Rigorous process. Unconventional perspective.
GreyBourne Capital Management is a London-based discretionary hedge fund manager. We invest across global macro, long / short equity, and special situations on behalf of qualified institutional and private-principal partners.
We begin where consensus ends. Our process is grounded in fundamental research, disciplined risk management, and a willingness to hold positions long enough to be right.
Every opportunity is approached with the same rigour: macroeconomic context, company-level diligence, structural trend analysis, and a clear view of where the market is mispricing risk. We do not trade noise; we invest in signal.
The name is a statement of method. Grey— the colour of considered judgment, of nuance over certainty, of the deliberate pause before action. Bourne— a watercourse: purposeful, directional, contained. Together, a measured momentum.
Preservation of capital is the discipline that enables growth. Every position is sized accordingly. Every relationship is entered with the expectation that both sides will hold it for the long term.
The principles that govern every decision.
- Intellectual HonestyComfortable with being wrong.
- Long-Term OrientationDecades, not quarters.
- Capital StewardshipPreservation enables growth.
- Unconventional ThinkingEdge lives at the margin.
- Transparent CommunicationNo surprises, ever.
- Decisive ConvictionAnalysis must lead to action.
The people behind the process.
Alexander Marsh
Founder & Chief Investment OfficerTwenty years across global macro at bulge-bracket and independent firms. Former managing director at a tier-one European asset manager. Oxford Economics, CFA Charterholder.
Sophia Castillo
Partner, Head of Equity ResearchFifteen years covering global equities with a focus on European and Asia-Pacific markets. Previously head of TMT research at a leading hedge fund. LSE, MSc Finance.
Richard Nkosi
Partner, Risk & Portfolio ConstructionQuantitative risk specialist with a background in derivatives structuring. Former head of risk at a sovereign wealth fund. Imperial College, PhD Mathematics.