Limited | London | A rating |
| Lumenis BE UK Ltd | High Wycombe | A rating |
| Lumentum Technology UK Limited | Towcester | A rating |
| Lumeon Ltd | London | A rating |
| Lumera Limited | London | A rating |
| Lumex Consulting (UK) Ltd | Brighton | A rating |
| Lumi AGM UK Limited | Liphook, | A rating |
| Lumico Digital Limited | Lee-on-the-Solent | A rating |
| LUMIDENT LTD | Caerphilly | A rating |
| Lumiere consultancy | Surrey | A rating |
| Lumiere London Ltd | London | A rating |
| Lumilinks Group | Farnborough | A rating |
| Lumin Wealth Limited | St Albans | A rating |
| LUMINA BUSINESS CONSULTANCY LTD | LONDON | A rating |
| Lumina Innovations Limited | London | A rating |
| Lumina Learning Limited | Reading | A rating |
| Lumina Video Ltd | London | A rating |
| Luminaire Limited | London | A rating |
| Luminal UK | London | A rating |
| Luminance Technologies Ltd | London | A rating |
| Luminary Bakery Ltd | London | A rating |
| Luminary ROLI Ltd. | London | A rating |
| Luminate Education Group | Leeds | A rating |
| LUMINATE UK SERVICES LIMITED | London | A rating |
| Luminco UK Limited | Brentwood | A rating |
| Lumine Law Ltd | London | A rating |
| Luminer Home Ltd | Sale | A rating |
| Luminet Solutions Ltd | Islington | A rating |
| Luminii UK | London | A rating |
| Luminite Electronics Ltd, | London | A rating |
| Luminos Fund (UK) | London | A rating |
| LUMINOUS DOMICILIARY CARE LTD | Norwich | A rating |
| Luminous Energy Ltd | Corsham | A rating |
| Luminous Garage Limited | Bolton | A rating |
| LUMIO TECHNOLOGIES LTD | Clevedon | A rating |
| LUMIPEARL CONSULTANCY LTD | London | A rating |
| LumiraDX UK Ltd | London | A rating |
| Lumirithmic Limited | Wimborne | A rating |
| Lumis Student Living Limited | London | A rating |
| LUMITEL LIMITED | NORTHFLEET | A rating |
| Lumivero UK Limited | London | A rating |
| LUMLE HOLIDAYS LTD. | Slough | A rating |
| LUMMUS CONSULTANTS INTERNATIONAL LT | MILTON KEYNES | A rating |
| Lumon Pay Ltd | London | A rating |
| LUMORA LIMITED | Ely | A rating |
| Lumos Foundation | London | A rating |
| LUMOS MEDIA LTD | London | A rating |