Talking Billions with Bogumil Baranowski

David Diranko: Contrarian Cash Flows: The Data Scientist Who Became a Contrarian Investor

Jan 5, 2026
David Diranko, a 29-year-old mathematician and founder of Diranko Capital, shares his unique journey from data science to contrarian investing. He discusses how mathematical rigor shapes his investment strategies, focusing on probabilistic thinking and the value of small-cap European markets. David openly describes the benefits of publishing his research for community building while addressing the challenge of balancing transparency with proprietary insights. He delves into investing in predictable businesses facing temporary issues and the importance of cash flow in valuations.
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INSIGHT

Small Caps Create Isolated Mispricings

  • Small-cap stocks offer more isolated, idiosyncratic mispricings because businesses are simpler and exposures are narrow.
  • A concentrated, active portfolio can exploit these asymmetric opportunities if you do deep, independent research.
INSIGHT

Europe's Fragmentation Favors Stock Pickers

  • Europe's fragmentation and limited capital depth produce information asymmetries that favor patient, local stock pickers.
  • Differences in languages, regulation, and capital markets increase the chance of finding overlooked value.
ADVICE

Buy Companies With Temporary Problems

  • Look for companies cheap due to temporary problems rather than permanent damage.
  • Ask whether the issue is cyclical, company-specific, or structural before buying.
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