| YieldifyConversion Optimisation & Website Personalisation | Yieldify | Computer Software | London | | $1 - 10M |
| YUDU MediaDigital Publishing & Communication Software | YUDU | Publishing | London | | $1 - 10M |
| | Entertainment | London | England | $1 - 10M |
| YOTELAffordable Luxury Hotels | YOTEL | Hospitality | London | England | $10 - 50M |
| | Restaurants | London | | $10 - 50M |
| | Leisure, Travel & Tourism | London | | $10 - 50M |
| | Internet | London | England | $0 - 1M |
| YouMint MediaJoin and get free mobile recharge, send free SMS to any mobile in India - YouMint | Marketing and Advertising | London | | $0 - 1M |
| | Marketing and Advertising | London | | $10 - 50M |
| Yoga MattersYogamatters - Buy yoga mats, equipment & yoga clothes | Health, Wellness and Fitness | London | ON | $0 - 1M |
| | Entertainment | London | | $1 - 10M |
| Your.MDng-bind="PageTitle.title()"> | Health, Wellness and Fitness | London | England | $1 - 10M |
| | Retail | London | UK | |
| | Financial Services | London | | $10 - 50M |
| | Retail | London | | $0 - 1M |
| yol??yol?? creative | love transfer | Quality image transfer products for creative people! UK | Arts and Crafts | London | | $0 - 1M |
| | Nonprofit Organization Management | London | | $1 - 10M |
| | Apparel & Fashion | London | | > $1B |
| | Real Estate | London | ON | $10 - 50M |
| | Nonprofit Organization Management | London | | $1 - 10M |
| yReceiptsConnecting in-store customers to transactions | yReceipts | Internet | London | | $0 - 1M |
| | Marketing and Advertising | London | Greater London | $1 - 10M |
| Yuki'skitchenJapanese Cooking Classes/Lessons/Courses - Yuki's Kitchen | Food & Beverages | London | | $0 - 1M |
| Yo Ltd.YO!Company - Simon Woodroffe's Innovation Hub | | London | | |
| | Internet | London | London | $0 - 1M |
| | Health, Wellness and Fitness | London | | $0 - 1M |
| | Computer Software | London | | |
| | Media Production | London | | $0 - 1M |
| | Computer Software | London | Greater London | $1 - 10M |
| | Events Services | Edinburgh & London | | $0 - 1M |
| | Music | London | London | $0 - 1M |
| | Design | London | | $0 - 1M |
| | Accounting | London | ON | $0 - 1M |
| | Events Services | London | | |
| | Internet | london | | $0 - 1M |
| | Design | London | | $1 - 10M |
| | Computer Software | London | | $0 - 1M |
| | Staffing and Recruiting | London | | $10 - 50M |
| YOOBICYOOBIC - Mobile solution to improve in-store execution | Internet | London | London | $0 - 1M |
| | Marketing and Advertising | London | Greater London | $1 - 10M |
| | Information Technology and Services | London | | $1 - 10M |
| | Internet | London | | $0 - 1M |
| | Financial Services | London | | $0 - 1M |
| | Internet | London | | $0 - 1M |
| | Human Resources | London | | $10 - 50M |
| | Information Technology and Services | London | | $0 - 1M |
| | Hospital & Health Care | London | | $1 - 10M |
| | Marketing and Advertising | London | | $1 - 10M |
| | Staffing and Recruiting | London | | $10 - 50M |
| | Media Production | London | | $0 - 1M |
| | Computer Software | London | | |