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Kieran O'Neill

Kieran O'Neill

Serial entrepreneur, AI product leader, and venture capital principal

London, England, United Kingdom
Joined August 2024

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7.2K connections
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Retail Brand Executives
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Software Engineering Leads
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Data AI Specialists
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M&S Digital Data

Summary

Kieran O'Neill is a highly experienced serial entrepreneur, having founded multiple successful companies that have scaled to millions of users. His ventures include Holy Lemon (a video sharing platform sold for $1.25M), Playfire (a gaming social network acquired by Green Man Gaming), and Thread (an AI-powered personal styling service acquired by Marks & Spencer). He demonstrates a strong drive to build and innovate, often challenging the status quo to create unique solutions. wikipedia+3
With a background in finance and accounting, including experience at KPMG, Goldman Sachs, and Macquarie Bank, Kieran possesses strong analytical skills. This financial acumen, combined with his extensive startup experience, makes him a valuable Principal at Tidal Ventures, where he now invests in and mentors early-stage companies. He emphasizes the importance of unit economics, hiring slow and firing fast, and understanding customers. tidalvc+1
Kieran O'Neill is deeply interested in artificial intelligence, leveraging it in his past venture Thread for personalized styling and currently focusing on Personalisation/Consumer AI at Marks & Spencer. His recent online activity and insights also reflect a keen interest in the future of AI, its applications in various industries, and the implications of emerging technologies like quantum computing and humanoid robots. nitter+1
Kieran maintains a strong life philosophy centered on mindfulness, meditation, and balancing work with personal life. He values spending time with family and friends, exploring the world, and being present in each moment. He believes in fostering open and transparent company cultures and highlights the resilience required to navigate the challenges of entrepreneurship. nitter+2

Work

Education

Projects

Hobbies

Enjoys exploring and traveling the world with friends and family. wired

Practices daily meditation to prioritize tasks and maintain focus, also uses commute time to listen to podcasts for learning. wired

Notes

BIBayo Ibirogbasaid they've seen
KOKieran O'Neill
make a big positive impact while working at a fashion brand.

Mar 28, 2026

JNJohn Ndegesaid
KOKieran O'Neill
is one of the most impressive founders they know in the clothing industry.

Jan 13, 2026