| Zoot Enterprises Limited | Leeds | A rating |
| Zooves Ltd | Reading | A rating |
| Zoox Labs Ltd | Banbury | A rating |
| ZOOZEE TRADING LTD | East Kilbride | A rating |
| Zopa Bank Limited | London | A rating |
| Zora Haulage Ltd | Wraysbury | A rating |
| Zoran's Delicatessen Limited | Twickenham | A rating |
| Zorba Delicacies Limited | Ebbw Vale | A rating |
| Zorba Group Limited | Kent | A rating |
| ZORBA TAKEAWAY | HASLINGDEN | A rating |
| ZORBAS READING LTD | Winnersh | A rating |
| Zorca Hospitality Ltd | London | A rating |
| Zosh Ltd t/a Blossom Home Care | Ayr | A rating |
| ZOSH OCCUPATIONAL HEALTH LIMITED | Lancaster | A rating |
| Zot Engineering | MUSSELBURGH | A rating |
| ZOT LTD | London | A rating |
| Zotefoams PLC | Croydon | A rating |
| Zouba Travel Limited | Edinburgh | A rating |
| Zouk Restaurant Services Ltd t/a Zouk Tea Bar and Grill | Manchester | A rating |
| Zouk Ventures Limited | London | A rating |
| Zoya Afro Caribbean Food LTD | COVENTRY | A rating |
| ZOYA FOODS PRIVATE LTD | Worthing | A rating |
| ZOZAZA LLC LLP | Birmingham | A rating |
| ZOZO DMC LTD | Manchester | A rating |
| Zozo DMC Ltd. | Balloch | A rating |
| ZOZO U.K. LIMITED | London | A rating |
| ZP GROUP LTD | Preston | A rating |
| ZPMC UK Limited | Liverpool | A rating |
| ZR TRANSPORT SERVICES LTD | Hounslow | A rating |
| ZRG Partners UK Ltd | London | A rating |
| ZRKS TRADING LTD | Manchester | A rating |
| ZRZ LTD | Preston | A rating |
| ZS Associates International Inc. | London | A rating |
| ZS DELIVERY SERVICES LTD | Luton | A rating |
| ZS Latest Tech Ltd T/A Royton Phones | Oldham | A rating |
| ZS PHARMA LIMITED | LEICESTER | A rating |
| ZS TECH LAB LTD | Birmingham | A rating |
| ZS Trading Enterprises LTD T/A Bubbleology | London | A rating |
| ZSA TRADERS LTD | West Midlands | A rating |
| ZSAK MARYHILL LTD | Glasgow | A rating |
| Zscaler UK Ltd | London | A rating |
| ZSH LIMITED | Stockport | A rating |
| ZSHY LIMITED | London | A rating |
| Zsid Ltd | Falkirk | A rating |
| ZSK ENTERPRISE LTD | NEWCASTLE | A rating |
| ZSK LONDON LIMITED | Essex | A rating |
| ZSK ORGANIC LAND LTD | Cambridge | A rating |
| ZSRA LIMITED | WELLINGBOROUGH | A rating |
| ZSS Facility Ltd | LEEDS | A rating |
| ZT REPAIR AND MAINTANANCE LIMITED | London | A rating |
| ZTE (UK) LIMITED | Slough | A rating |
| Ztex Ltd | Ashford | A rating |
| ZTL LTD | Bournemouth | A rating |
| Ztos Business Care Limited | London | A rating |
| ZTW Healthcare Ltd T/as Herts Homecare | Hemel Hempstead | A rating |
| Zu's Restaurant Ltd t/a ZU'S EAT | Lonon | A rating |
| ZUB & BROTHER'S COMPANY LTD | Leigh | A rating |
| Zuba Technologies | London | A rating |
| Zubair Qureshi t/a Z A Builders | BLACKBURN | A rating |
| ZUBER ADAM PATEL T/A WELFORD CHIPPY (SOLE TRADER) | Leicester | A rating |
| ZUBI MALIK LIMITED | Gloucester | A rating |
| Zubway Ltd | Bolton | A rating |
| Zucchetti UK Limited | Keynsham | A rating |
| ZUCI SYSTEMS UK LIMITED | London | A rating |
| Zudek International Limited | London | A rating |
| ZUDIIOCLUB LIMITED | Birmingham | A rating |
| ZUF DENTAL CARE LIMITED | 862-864 Washwood Heath Road | A rating |
| Zufa Ltd. | Northwood hills | A rating |
| Zuffa UK Limited | London | A rating |
| Zuhayr Consultancy Limited T/A Cyberpeers | London | A rating |
| Zuhlke Engineering Ltd | London | A rating |
| Zuish Medical Services Ltd | Chigwell | A rating |
| Zuken Group Limited | Bristol | A rating |
| ZUKER PROPERTY LTD | LONDON | A rating |
| Zula Burger Limited | London | A rating |
| Zulfiquar Ali Murtaza t/a Capital Wholesalers | Edinburgh | A rating |
| Zulu Group Ltd | Borehamwood | A rating |
| ZULUS DUNDEE LTD | Dundee | A rating |
| Zuma Array Limited | London | A rating |
| Zuma Labs Limited | London | A rating |
| ZUMAR HALAL MEAT LTD | Woking | A rating |
| ZUMI MARKET LIMITED | LIVERPOOL | A rating |
| ZUMURUDA INVESTMENTS LTD | London | UK Expansion Worker: Provisional |
| ZUMZ Auto Limited | Glasgow | A rating |
| Zung Leon UK Company Limited | London | A rating |
| Zunoma Ltd | Eastbourne | A rating |
| Zuora UK Limited | London | A rating |
| ZUPLEX LTD | London | A rating |
| Zure Solutions UK Limited | York | A rating |
| Zurich Insurance Group | Swindon | A rating |
| ZURU UK Limited | Leeds | A rating |
| ZUSTECH LIMITED | London | A rating |
| Zutec Inc. (UK) Limited | London | A rating |
| ZUZ LTD | Wirral | A rating |
| Zuzana Glow Limited | London | A rating |
| ZV UK LIMITED | London | A rating |
| ZVC UK Ltd | London | A rating |
| ZVF PHARMA LTD | Slough | A rating |
| Zvilo Limited | London | A rating |
| Zwift UK Limited | London | A rating |
| Zxtech Ltd | London | A rating |
| Zyan Consultancy Limited | London | A rating |
| Zycus Infotech Private Limited | Harrow | A rating |
| Zydex Technologies Limited | London | A rating |
| ZYKA BOUTIQUE INDIAN RESTAURANT LTD | HEXHAM | A rating |
| ZYMALS CATERING LTD | BIRMINGHAM | A rating |
| Zynct Ltd | Brentwood | A rating |
| Zynd Limited | Leeds | A rating |
| Zynk Design Limited | Sunninghill | A rating |
| Zynx Technologies Limited | Hounslow | A rating |
| Zype TV Limited | Wokingham | A rating |
| ZyXEL Communications UK Ltd | Wokingham | A rating |
| ZZ Management Ltd. | Wales | A rating |
| ZZA CONSULTING LIMITED | LONDON | A rating |
| ZZIY Ltd | High Wycombe | A rating |
| ZZN STUDIO LTD | LONDON | A rating |
| Zzoomm Plc | Oxford | A rating |
| ZZZ Limited | London | A rating |