24Haymarket focuses on growth equity and venture capital investments in the UK.

We invest aligned private capital to accelerate commercial success.

Why 24Haymarket?

Headquartered in London and with a regional office in Edinburgh, we are distinguished by the calibre and engagement of the 24Haymarket Investor Network. 

We follow a strict investment thesis with a focus on verticals in the nascent stages of high growth where we can leverage proprietary insight from our Investor Network.

We focus on investing in companies that have demonstrated initial commercial traction.

We adhere to an active investment philosophy with a right to a board seat in each investment we pursue combined with an involved post-investment model.

Key Facts


Years of collective entrepreneurial, investment and operational experience


Sophisticated, engaged private investors


Syndicate members' own capital invested


Initial investment with follow-on ambition and capacity


Lead investments


Average ownership

Our Values


Thousands of years of collective experience.


Direct financial commitment to each of our investments.


We aim to complete within 6 weeks of first conversation.


We seek to optimise each investment we make.

Key People

Paul Tselentis CEO and Board Member

Paul Tselentis Paul is a co-founder and CEO of 24Haymarket. He previously spent over ten years working in private equity at The Carlyle Group and CCMP Capital and in Investment Banking at Lehman Brothers. Paul has a BA (magna cum laude) in Economics from Harvard University.

Charlie Green Board Member

Charlie Green Charlie Green is a co- founder of 24Haymarket and a former Partner of Candover Partners Limited and Director of Morgan Grenfell and Deutsche Bank. He was a founder of the Private Equity Foundation, now Impetus, and is currently the chair of ThinkForward. Charlie read Law and Management Studies at Cambridge.

Jean-Lou Rihon Board Member

Jean-Lou Rihon Jean-Lou is a co-founder of 24Haymarket and a former partner of Silverfleet Capital. He has more than twenty years’ experience investing across specialty retail, leisure and business services. Having started his career in manufacturing and commercial banking, he moved to investment banking at SG Warburg. He holds a Bachelor’s degree in Financial and Commercial Sciences from ICHEC in Brussels.

Lindsay Dibden Board Member

Lindsay Dibden Lindsay is a co-founder of 24Haymarket and spent a 24-year career in private equity investment. He is a Founding Partner of HgCapital and established the healthcare investment practice in 1996, which he managed for 16 years. Lindsay read Aeronautical Engineering at Imperial College and is a Chartered Accountant.

Darryn Koster Head of Operations

Darryn Koster Darryn is Head of Operations at 24Haymarket, having joined in 2016. She previously spent over 20 years working in the TMT Sector in Banking, Consulting and Private Equity at CCMP Capital, Gresham LLP, Delta Partners Group and iTouch plc. She studied Public Relations.

Jamie Dunnett Investment Director

Jamie Dunnett Jamie is an Investment Director at 24Haymarket, having joined the firm in 2016. He previously spent five years at Deloitte in the Transaction Services team. Jamie is a graduate of Durham University.

Alexandra Brown Senior Associate

Alexandra Brown Alex is a Senior Associate at 24Haymarket, having joined permanently in 2022. She has experience in the healthcare sector and previously spent 4 years at Accenture. Alex has an MBA from London Business School.

James Campin Investment Executive

James Campin James joined 24Haymarket as an Investment Executive in 2021. He previously spent three years at Strategy8 (PwC) in the Deals Strategy team. James is a graduate of the London School of Economics.

The investment by 24Haymarket has been a catalyst for Wattbike, both strategically and operationally. 24Haymarket’s track record and know-how in working with businesses at our stage of development has been invaluable. The support, rigour and strategic direction are applied with the right balance and timing.
Richard Baker, CEO Wattbike

24Haymarket has supported our business over multiple years with more than just investment funds. The team at 24Haymarket are collegiate and supportive of their portfolio businesses. We greatly appreciate our relationship with 24Haymarket and believe that their approach is both rare and of high quality.
Jordan Shlosberg, CEO proSapient

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