| LWS CONSULTANCY LTD | London | A rating |
| LWT Health Care Limited T/A Streatfeild House | St.Leonard on sea | A rating |
| LX Hausys Europe GMBH | West Malling | A rating |
| LX Pantos U.K. Limited | Lutterworth | A rating |
| LXS Consultancy | London | A rating |
| LXS IN UK LTD | London | A rating |
| LY Capital Ltd | Birmingham | A rating |
| Lyca Health Canary Wharf Ltd | London | A rating |
| Lycamobile UK Ltd | London | A rating |
| LYCEE FRANCAIS CHARLES DE GAULLE | LONDON | A rating |
| Lycee International de Londres | Wembley | A rating |
| Lycette Care | Northam | A rating |
| Lychee Foods Ltd | Winchester | A rating |
| Lychgate House Care Limited | Colchester | A rating |
| Lyco Group Limited | Guildford | A rating |
| Lycosa Web Services Ltd | Driffield | A rating |
| LYDIA CAPITAL MANAGEMENT LIMITED | London | A rating |
| Lydia Digital Ltd | London | A rating |
| LYE AUTOS LTD | Stourbridge | A rating |
| LYE LARUE LTD | London | A rating |
| LYFE TECHNOLOGY LIMITED | Bristol | A rating |
| LYFPLAN LIMITED | London | A rating |
| Lyfta Education Limited | Warwick | A rating |
| LYH Limited | London | A rating |
| LYKIAFASHION LIMITED | LONDON | A rating |
| Lykos Academy Trust | Wolverhampton | A rating |
| LYKRIS INNOVATION GLOBAL LTD | Clydebank | A rating |
| Lyle & Scott ltd. | London | A rating |
| Lyma Life limited | London | A rating |
| Lyme Regis Bespoke Interiors Ltd | Axminster | A rating |
| Lyme Regis Care Home Limited | Lyme Regis | A rating |
| LYMINGE FOOD & WINE | FOLKESTONE | A rating |
| LYMINGTON SUSHI LTD | Poole | A rating |
| Lymington Visionplus Ltd | Lymington | A rating |
| LYMM LIMITED | LYMM | A rating |
| Lympne Castle Management Limited | Lympne | A rating |
| Lympstone Manor Hotel | Exmouth | A rating |
| Lyn Michel LTD | London | A rating |
| Lynas Foodservice | Coleraine | A rating |
| Lyncage Professional Services | Sheffield | A rating |
| Lynch Architects | London | A rating |
| Lynch Hill School Primary Academy | Slough | A rating |
| Lynch4 Care Services Limited t/a Right at Home Medway | Gillingham | A rating |
| Lynchpin Analytics Ltd | Edinburgh | A rating |
| LYNDALE CARE HOME LIMITED | SOUTHPORT | A rating |
| Lyndell House Nursing Home | Swansea | A rating |
| Lynden Hill Clinic | Reading | A rating |
| LYNDHURST CARE LTD | Middleton, Manchester, | A rating |
| Lyndhurst Dental Practice Ltd | Hastings | A rating |
| Lyndhurst Limited | Liverpool | A rating |
| Lyndhurst Park Nursing & Residential Care Home | Weston Super Mare | A rating |
| Lyndhurst Rest Home | Whitstable | A rating |
| Lyndon Goode Architects Ltd | London | A rating |
| LYNEDOCH CARE LIMITED | Edinburgh | A rating |
| Lyngbakr Limited | Southwold | A rating |
| Lyngold Ltd T/A Sinclairs Pharmacy | London | A rating |
| Lynn Care Service Limited | Enfield | A rating |
| Lynn Macbain | Harrogate | A rating |
| Lynn Shellfish | Kings Lynn | A rating |
| Lynns Country Foods Limited | Downpatrick | A rating |
| Lynott Partners Ltd | London | A rating |
| LYNQ LIMITED | FAREHAM | A rating |
| Lynton Charles Limited | Weymouth | A rating |
| Lynton Lasers Limited | Holmes Chapel | A rating |
| LYNWOOD (LONDON) PROJECT MANAGEMENT LTD | Bath | A rating |
| Lynwood Healthcare Ltd | Kilingworth | A rating |
| LYNWOOD MEDICAL CENTRE | Romford | A rating |
| LYNX DRY CLEANIGN SUPPLIES LTD | hainault | A rating |
| Lyon & Lyon Creative Ltd | Sheffield | A rating |
| Lyon and Turnbull | Edinburgh | A rating |
| Lyondale Ltd | London | A rating |
| LyondellBasell Industries NV | Lonon | A rating |
| Lyons & Annoot Limited | Ramsgate | A rating |
| Lyons Bowe | Shepton Mallet | A rating |
| Lyons Business Service Ltd (TA Mail boxes) | London | A rating |
| Lyons Holiday Parks Ltd | Rhyl | A rating |
| LYONS ONEILL LIMITED | LONDON | A rating |
| Lyons Seafood Ltd | Warminster | A rating |
| Lyons+Sleeman+Hoare Limited | Hartley Wintney | A rating |
| LYRA 15 LIMITED | LEICESTER | A rating |
| Lyra Health International Limited | London | A rating |
| Lyra International Tech Limited | London | A rating |
| Lyric Hotels Ltd T/A Ringwood Hall Hotel & Spa | Sutton Coldfield | A rating |
| Lyric Theatre Hammersmith Limited | London | A rating |
| Lyricfind UK Ltd | London | A rating |
| LYSANDER ASSOCIATES LIMITED | GODALMING | A rating |
| Lysander Shipping Ltd | Liverpool | A rating |
| Lysis Financial Limited | London | A rating |
| Lyst Ltd | London | A rating |
| Lyte Charging Ltd | Bolton | A rating |
| Lytham Cricket and Sports Club | Blackpool | A rating |
| Lytham Road Surgery | Preston | A rating |
| Lytham St Annes Primary Care Network Limited | Lytham St Annes | A rating |
| Lyttle IT Limited | Swindon | A rating |
| Lyx Logistics Ltd | Halifax | A rating |
| LZZ Foods Ltd | Welling | A rating |