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24Haymarket
24Haymarket is a London-based asset manager focused on early-stage and growth equity investments.
24Haymarket
24Haymarket is a London-based venture capital firm that invests in small and medium-sized companies. The firm has made 88 investments, including a Series A - III investment in Dragonfly AI on January 28, 2026. 24Haymarket has facilitated 12 portfolio exits, with Osprey Flight Solutions exiting on September 03, 2025.
General information
Firm type
Generalist
Year founded
—
AUM
Undisclosed
Location
Region
Europe
Country
United Kingdom
City
London
Corporate office
3rd & 4th Floor, 24 Haymarket, London SW1Y 4DG, United Kingdom
Additional offices
Edinburgh, United Kingdom
Principals
Paul Tselentis
CEO and Co-founder
Marek Gumienny
Founder member and Board Member
Simon Leefe
Co-founder
Lindsay Stuart
Co-founder
Charlie Green
Director
Sector focus
Frequently asked questions
Who runs investment decisions at 24Haymarket?
Paul Tselentis serves as CEO and co-founder. Marek Gumienny, Simon Leefe and Lindsay Stuart act as co-founders with board or investment involvement.
Does 24Haymarket participate in fund commitments or only direct deals?
The firm makes direct investments and has entered commitments alongside British Business Investments.
What investment stages does 24Haymarket typically target?
The firm covers seed, start-up, expansion and growth stages across venture and private equity opportunities.
Where does 24Haymarket maintain offices?
Headquarters sit at 24 Haymarket in London with a second office at 44 Charlotte Square in Edinburgh.
How is 24Haymarket related to ThinkForward?
Director Charlie Green chairs the ThinkForward charity, which operates separately from the investment company.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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